[PATCH v2 0/6] DRM OF graph clean-up

[PATCH v2 0/6] DRM OF graph clean-up

[Rob Herring]

I've been unhappy with the OF graph API for some time and decided to
do something about it. The problem is drivers have to do too much of the
graph parsing and walking themselves. This has led to the same pattern
duplicated over and over. This series adds 2 new helpers and adapts DRM
drivers to use them. It only adds one new graph helper, but reduces the
use of the others which I hope to remove at some point. But we're not
there yet.

I plan to apply patch #1 to the DT tree for v4.11. The rest I will respin
for 4.12 after -rc1 to avoid any cross tree dependencies.

The build coverage should be a bit better than v1. Testing appreciated. A
git branch is here[1].

Rob

[1] git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git of-graph-helpers

Rob Herring (6):
  of: introduce of_graph_get_remote_node
  drm: make of_drm_find_panel also depend on CONFIG_DRM_PANEL
  drm: of: introduce drm_of_find_panel_or_bridge
  drm: convert drivers to use of_graph_get_remote_node
  drm: convert drivers to use drm_of_find_panel_or_bridge
  drm: omap: use common OF graph helpers

 drivers/gpu/drm/arm/hdlcd_drv.c                  |  22 +----
 drivers/gpu/drm/arm/malidp_drv.c                 |  28 +------
 drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c |  64 +++-----------
 drivers/gpu/drm/bridge/adv7511/adv7533.c         |  12 +--
 drivers/gpu/drm/bridge/dumb-vga-dac.c            |  15 +---
 drivers/gpu/drm/bridge/nxp-ptn3460.c             |  16 +---
 drivers/gpu/drm/bridge/parade-ps8622.c           |  16 +---
 drivers/gpu/drm/bridge/tc358767.c                |  27 +-----
 drivers/gpu/drm/bridge/ti-tfp410.c               |  15 ++--
 drivers/gpu/drm/drm_of.c                         |  52 ++++++++++++
 drivers/gpu/drm/exynos/exynos_dp.c               |  35 +++-----
 drivers/gpu/drm/exynos/exynos_drm_dpi.c          |  16 +---
 drivers/gpu/drm/exynos/exynos_drm_dsi.c          |  13 +--
 drivers/gpu/drm/exynos/exynos_drm_mic.c          |  27 +-----
 drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c        |  49 ++++-------
 drivers/gpu/drm/hisilicon/kirin/dw_drm_dsi.c     |  27 +-----
 drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c  |  30 +------
 drivers/gpu/drm/imx/imx-ldb.c                    |  27 ++----
 drivers/gpu/drm/imx/parallel-display.c           |  36 +-------
 drivers/gpu/drm/mediatek/mtk_dpi.c               |  12 +--
 drivers/gpu/drm/mediatek/mtk_dsi.c               |  23 ++---
 drivers/gpu/drm/mediatek/mtk_hdmi.c              |  26 +-----
 drivers/gpu/drm/meson/meson_venc_cvbs.c          |  19 +----
 drivers/gpu/drm/msm/dsi/dsi_host.c               |   3 +-
 drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c          |  28 +------
 drivers/gpu/drm/mxsfb/mxsfb_out.c                |  36 ++------
 drivers/gpu/drm/omapdrm/dss/dpi.c                |   2 +-
 drivers/gpu/drm/omapdrm/dss/dsi.c                |   3 +-
 drivers/gpu/drm/omapdrm/dss/dss-of.c             | 102 +----------------------
 drivers/gpu/drm/omapdrm/dss/dss.c                |  61 +++-----------
 drivers/gpu/drm/omapdrm/dss/hdmi4.c              |   3 +-
 drivers/gpu/drm/omapdrm/dss/hdmi5.c              |   3 +-
 drivers/gpu/drm/omapdrm/dss/omapdss.h            |  11 ---
 drivers/gpu/drm/omapdrm/dss/sdi.c                |   2 +-
 drivers/gpu/drm/omapdrm/dss/venc.c               |   3 +-
 drivers/gpu/drm/rockchip/analogix_dp-rockchip.c  |  26 +-----
 drivers/gpu/drm/rockchip/rockchip_drm_drv.c      |  18 ++--
 drivers/gpu/drm/sun4i/sun4i_rgb.c                |  13 ++-
 drivers/gpu/drm/sun4i/sun4i_tcon.c               |  90 ++------------------
 drivers/gpu/drm/tilcdc/tilcdc_crtc.c             |  12 +--
 drivers/gpu/drm/tilcdc/tilcdc_external.c         |  68 ++-------------
 drivers/gpu/drm/vc4/vc4_dpi.c                    |  15 +---
 drivers/of/base.c                                |  37 ++++++++
 include/drm/drm_of.h                             |  13 +++
 include/drm/drm_panel.h                          |   2 +-
 include/linux/of_graph.h                         |   8 ++
 46 files changed, 280 insertions(+), 886 deletions(-)

--
2.10.1

[PATCH v2 0/6] DRM OF graph clean-up

[Rob Herring]

I've been unhappy with the OF graph API for some time and decided to
do something about it. The problem is drivers have to do too much of the
graph parsing and walking themselves. This has led to the same pattern
duplicated over and over. This series adds 2 new helpers and adapts DRM
drivers to use them. It only adds one new graph helper, but reduces the
use of the others which I hope to remove at some point. But we're not
there yet.

I plan to apply patch #1 to the DT tree for v4.11. The rest I will respin
for 4.12 after -rc1 to avoid any cross tree dependencies.

The build coverage should be a bit better than v1. Testing appreciated. A
git branch is here[1].

Rob

[1] git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git of-graph-helpers

Rob Herring (6):
  of: introduce of_graph_get_remote_node
  drm: make of_drm_find_panel also depend on CONFIG_DRM_PANEL
  drm: of: introduce drm_of_find_panel_or_bridge
  drm: convert drivers to use of_graph_get_remote_node
  drm: convert drivers to use drm_of_find_panel_or_bridge
  drm: omap: use common OF graph helpers

 drivers/gpu/drm/arm/hdlcd_drv.c                  |  22 +----
 drivers/gpu/drm/arm/malidp_drv.c                 |  28 +------
 drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c |  64 +++-----------
 drivers/gpu/drm/bridge/adv7511/adv7533.c         |  12 +--
 drivers/gpu/drm/bridge/dumb-vga-dac.c            |  15 +---
 drivers/gpu/drm/bridge/nxp-ptn3460.c             |  16 +---
 drivers/gpu/drm/bridge/parade-ps8622.c           |  16 +---
 drivers/gpu/drm/bridge/tc358767.c                |  27 +-----
 drivers/gpu/drm/bridge/ti-tfp410.c               |  15 ++--
 drivers/gpu/drm/drm_of.c                         |  52 ++++++++++++
 drivers/gpu/drm/exynos/exynos_dp.c               |  35 +++-----
 drivers/gpu/drm/exynos/exynos_drm_dpi.c          |  16 +---
 drivers/gpu/drm/exynos/exynos_drm_dsi.c          |  13 +--
 drivers/gpu/drm/exynos/exynos_drm_mic.c          |  27 +-----
 drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c        |  49 ++++-------
 drivers/gpu/drm/hisilicon/kirin/dw_drm_dsi.c     |  27 +-----
 drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c  |  30 +------
 drivers/gpu/drm/imx/imx-ldb.c                    |  27 ++----
 drivers/gpu/drm/imx/parallel-display.c           |  36 +-------
 drivers/gpu/drm/mediatek/mtk_dpi.c               |  12 +--
 drivers/gpu/drm/mediatek/mtk_dsi.c               |  23 ++---
 drivers/gpu/drm/mediatek/mtk_hdmi.c              |  26 +-----
 drivers/gpu/drm/meson/meson_venc_cvbs.c          |  19 +----
 drivers/gpu/drm/msm/dsi/dsi_host.c               |   3 +-
 drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c          |  28 +------
 drivers/gpu/drm/mxsfb/mxsfb_out.c                |  36 ++------
 drivers/gpu/drm/omapdrm/dss/dpi.c                |   2 +-
 drivers/gpu/drm/omapdrm/dss/dsi.c                |   3 +-
 drivers/gpu/drm/omapdrm/dss/dss-of.c             | 102 +----------------------
 drivers/gpu/drm/omapdrm/dss/dss.c                |  61 +++-----------
 drivers/gpu/drm/omapdrm/dss/hdmi4.c              |   3 +-
 drivers/gpu/drm/omapdrm/dss/hdmi5.c              |   3 +-
 drivers/gpu/drm/omapdrm/dss/omapdss.h            |  11 ---
 drivers/gpu/drm/omapdrm/dss/sdi.c                |   2 +-
 drivers/gpu/drm/omapdrm/dss/venc.c               |   3 +-
 drivers/gpu/drm/rockchip/analogix_dp-rockchip.c  |  26 +-----
 drivers/gpu/drm/rockchip/rockchip_drm_drv.c      |  18 ++--
 drivers/gpu/drm/sun4i/sun4i_rgb.c                |  13 ++-
 drivers/gpu/drm/sun4i/sun4i_tcon.c               |  90 ++------------------
 drivers/gpu/drm/tilcdc/tilcdc_crtc.c             |  12 +--
 drivers/gpu/drm/tilcdc/tilcdc_external.c         |  68 ++-------------
 drivers/gpu/drm/vc4/vc4_dpi.c                    |  15 +---
 drivers/of/base.c                                |  37 ++++++++
 include/drm/drm_of.h                             |  13 +++
 include/drm/drm_panel.h                          |   2 +-
 include/linux/of_graph.h                         |   8 ++
 46 files changed, 280 insertions(+), 886 deletions(-)

--
2.10.1

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[PATCH v2 1/6] of: introduce of_graph_get_remote_node

[Rob Herring]

The OF graph API leaves too much of the graph walking to clients when
in many cases the driver doesn't care about accessing the port or
endpoint nodes. The drivers typically just want the device connected via
a particular graph connection. of_graph_get_remote_node provides this
functionality.

Signed-off-by: Rob Herring <robh@kernel.org>
Acked-by: Philipp Zabel <p.zabel@pengutronix.de>
---
v2:
- Fix of_node_put on endpoint node
- Added DocBook comments for function
- Made port/endpoint unsigned to disallow -1

 drivers/of/base.c        | 37 +++++++++++++++++++++++++++++++++++++
 include/linux/of_graph.h |  8 ++++++++
 2 files changed, 45 insertions(+)

diff --git a/drivers/of/base.c b/drivers/of/base.c
index d4bea3c797d6..525eb804f6ea 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -2469,3 +2469,40 @@ struct device_node *of_graph_get_remote_port(const struct device_node *node)
 	return of_get_next_parent(np);
 }
 EXPORT_SYMBOL(of_graph_get_remote_port);
+
+/**
+ * of_graph_get_remote_node() - get remote parent device_node for given port/endpoint
+ * @node: pointer to parent device_node containing graph port/endpoint
+ * @port: identifier (value of reg property) of the parent port node
+ * @endpoint: identifier (value of reg property) of the endpoint node
+ *
+ * Return: Remote device node associated with remote endpoint node linked
+ *	   to @node. Use of_node_put() on it when done.
+ */
+struct device_node *of_graph_get_remote_node(const struct device_node *node,
+					     u32 port, u32 endpoint)
+{
+	struct device_node *endpoint_node, *remote;
+
+	endpoint_node = of_graph_get_endpoint_by_regs(node, port, endpoint);
+	if (!endpoint_node) {
+		pr_debug("no valid endpoint (%d, %d) for node %s\n",
+			 port, endpoint, node->full_name);
+		return NULL;
+	}
+
+	remote = of_graph_get_remote_port_parent(endpoint_node);
+	of_node_put(endpoint_node);
+	if (!remote) {
+		pr_debug("no valid remote node\n");
+		return NULL;
+	}
+
+	if (!of_device_is_available(remote)) {
+		pr_debug("not available for remote node\n");
+		return NULL;
+	}
+
+	return remote;
+}
+EXPORT_SYMBOL(of_graph_get_remote_node);
diff --git a/include/linux/of_graph.h b/include/linux/of_graph.h
index bb3a5a2cd570..abdb02eaef06 100644
--- a/include/linux/of_graph.h
+++ b/include/linux/of_graph.h
@@ -51,6 +51,8 @@ struct device_node *of_graph_get_endpoint_by_regs(
 struct device_node *of_graph_get_remote_port_parent(
 					const struct device_node *node);
 struct device_node *of_graph_get_remote_port(const struct device_node *node);
+struct device_node *of_graph_get_remote_node(const struct device_node *node,
+					     u32 port, u32 endpoint);
 #else

 static inline int of_graph_parse_endpoint(const struct device_node *node,
@@ -89,6 +91,12 @@ static inline struct device_node *of_graph_get_remote_port(
 {
 	return NULL;
 }
+static inline struct device_node *of_graph_get_remote_node(
+					const struct device_node *node,
+					u32 port, u32 endpoint)
+{
+	return NULL;
+}

 #endif /* CONFIG_OF */

--
2.10.1

[PATCH v2 1/6] of: introduce of_graph_get_remote_node

[Rob Herring]

The OF graph API leaves too much of the graph walking to clients when
in many cases the driver doesn't care about accessing the port or
endpoint nodes. The drivers typically just want the device connected via
a particular graph connection. of_graph_get_remote_node provides this
functionality.

Signed-off-by: Rob Herring <robh@kernel.org>
Acked-by: Philipp Zabel <p.zabel@pengutronix.de>
---
v2:
- Fix of_node_put on endpoint node
- Added DocBook comments for function
- Made port/endpoint unsigned to disallow -1

 drivers/of/base.c        | 37 +++++++++++++++++++++++++++++++++++++
 include/linux/of_graph.h |  8 ++++++++
 2 files changed, 45 insertions(+)

diff --git a/drivers/of/base.c b/drivers/of/base.c
index d4bea3c797d6..525eb804f6ea 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -2469,3 +2469,40 @@ struct device_node *of_graph_get_remote_port(const struct device_node *node)
 	return of_get_next_parent(np);
 }
 EXPORT_SYMBOL(of_graph_get_remote_port);
+
+/**
+ * of_graph_get_remote_node() - get remote parent device_node for given port/endpoint
+ * @node: pointer to parent device_node containing graph port/endpoint
+ * @port: identifier (value of reg property) of the parent port node
+ * @endpoint: identifier (value of reg property) of the endpoint node
+ *
+ * Return: Remote device node associated with remote endpoint node linked
+ *	   to @node. Use of_node_put() on it when done.
+ */
+struct device_node *of_graph_get_remote_node(const struct device_node *node,
+					     u32 port, u32 endpoint)
+{
+	struct device_node *endpoint_node, *remote;
+
+	endpoint_node = of_graph_get_endpoint_by_regs(node, port, endpoint);
+	if (!endpoint_node) {
+		pr_debug("no valid endpoint (%d, %d) for node %s\n",
+			 port, endpoint, node->full_name);
+		return NULL;
+	}
+
+	remote = of_graph_get_remote_port_parent(endpoint_node);
+	of_node_put(endpoint_node);
+	if (!remote) {
+		pr_debug("no valid remote node\n");
+		return NULL;
+	}
+
+	if (!of_device_is_available(remote)) {
+		pr_debug("not available for remote node\n");
+		return NULL;
+	}
+
+	return remote;
+}
+EXPORT_SYMBOL(of_graph_get_remote_node);
diff --git a/include/linux/of_graph.h b/include/linux/of_graph.h
index bb3a5a2cd570..abdb02eaef06 100644
--- a/include/linux/of_graph.h
+++ b/include/linux/of_graph.h
@@ -51,6 +51,8 @@ struct device_node *of_graph_get_endpoint_by_regs(
 struct device_node *of_graph_get_remote_port_parent(
 					const struct device_node *node);
 struct device_node *of_graph_get_remote_port(const struct device_node *node);
+struct device_node *of_graph_get_remote_node(const struct device_node *node,
+					     u32 port, u32 endpoint);
 #else

 static inline int of_graph_parse_endpoint(const struct device_node *node,
@@ -89,6 +91,12 @@ static inline struct device_node *of_graph_get_remote_port(
 {
 	return NULL;
 }
+static inline struct device_node *of_graph_get_remote_node(
+					const struct device_node *node,
+					u32 port, u32 endpoint)
+{
+	return NULL;
+}

 #endif /* CONFIG_OF */

--
2.10.1

[PATCH v2 2/6] drm: make of_drm_find_panel also depend on CONFIG_DRM_PANEL

[Rob Herring]

For drm_of_find_panel_or_bridge() added in the next commit, an empty
version of of_drm_find_panel is needed for !CONFIG_DRM_PANEL.

Signed-off-by: Rob Herring <robh@kernel.org>
---
v2:
- new patch

 include/drm/drm_panel.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/drm/drm_panel.h b/include/drm/drm_panel.h
index 220d1e2b3db1..960b5fd5ed18 100644
--- a/include/drm/drm_panel.h
+++ b/include/drm/drm_panel.h
@@ -192,7 +192,7 @@ void drm_panel_remove(struct drm_panel *panel);
 int drm_panel_attach(struct drm_panel *panel, struct drm_connector *connector);
 int drm_panel_detach(struct drm_panel *panel);

-#ifdef CONFIG_OF
+#if defined(CONFIG_OF) && defined(CONFIG_DRM_PANEL)
 struct drm_panel *of_drm_find_panel(struct device_node *np);
 #else
 static inline struct drm_panel *of_drm_find_panel(struct device_node *np)
--
2.10.1

[PATCH v2 2/6] drm: make of_drm_find_panel also depend on CONFIG_DRM_PANEL

[Rob Herring]

For drm_of_find_panel_or_bridge() added in the next commit, an empty
version of of_drm_find_panel is needed for !CONFIG_DRM_PANEL.

Signed-off-by: Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
---
v2:
- new patch

 include/drm/drm_panel.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/drm/drm_panel.h b/include/drm/drm_panel.h
index 220d1e2b3db1..960b5fd5ed18 100644
--- a/include/drm/drm_panel.h
+++ b/include/drm/drm_panel.h
@@ -192,7 +192,7 @@ void drm_panel_remove(struct drm_panel *panel);
 int drm_panel_attach(struct drm_panel *panel, struct drm_connector *connector);
 int drm_panel_detach(struct drm_panel *panel);

-#ifdef CONFIG_OF
+#if defined(CONFIG_OF) && defined(CONFIG_DRM_PANEL)
 struct drm_panel *of_drm_find_panel(struct device_node *np);
 #else
 static inline struct drm_panel *of_drm_find_panel(struct device_node *np)
--
2.10.1

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[PATCH v2 3/6] drm: of: introduce drm_of_find_panel_or_bridge

[Rob Herring]

Many drivers have a common pattern of searching the OF graph for either an
attached panel or bridge and then finding the DRM struct for the panel
or bridge. Also, most drivers need to handle deferred probing when the
DRM device is not yet instantiated. Create a common function,
drm_of_find_panel_or_bridge, to find the connected node and the
associated DRM panel or bridge device.

Signed-off-by: Rob Herring <robh@kernel.org>
Acked-by: Philipp Zabel <p.zabel@pengutronix.de>
---
v2:
- Reworked code flow
- Added note that at least one of panel or bridge must not be NULL.

 drivers/gpu/drm/drm_of.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++++
 include/drm/drm_of.h     | 13 ++++++++++++
 2 files changed, 65 insertions(+)

diff --git a/drivers/gpu/drm/drm_of.c b/drivers/gpu/drm/drm_of.c
index 47848ed8ca48..86b8b959587a 100644
--- a/drivers/gpu/drm/drm_of.c
+++ b/drivers/gpu/drm/drm_of.c
@@ -3,7 +3,9 @@
 #include <linux/list.h>
 #include <linux/of_graph.h>
 #include <drm/drmP.h>
+#include <drm/drm_bridge.h>
 #include <drm/drm_crtc.h>
+#include <drm/drm_panel.h>
 #include <drm/drm_of.h>

 static void drm_release_of(struct device *dev, void *data)
@@ -207,3 +209,53 @@ int drm_of_encoder_active_endpoint(struct device_node *node,
 	return -EINVAL;
 }
 EXPORT_SYMBOL_GPL(drm_of_encoder_active_endpoint);
+
+/*
+ * drm_of_find_panel_or_bridge - return connected panel or bridge device
+ * @np: device tree node containing encoder input ports
+ * @panel: pointer to hold returned drm_panel
+ * @bridge: pointer to hold returned drm_bridge
+ *
+ * Given a DT node's port and endpoint number, find the connected node and
+ * return either the associated struct drm_panel or drm_bridge device. Either
+ * @panel or @bridge must not be NULL.
+ *
+ * Returns zero if successful, or one of the standard error codes if it fails.
+ */
+int drm_of_find_panel_or_bridge(const struct device_node *np,
+				int port, int endpoint,
+				struct drm_panel **panel,
+				struct drm_bridge **bridge)
+{
+	int ret = -EPROBE_DEFER;
+	struct device_node *remote;
+
+	if (!panel && !bridge)
+		return -EINVAL;
+
+	remote = of_graph_get_remote_node(np, port, endpoint);
+	if (!remote)
+		return -ENODEV;
+
+	if (panel) {
+		*panel = of_drm_find_panel(remote);
+		if (*panel)
+			ret = 0;
+	}
+
+	/* No panel found yet, check for a bridge next. */
+	if (bridge) {
+		if (ret) {
+			*bridge = of_drm_find_bridge(remote);
+			if (*bridge)
+				ret = 0;
+		} else {
+			*bridge = NULL;
+		}
+
+	}
+
+	of_node_put(remote);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(drm_of_find_panel_or_bridge);
diff --git a/include/drm/drm_of.h b/include/drm/drm_of.h
index 26a64805cc15..f86507f0599b 100644
--- a/include/drm/drm_of.h
+++ b/include/drm/drm_of.h
@@ -8,6 +8,8 @@ struct component_match;
 struct device;
 struct drm_device;
 struct drm_encoder;
+struct drm_panel;
+struct drm_bridge;
 struct device_node;

 #ifdef CONFIG_OF
@@ -23,6 +25,10 @@ extern int drm_of_component_probe(struct device *dev,
 extern int drm_of_encoder_active_endpoint(struct device_node *node,
 					  struct drm_encoder *encoder,
 					  struct of_endpoint *endpoint);
+extern int drm_of_find_panel_or_bridge(const struct device_node *np,
+				       int port, int endpoint,
+				       struct drm_panel **panel,
+				       struct drm_bridge **bridge);
 #else
 static inline uint32_t drm_of_find_possible_crtcs(struct drm_device *dev,
 						  struct device_node *port)
@@ -52,6 +58,13 @@ static inline int drm_of_encoder_active_endpoint(struct device_node *node,
 {
 	return -EINVAL;
 }
+static inline int drm_of_find_panel_or_bridge(const struct device_node *np,
+					      int port, int endpoint,
+					      struct drm_panel **panel,
+					      struct drm_bridge **bridge)
+{
+	return -EINVAL;
+}
 #endif

 static inline int drm_of_encoder_active_endpoint_id(struct device_node *node,
--
2.10.1

[PATCH v2 3/6] drm: of: introduce drm_of_find_panel_or_bridge

[Rob Herring]

Many drivers have a common pattern of searching the OF graph for either an
attached panel or bridge and then finding the DRM struct for the panel
or bridge. Also, most drivers need to handle deferred probing when the
DRM device is not yet instantiated. Create a common function,
drm_of_find_panel_or_bridge, to find the connected node and the
associated DRM panel or bridge device.

Signed-off-by: Rob Herring <robh@kernel.org>
Acked-by: Philipp Zabel <p.zabel@pengutronix.de>
---
v2:
- Reworked code flow
- Added note that at least one of panel or bridge must not be NULL.

 drivers/gpu/drm/drm_of.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++++
 include/drm/drm_of.h     | 13 ++++++++++++
 2 files changed, 65 insertions(+)

diff --git a/drivers/gpu/drm/drm_of.c b/drivers/gpu/drm/drm_of.c
index 47848ed8ca48..86b8b959587a 100644
--- a/drivers/gpu/drm/drm_of.c
+++ b/drivers/gpu/drm/drm_of.c
@@ -3,7 +3,9 @@
 #include <linux/list.h>
 #include <linux/of_graph.h>
 #include <drm/drmP.h>
+#include <drm/drm_bridge.h>
 #include <drm/drm_crtc.h>
+#include <drm/drm_panel.h>
 #include <drm/drm_of.h>

 static void drm_release_of(struct device *dev, void *data)
@@ -207,3 +209,53 @@ int drm_of_encoder_active_endpoint(struct device_node *node,
 	return -EINVAL;
 }
 EXPORT_SYMBOL_GPL(drm_of_encoder_active_endpoint);
+
+/*
+ * drm_of_find_panel_or_bridge - return connected panel or bridge device
+ * @np: device tree node containing encoder input ports
+ * @panel: pointer to hold returned drm_panel
+ * @bridge: pointer to hold returned drm_bridge
+ *
+ * Given a DT node's port and endpoint number, find the connected node and
+ * return either the associated struct drm_panel or drm_bridge device. Either
+ * @panel or @bridge must not be NULL.
+ *
+ * Returns zero if successful, or one of the standard error codes if it fails.
+ */
+int drm_of_find_panel_or_bridge(const struct device_node *np,
+				int port, int endpoint,
+				struct drm_panel **panel,
+				struct drm_bridge **bridge)
+{
+	int ret = -EPROBE_DEFER;
+	struct device_node *remote;
+
+	if (!panel && !bridge)
+		return -EINVAL;
+
+	remote = of_graph_get_remote_node(np, port, endpoint);
+	if (!remote)
+		return -ENODEV;
+
+	if (panel) {
+		*panel = of_drm_find_panel(remote);
+		if (*panel)
+			ret = 0;
+	}
+
+	/* No panel found yet, check for a bridge next. */
+	if (bridge) {
+		if (ret) {
+			*bridge = of_drm_find_bridge(remote);
+			if (*bridge)
+				ret = 0;
+		} else {
+			*bridge = NULL;
+		}
+
+	}
+
+	of_node_put(remote);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(drm_of_find_panel_or_bridge);
diff --git a/include/drm/drm_of.h b/include/drm/drm_of.h
index 26a64805cc15..f86507f0599b 100644
--- a/include/drm/drm_of.h
+++ b/include/drm/drm_of.h
@@ -8,6 +8,8 @@ struct component_match;
 struct device;
 struct drm_device;
 struct drm_encoder;
+struct drm_panel;
+struct drm_bridge;
 struct device_node;

 #ifdef CONFIG_OF
@@ -23,6 +25,10 @@ extern int drm_of_component_probe(struct device *dev,
 extern int drm_of_encoder_active_endpoint(struct device_node *node,
 					  struct drm_encoder *encoder,
 					  struct of_endpoint *endpoint);
+extern int drm_of_find_panel_or_bridge(const struct device_node *np,
+				       int port, int endpoint,
+				       struct drm_panel **panel,
+				       struct drm_bridge **bridge);
 #else
 static inline uint32_t drm_of_find_possible_crtcs(struct drm_device *dev,
 						  struct device_node *port)
@@ -52,6 +58,13 @@ static inline int drm_of_encoder_active_endpoint(struct device_node *node,
 {
 	return -EINVAL;
 }
+static inline int drm_of_find_panel_or_bridge(const struct device_node *np,
+					      int port, int endpoint,
+					      struct drm_panel **panel,
+					      struct drm_bridge **bridge)
+{
+	return -EINVAL;
+}
 #endif

 static inline int drm_of_encoder_active_endpoint_id(struct device_node *node,
--
2.10.1

[PATCH v2 4/6] drm: convert drivers to use of_graph_get_remote_node

[Rob Herring]

Convert drivers to use the new of_graph_get_remote_node() helper
instead of parsing the endpoint node and then getting the remote device
node. Now drivers can just specify the device node and which
port/endpoint and get back the connected remote device node. The details
of the graph binding are nicely abstracted into the core OF graph code.

This changes some error messages to debug messages (in the graph core).
Graph connections are often "no connects" depending on the particular
board, so we want to avoid spurious messages. Plus the kernel is not a
DT validator.

Signed-off-by: Rob Herring <robh@kernel.org>
Acked-by: Neil Armstrong <narmstrong@baylibre.com>
Acked-by: Philipp Zabel <p.zabel@pengutronix.de>
Tested-by: Liviu Dudau <liviu.dudau@arm.com>
Tested-by: Eric Anholt <eric@anholt.net>
---
v2:
- tilcdc fix (Jyri Sarha)
- Dropped an incomplete meson change.

 drivers/gpu/drm/arm/hdlcd_drv.c                 | 22 ++------
 drivers/gpu/drm/arm/malidp_drv.c                | 28 ++--------
 drivers/gpu/drm/bridge/adv7511/adv7533.c        | 12 +----
 drivers/gpu/drm/bridge/dumb-vga-dac.c           | 15 ++----
 drivers/gpu/drm/bridge/ti-tfp410.c              | 15 ++----
 drivers/gpu/drm/exynos/exynos_drm_dpi.c         | 16 +-----
 drivers/gpu/drm/exynos/exynos_drm_dsi.c         | 13 ++---
 drivers/gpu/drm/exynos/exynos_drm_mic.c         | 27 +---------
 drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c | 30 +----------
 drivers/gpu/drm/mediatek/mtk_dpi.c              | 12 ++---
 drivers/gpu/drm/mediatek/mtk_hdmi.c             | 26 ++--------
 drivers/gpu/drm/meson/meson_venc_cvbs.c         | 19 ++-----
 drivers/gpu/drm/msm/dsi/dsi_host.c              |  3 +-
 drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c         | 28 +---------
 drivers/gpu/drm/rockchip/rockchip_drm_drv.c     | 18 +++----
 drivers/gpu/drm/tilcdc/tilcdc_crtc.c            | 12 +----
 drivers/gpu/drm/tilcdc/tilcdc_external.c        | 68 +++----------------------
 drivers/gpu/drm/vc4/vc4_dpi.c                   | 15 ++----
 18 files changed, 55 insertions(+), 324 deletions(-)

diff --git a/drivers/gpu/drm/arm/hdlcd_drv.c b/drivers/gpu/drm/arm/hdlcd_drv.c
index e5f4f4a6546d..0f70f5fe9970 100644
--- a/drivers/gpu/drm/arm/hdlcd_drv.c
+++ b/drivers/gpu/drm/arm/hdlcd_drv.c
@@ -430,29 +430,13 @@ static int compare_dev(struct device *dev, void *data)

 static int hdlcd_probe(struct platform_device *pdev)
 {
-	struct device_node *port, *ep;
+	struct device_node *port;
 	struct component_match *match = NULL;

-	if (!pdev->dev.of_node)
-		return -ENODEV;
-
 	/* there is only one output port inside each device, find it */
-	ep = of_graph_get_next_endpoint(pdev->dev.of_node, NULL);
-	if (!ep)
-		return -ENODEV;
-
-	if (!of_device_is_available(ep)) {
-		of_node_put(ep);
+	port = of_graph_get_remote_node(pdev->dev.of_node, 0, 0);
+	if (!port)
 		return -ENODEV;
-	}
-
-	/* add the remote encoder port as component */
-	port = of_graph_get_remote_port_parent(ep);
-	of_node_put(ep);
-	if (!port || !of_device_is_available(port)) {
-		of_node_put(port);
-		return -EAGAIN;
-	}

 	drm_of_component_match_add(&pdev->dev, &match, compare_dev, port);
 	of_node_put(port);
diff --git a/drivers/gpu/drm/arm/malidp_drv.c b/drivers/gpu/drm/arm/malidp_drv.c
index 32f746e31379..47b552f1337c 100644
--- a/drivers/gpu/drm/arm/malidp_drv.c
+++ b/drivers/gpu/drm/arm/malidp_drv.c
@@ -262,7 +262,6 @@ static int malidp_bind(struct device *dev)
 {
 	struct resource *res;
 	struct drm_device *drm;
-	struct device_node *ep;
 	struct malidp_drm *malidp;
 	struct malidp_hw_device *hwdev;
 	struct platform_device *pdev = to_platform_device(dev);
@@ -360,12 +359,7 @@ static int malidp_bind(struct device *dev)
 		goto init_fail;

 	/* Set the CRTC's port so that the encoder component can find it */
-	ep = of_graph_get_next_endpoint(dev->of_node, NULL);
-	if (!ep) {
-		ret = -EINVAL;
-		goto port_fail;
-	}
-	malidp->crtc.port = of_get_next_parent(ep);
+	malidp->crtc.port = of_graph_get_port_by_id(dev->of_node, 0);

 	ret = component_bind_all(dev, drm);
 	if (ret) {
@@ -420,7 +414,6 @@ static int malidp_bind(struct device *dev)
 bind_fail:
 	of_node_put(malidp->crtc.port);
 	malidp->crtc.port = NULL;
-port_fail:
 	malidp_fini(drm);
 init_fail:
 	drm->dev_private = NULL;
@@ -478,29 +471,16 @@ static int malidp_compare_dev(struct device *dev, void *data)

 static int malidp_platform_probe(struct platform_device *pdev)
 {
-	struct device_node *port, *ep;
+	struct device_node *port;
 	struct component_match *match = NULL;

 	if (!pdev->dev.of_node)
 		return -ENODEV;

 	/* there is only one output port inside each device, find it */
-	ep = of_graph_get_next_endpoint(pdev->dev.of_node, NULL);
-	if (!ep)
-		return -ENODEV;
-
-	if (!of_device_is_available(ep)) {
-		of_node_put(ep);
+	port = of_graph_get_remote_node(pdev->dev.of_node, 0, 0);
+	if (!port)
 		return -ENODEV;
-	}
-
-	/* add the remote encoder port as component */
-	port = of_graph_get_remote_port_parent(ep);
-	of_node_put(ep);
-	if (!port || !of_device_is_available(port)) {
-		of_node_put(port);
-		return -EAGAIN;
-	}

 	drm_of_component_match_add(&pdev->dev, &match, malidp_compare_dev,
 				   port);
diff --git a/drivers/gpu/drm/bridge/adv7511/adv7533.c b/drivers/gpu/drm/bridge/adv7511/adv7533.c
index 8b210373cfa2..ac804f81e2f6 100644
--- a/drivers/gpu/drm/bridge/adv7511/adv7533.c
+++ b/drivers/gpu/drm/bridge/adv7511/adv7533.c
@@ -232,7 +232,6 @@ void adv7533_detach_dsi(struct adv7511 *adv)
 int adv7533_parse_dt(struct device_node *np, struct adv7511 *adv)
 {
 	u32 num_lanes;
-	struct device_node *endpoint;

 	of_property_read_u32(np, "adi,dsi-lanes", &num_lanes);

@@ -241,17 +240,10 @@ int adv7533_parse_dt(struct device_node *np, struct adv7511 *adv)

 	adv->num_dsi_lanes = num_lanes;

-	endpoint = of_graph_get_next_endpoint(np, NULL);
-	if (!endpoint)
+	adv->host_node = of_graph_get_remote_node(np, 0, 0);
+	if (!adv->host_node)
 		return -ENODEV;

-	adv->host_node = of_graph_get_remote_port_parent(endpoint);
-	if (!adv->host_node) {
-		of_node_put(endpoint);
-		return -ENODEV;
-	}
-
-	of_node_put(endpoint);
 	of_node_put(adv->host_node);

 	adv->use_timing_gen = !of_property_read_bool(np,
diff --git a/drivers/gpu/drm/bridge/dumb-vga-dac.c b/drivers/gpu/drm/bridge/dumb-vga-dac.c
index e5706981c934..47b4c99162ad 100644
--- a/drivers/gpu/drm/bridge/dumb-vga-dac.c
+++ b/drivers/gpu/drm/bridge/dumb-vga-dac.c
@@ -154,21 +154,12 @@ static const struct drm_bridge_funcs dumb_vga_bridge_funcs = {

 static struct i2c_adapter *dumb_vga_retrieve_ddc(struct device *dev)
 {
-	struct device_node *end_node, *phandle, *remote;
+	struct device_node *phandle, *remote;
 	struct i2c_adapter *ddc;

-	end_node = of_graph_get_endpoint_by_regs(dev->of_node, 1, -1);
-	if (!end_node) {
-		dev_err(dev, "Missing connector endpoint\n");
-		return ERR_PTR(-ENODEV);
-	}
-
-	remote = of_graph_get_remote_port_parent(end_node);
-	of_node_put(end_node);
-	if (!remote) {
-		dev_err(dev, "Enable to parse remote node\n");
+	remote = of_graph_get_remote_node(dev->of_node, 1, -1);
+	if (!remote)
 		return ERR_PTR(-EINVAL);
-	}

 	phandle = of_parse_phandle(remote, "ddc-i2c-bus", 0);
 	of_node_put(remote);
diff --git a/drivers/gpu/drm/bridge/ti-tfp410.c b/drivers/gpu/drm/bridge/ti-tfp410.c
index b054ea349952..82a6bdbf6ad0 100644
--- a/drivers/gpu/drm/bridge/ti-tfp410.c
+++ b/drivers/gpu/drm/bridge/ti-tfp410.c
@@ -127,18 +127,13 @@ static const struct drm_bridge_funcs tfp410_bridge_funcs = {

 static int tfp410_get_connector_ddc(struct tfp410 *dvi)
 {
-	struct device_node *ep = NULL, *connector_node = NULL;
-	struct device_node *ddc_phandle = NULL;
+	struct device_node *connector_node, *ddc_phandle;
 	int ret = 0;

 	/* port@1 is the connector node */
-	ep = of_graph_get_endpoint_by_regs(dvi->dev->of_node, 1, -1);
-	if (!ep)
-		goto fail;
-
-	connector_node = of_graph_get_remote_port_parent(ep);
+	connector_node = of_graph_get_remote_node(dvi->dev->of_node, 1, -1);
 	if (!connector_node)
-		goto fail;
+		return -ENODEV;

 	ddc_phandle = of_parse_phandle(connector_node, "ddc-i2c-bus", 0);
 	if (!ddc_phandle)
@@ -150,10 +145,10 @@ static int tfp410_get_connector_ddc(struct tfp410 *dvi)
 	else
 		ret = -EPROBE_DEFER;

+	of_node_put(ddc_phandle);
+
 fail:
-	of_node_put(ep);
 	of_node_put(connector_node);
-	of_node_put(ddc_phandle);
 	return ret;
 }

diff --git a/drivers/gpu/drm/exynos/exynos_drm_dpi.c b/drivers/gpu/drm/exynos/exynos_drm_dpi.c
index ad6b73c7fc59..eea529cea19a 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_dpi.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_dpi.c
@@ -164,27 +164,13 @@ enum {
 	FIMD_PORT_WRB,
 };

-static struct device_node *exynos_dpi_of_find_panel_node(struct device *dev)
-{
-	struct device_node *np, *ep;
-
-	ep = of_graph_get_endpoint_by_regs(dev->of_node, FIMD_PORT_RGB, 0);
-	if (!ep)
-		return NULL;
-
-	np = of_graph_get_remote_port_parent(ep);
-	of_node_put(ep);
-
-	return np;
-}
-
 static int exynos_dpi_parse_dt(struct exynos_dpi *ctx)
 {
 	struct device *dev = ctx->dev;
 	struct device_node *dn = dev->of_node;
 	struct device_node *np;

-	ctx->panel_node = exynos_dpi_of_find_panel_node(dev);
+	ctx->panel_node = of_graph_get_remote_node(dn, FIMD_PORT_RGB, 0);

 	np = of_get_child_by_name(dn, "display-timings");
 	if (np) {
diff --git a/drivers/gpu/drm/exynos/exynos_drm_dsi.c b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
index e07cb1fe4860..04528f512c91 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_dsi.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
@@ -1670,17 +1670,10 @@ static int exynos_dsi_parse_dt(struct exynos_dsi *dsi)

 	of_node_put(ep);

-	ep = of_graph_get_next_endpoint(node, NULL);
-	if (!ep) {
-		ret = -EINVAL;
-		goto end;
-	}
+	dsi->bridge_node = of_graph_get_remote_node(node, DSI_PORT_OUT, 0);
+	if (!dsi->bridge_node)
+		return -EINVAL;

-	dsi->bridge_node = of_graph_get_remote_port_parent(ep);
-	if (!dsi->bridge_node) {
-		ret = -EINVAL;
-		goto end;
-	}
 end:
 	of_node_put(ep);

diff --git a/drivers/gpu/drm/exynos/exynos_drm_mic.c b/drivers/gpu/drm/exynos/exynos_drm_mic.c
index a0def0be6d65..93ebb12133e1 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_mic.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_mic.c
@@ -228,29 +228,6 @@ static void mic_set_reg_on(struct exynos_mic *mic, bool enable)
 	writel(reg, mic->reg + MIC_OP);
 }

-static struct device_node *get_remote_node(struct device_node *from, int reg)
-{
-	struct device_node *endpoint = NULL, *remote_node = NULL;
-
-	endpoint = of_graph_get_endpoint_by_regs(from, reg, -1);
-	if (!endpoint) {
-		DRM_ERROR("mic: Failed to find remote port from %s",
-				from->full_name);
-		goto exit;
-	}
-
-	remote_node = of_graph_get_remote_port_parent(endpoint);
-	if (!remote_node) {
-		DRM_ERROR("mic: Failed to find remote port parent from %s",
-							from->full_name);
-		goto exit;
-	}
-
-exit:
-	of_node_put(endpoint);
-	return remote_node;
-}
-
 static int parse_dt(struct exynos_mic *mic)
 {
 	int ret = 0, i, j;
@@ -262,7 +239,7 @@ static int parse_dt(struct exynos_mic *mic)
 	 * The first node must be for decon and the second one must be for dsi.
 	 */
 	for (i = 0, j = 0; i < NUM_ENDPOINTS; i++) {
-		remote_node = get_remote_node(mic->dev->of_node, i);
+		remote_node = of_graph_get_remote_node(mic->dev->of_node, i, 0);
 		if (!remote_node) {
 			ret = -EPIPE;
 			goto exit;
@@ -279,7 +256,7 @@ static int parse_dt(struct exynos_mic *mic)
 			break;
 		case ENDPOINT_DSI_NODE:
 			/* panel node */
-			remote_node = get_remote_node(remote_node, 1);
+			remote_node = of_graph_get_remote_node(remote_node, 1, 0);
 			if (!remote_node) {
 				ret = -EPIPE;
 				goto exit;
diff --git a/drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c b/drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c
index ebd5f4fe4c23..18d6570e057d 100644
--- a/drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c
+++ b/drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c
@@ -247,34 +247,6 @@ static const struct component_master_ops kirin_drm_ops = {
 	.unbind = kirin_drm_unbind,
 };

-static struct device_node *kirin_get_remote_node(struct device_node *np)
-{
-	struct device_node *endpoint, *remote;
-
-	/* get the first endpoint, in our case only one remote node
-	 * is connected to display controller.
-	 */
-	endpoint = of_graph_get_next_endpoint(np, NULL);
-	if (!endpoint) {
-		DRM_ERROR("no valid endpoint node\n");
-		return ERR_PTR(-ENODEV);
-	}
-
-	remote = of_graph_get_remote_port_parent(endpoint);
-	of_node_put(endpoint);
-	if (!remote) {
-		DRM_ERROR("no valid remote node\n");
-		return ERR_PTR(-ENODEV);
-	}
-
-	if (!of_device_is_available(remote)) {
-		DRM_ERROR("not available for remote node\n");
-		return ERR_PTR(-ENODEV);
-	}
-
-	return remote;
-}
-
 static int kirin_drm_platform_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
@@ -288,7 +260,7 @@ static int kirin_drm_platform_probe(struct platform_device *pdev)
 		return -EINVAL;
 	}

-	remote = kirin_get_remote_node(np);
+	remote = of_graph_get_remote_node(np, 0, 0);
 	if (IS_ERR(remote))
 		return PTR_ERR(remote);

diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c b/drivers/gpu/drm/mediatek/mtk_dpi.c
index 90fb831ef031..dbd554c09a39 100644
--- a/drivers/gpu/drm/mediatek/mtk_dpi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
@@ -661,7 +661,7 @@ static int mtk_dpi_probe(struct platform_device *pdev)
 	struct device *dev = &pdev->dev;
 	struct mtk_dpi *dpi;
 	struct resource *mem;
-	struct device_node *ep, *bridge_node = NULL;
+	struct device_node *bridge_node;
 	int comp_id;
 	int ret;

@@ -706,15 +706,9 @@ static int mtk_dpi_probe(struct platform_device *pdev)
 		return -EINVAL;
 	}

-	ep = of_graph_get_next_endpoint(dev->of_node, NULL);
-	if (ep) {
-		bridge_node = of_graph_get_remote_port_parent(ep);
-		of_node_put(ep);
-	}
-	if (!bridge_node) {
-		dev_err(dev, "Failed to find bridge node\n");
+	bridge_node = of_graph_get_remote_node(dev->of_node, 0, 0);
+	if (!bridge_node)
 		return -ENODEV;
-	}

 	dev_info(dev, "Found bridge node: %s\n", bridge_node->full_name);

diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.c b/drivers/gpu/drm/mediatek/mtk_hdmi.c
index 0e8c4d9af340..f14e472812ce 100644
--- a/drivers/gpu/drm/mediatek/mtk_hdmi.c
+++ b/drivers/gpu/drm/mediatek/mtk_hdmi.c
@@ -1433,7 +1433,7 @@ static int mtk_hdmi_dt_parse_pdata(struct mtk_hdmi *hdmi,
 {
 	struct device *dev = &pdev->dev;
 	struct device_node *np = dev->of_node;
-	struct device_node *cec_np, *port, *ep, *remote, *i2c_np;
+	struct device_node *cec_np, *remote, *i2c_np;
 	struct platform_device *cec_pdev;
 	struct regmap *regmap;
 	struct resource *mem;
@@ -1485,29 +1485,9 @@ static int mtk_hdmi_dt_parse_pdata(struct mtk_hdmi *hdmi,
 	if (IS_ERR(hdmi->regs))
 		return PTR_ERR(hdmi->regs);

-	port = of_graph_get_port_by_id(np, 1);
-	if (!port) {
-		dev_err(dev, "Missing output port node\n");
+	remote = of_graph_get_remote_node(np, 1, 0);
+	if (!remote)
 		return -EINVAL;
-	}
-
-	ep = of_get_child_by_name(port, "endpoint");
-	if (!ep) {
-		dev_err(dev, "Missing endpoint node in port %s\n",
-			port->full_name);
-		of_node_put(port);
-		return -EINVAL;
-	}
-	of_node_put(port);
-
-	remote = of_graph_get_remote_port_parent(ep);
-	if (!remote) {
-		dev_err(dev, "Missing connector/bridge node for endpoint %s\n",
-			ep->full_name);
-		of_node_put(ep);
-		return -EINVAL;
-	}
-	of_node_put(ep);

 	if (!of_device_is_compatible(remote, "hdmi-connector")) {
 		hdmi->bridge.next = of_drm_find_bridge(remote);
diff --git a/drivers/gpu/drm/meson/meson_venc_cvbs.c b/drivers/gpu/drm/meson/meson_venc_cvbs.c
index a2bcc70a03ef..8566de2edb62 100644
--- a/drivers/gpu/drm/meson/meson_venc_cvbs.c
+++ b/drivers/gpu/drm/meson/meson_venc_cvbs.c
@@ -217,25 +217,14 @@ static const struct drm_encoder_helper_funcs

 static bool meson_venc_cvbs_connector_is_available(struct meson_drm *priv)
 {
-	struct device_node *ep, *remote;
+	struct device_node *remote;

-	/* CVBS VDAC output is on the first port, first endpoint */
-	ep = of_graph_get_endpoint_by_regs(priv->dev->of_node, 0, 0);
-	if (!ep)
+	remote = of_graph_get_remote_node(priv->dev->of_node, 0, 0);
+	if (!remote)
 		return false;

-
-	/* If the endpoint node exists, consider it enabled */
-	remote = of_graph_get_remote_port(ep);
-	if (remote) {
-		of_node_put(ep);
-		return true;
-	}
-
-	of_node_put(ep);
 	of_node_put(remote);
-
-	return false;
+	return true;
 }

 int meson_venc_cvbs_create(struct meson_drm *priv)
diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
index 3819fdefcae2..da8619f9eb2e 100644
--- a/drivers/gpu/drm/msm/dsi/dsi_host.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
@@ -1637,9 +1637,8 @@ static int dsi_host_parse_dt(struct msm_dsi_host *msm_host)
 	}

 	/* Get panel node from the output port's endpoint data */
-	device_node = of_graph_get_remote_port_parent(endpoint);
+	device_node = of_graph_get_remote_node(np, 1, 0);
 	if (!device_node) {
-		dev_err(dev, "%s: no valid device\n", __func__);
 		ret = -ENODEV;
 		goto err;
 	}
diff --git a/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c b/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c
index b782efd4b95f..9f36fad1915e 100644
--- a/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c
+++ b/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c
@@ -225,32 +225,6 @@ int mdp4_enable(struct mdp4_kms *mdp4_kms)
 	return 0;
 }

-static struct device_node *mdp4_detect_lcdc_panel(struct drm_device *dev)
-{
-	struct device_node *endpoint, *panel_node;
-	struct device_node *np = dev->dev->of_node;
-
-	/*
-	 * LVDS/LCDC is the first port described in the list of ports in the
-	 * MDP4 DT node.
-	 */
-	endpoint = of_graph_get_endpoint_by_regs(np, 0, -1);
-	if (!endpoint) {
-		DBG("no LVDS remote endpoint\n");
-		return NULL;
-	}
-
-	panel_node = of_graph_get_remote_port_parent(endpoint);
-	if (!panel_node) {
-		DBG("no valid panel node in LVDS endpoint\n");
-		of_node_put(endpoint);
-		return NULL;
-	}
-
-	of_node_put(endpoint);
-
-	return panel_node;
-}

 static int mdp4_modeset_init_intf(struct mdp4_kms *mdp4_kms,
 				  int intf_type)
@@ -270,7 +244,7 @@ static int mdp4_modeset_init_intf(struct mdp4_kms *mdp4_kms,
 		 * bail out early if there is no panel node (no need to
 		 * initialize LCDC encoder and LVDS connector)
 		 */
-		panel_node = mdp4_detect_lcdc_panel(dev);
+		panel_node = of_graph_get_remote_node(dev->dev->of_node, 0, 0);
 		if (!panel_node)
 			return 0;

diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
index 2390c8577617..5e7ccd04ada6 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
@@ -373,19 +373,13 @@ static void rockchip_add_endpoints(struct device *dev,
 				   struct component_match **match,
 				   struct device_node *port)
 {
-	struct device_node *ep, *remote;
+	struct device_node *remote;
+	int i;

-	for_each_child_of_node(port, ep) {
-		remote = of_graph_get_remote_port_parent(ep);
-		if (!remote || !of_device_is_available(remote)) {
-			of_node_put(remote);
-			continue;
-		} else if (!of_device_is_available(remote->parent)) {
-			dev_warn(dev, "parent device of %s is not available\n",
-				 remote->full_name);
-			of_node_put(remote);
+	for (i = 0; i < 3; i++) {
+		remote = of_graph_get_remote_node(port, 0, i);
+		if (!remote)
 			continue;
-		}

 		drm_of_component_match_add(dev, match, compare_of, remote);
 		of_node_put(remote);
@@ -464,7 +458,7 @@ static int rockchip_drm_platform_probe(struct platform_device *pdev)
 			continue;
 		}

-		rockchip_add_endpoints(dev, &match, port);
+		rockchip_add_endpoints(dev, &match, port->parent);
 		of_node_put(port);
 	}

diff --git a/drivers/gpu/drm/tilcdc/tilcdc_crtc.c b/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
index 6dfdb145f3bb..d67f39e850a8 100644
--- a/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
+++ b/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
@@ -23,6 +23,7 @@
 #include <linux/workqueue.h>
 #include <linux/completion.h>
 #include <linux/dma-mapping.h>
+#include <linux/of_graph.h>

 #include "tilcdc_drv.h"
 #include "tilcdc_regs.h"
@@ -1013,16 +1014,7 @@ int tilcdc_crtc_create(struct drm_device *dev)
 	drm_crtc_helper_add(crtc, &tilcdc_crtc_helper_funcs);

 	if (priv->is_componentized) {
-		struct device_node *ports =
-			of_get_child_by_name(dev->dev->of_node, "ports");
-
-		if (ports) {
-			crtc->port = of_get_child_by_name(ports, "port");
-			of_node_put(ports);
-		} else {
-			crtc->port =
-				of_get_child_by_name(dev->dev->of_node, "port");
-		}
+		crtc->port = of_graph_get_port_by_id(dev->dev->of_node, 0);
 		if (!crtc->port) { /* This should never happen */
 			dev_err(dev->dev, "Port node not found in %s\n",
 				dev->dev->of_node->full_name);
diff --git a/drivers/gpu/drm/tilcdc/tilcdc_external.c b/drivers/gpu/drm/tilcdc/tilcdc_external.c
index c67d7cd7d57e..19cf57a6ec76 100644
--- a/drivers/gpu/drm/tilcdc/tilcdc_external.c
+++ b/drivers/gpu/drm/tilcdc/tilcdc_external.c
@@ -187,39 +187,6 @@ int tilcdc_attach_bridge(struct drm_device *ddev, struct drm_bridge *bridge)
 	return ret;
 }

-static int tilcdc_node_has_port(struct device_node *dev_node)
-{
-	struct device_node *node;
-
-	node = of_get_child_by_name(dev_node, "ports");
-	if (!node)
-		node = of_get_child_by_name(dev_node, "port");
-	if (!node)
-		return 0;
-	of_node_put(node);
-
-	return 1;
-}
-
-static
-struct device_node *tilcdc_get_remote_node(struct device_node *node)
-{
-	struct device_node *ep;
-	struct device_node *parent;
-
-	if (!tilcdc_node_has_port(node))
-		return NULL;
-
-	ep = of_graph_get_next_endpoint(node, NULL);
-	if (!ep)
-		return NULL;
-
-	parent = of_graph_get_remote_port_parent(ep);
-	of_node_put(ep);
-
-	return parent;
-}
-
 int tilcdc_attach_external_device(struct drm_device *ddev)
 {
 	struct tilcdc_drm_private *priv = ddev->dev_private;
@@ -227,7 +194,7 @@ int tilcdc_attach_external_device(struct drm_device *ddev)
 	struct drm_bridge *bridge;
 	int ret;

-	remote_node = tilcdc_get_remote_node(ddev->dev->of_node);
+	remote_node = of_graph_get_remote_node(ddev->dev->of_node, 0, 0);
 	if (!remote_node)
 		return 0;

@@ -266,35 +233,16 @@ int tilcdc_get_external_components(struct device *dev,
 				   struct component_match **match)
 {
 	struct device_node *node;
-	struct device_node *ep = NULL;
-	int count = 0;
-	int ret = 0;
-
-	if (!tilcdc_node_has_port(dev->of_node))
-		return 0;

-	while ((ep = of_graph_get_next_endpoint(dev->of_node, ep))) {
-		node = of_graph_get_remote_port_parent(ep);
-		if (!node || !of_device_is_available(node)) {
-			of_node_put(node);
-			continue;
-		}
-
-		dev_dbg(dev, "Subdevice node '%s' found\n", node->name);
-
-		if (of_device_is_compatible(node, "nxp,tda998x")) {
-			if (match)
-				drm_of_component_match_add(dev, match,
-							   dev_match_of, node);
-			ret = 1;
-		}
+	node = of_graph_get_remote_node(dev->of_node, 0, 0);

+	if (!of_device_is_compatible(node, "nxp,tda998x")) {
 		of_node_put(node);
-		if (count++ > 1) {
-			dev_err(dev, "Only one port is supported\n");
-			return -EINVAL;
-		}
+		return 0;
 	}

-	return ret;
+	if (match)
+		drm_of_component_match_add(dev, match, dev_match_of, node);
+	of_node_put(node);
+	return 1;
 }
diff --git a/drivers/gpu/drm/vc4/vc4_dpi.c b/drivers/gpu/drm/vc4/vc4_dpi.c
index 1e1f6b8184d0..ac9655451b25 100644
--- a/drivers/gpu/drm/vc4/vc4_dpi.c
+++ b/drivers/gpu/drm/vc4/vc4_dpi.c
@@ -366,23 +366,14 @@ static const struct of_device_id vc4_dpi_dt_match[] = {
  */
 static struct drm_panel *vc4_dpi_get_panel(struct device *dev)
 {
-	struct device_node *endpoint, *panel_node;
+	struct device_node *panel_node;
 	struct device_node *np = dev->of_node;
 	struct drm_panel *panel;

-	endpoint = of_graph_get_next_endpoint(np, NULL);
-	if (!endpoint) {
-		dev_err(dev, "no endpoint to fetch DPI panel\n");
-		return NULL;
-	}
-
 	/* don't proceed if we have an endpoint but no panel_node tied to it */
-	panel_node = of_graph_get_remote_port_parent(endpoint);
-	of_node_put(endpoint);
-	if (!panel_node) {
-		dev_err(dev, "no valid panel node\n");
+	panel_node = of_graph_get_remote_node(np, 0, 0);
+	if (!panel_node)
 		return NULL;
-	}

 	panel = of_drm_find_panel(panel_node);
 	of_node_put(panel_node);
--
2.10.1

[PATCH v2 4/6] drm: convert drivers to use of_graph_get_remote_node

[Rob Herring]

Convert drivers to use the new of_graph_get_remote_node() helper
instead of parsing the endpoint node and then getting the remote device
node. Now drivers can just specify the device node and which
port/endpoint and get back the connected remote device node. The details
of the graph binding are nicely abstracted into the core OF graph code.

This changes some error messages to debug messages (in the graph core).
Graph connections are often "no connects" depending on the particular
board, so we want to avoid spurious messages. Plus the kernel is not a
DT validator.

Signed-off-by: Rob Herring <robh@kernel.org>
Acked-by: Neil Armstrong <narmstrong@baylibre.com>
Acked-by: Philipp Zabel <p.zabel@pengutronix.de>
Tested-by: Liviu Dudau <liviu.dudau@arm.com>
Tested-by: Eric Anholt <eric@anholt.net>
---
v2:
- tilcdc fix (Jyri Sarha)
- Dropped an incomplete meson change.

 drivers/gpu/drm/arm/hdlcd_drv.c                 | 22 ++------
 drivers/gpu/drm/arm/malidp_drv.c                | 28 ++--------
 drivers/gpu/drm/bridge/adv7511/adv7533.c        | 12 +----
 drivers/gpu/drm/bridge/dumb-vga-dac.c           | 15 ++----
 drivers/gpu/drm/bridge/ti-tfp410.c              | 15 ++----
 drivers/gpu/drm/exynos/exynos_drm_dpi.c         | 16 +-----
 drivers/gpu/drm/exynos/exynos_drm_dsi.c         | 13 ++---
 drivers/gpu/drm/exynos/exynos_drm_mic.c         | 27 +---------
 drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c | 30 +----------
 drivers/gpu/drm/mediatek/mtk_dpi.c              | 12 ++---
 drivers/gpu/drm/mediatek/mtk_hdmi.c             | 26 ++--------
 drivers/gpu/drm/meson/meson_venc_cvbs.c         | 19 ++-----
 drivers/gpu/drm/msm/dsi/dsi_host.c              |  3 +-
 drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c         | 28 +---------
 drivers/gpu/drm/rockchip/rockchip_drm_drv.c     | 18 +++----
 drivers/gpu/drm/tilcdc/tilcdc_crtc.c            | 12 +----
 drivers/gpu/drm/tilcdc/tilcdc_external.c        | 68 +++----------------------
 drivers/gpu/drm/vc4/vc4_dpi.c                   | 15 ++----
 18 files changed, 55 insertions(+), 324 deletions(-)

diff --git a/drivers/gpu/drm/arm/hdlcd_drv.c b/drivers/gpu/drm/arm/hdlcd_drv.c
index e5f4f4a6546d..0f70f5fe9970 100644
--- a/drivers/gpu/drm/arm/hdlcd_drv.c
+++ b/drivers/gpu/drm/arm/hdlcd_drv.c
@@ -430,29 +430,13 @@ static int compare_dev(struct device *dev, void *data)

 static int hdlcd_probe(struct platform_device *pdev)
 {
-	struct device_node *port, *ep;
+	struct device_node *port;
 	struct component_match *match = NULL;

-	if (!pdev->dev.of_node)
-		return -ENODEV;
-
 	/* there is only one output port inside each device, find it */
-	ep = of_graph_get_next_endpoint(pdev->dev.of_node, NULL);
-	if (!ep)
-		return -ENODEV;
-
-	if (!of_device_is_available(ep)) {
-		of_node_put(ep);
+	port = of_graph_get_remote_node(pdev->dev.of_node, 0, 0);
+	if (!port)
 		return -ENODEV;
-	}
-
-	/* add the remote encoder port as component */
-	port = of_graph_get_remote_port_parent(ep);
-	of_node_put(ep);
-	if (!port || !of_device_is_available(port)) {
-		of_node_put(port);
-		return -EAGAIN;
-	}

 	drm_of_component_match_add(&pdev->dev, &match, compare_dev, port);
 	of_node_put(port);
diff --git a/drivers/gpu/drm/arm/malidp_drv.c b/drivers/gpu/drm/arm/malidp_drv.c
index 32f746e31379..47b552f1337c 100644
--- a/drivers/gpu/drm/arm/malidp_drv.c
+++ b/drivers/gpu/drm/arm/malidp_drv.c
@@ -262,7 +262,6 @@ static int malidp_bind(struct device *dev)
 {
 	struct resource *res;
 	struct drm_device *drm;
-	struct device_node *ep;
 	struct malidp_drm *malidp;
 	struct malidp_hw_device *hwdev;
 	struct platform_device *pdev = to_platform_device(dev);
@@ -360,12 +359,7 @@ static int malidp_bind(struct device *dev)
 		goto init_fail;

 	/* Set the CRTC's port so that the encoder component can find it */
-	ep = of_graph_get_next_endpoint(dev->of_node, NULL);
-	if (!ep) {
-		ret = -EINVAL;
-		goto port_fail;
-	}
-	malidp->crtc.port = of_get_next_parent(ep);
+	malidp->crtc.port = of_graph_get_port_by_id(dev->of_node, 0);

 	ret = component_bind_all(dev, drm);
 	if (ret) {
@@ -420,7 +414,6 @@ static int malidp_bind(struct device *dev)
 bind_fail:
 	of_node_put(malidp->crtc.port);
 	malidp->crtc.port = NULL;
-port_fail:
 	malidp_fini(drm);
 init_fail:
 	drm->dev_private = NULL;
@@ -478,29 +471,16 @@ static int malidp_compare_dev(struct device *dev, void *data)

 static int malidp_platform_probe(struct platform_device *pdev)
 {
-	struct device_node *port, *ep;
+	struct device_node *port;
 	struct component_match *match = NULL;

 	if (!pdev->dev.of_node)
 		return -ENODEV;

 	/* there is only one output port inside each device, find it */
-	ep = of_graph_get_next_endpoint(pdev->dev.of_node, NULL);
-	if (!ep)
-		return -ENODEV;
-
-	if (!of_device_is_available(ep)) {
-		of_node_put(ep);
+	port = of_graph_get_remote_node(pdev->dev.of_node, 0, 0);
+	if (!port)
 		return -ENODEV;
-	}
-
-	/* add the remote encoder port as component */
-	port = of_graph_get_remote_port_parent(ep);
-	of_node_put(ep);
-	if (!port || !of_device_is_available(port)) {
-		of_node_put(port);
-		return -EAGAIN;
-	}

 	drm_of_component_match_add(&pdev->dev, &match, malidp_compare_dev,
 				   port);
diff --git a/drivers/gpu/drm/bridge/adv7511/adv7533.c b/drivers/gpu/drm/bridge/adv7511/adv7533.c
index 8b210373cfa2..ac804f81e2f6 100644
--- a/drivers/gpu/drm/bridge/adv7511/adv7533.c
+++ b/drivers/gpu/drm/bridge/adv7511/adv7533.c
@@ -232,7 +232,6 @@ void adv7533_detach_dsi(struct adv7511 *adv)
 int adv7533_parse_dt(struct device_node *np, struct adv7511 *adv)
 {
 	u32 num_lanes;
-	struct device_node *endpoint;

 	of_property_read_u32(np, "adi,dsi-lanes", &num_lanes);

@@ -241,17 +240,10 @@ int adv7533_parse_dt(struct device_node *np, struct adv7511 *adv)

 	adv->num_dsi_lanes = num_lanes;

-	endpoint = of_graph_get_next_endpoint(np, NULL);
-	if (!endpoint)
+	adv->host_node = of_graph_get_remote_node(np, 0, 0);
+	if (!adv->host_node)
 		return -ENODEV;

-	adv->host_node = of_graph_get_remote_port_parent(endpoint);
-	if (!adv->host_node) {
-		of_node_put(endpoint);
-		return -ENODEV;
-	}
-
-	of_node_put(endpoint);
 	of_node_put(adv->host_node);

 	adv->use_timing_gen = !of_property_read_bool(np,
diff --git a/drivers/gpu/drm/bridge/dumb-vga-dac.c b/drivers/gpu/drm/bridge/dumb-vga-dac.c
index e5706981c934..47b4c99162ad 100644
--- a/drivers/gpu/drm/bridge/dumb-vga-dac.c
+++ b/drivers/gpu/drm/bridge/dumb-vga-dac.c
@@ -154,21 +154,12 @@ static const struct drm_bridge_funcs dumb_vga_bridge_funcs = {

 static struct i2c_adapter *dumb_vga_retrieve_ddc(struct device *dev)
 {
-	struct device_node *end_node, *phandle, *remote;
+	struct device_node *phandle, *remote;
 	struct i2c_adapter *ddc;

-	end_node = of_graph_get_endpoint_by_regs(dev->of_node, 1, -1);
-	if (!end_node) {
-		dev_err(dev, "Missing connector endpoint\n");
-		return ERR_PTR(-ENODEV);
-	}
-
-	remote = of_graph_get_remote_port_parent(end_node);
-	of_node_put(end_node);
-	if (!remote) {
-		dev_err(dev, "Enable to parse remote node\n");
+	remote = of_graph_get_remote_node(dev->of_node, 1, -1);
+	if (!remote)
 		return ERR_PTR(-EINVAL);
-	}

 	phandle = of_parse_phandle(remote, "ddc-i2c-bus", 0);
 	of_node_put(remote);
diff --git a/drivers/gpu/drm/bridge/ti-tfp410.c b/drivers/gpu/drm/bridge/ti-tfp410.c
index b054ea349952..82a6bdbf6ad0 100644
--- a/drivers/gpu/drm/bridge/ti-tfp410.c
+++ b/drivers/gpu/drm/bridge/ti-tfp410.c
@@ -127,18 +127,13 @@ static const struct drm_bridge_funcs tfp410_bridge_funcs = {

 static int tfp410_get_connector_ddc(struct tfp410 *dvi)
 {
-	struct device_node *ep = NULL, *connector_node = NULL;
-	struct device_node *ddc_phandle = NULL;
+	struct device_node *connector_node, *ddc_phandle;
 	int ret = 0;

 	/* port@1 is the connector node */
-	ep = of_graph_get_endpoint_by_regs(dvi->dev->of_node, 1, -1);
-	if (!ep)
-		goto fail;
-
-	connector_node = of_graph_get_remote_port_parent(ep);
+	connector_node = of_graph_get_remote_node(dvi->dev->of_node, 1, -1);
 	if (!connector_node)
-		goto fail;
+		return -ENODEV;

 	ddc_phandle = of_parse_phandle(connector_node, "ddc-i2c-bus", 0);
 	if (!ddc_phandle)
@@ -150,10 +145,10 @@ static int tfp410_get_connector_ddc(struct tfp410 *dvi)
 	else
 		ret = -EPROBE_DEFER;

+	of_node_put(ddc_phandle);
+
 fail:
-	of_node_put(ep);
 	of_node_put(connector_node);
-	of_node_put(ddc_phandle);
 	return ret;
 }

diff --git a/drivers/gpu/drm/exynos/exynos_drm_dpi.c b/drivers/gpu/drm/exynos/exynos_drm_dpi.c
index ad6b73c7fc59..eea529cea19a 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_dpi.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_dpi.c
@@ -164,27 +164,13 @@ enum {
 	FIMD_PORT_WRB,
 };

-static struct device_node *exynos_dpi_of_find_panel_node(struct device *dev)
-{
-	struct device_node *np, *ep;
-
-	ep = of_graph_get_endpoint_by_regs(dev->of_node, FIMD_PORT_RGB, 0);
-	if (!ep)
-		return NULL;
-
-	np = of_graph_get_remote_port_parent(ep);
-	of_node_put(ep);
-
-	return np;
-}
-
 static int exynos_dpi_parse_dt(struct exynos_dpi *ctx)
 {
 	struct device *dev = ctx->dev;
 	struct device_node *dn = dev->of_node;
 	struct device_node *np;

-	ctx->panel_node = exynos_dpi_of_find_panel_node(dev);
+	ctx->panel_node = of_graph_get_remote_node(dn, FIMD_PORT_RGB, 0);

 	np = of_get_child_by_name(dn, "display-timings");
 	if (np) {
diff --git a/drivers/gpu/drm/exynos/exynos_drm_dsi.c b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
index e07cb1fe4860..04528f512c91 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_dsi.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
@@ -1670,17 +1670,10 @@ static int exynos_dsi_parse_dt(struct exynos_dsi *dsi)

 	of_node_put(ep);

-	ep = of_graph_get_next_endpoint(node, NULL);
-	if (!ep) {
-		ret = -EINVAL;
-		goto end;
-	}
+	dsi->bridge_node = of_graph_get_remote_node(node, DSI_PORT_OUT, 0);
+	if (!dsi->bridge_node)
+		return -EINVAL;

-	dsi->bridge_node = of_graph_get_remote_port_parent(ep);
-	if (!dsi->bridge_node) {
-		ret = -EINVAL;
-		goto end;
-	}
 end:
 	of_node_put(ep);

diff --git a/drivers/gpu/drm/exynos/exynos_drm_mic.c b/drivers/gpu/drm/exynos/exynos_drm_mic.c
index a0def0be6d65..93ebb12133e1 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_mic.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_mic.c
@@ -228,29 +228,6 @@ static void mic_set_reg_on(struct exynos_mic *mic, bool enable)
 	writel(reg, mic->reg + MIC_OP);
 }

-static struct device_node *get_remote_node(struct device_node *from, int reg)
-{
-	struct device_node *endpoint = NULL, *remote_node = NULL;
-
-	endpoint = of_graph_get_endpoint_by_regs(from, reg, -1);
-	if (!endpoint) {
-		DRM_ERROR("mic: Failed to find remote port from %s",
-				from->full_name);
-		goto exit;
-	}
-
-	remote_node = of_graph_get_remote_port_parent(endpoint);
-	if (!remote_node) {
-		DRM_ERROR("mic: Failed to find remote port parent from %s",
-							from->full_name);
-		goto exit;
-	}
-
-exit:
-	of_node_put(endpoint);
-	return remote_node;
-}
-
 static int parse_dt(struct exynos_mic *mic)
 {
 	int ret = 0, i, j;
@@ -262,7 +239,7 @@ static int parse_dt(struct exynos_mic *mic)
 	 * The first node must be for decon and the second one must be for dsi.
 	 */
 	for (i = 0, j = 0; i < NUM_ENDPOINTS; i++) {
-		remote_node = get_remote_node(mic->dev->of_node, i);
+		remote_node = of_graph_get_remote_node(mic->dev->of_node, i, 0);
 		if (!remote_node) {
 			ret = -EPIPE;
 			goto exit;
@@ -279,7 +256,7 @@ static int parse_dt(struct exynos_mic *mic)
 			break;
 		case ENDPOINT_DSI_NODE:
 			/* panel node */
-			remote_node = get_remote_node(remote_node, 1);
+			remote_node = of_graph_get_remote_node(remote_node, 1, 0);
 			if (!remote_node) {
 				ret = -EPIPE;
 				goto exit;
diff --git a/drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c b/drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c
index ebd5f4fe4c23..18d6570e057d 100644
--- a/drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c
+++ b/drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c
@@ -247,34 +247,6 @@ static const struct component_master_ops kirin_drm_ops = {
 	.unbind = kirin_drm_unbind,
 };

-static struct device_node *kirin_get_remote_node(struct device_node *np)
-{
-	struct device_node *endpoint, *remote;
-
-	/* get the first endpoint, in our case only one remote node
-	 * is connected to display controller.
-	 */
-	endpoint = of_graph_get_next_endpoint(np, NULL);
-	if (!endpoint) {
-		DRM_ERROR("no valid endpoint node\n");
-		return ERR_PTR(-ENODEV);
-	}
-
-	remote = of_graph_get_remote_port_parent(endpoint);
-	of_node_put(endpoint);
-	if (!remote) {
-		DRM_ERROR("no valid remote node\n");
-		return ERR_PTR(-ENODEV);
-	}
-
-	if (!of_device_is_available(remote)) {
-		DRM_ERROR("not available for remote node\n");
-		return ERR_PTR(-ENODEV);
-	}
-
-	return remote;
-}
-
 static int kirin_drm_platform_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
@@ -288,7 +260,7 @@ static int kirin_drm_platform_probe(struct platform_device *pdev)
 		return -EINVAL;
 	}

-	remote = kirin_get_remote_node(np);
+	remote = of_graph_get_remote_node(np, 0, 0);
 	if (IS_ERR(remote))
 		return PTR_ERR(remote);

diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c b/drivers/gpu/drm/mediatek/mtk_dpi.c
index 90fb831ef031..dbd554c09a39 100644
--- a/drivers/gpu/drm/mediatek/mtk_dpi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
@@ -661,7 +661,7 @@ static int mtk_dpi_probe(struct platform_device *pdev)
 	struct device *dev = &pdev->dev;
 	struct mtk_dpi *dpi;
 	struct resource *mem;
-	struct device_node *ep, *bridge_node = NULL;
+	struct device_node *bridge_node;
 	int comp_id;
 	int ret;

@@ -706,15 +706,9 @@ static int mtk_dpi_probe(struct platform_device *pdev)
 		return -EINVAL;
 	}

-	ep = of_graph_get_next_endpoint(dev->of_node, NULL);
-	if (ep) {
-		bridge_node = of_graph_get_remote_port_parent(ep);
-		of_node_put(ep);
-	}
-	if (!bridge_node) {
-		dev_err(dev, "Failed to find bridge node\n");
+	bridge_node = of_graph_get_remote_node(dev->of_node, 0, 0);
+	if (!bridge_node)
 		return -ENODEV;
-	}

 	dev_info(dev, "Found bridge node: %s\n", bridge_node->full_name);

diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.c b/drivers/gpu/drm/mediatek/mtk_hdmi.c
index 0e8c4d9af340..f14e472812ce 100644
--- a/drivers/gpu/drm/mediatek/mtk_hdmi.c
+++ b/drivers/gpu/drm/mediatek/mtk_hdmi.c
@@ -1433,7 +1433,7 @@ static int mtk_hdmi_dt_parse_pdata(struct mtk_hdmi *hdmi,
 {
 	struct device *dev = &pdev->dev;
 	struct device_node *np = dev->of_node;
-	struct device_node *cec_np, *port, *ep, *remote, *i2c_np;
+	struct device_node *cec_np, *remote, *i2c_np;
 	struct platform_device *cec_pdev;
 	struct regmap *regmap;
 	struct resource *mem;
@@ -1485,29 +1485,9 @@ static int mtk_hdmi_dt_parse_pdata(struct mtk_hdmi *hdmi,
 	if (IS_ERR(hdmi->regs))
 		return PTR_ERR(hdmi->regs);

-	port = of_graph_get_port_by_id(np, 1);
-	if (!port) {
-		dev_err(dev, "Missing output port node\n");
+	remote = of_graph_get_remote_node(np, 1, 0);
+	if (!remote)
 		return -EINVAL;
-	}
-
-	ep = of_get_child_by_name(port, "endpoint");
-	if (!ep) {
-		dev_err(dev, "Missing endpoint node in port %s\n",
-			port->full_name);
-		of_node_put(port);
-		return -EINVAL;
-	}
-	of_node_put(port);
-
-	remote = of_graph_get_remote_port_parent(ep);
-	if (!remote) {
-		dev_err(dev, "Missing connector/bridge node for endpoint %s\n",
-			ep->full_name);
-		of_node_put(ep);
-		return -EINVAL;
-	}
-	of_node_put(ep);

 	if (!of_device_is_compatible(remote, "hdmi-connector")) {
 		hdmi->bridge.next = of_drm_find_bridge(remote);
diff --git a/drivers/gpu/drm/meson/meson_venc_cvbs.c b/drivers/gpu/drm/meson/meson_venc_cvbs.c
index a2bcc70a03ef..8566de2edb62 100644
--- a/drivers/gpu/drm/meson/meson_venc_cvbs.c
+++ b/drivers/gpu/drm/meson/meson_venc_cvbs.c
@@ -217,25 +217,14 @@ static const struct drm_encoder_helper_funcs

 static bool meson_venc_cvbs_connector_is_available(struct meson_drm *priv)
 {
-	struct device_node *ep, *remote;
+	struct device_node *remote;

-	/* CVBS VDAC output is on the first port, first endpoint */
-	ep = of_graph_get_endpoint_by_regs(priv->dev->of_node, 0, 0);
-	if (!ep)
+	remote = of_graph_get_remote_node(priv->dev->of_node, 0, 0);
+	if (!remote)
 		return false;

-
-	/* If the endpoint node exists, consider it enabled */
-	remote = of_graph_get_remote_port(ep);
-	if (remote) {
-		of_node_put(ep);
-		return true;
-	}
-
-	of_node_put(ep);
 	of_node_put(remote);
-
-	return false;
+	return true;
 }

 int meson_venc_cvbs_create(struct meson_drm *priv)
diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
index 3819fdefcae2..da8619f9eb2e 100644
--- a/drivers/gpu/drm/msm/dsi/dsi_host.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
@@ -1637,9 +1637,8 @@ static int dsi_host_parse_dt(struct msm_dsi_host *msm_host)
 	}

 	/* Get panel node from the output port's endpoint data */
-	device_node = of_graph_get_remote_port_parent(endpoint);
+	device_node = of_graph_get_remote_node(np, 1, 0);
 	if (!device_node) {
-		dev_err(dev, "%s: no valid device\n", __func__);
 		ret = -ENODEV;
 		goto err;
 	}
diff --git a/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c b/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c
index b782efd4b95f..9f36fad1915e 100644
--- a/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c
+++ b/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c
@@ -225,32 +225,6 @@ int mdp4_enable(struct mdp4_kms *mdp4_kms)
 	return 0;
 }

-static struct device_node *mdp4_detect_lcdc_panel(struct drm_device *dev)
-{
-	struct device_node *endpoint, *panel_node;
-	struct device_node *np = dev->dev->of_node;
-
-	/*
-	 * LVDS/LCDC is the first port described in the list of ports in the
-	 * MDP4 DT node.
-	 */
-	endpoint = of_graph_get_endpoint_by_regs(np, 0, -1);
-	if (!endpoint) {
-		DBG("no LVDS remote endpoint\n");
-		return NULL;
-	}
-
-	panel_node = of_graph_get_remote_port_parent(endpoint);
-	if (!panel_node) {
-		DBG("no valid panel node in LVDS endpoint\n");
-		of_node_put(endpoint);
-		return NULL;
-	}
-
-	of_node_put(endpoint);
-
-	return panel_node;
-}

 static int mdp4_modeset_init_intf(struct mdp4_kms *mdp4_kms,
 				  int intf_type)
@@ -270,7 +244,7 @@ static int mdp4_modeset_init_intf(struct mdp4_kms *mdp4_kms,
 		 * bail out early if there is no panel node (no need to
 		 * initialize LCDC encoder and LVDS connector)
 		 */
-		panel_node = mdp4_detect_lcdc_panel(dev);
+		panel_node = of_graph_get_remote_node(dev->dev->of_node, 0, 0);
 		if (!panel_node)
 			return 0;

diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
index 2390c8577617..5e7ccd04ada6 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
@@ -373,19 +373,13 @@ static void rockchip_add_endpoints(struct device *dev,
 				   struct component_match **match,
 				   struct device_node *port)
 {
-	struct device_node *ep, *remote;
+	struct device_node *remote;
+	int i;

-	for_each_child_of_node(port, ep) {
-		remote = of_graph_get_remote_port_parent(ep);
-		if (!remote || !of_device_is_available(remote)) {
-			of_node_put(remote);
-			continue;
-		} else if (!of_device_is_available(remote->parent)) {
-			dev_warn(dev, "parent device of %s is not available\n",
-				 remote->full_name);
-			of_node_put(remote);
+	for (i = 0; i < 3; i++) {
+		remote = of_graph_get_remote_node(port, 0, i);
+		if (!remote)
 			continue;
-		}

 		drm_of_component_match_add(dev, match, compare_of, remote);
 		of_node_put(remote);
@@ -464,7 +458,7 @@ static int rockchip_drm_platform_probe(struct platform_device *pdev)
 			continue;
 		}

-		rockchip_add_endpoints(dev, &match, port);
+		rockchip_add_endpoints(dev, &match, port->parent);
 		of_node_put(port);
 	}

diff --git a/drivers/gpu/drm/tilcdc/tilcdc_crtc.c b/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
index 6dfdb145f3bb..d67f39e850a8 100644
--- a/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
+++ b/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
@@ -23,6 +23,7 @@
 #include <linux/workqueue.h>
 #include <linux/completion.h>
 #include <linux/dma-mapping.h>
+#include <linux/of_graph.h>

 #include "tilcdc_drv.h"
 #include "tilcdc_regs.h"
@@ -1013,16 +1014,7 @@ int tilcdc_crtc_create(struct drm_device *dev)
 	drm_crtc_helper_add(crtc, &tilcdc_crtc_helper_funcs);

 	if (priv->is_componentized) {
-		struct device_node *ports =
-			of_get_child_by_name(dev->dev->of_node, "ports");
-
-		if (ports) {
-			crtc->port = of_get_child_by_name(ports, "port");
-			of_node_put(ports);
-		} else {
-			crtc->port =
-				of_get_child_by_name(dev->dev->of_node, "port");
-		}
+		crtc->port = of_graph_get_port_by_id(dev->dev->of_node, 0);
 		if (!crtc->port) { /* This should never happen */
 			dev_err(dev->dev, "Port node not found in %s\n",
 				dev->dev->of_node->full_name);
diff --git a/drivers/gpu/drm/tilcdc/tilcdc_external.c b/drivers/gpu/drm/tilcdc/tilcdc_external.c
index c67d7cd7d57e..19cf57a6ec76 100644
--- a/drivers/gpu/drm/tilcdc/tilcdc_external.c
+++ b/drivers/gpu/drm/tilcdc/tilcdc_external.c
@@ -187,39 +187,6 @@ int tilcdc_attach_bridge(struct drm_device *ddev, struct drm_bridge *bridge)
 	return ret;
 }

-static int tilcdc_node_has_port(struct device_node *dev_node)
-{
-	struct device_node *node;
-
-	node = of_get_child_by_name(dev_node, "ports");
-	if (!node)
-		node = of_get_child_by_name(dev_node, "port");
-	if (!node)
-		return 0;
-	of_node_put(node);
-
-	return 1;
-}
-
-static
-struct device_node *tilcdc_get_remote_node(struct device_node *node)
-{
-	struct device_node *ep;
-	struct device_node *parent;
-
-	if (!tilcdc_node_has_port(node))
-		return NULL;
-
-	ep = of_graph_get_next_endpoint(node, NULL);
-	if (!ep)
-		return NULL;
-
-	parent = of_graph_get_remote_port_parent(ep);
-	of_node_put(ep);
-
-	return parent;
-}
-
 int tilcdc_attach_external_device(struct drm_device *ddev)
 {
 	struct tilcdc_drm_private *priv = ddev->dev_private;
@@ -227,7 +194,7 @@ int tilcdc_attach_external_device(struct drm_device *ddev)
 	struct drm_bridge *bridge;
 	int ret;

-	remote_node = tilcdc_get_remote_node(ddev->dev->of_node);
+	remote_node = of_graph_get_remote_node(ddev->dev->of_node, 0, 0);
 	if (!remote_node)
 		return 0;

@@ -266,35 +233,16 @@ int tilcdc_get_external_components(struct device *dev,
 				   struct component_match **match)
 {
 	struct device_node *node;
-	struct device_node *ep = NULL;
-	int count = 0;
-	int ret = 0;
-
-	if (!tilcdc_node_has_port(dev->of_node))
-		return 0;

-	while ((ep = of_graph_get_next_endpoint(dev->of_node, ep))) {
-		node = of_graph_get_remote_port_parent(ep);
-		if (!node || !of_device_is_available(node)) {
-			of_node_put(node);
-			continue;
-		}
-
-		dev_dbg(dev, "Subdevice node '%s' found\n", node->name);
-
-		if (of_device_is_compatible(node, "nxp,tda998x")) {
-			if (match)
-				drm_of_component_match_add(dev, match,
-							   dev_match_of, node);
-			ret = 1;
-		}
+	node = of_graph_get_remote_node(dev->of_node, 0, 0);

+	if (!of_device_is_compatible(node, "nxp,tda998x")) {
 		of_node_put(node);
-		if (count++ > 1) {
-			dev_err(dev, "Only one port is supported\n");
-			return -EINVAL;
-		}
+		return 0;
 	}

-	return ret;
+	if (match)
+		drm_of_component_match_add(dev, match, dev_match_of, node);
+	of_node_put(node);
+	return 1;
 }
diff --git a/drivers/gpu/drm/vc4/vc4_dpi.c b/drivers/gpu/drm/vc4/vc4_dpi.c
index 1e1f6b8184d0..ac9655451b25 100644
--- a/drivers/gpu/drm/vc4/vc4_dpi.c
+++ b/drivers/gpu/drm/vc4/vc4_dpi.c
@@ -366,23 +366,14 @@ static const struct of_device_id vc4_dpi_dt_match[] = {
  */
 static struct drm_panel *vc4_dpi_get_panel(struct device *dev)
 {
-	struct device_node *endpoint, *panel_node;
+	struct device_node *panel_node;
 	struct device_node *np = dev->of_node;
 	struct drm_panel *panel;

-	endpoint = of_graph_get_next_endpoint(np, NULL);
-	if (!endpoint) {
-		dev_err(dev, "no endpoint to fetch DPI panel\n");
-		return NULL;
-	}
-
 	/* don't proceed if we have an endpoint but no panel_node tied to it */
-	panel_node = of_graph_get_remote_port_parent(endpoint);
-	of_node_put(endpoint);
-	if (!panel_node) {
-		dev_err(dev, "no valid panel node\n");
+	panel_node = of_graph_get_remote_node(np, 0, 0);
+	if (!panel_node)
 		return NULL;
-	}

 	panel = of_drm_find_panel(panel_node);
 	of_node_put(panel_node);
--
2.10.1

[PATCH v2 5/6] drm: convert drivers to use drm_of_find_panel_or_bridge

[Rob Herring]

Similar to the previous commit, convert drivers open coding OF graph
parsing to use drm_of_find_panel_or_bridge instead.

This changes some error messages to debug messages (in the graph core).
Graph connections are often "no connects" depending on the particular
board, so we want to avoid spurious messages. Plus the kernel is not a
DT validator.

Signed-off-by: Rob Herring <robh@kernel.org>
---
v2:
- fix wrong node ptr in imx-ldb
- build fixes in kirin and imx drivers

 drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c | 64 ++++-------------
 drivers/gpu/drm/bridge/nxp-ptn3460.c             | 16 ++---
 drivers/gpu/drm/bridge/parade-ps8622.c           | 16 ++---
 drivers/gpu/drm/bridge/tc358767.c                | 27 +------
 drivers/gpu/drm/exynos/exynos_dp.c               | 35 ++++-----
 drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c        | 49 ++++---------
 drivers/gpu/drm/hisilicon/kirin/dw_drm_dsi.c     | 27 ++-----
 drivers/gpu/drm/imx/imx-ldb.c                    | 27 ++-----
 drivers/gpu/drm/imx/parallel-display.c           | 36 ++--------
 drivers/gpu/drm/mediatek/mtk_dsi.c               | 23 ++----
 drivers/gpu/drm/mxsfb/mxsfb_out.c                | 36 ++--------
 drivers/gpu/drm/rockchip/analogix_dp-rockchip.c  | 26 ++-----
 drivers/gpu/drm/sun4i/sun4i_rgb.c                | 13 ++--
 drivers/gpu/drm/sun4i/sun4i_tcon.c               | 90 ++----------------------
 14 files changed, 88 insertions(+), 397 deletions(-)

diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c
index 6119b5085501..4614048a4935 100644
--- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c
+++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c
@@ -22,7 +22,7 @@
 #include <linux/of_graph.h>

 #include <drm/drmP.h>
-#include <drm/drm_panel.h>
+#include <drm/drm_of.h>

 #include "atmel_hlcdc_dc.h"

@@ -152,29 +152,11 @@ static const struct drm_connector_funcs atmel_hlcdc_panel_connector_funcs = {
 	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 };

-static int atmel_hlcdc_check_endpoint(struct drm_device *dev,
-				      const struct of_endpoint *ep)
-{
-	struct device_node *np;
-	void *obj;
-
-	np = of_graph_get_remote_port_parent(ep->local_node);
-
-	obj = of_drm_find_panel(np);
-	if (!obj)
-		obj = of_drm_find_bridge(np);
-
-	of_node_put(np);
-
-	return obj ? 0 : -EPROBE_DEFER;
-}
-
 static int atmel_hlcdc_attach_endpoint(struct drm_device *dev,
-				       const struct of_endpoint *ep)
+				       const struct device_node *np)
 {
 	struct atmel_hlcdc_dc *dc = dev->dev_private;
 	struct atmel_hlcdc_rgb_output *output;
-	struct device_node *np;
 	struct drm_panel *panel;
 	struct drm_bridge *bridge;
 	int ret;
@@ -195,13 +177,11 @@ static int atmel_hlcdc_attach_endpoint(struct drm_device *dev,

 	output->encoder.possible_crtcs = 0x1;

-	np = of_graph_get_remote_port_parent(ep->local_node);
-
-	ret = -EPROBE_DEFER;
+	ret = drm_of_find_panel_or_bridge(np, 0, 0, &panel, &bridge);
+	if (ret)
+		return ret;

-	panel = of_drm_find_panel(np);
 	if (panel) {
-		of_node_put(np);
 		output->connector.dpms = DRM_MODE_DPMS_OFF;
 		output->connector.polled = DRM_CONNECTOR_POLL_CONNECT;
 		drm_connector_helper_add(&output->connector,
@@ -226,9 +206,6 @@ static int atmel_hlcdc_attach_endpoint(struct drm_device *dev,
 		return 0;
 	}

-	bridge = of_drm_find_bridge(np);
-	of_node_put(np);
-
 	if (bridge) {
 		output->encoder.bridge = bridge;
 		bridge->encoder = &output->encoder;
@@ -245,31 +222,14 @@ static int atmel_hlcdc_attach_endpoint(struct drm_device *dev,

 int atmel_hlcdc_create_outputs(struct drm_device *dev)
 {
-	struct device_node *ep_np = NULL;
-	struct of_endpoint ep;
+	struct device_node *remote;
 	int ret;

-	for_each_endpoint_of_node(dev->dev->of_node, ep_np) {
-		ret = of_graph_parse_endpoint(ep_np, &ep);
-		if (!ret)
-			ret = atmel_hlcdc_check_endpoint(dev, &ep);
-
-		if (ret) {
-			of_node_put(ep_np);
-			return ret;
-		}
-	}
-
-	for_each_endpoint_of_node(dev->dev->of_node, ep_np) {
-		ret = of_graph_parse_endpoint(ep_np, &ep);
-		if (!ret)
-			ret = atmel_hlcdc_attach_endpoint(dev, &ep);
-
-		if (ret) {
-			of_node_put(ep_np);
-			return ret;
-		}
-	}
+	remote = of_graph_get_remote_node(dev->dev->of_node, 0, 0);
+	if (!remote)
+		return -ENODEV;

-	return 0;
+	ret = atmel_hlcdc_attach_endpoint(dev, remote);
+	of_node_put(remote);
+	return ret;
 }
diff --git a/drivers/gpu/drm/bridge/nxp-ptn3460.c b/drivers/gpu/drm/bridge/nxp-ptn3460.c
index 27f98c518dde..351704390d02 100644
--- a/drivers/gpu/drm/bridge/nxp-ptn3460.c
+++ b/drivers/gpu/drm/bridge/nxp-ptn3460.c
@@ -20,8 +20,8 @@
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_gpio.h>
-#include <linux/of_graph.h>

+#include <drm/drm_of.h>
 #include <drm/drm_panel.h>

 #include "drm_crtc.h"
@@ -292,7 +292,6 @@ static int ptn3460_probe(struct i2c_client *client,
 {
 	struct device *dev = &client->dev;
 	struct ptn3460_bridge *ptn_bridge;
-	struct device_node *endpoint, *panel_node;
 	int ret;

 	ptn_bridge = devm_kzalloc(dev, sizeof(*ptn_bridge), GFP_KERNEL);
@@ -300,16 +299,9 @@ static int ptn3460_probe(struct i2c_client *client,
 		return -ENOMEM;
 	}

-	endpoint = of_graph_get_next_endpoint(dev->of_node, NULL);
-	if (endpoint) {
-		panel_node = of_graph_get_remote_port_parent(endpoint);
-		if (panel_node) {
-			ptn_bridge->panel = of_drm_find_panel(panel_node);
-			of_node_put(panel_node);
-			if (!ptn_bridge->panel)
-				return -EPROBE_DEFER;
-		}
-	}
+	ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &ptn_bridge->panel, NULL);
+	if (ret)
+		return ret;

 	ptn_bridge->client = client;

diff --git a/drivers/gpu/drm/bridge/parade-ps8622.c b/drivers/gpu/drm/bridge/parade-ps8622.c
index ac8cc5b50d9f..1dcec3b97e67 100644
--- a/drivers/gpu/drm/bridge/parade-ps8622.c
+++ b/drivers/gpu/drm/bridge/parade-ps8622.c
@@ -22,10 +22,10 @@
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
-#include <linux/of_graph.h>
 #include <linux/pm.h>
 #include <linux/regulator/consumer.h>

+#include <drm/drm_of.h>
 #include <drm/drm_panel.h>

 #include "drmP.h"
@@ -536,7 +536,6 @@ static int ps8622_probe(struct i2c_client *client,
 					const struct i2c_device_id *id)
 {
 	struct device *dev = &client->dev;
-	struct device_node *endpoint, *panel_node;
 	struct ps8622_bridge *ps8622;
 	int ret;

@@ -544,16 +543,9 @@ static int ps8622_probe(struct i2c_client *client,
 	if (!ps8622)
 		return -ENOMEM;

-	endpoint = of_graph_get_next_endpoint(dev->of_node, NULL);
-	if (endpoint) {
-		panel_node = of_graph_get_remote_port_parent(endpoint);
-		if (panel_node) {
-			ps8622->panel = of_drm_find_panel(panel_node);
-			of_node_put(panel_node);
-			if (!ps8622->panel)
-				return -EPROBE_DEFER;
-		}
-	}
+	ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &ps8622->panel, NULL);
+	if (ret)
+		return ret;

 	ps8622->client = client;

diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c
index de9ffb49e9f6..5c26488e7a2d 100644
--- a/drivers/gpu/drm/bridge/tc358767.c
+++ b/drivers/gpu/drm/bridge/tc358767.c
@@ -1244,7 +1244,6 @@ static const struct regmap_config tc_regmap_config = {
 static int tc_probe(struct i2c_client *client, const struct i2c_device_id *id)
 {
 	struct device *dev = &client->dev;
-	struct device_node *ep;
 	struct tc_data *tc;
 	int ret;

@@ -1255,29 +1254,9 @@ static int tc_probe(struct i2c_client *client, const struct i2c_device_id *id)
 	tc->dev = dev;

 	/* port@2 is the output port */
-	ep = of_graph_get_endpoint_by_regs(dev->of_node, 2, -1);
-	if (ep) {
-		struct device_node *remote;
-
-		remote = of_graph_get_remote_port_parent(ep);
-		if (!remote) {
-			dev_warn(dev, "endpoint %s not connected\n",
-				 ep->full_name);
-			of_node_put(ep);
-			return -ENODEV;
-		}
-		of_node_put(ep);
-		tc->panel = of_drm_find_panel(remote);
-		if (tc->panel) {
-			dev_dbg(dev, "found panel %s\n", remote->full_name);
-		} else {
-			dev_dbg(dev, "waiting for panel %s\n",
-				remote->full_name);
-			of_node_put(remote);
-			return -EPROBE_DEFER;
-		}
-		of_node_put(remote);
-	}
+	ret = drm_of_find_panel_or_bridge(dev->of_node, 2, 0, &tc->panel, NULL);
+	if (ret)
+		return ret;

 	/* Shut down GPIO is optional */
 	tc->sd_gpio = devm_gpiod_get_optional(dev, "shutdown", GPIOD_OUT_HIGH);
diff --git a/drivers/gpu/drm/exynos/exynos_dp.c b/drivers/gpu/drm/exynos/exynos_dp.c
index 528229faffe4..376c941c5189 100644
--- a/drivers/gpu/drm/exynos/exynos_dp.c
+++ b/drivers/gpu/drm/exynos/exynos_dp.c
@@ -23,6 +23,7 @@
 #include <drm/drmP.h>
 #include <drm/drm_crtc.h>
 #include <drm/drm_crtc_helper.h>
+#include <drm/drm_of.h>
 #include <drm/drm_panel.h>

 #include <drm/bridge/analogix_dp.h>
@@ -215,8 +216,11 @@ static const struct component_ops exynos_dp_ops = {
 static int exynos_dp_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
-	struct device_node *np = NULL, *endpoint = NULL;
+	struct device_node *np;
 	struct exynos_dp_device *dp;
+	struct drm_panel *panel;
+	struct drm_bridge *bridge;
+	int ret;

 	dp = devm_kzalloc(&pdev->dev, sizeof(struct exynos_dp_device),
 			  GFP_KERNEL);
@@ -240,28 +244,13 @@ static int exynos_dp_probe(struct platform_device *pdev)
 		goto out;
 	}

-	endpoint = of_graph_get_next_endpoint(dev->of_node, NULL);
-	if (endpoint) {
-		np = of_graph_get_remote_port_parent(endpoint);
-		if (np) {
-			/* The remote port can be either a panel or a bridge */
-			dp->plat_data.panel = of_drm_find_panel(np);
-			if (!dp->plat_data.panel) {
-				dp->ptn_bridge = of_drm_find_bridge(np);
-				if (!dp->ptn_bridge) {
-					of_node_put(np);
-					return -EPROBE_DEFER;
-				}
-			}
-			of_node_put(np);
-		} else {
-			DRM_ERROR("no remote endpoint device node found.\n");
-			return -EINVAL;
-		}
-	} else {
-		DRM_ERROR("no port endpoint subnode found.\n");
-		return -EINVAL;
-	}
+	ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &panel, &bridge);
+	if (ret)
+		return ret;
+
+	/* The remote port can be either a panel or a bridge */
+	dp->plat_data.panel = panel;
+	dp->ptn_bridge = bridge;

 out:
 	return component_add(&pdev->dev, &exynos_dp_ops);
diff --git a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c
index 05a8ee106879..3cae7dd75834 100644
--- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c
+++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c
@@ -15,6 +15,7 @@
 #include <drm/drmP.h>
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_crtc_helper.h>
+#include <drm/drm_of.h>
 #include <drm/drm_panel.h>

 #include "fsl_dcu_drm_drv.h"
@@ -141,35 +142,11 @@ static int fsl_dcu_attach_panel(struct fsl_dcu_drm_device *fsl_dev,
 	return ret;
 }

-static int fsl_dcu_attach_endpoint(struct fsl_dcu_drm_device *fsl_dev,
-				   const struct of_endpoint *ep)
-{
-	struct drm_bridge *bridge;
-	struct device_node *np;
-
-	np = of_graph_get_remote_port_parent(ep->local_node);
-
-	fsl_dev->connector.panel = of_drm_find_panel(np);
-	if (fsl_dev->connector.panel) {
-		of_node_put(np);
-		return fsl_dcu_attach_panel(fsl_dev, fsl_dev->connector.panel);
-	}
-
-	bridge = of_drm_find_bridge(np);
-	of_node_put(np);
-	if (!bridge)
-		return -ENODEV;
-
-	fsl_dev->encoder.bridge = bridge;
-	bridge->encoder = &fsl_dev->encoder;
-
-	return drm_bridge_attach(fsl_dev->drm, bridge);
-}
-
 int fsl_dcu_create_outputs(struct fsl_dcu_drm_device *fsl_dev)
 {
-	struct of_endpoint ep;
-	struct device_node *ep_node, *panel_node;
+	struct device_node *panel_node;
+	struct drm_bridge *bridge;
+	struct drm_panel *panel;
 	int ret;

 	/* This is for backward compatibility */
@@ -182,14 +159,16 @@ int fsl_dcu_create_outputs(struct fsl_dcu_drm_device *fsl_dev)
 		return fsl_dcu_attach_panel(fsl_dev, fsl_dev->connector.panel);
 	}

-	ep_node = of_graph_get_next_endpoint(fsl_dev->np, NULL);
-	if (!ep_node)
-		return -ENODEV;
-
-	ret = of_graph_parse_endpoint(ep_node, &ep);
-	of_node_put(ep_node);
+	ret = drm_of_find_panel_or_bridge(fsl_dev->np, 0, 0, &panel, &bridge);
 	if (ret)
-		return -ENODEV;
+		return ret;

-	return fsl_dcu_attach_endpoint(fsl_dev, &ep);
+	if (panel) {
+		fsl_dev->connector.panel = panel;
+		return fsl_dcu_attach_panel(fsl_dev, panel);
+	}
+
+	fsl_dev->encoder.bridge = bridge;
+	bridge->encoder = &fsl_dev->encoder;
+	return drm_bridge_attach(fsl_dev->drm, bridge);
 }
diff --git a/drivers/gpu/drm/hisilicon/kirin/dw_drm_dsi.c b/drivers/gpu/drm/hisilicon/kirin/dw_drm_dsi.c
index 998452ad0fcb..0f23e2c55862 100644
--- a/drivers/gpu/drm/hisilicon/kirin/dw_drm_dsi.c
+++ b/drivers/gpu/drm/hisilicon/kirin/dw_drm_dsi.c
@@ -17,7 +17,6 @@

 #include <linux/clk.h>
 #include <linux/component.h>
-#include <linux/of_graph.h>

 #include <drm/drm_of.h>
 #include <drm/drm_crtc_helper.h>
@@ -757,34 +756,16 @@ static int dsi_parse_dt(struct platform_device *pdev, struct dw_dsi *dsi)
 {
 	struct dsi_hw_ctx *ctx = dsi->ctx;
 	struct device_node *np = pdev->dev.of_node;
-	struct device_node *endpoint, *bridge_node;
-	struct drm_bridge *bridge;
 	struct resource *res;
+	int ret;

 	/*
 	 * Get the endpoint node. In our case, dsi has one output port1
 	 * to which the external HDMI bridge is connected.
 	 */
-	endpoint = of_graph_get_endpoint_by_regs(np, 1, -1);
-	if (!endpoint) {
-		DRM_ERROR("no valid endpoint node\n");
-		return -ENODEV;
-	}
-	of_node_put(endpoint);
-
-	bridge_node = of_graph_get_remote_port_parent(endpoint);
-	if (!bridge_node) {
-		DRM_ERROR("no valid bridge node\n");
-		return -ENODEV;
-	}
-	of_node_put(bridge_node);
-
-	bridge = of_drm_find_bridge(bridge_node);
-	if (!bridge) {
-		DRM_INFO("wait for external HDMI bridge driver.\n");
-		return -EPROBE_DEFER;
-	}
-	dsi->bridge = bridge;
+	ret = drm_of_find_panel_or_bridge(np, 0, 0, NULL, &dsi->bridge);
+	if (ret)
+		return ret;

 	ctx->pclk = devm_clk_get(&pdev->dev, "pclk");
 	if (IS_ERR(ctx->pclk)) {
diff --git a/drivers/gpu/drm/imx/imx-ldb.c b/drivers/gpu/drm/imx/imx-ldb.c
index 516d06490465..506d5c1d1263 100644
--- a/drivers/gpu/drm/imx/imx-ldb.c
+++ b/drivers/gpu/drm/imx/imx-ldb.c
@@ -649,7 +649,6 @@ static int imx_ldb_bind(struct device *dev, struct device *master, void *data)

 	for_each_child_of_node(np, child) {
 		struct imx_ldb_channel *channel;
-		struct device_node *ep;
 		int bus_format;

 		ret = of_property_read_u32(child, "reg", &i);
@@ -673,27 +672,11 @@ static int imx_ldb_bind(struct device *dev, struct device *master, void *data)
 		 * The output port is port@4 with an external 4-port mux or
 		 * port@2 with the internal 2-port mux.
 		 */
-		ep = of_graph_get_endpoint_by_regs(child,
-						   imx_ldb->lvds_mux ? 4 : 2,
-						   -1);
-		if (ep) {
-			struct device_node *remote;
-
-			remote = of_graph_get_remote_port_parent(ep);
-			of_node_put(ep);
-			if (remote) {
-				channel->panel = of_drm_find_panel(remote);
-				channel->bridge = of_drm_find_bridge(remote);
-			} else
-				return -EPROBE_DEFER;
-			of_node_put(remote);
-
-			if (!channel->panel && !channel->bridge) {
-				dev_err(dev, "panel/bridge not found: %s\n",
-					remote->full_name);
-				return -EPROBE_DEFER;
-			}
-		}
+		ret = drm_of_find_panel_or_bridge(child,
+						  imx_ldb->lvds_mux ? 4 : 2, 0,
+						  &channel->panel, &channel->bridge);
+		if (ret)
+			return ret;

 		/* panel ddc only if there is no bridge */
 		if (!channel->bridge) {
diff --git a/drivers/gpu/drm/imx/parallel-display.c b/drivers/gpu/drm/imx/parallel-display.c
index 8582a83c0d9b..92336f38c55e 100644
--- a/drivers/gpu/drm/imx/parallel-display.c
+++ b/drivers/gpu/drm/imx/parallel-display.c
@@ -19,10 +19,10 @@
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_fb_helper.h>
 #include <drm/drm_crtc_helper.h>
+#include <drm/drm_of.h>
 #include <drm/drm_panel.h>
 #include <linux/videodev2.h>
 #include <video/of_display_timing.h>
-#include <linux/of_graph.h>

 #include "imx-drm.h"

@@ -210,7 +210,6 @@ static int imx_pd_bind(struct device *dev, struct device *master, void *data)
 {
 	struct drm_device *drm = data;
 	struct device_node *np = dev->of_node;
-	struct device_node *ep;
 	const u8 *edidp;
 	struct imx_parallel_display *imxpd;
 	int ret;
@@ -239,36 +238,9 @@ static int imx_pd_bind(struct device *dev, struct device *master, void *data)
 	imxpd->bus_format = bus_format;

 	/* port@1 is the output port */
-	ep = of_graph_get_endpoint_by_regs(np, 1, -1);
-	if (ep) {
-		struct device_node *remote;
-
-		remote = of_graph_get_remote_port_parent(ep);
-		if (!remote) {
-			dev_warn(dev, "endpoint %s not connected\n",
-				 ep->full_name);
-			of_node_put(ep);
-			return -ENODEV;
-		}
-		of_node_put(ep);
-
-		imxpd->panel = of_drm_find_panel(remote);
-		if (imxpd->panel) {
-			dev_dbg(dev, "found panel %s\n", remote->full_name);
-		} else {
-			imxpd->bridge = of_drm_find_bridge(remote);
-			if (imxpd->bridge)
-				dev_dbg(dev, "found bridge %s\n",
-					remote->full_name);
-		}
-		if (!imxpd->panel && !imxpd->bridge) {
-			dev_dbg(dev, "waiting for panel or bridge %s\n",
-				remote->full_name);
-			of_node_put(remote);
-			return -EPROBE_DEFER;
-		}
-		of_node_put(remote);
-	}
+	ret = drm_of_find_panel_or_bridge(np, 1, 0, &imxpd->panel, &imxpd->bridge);
+	if (ret)
+		return ret;

 	imxpd->dev = dev;

diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
index 2c42f90809d8..14140579f8d4 100644
--- a/drivers/gpu/drm/mediatek/mtk_dsi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
@@ -16,11 +16,11 @@
 #include <drm/drm_crtc_helper.h>
 #include <drm/drm_mipi_dsi.h>
 #include <drm/drm_panel.h>
+#include <drm/drm_of.h>
 #include <linux/clk.h>
 #include <linux/component.h>
 #include <linux/of.h>
 #include <linux/of_platform.h>
-#include <linux/of_graph.h>
 #include <linux/phy/phy.h>
 #include <linux/platform_device.h>
 #include <video/videomode.h>
@@ -819,7 +819,6 @@ static int mtk_dsi_probe(struct platform_device *pdev)
 {
 	struct mtk_dsi *dsi;
 	struct device *dev = &pdev->dev;
-	struct device_node *remote_node, *endpoint;
 	struct resource *regs;
 	int comp_id;
 	int ret;
@@ -831,22 +830,10 @@ static int mtk_dsi_probe(struct platform_device *pdev)
 	dsi->host.ops = &mtk_dsi_ops;
 	dsi->host.dev = dev;

-	endpoint = of_graph_get_next_endpoint(dev->of_node, NULL);
-	if (endpoint) {
-		remote_node = of_graph_get_remote_port_parent(endpoint);
-		if (!remote_node) {
-			dev_err(dev, "No panel connected\n");
-			return -ENODEV;
-		}
-
-		dsi->bridge = of_drm_find_bridge(remote_node);
-		dsi->panel = of_drm_find_panel(remote_node);
-		of_node_put(remote_node);
-		if (!dsi->bridge && !dsi->panel) {
-			dev_info(dev, "Waiting for bridge or panel driver\n");
-			return -EPROBE_DEFER;
-		}
-	}
+	ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0,
+					  &dsi->panel, &dsi->bridge);
+	if (ret)
+		return ret;

 	dsi->engine_clk = devm_clk_get(dev, "engine");
 	if (IS_ERR(dsi->engine_clk)) {
diff --git a/drivers/gpu/drm/mxsfb/mxsfb_out.c b/drivers/gpu/drm/mxsfb/mxsfb_out.c
index fa8d17399407..f7d729aa09bd 100644
--- a/drivers/gpu/drm/mxsfb/mxsfb_out.c
+++ b/drivers/gpu/drm/mxsfb/mxsfb_out.c
@@ -19,6 +19,7 @@
 #include <drm/drm_crtc_helper.h>
 #include <drm/drm_fb_cma_helper.h>
 #include <drm/drm_gem_cma_helper.h>
+#include <drm/drm_of.h>
 #include <drm/drm_panel.h>
 #include <drm/drm_plane_helper.h>
 #include <drm/drm_simple_kms_helper.h>
@@ -82,20 +83,15 @@ static const struct drm_connector_funcs mxsfb_panel_connector_funcs = {
 	.atomic_destroy_state	= drm_atomic_helper_connector_destroy_state,
 };

-static int mxsfb_attach_endpoint(struct drm_device *drm,
-				 const struct of_endpoint *ep)
+int mxsfb_create_output(struct drm_device *drm)
 {
 	struct mxsfb_drm_private *mxsfb = drm->dev_private;
-	struct device_node *np;
 	struct drm_panel *panel;
-	int ret = -EPROBE_DEFER;
-
-	np = of_graph_get_remote_port_parent(ep->local_node);
-	panel = of_drm_find_panel(np);
-	of_node_put(np);
+	int ret;

-	if (!panel)
-		return -EPROBE_DEFER;
+	ret = drm_of_find_panel_or_bridge(drm->dev->of_node, 0, 0, &panel, NULL);
+	if (ret)
+		return ret;

 	mxsfb->connector.dpms = DRM_MODE_DPMS_OFF;
 	mxsfb->connector.polled = 0;
@@ -109,23 +105,3 @@ static int mxsfb_attach_endpoint(struct drm_device *drm,

 	return ret;
 }
-
-int mxsfb_create_output(struct drm_device *drm)
-{
-	struct device_node *ep_np = NULL;
-	struct of_endpoint ep;
-	int ret;
-
-	for_each_endpoint_of_node(drm->dev->of_node, ep_np) {
-		ret = of_graph_parse_endpoint(ep_np, &ep);
-		if (!ret)
-			ret = mxsfb_attach_endpoint(drm, &ep);
-
-		if (ret) {
-			of_node_put(ep_np);
-			return ret;
-		}
-	}
-
-	return 0;
-}
diff --git a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
index 8548e8271639..615afad280a8 100644
--- a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
+++ b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
@@ -428,31 +428,13 @@ static const struct component_ops rockchip_dp_component_ops = {
 static int rockchip_dp_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
-	struct device_node *panel_node, *port, *endpoint;
 	struct drm_panel *panel = NULL;
 	struct rockchip_dp_device *dp;
+	int ret;

-	port = of_graph_get_port_by_id(dev->of_node, 1);
-	if (port) {
-		endpoint = of_get_child_by_name(port, "endpoint");
-		of_node_put(port);
-		if (!endpoint) {
-			dev_err(dev, "no output endpoint found\n");
-			return -EINVAL;
-		}
-
-		panel_node = of_graph_get_remote_port_parent(endpoint);
-		of_node_put(endpoint);
-		if (!panel_node) {
-			dev_err(dev, "no output node found\n");
-			return -EINVAL;
-		}
-
-		panel = of_drm_find_panel(panel_node);
-		of_node_put(panel_node);
-		if (!panel)
-			return -EPROBE_DEFER;
-	}
+	ret = drm_of_find_panel_or_bridge(dev->of_node, 1, 0, &panel, NULL);
+	if (ret)
+		return ret;

 	dp = devm_kzalloc(dev, sizeof(*dp), GFP_KERNEL);
 	if (!dp)
diff --git a/drivers/gpu/drm/sun4i/sun4i_rgb.c b/drivers/gpu/drm/sun4i/sun4i_rgb.c
index f5e86fe7750e..49daea05d325 100644
--- a/drivers/gpu/drm/sun4i/sun4i_rgb.c
+++ b/drivers/gpu/drm/sun4i/sun4i_rgb.c
@@ -15,6 +15,7 @@
 #include <drm/drmP.h>
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_crtc_helper.h>
+#include <drm/drm_of.h>
 #include <drm/drm_panel.h>

 #include "sun4i_drv.h"
@@ -217,9 +218,9 @@ int sun4i_rgb_init(struct drm_device *drm)
 	rgb->drv = drv;
 	encoder = &rgb->encoder;

-	tcon->panel = sun4i_tcon_find_panel(tcon->dev->of_node);
-	encoder->bridge = sun4i_tcon_find_bridge(tcon->dev->of_node);
-	if (IS_ERR(tcon->panel) && IS_ERR(encoder->bridge)) {
+	ret = drm_of_find_panel_or_bridge(tcon->dev->of_node, 1, 0,
+					  &tcon->panel, &encoder->bridge);
+	if (ret) {
 		dev_info(drm->dev, "No panel or bridge found... RGB output disabled\n");
 		return 0;
 	}
@@ -239,7 +240,7 @@ int sun4i_rgb_init(struct drm_device *drm)
 	/* The RGB encoder can only work with the TCON channel 0 */
 	rgb->encoder.possible_crtcs = BIT(0);

-	if (!IS_ERR(tcon->panel)) {
+	if (tcon->panel) {
 		drm_connector_helper_add(&rgb->connector,
 					 &sun4i_rgb_con_helper_funcs);
 		ret = drm_connector_init(drm, &rgb->connector,
@@ -260,7 +261,7 @@ int sun4i_rgb_init(struct drm_device *drm)
 		}
 	}

-	if (!IS_ERR(encoder->bridge)) {
+	if (encoder->bridge) {
 		encoder->bridge->encoder = &rgb->encoder;

 		ret = drm_bridge_attach(drm, encoder->bridge);
@@ -268,8 +269,6 @@ int sun4i_rgb_init(struct drm_device *drm)
 			dev_err(drm->dev, "Couldn't attach our bridge\n");
 			goto err_cleanup_connector;
 		}
-	} else {
-		encoder->bridge = NULL;
 	}

 	return 0;
diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.c b/drivers/gpu/drm/sun4i/sun4i_tcon.c
index ea2906f87cb9..2e4e365cecf9 100644
--- a/drivers/gpu/drm/sun4i/sun4i_tcon.c
+++ b/drivers/gpu/drm/sun4i/sun4i_tcon.c
@@ -15,13 +15,12 @@
 #include <drm/drm_crtc.h>
 #include <drm/drm_crtc_helper.h>
 #include <drm/drm_modes.h>
-#include <drm/drm_panel.h>
+#include <drm/drm_of.h>

 #include <linux/component.h>
 #include <linux/ioport.h>
 #include <linux/of_address.h>
 #include <linux/of_device.h>
-#include <linux/of_graph.h>
 #include <linux/of_irq.h>
 #include <linux/regmap.h>
 #include <linux/reset.h>
@@ -405,74 +404,6 @@ static int sun4i_tcon_init_regmap(struct device *dev,
 	return 0;
 }

-struct drm_panel *sun4i_tcon_find_panel(struct device_node *node)
-{
-	struct device_node *port, *remote, *child;
-	struct device_node *end_node = NULL;
-
-	/* Inputs are listed first, then outputs */
-	port = of_graph_get_port_by_id(node, 1);
-
-	/*
-	 * Our first output is the RGB interface where the panel will
-	 * be connected.
-	 */
-	for_each_child_of_node(port, child) {
-		u32 reg;
-
-		of_property_read_u32(child, "reg", &reg);
-		if (reg == 0)
-			end_node = child;
-	}
-
-	if (!end_node) {
-		DRM_DEBUG_DRIVER("Missing panel endpoint\n");
-		return ERR_PTR(-ENODEV);
-	}
-
-	remote = of_graph_get_remote_port_parent(end_node);
-	if (!remote) {
-		DRM_DEBUG_DRIVER("Unable to parse remote node\n");
-		return ERR_PTR(-EINVAL);
-	}
-
-	return of_drm_find_panel(remote) ?: ERR_PTR(-EPROBE_DEFER);
-}
-
-struct drm_bridge *sun4i_tcon_find_bridge(struct device_node *node)
-{
-	struct device_node *port, *remote, *child;
-	struct device_node *end_node = NULL;
-
-	/* Inputs are listed first, then outputs */
-	port = of_graph_get_port_by_id(node, 1);
-
-	/*
-	 * Our first output is the RGB interface where the panel will
-	 * be connected.
-	 */
-	for_each_child_of_node(port, child) {
-		u32 reg;
-
-		of_property_read_u32(child, "reg", &reg);
-		if (reg == 0)
-			end_node = child;
-	}
-
-	if (!end_node) {
-		DRM_DEBUG_DRIVER("Missing bridge endpoint\n");
-		return ERR_PTR(-ENODEV);
-	}
-
-	remote = of_graph_get_remote_port_parent(end_node);
-	if (!remote) {
-		DRM_DEBUG_DRIVER("Enable to parse remote node\n");
-		return ERR_PTR(-EINVAL);
-	}
-
-	return of_drm_find_bridge(remote) ?: ERR_PTR(-EPROBE_DEFER);
-}
-
 static int sun4i_tcon_bind(struct device *dev, struct device *master,
 			   void *data)
 {
@@ -555,22 +486,11 @@ static int sun4i_tcon_probe(struct platform_device *pdev)
 	struct device_node *node = pdev->dev.of_node;
 	struct drm_bridge *bridge;
 	struct drm_panel *panel;
+	int ret;

-	/*
-	 * Neither the bridge or the panel is ready.
-	 * Defer the probe.
-	 */
-	panel = sun4i_tcon_find_panel(node);
-	bridge = sun4i_tcon_find_bridge(node);
-
-	/*
-	 * If we don't have a panel endpoint, just go on
-	 */
-	if ((PTR_ERR(panel) == -EPROBE_DEFER) &&
-	    (PTR_ERR(bridge) == -EPROBE_DEFER)) {
-		DRM_DEBUG_DRIVER("Still waiting for our panel/bridge. Deferring...\n");
-		return -EPROBE_DEFER;
-	}
+	ret = drm_of_find_panel_or_bridge(node, 1, 0, &panel, &bridge);
+	if (ret == -EPROBE_DEFER)
+		return ret;

 	return component_add(&pdev->dev, &sun4i_tcon_ops);
 }
--
2.10.1

[PATCH v2 5/6] drm: convert drivers to use drm_of_find_panel_or_bridge

[Rob Herring]

Similar to the previous commit, convert drivers open coding OF graph
parsing to use drm_of_find_panel_or_bridge instead.

This changes some error messages to debug messages (in the graph core).
Graph connections are often "no connects" depending on the particular
board, so we want to avoid spurious messages. Plus the kernel is not a
DT validator.

Signed-off-by: Rob Herring <robh@kernel.org>
---
v2:
- fix wrong node ptr in imx-ldb
- build fixes in kirin and imx drivers

 drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c | 64 ++++-------------
 drivers/gpu/drm/bridge/nxp-ptn3460.c             | 16 ++---
 drivers/gpu/drm/bridge/parade-ps8622.c           | 16 ++---
 drivers/gpu/drm/bridge/tc358767.c                | 27 +------
 drivers/gpu/drm/exynos/exynos_dp.c               | 35 ++++-----
 drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c        | 49 ++++---------
 drivers/gpu/drm/hisilicon/kirin/dw_drm_dsi.c     | 27 ++-----
 drivers/gpu/drm/imx/imx-ldb.c                    | 27 ++-----
 drivers/gpu/drm/imx/parallel-display.c           | 36 ++--------
 drivers/gpu/drm/mediatek/mtk_dsi.c               | 23 ++----
 drivers/gpu/drm/mxsfb/mxsfb_out.c                | 36 ++--------
 drivers/gpu/drm/rockchip/analogix_dp-rockchip.c  | 26 ++-----
 drivers/gpu/drm/sun4i/sun4i_rgb.c                | 13 ++--
 drivers/gpu/drm/sun4i/sun4i_tcon.c               | 90 ++----------------------
 14 files changed, 88 insertions(+), 397 deletions(-)

diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c
index 6119b5085501..4614048a4935 100644
--- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c
+++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c
@@ -22,7 +22,7 @@
 #include <linux/of_graph.h>

 #include <drm/drmP.h>
-#include <drm/drm_panel.h>
+#include <drm/drm_of.h>

 #include "atmel_hlcdc_dc.h"

@@ -152,29 +152,11 @@ static const struct drm_connector_funcs atmel_hlcdc_panel_connector_funcs = {
 	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 };

-static int atmel_hlcdc_check_endpoint(struct drm_device *dev,
-				      const struct of_endpoint *ep)
-{
-	struct device_node *np;
-	void *obj;
-
-	np = of_graph_get_remote_port_parent(ep->local_node);
-
-	obj = of_drm_find_panel(np);
-	if (!obj)
-		obj = of_drm_find_bridge(np);
-
-	of_node_put(np);
-
-	return obj ? 0 : -EPROBE_DEFER;
-}
-
 static int atmel_hlcdc_attach_endpoint(struct drm_device *dev,
-				       const struct of_endpoint *ep)
+				       const struct device_node *np)
 {
 	struct atmel_hlcdc_dc *dc = dev->dev_private;
 	struct atmel_hlcdc_rgb_output *output;
-	struct device_node *np;
 	struct drm_panel *panel;
 	struct drm_bridge *bridge;
 	int ret;
@@ -195,13 +177,11 @@ static int atmel_hlcdc_attach_endpoint(struct drm_device *dev,

 	output->encoder.possible_crtcs = 0x1;

-	np = of_graph_get_remote_port_parent(ep->local_node);
-
-	ret = -EPROBE_DEFER;
+	ret = drm_of_find_panel_or_bridge(np, 0, 0, &panel, &bridge);
+	if (ret)
+		return ret;

-	panel = of_drm_find_panel(np);
 	if (panel) {
-		of_node_put(np);
 		output->connector.dpms = DRM_MODE_DPMS_OFF;
 		output->connector.polled = DRM_CONNECTOR_POLL_CONNECT;
 		drm_connector_helper_add(&output->connector,
@@ -226,9 +206,6 @@ static int atmel_hlcdc_attach_endpoint(struct drm_device *dev,
 		return 0;
 	}

-	bridge = of_drm_find_bridge(np);
-	of_node_put(np);
-
 	if (bridge) {
 		output->encoder.bridge = bridge;
 		bridge->encoder = &output->encoder;
@@ -245,31 +222,14 @@ static int atmel_hlcdc_attach_endpoint(struct drm_device *dev,

 int atmel_hlcdc_create_outputs(struct drm_device *dev)
 {
-	struct device_node *ep_np = NULL;
-	struct of_endpoint ep;
+	struct device_node *remote;
 	int ret;

-	for_each_endpoint_of_node(dev->dev->of_node, ep_np) {
-		ret = of_graph_parse_endpoint(ep_np, &ep);
-		if (!ret)
-			ret = atmel_hlcdc_check_endpoint(dev, &ep);
-
-		if (ret) {
-			of_node_put(ep_np);
-			return ret;
-		}
-	}
-
-	for_each_endpoint_of_node(dev->dev->of_node, ep_np) {
-		ret = of_graph_parse_endpoint(ep_np, &ep);
-		if (!ret)
-			ret = atmel_hlcdc_attach_endpoint(dev, &ep);
-
-		if (ret) {
-			of_node_put(ep_np);
-			return ret;
-		}
-	}
+	remote = of_graph_get_remote_node(dev->dev->of_node, 0, 0);
+	if (!remote)
+		return -ENODEV;

-	return 0;
+	ret = atmel_hlcdc_attach_endpoint(dev, remote);
+	of_node_put(remote);
+	return ret;
 }
diff --git a/drivers/gpu/drm/bridge/nxp-ptn3460.c b/drivers/gpu/drm/bridge/nxp-ptn3460.c
index 27f98c518dde..351704390d02 100644
--- a/drivers/gpu/drm/bridge/nxp-ptn3460.c
+++ b/drivers/gpu/drm/bridge/nxp-ptn3460.c
@@ -20,8 +20,8 @@
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_gpio.h>
-#include <linux/of_graph.h>

+#include <drm/drm_of.h>
 #include <drm/drm_panel.h>

 #include "drm_crtc.h"
@@ -292,7 +292,6 @@ static int ptn3460_probe(struct i2c_client *client,
 {
 	struct device *dev = &client->dev;
 	struct ptn3460_bridge *ptn_bridge;
-	struct device_node *endpoint, *panel_node;
 	int ret;

 	ptn_bridge = devm_kzalloc(dev, sizeof(*ptn_bridge), GFP_KERNEL);
@@ -300,16 +299,9 @@ static int ptn3460_probe(struct i2c_client *client,
 		return -ENOMEM;
 	}

-	endpoint = of_graph_get_next_endpoint(dev->of_node, NULL);
-	if (endpoint) {
-		panel_node = of_graph_get_remote_port_parent(endpoint);
-		if (panel_node) {
-			ptn_bridge->panel = of_drm_find_panel(panel_node);
-			of_node_put(panel_node);
-			if (!ptn_bridge->panel)
-				return -EPROBE_DEFER;
-		}
-	}
+	ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &ptn_bridge->panel, NULL);
+	if (ret)
+		return ret;

 	ptn_bridge->client = client;

diff --git a/drivers/gpu/drm/bridge/parade-ps8622.c b/drivers/gpu/drm/bridge/parade-ps8622.c
index ac8cc5b50d9f..1dcec3b97e67 100644
--- a/drivers/gpu/drm/bridge/parade-ps8622.c
+++ b/drivers/gpu/drm/bridge/parade-ps8622.c
@@ -22,10 +22,10 @@
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
-#include <linux/of_graph.h>
 #include <linux/pm.h>
 #include <linux/regulator/consumer.h>

+#include <drm/drm_of.h>
 #include <drm/drm_panel.h>

 #include "drmP.h"
@@ -536,7 +536,6 @@ static int ps8622_probe(struct i2c_client *client,
 					const struct i2c_device_id *id)
 {
 	struct device *dev = &client->dev;
-	struct device_node *endpoint, *panel_node;
 	struct ps8622_bridge *ps8622;
 	int ret;

@@ -544,16 +543,9 @@ static int ps8622_probe(struct i2c_client *client,
 	if (!ps8622)
 		return -ENOMEM;

-	endpoint = of_graph_get_next_endpoint(dev->of_node, NULL);
-	if (endpoint) {
-		panel_node = of_graph_get_remote_port_parent(endpoint);
-		if (panel_node) {
-			ps8622->panel = of_drm_find_panel(panel_node);
-			of_node_put(panel_node);
-			if (!ps8622->panel)
-				return -EPROBE_DEFER;
-		}
-	}
+	ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &ps8622->panel, NULL);
+	if (ret)
+		return ret;

 	ps8622->client = client;

diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c
index de9ffb49e9f6..5c26488e7a2d 100644
--- a/drivers/gpu/drm/bridge/tc358767.c
+++ b/drivers/gpu/drm/bridge/tc358767.c
@@ -1244,7 +1244,6 @@ static const struct regmap_config tc_regmap_config = {
 static int tc_probe(struct i2c_client *client, const struct i2c_device_id *id)
 {
 	struct device *dev = &client->dev;
-	struct device_node *ep;
 	struct tc_data *tc;
 	int ret;

@@ -1255,29 +1254,9 @@ static int tc_probe(struct i2c_client *client, const struct i2c_device_id *id)
 	tc->dev = dev;

 	/* port@2 is the output port */
-	ep = of_graph_get_endpoint_by_regs(dev->of_node, 2, -1);
-	if (ep) {
-		struct device_node *remote;
-
-		remote = of_graph_get_remote_port_parent(ep);
-		if (!remote) {
-			dev_warn(dev, "endpoint %s not connected\n",
-				 ep->full_name);
-			of_node_put(ep);
-			return -ENODEV;
-		}
-		of_node_put(ep);
-		tc->panel = of_drm_find_panel(remote);
-		if (tc->panel) {
-			dev_dbg(dev, "found panel %s\n", remote->full_name);
-		} else {
-			dev_dbg(dev, "waiting for panel %s\n",
-				remote->full_name);
-			of_node_put(remote);
-			return -EPROBE_DEFER;
-		}
-		of_node_put(remote);
-	}
+	ret = drm_of_find_panel_or_bridge(dev->of_node, 2, 0, &tc->panel, NULL);
+	if (ret)
+		return ret;

 	/* Shut down GPIO is optional */
 	tc->sd_gpio = devm_gpiod_get_optional(dev, "shutdown", GPIOD_OUT_HIGH);
diff --git a/drivers/gpu/drm/exynos/exynos_dp.c b/drivers/gpu/drm/exynos/exynos_dp.c
index 528229faffe4..376c941c5189 100644
--- a/drivers/gpu/drm/exynos/exynos_dp.c
+++ b/drivers/gpu/drm/exynos/exynos_dp.c
@@ -23,6 +23,7 @@
 #include <drm/drmP.h>
 #include <drm/drm_crtc.h>
 #include <drm/drm_crtc_helper.h>
+#include <drm/drm_of.h>
 #include <drm/drm_panel.h>

 #include <drm/bridge/analogix_dp.h>
@@ -215,8 +216,11 @@ static const struct component_ops exynos_dp_ops = {
 static int exynos_dp_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
-	struct device_node *np = NULL, *endpoint = NULL;
+	struct device_node *np;
 	struct exynos_dp_device *dp;
+	struct drm_panel *panel;
+	struct drm_bridge *bridge;
+	int ret;

 	dp = devm_kzalloc(&pdev->dev, sizeof(struct exynos_dp_device),
 			  GFP_KERNEL);
@@ -240,28 +244,13 @@ static int exynos_dp_probe(struct platform_device *pdev)
 		goto out;
 	}

-	endpoint = of_graph_get_next_endpoint(dev->of_node, NULL);
-	if (endpoint) {
-		np = of_graph_get_remote_port_parent(endpoint);
-		if (np) {
-			/* The remote port can be either a panel or a bridge */
-			dp->plat_data.panel = of_drm_find_panel(np);
-			if (!dp->plat_data.panel) {
-				dp->ptn_bridge = of_drm_find_bridge(np);
-				if (!dp->ptn_bridge) {
-					of_node_put(np);
-					return -EPROBE_DEFER;
-				}
-			}
-			of_node_put(np);
-		} else {
-			DRM_ERROR("no remote endpoint device node found.\n");
-			return -EINVAL;
-		}
-	} else {
-		DRM_ERROR("no port endpoint subnode found.\n");
-		return -EINVAL;
-	}
+	ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &panel, &bridge);
+	if (ret)
+		return ret;
+
+	/* The remote port can be either a panel or a bridge */
+	dp->plat_data.panel = panel;
+	dp->ptn_bridge = bridge;

 out:
 	return component_add(&pdev->dev, &exynos_dp_ops);
diff --git a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c
index 05a8ee106879..3cae7dd75834 100644
--- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c
+++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c
@@ -15,6 +15,7 @@
 #include <drm/drmP.h>
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_crtc_helper.h>
+#include <drm/drm_of.h>
 #include <drm/drm_panel.h>

 #include "fsl_dcu_drm_drv.h"
@@ -141,35 +142,11 @@ static int fsl_dcu_attach_panel(struct fsl_dcu_drm_device *fsl_dev,
 	return ret;
 }

-static int fsl_dcu_attach_endpoint(struct fsl_dcu_drm_device *fsl_dev,
-				   const struct of_endpoint *ep)
-{
-	struct drm_bridge *bridge;
-	struct device_node *np;
-
-	np = of_graph_get_remote_port_parent(ep->local_node);
-
-	fsl_dev->connector.panel = of_drm_find_panel(np);
-	if (fsl_dev->connector.panel) {
-		of_node_put(np);
-		return fsl_dcu_attach_panel(fsl_dev, fsl_dev->connector.panel);
-	}
-
-	bridge = of_drm_find_bridge(np);
-	of_node_put(np);
-	if (!bridge)
-		return -ENODEV;
-
-	fsl_dev->encoder.bridge = bridge;
-	bridge->encoder = &fsl_dev->encoder;
-
-	return drm_bridge_attach(fsl_dev->drm, bridge);
-}
-
 int fsl_dcu_create_outputs(struct fsl_dcu_drm_device *fsl_dev)
 {
-	struct of_endpoint ep;
-	struct device_node *ep_node, *panel_node;
+	struct device_node *panel_node;
+	struct drm_bridge *bridge;
+	struct drm_panel *panel;
 	int ret;

 	/* This is for backward compatibility */
@@ -182,14 +159,16 @@ int fsl_dcu_create_outputs(struct fsl_dcu_drm_device *fsl_dev)
 		return fsl_dcu_attach_panel(fsl_dev, fsl_dev->connector.panel);
 	}

-	ep_node = of_graph_get_next_endpoint(fsl_dev->np, NULL);
-	if (!ep_node)
-		return -ENODEV;
-
-	ret = of_graph_parse_endpoint(ep_node, &ep);
-	of_node_put(ep_node);
+	ret = drm_of_find_panel_or_bridge(fsl_dev->np, 0, 0, &panel, &bridge);
 	if (ret)
-		return -ENODEV;
+		return ret;

-	return fsl_dcu_attach_endpoint(fsl_dev, &ep);
+	if (panel) {
+		fsl_dev->connector.panel = panel;
+		return fsl_dcu_attach_panel(fsl_dev, panel);
+	}
+
+	fsl_dev->encoder.bridge = bridge;
+	bridge->encoder = &fsl_dev->encoder;
+	return drm_bridge_attach(fsl_dev->drm, bridge);
 }
diff --git a/drivers/gpu/drm/hisilicon/kirin/dw_drm_dsi.c b/drivers/gpu/drm/hisilicon/kirin/dw_drm_dsi.c
index 998452ad0fcb..0f23e2c55862 100644
--- a/drivers/gpu/drm/hisilicon/kirin/dw_drm_dsi.c
+++ b/drivers/gpu/drm/hisilicon/kirin/dw_drm_dsi.c
@@ -17,7 +17,6 @@

 #include <linux/clk.h>
 #include <linux/component.h>
-#include <linux/of_graph.h>

 #include <drm/drm_of.h>
 #include <drm/drm_crtc_helper.h>
@@ -757,34 +756,16 @@ static int dsi_parse_dt(struct platform_device *pdev, struct dw_dsi *dsi)
 {
 	struct dsi_hw_ctx *ctx = dsi->ctx;
 	struct device_node *np = pdev->dev.of_node;
-	struct device_node *endpoint, *bridge_node;
-	struct drm_bridge *bridge;
 	struct resource *res;
+	int ret;

 	/*
 	 * Get the endpoint node. In our case, dsi has one output port1
 	 * to which the external HDMI bridge is connected.
 	 */
-	endpoint = of_graph_get_endpoint_by_regs(np, 1, -1);
-	if (!endpoint) {
-		DRM_ERROR("no valid endpoint node\n");
-		return -ENODEV;
-	}
-	of_node_put(endpoint);
-
-	bridge_node = of_graph_get_remote_port_parent(endpoint);
-	if (!bridge_node) {
-		DRM_ERROR("no valid bridge node\n");
-		return -ENODEV;
-	}
-	of_node_put(bridge_node);
-
-	bridge = of_drm_find_bridge(bridge_node);
-	if (!bridge) {
-		DRM_INFO("wait for external HDMI bridge driver.\n");
-		return -EPROBE_DEFER;
-	}
-	dsi->bridge = bridge;
+	ret = drm_of_find_panel_or_bridge(np, 0, 0, NULL, &dsi->bridge);
+	if (ret)
+		return ret;

 	ctx->pclk = devm_clk_get(&pdev->dev, "pclk");
 	if (IS_ERR(ctx->pclk)) {
diff --git a/drivers/gpu/drm/imx/imx-ldb.c b/drivers/gpu/drm/imx/imx-ldb.c
index 516d06490465..506d5c1d1263 100644
--- a/drivers/gpu/drm/imx/imx-ldb.c
+++ b/drivers/gpu/drm/imx/imx-ldb.c
@@ -649,7 +649,6 @@ static int imx_ldb_bind(struct device *dev, struct device *master, void *data)

 	for_each_child_of_node(np, child) {
 		struct imx_ldb_channel *channel;
-		struct device_node *ep;
 		int bus_format;

 		ret = of_property_read_u32(child, "reg", &i);
@@ -673,27 +672,11 @@ static int imx_ldb_bind(struct device *dev, struct device *master, void *data)
 		 * The output port is port@4 with an external 4-port mux or
 		 * port@2 with the internal 2-port mux.
 		 */
-		ep = of_graph_get_endpoint_by_regs(child,
-						   imx_ldb->lvds_mux ? 4 : 2,
-						   -1);
-		if (ep) {
-			struct device_node *remote;
-
-			remote = of_graph_get_remote_port_parent(ep);
-			of_node_put(ep);
-			if (remote) {
-				channel->panel = of_drm_find_panel(remote);
-				channel->bridge = of_drm_find_bridge(remote);
-			} else
-				return -EPROBE_DEFER;
-			of_node_put(remote);
-
-			if (!channel->panel && !channel->bridge) {
-				dev_err(dev, "panel/bridge not found: %s\n",
-					remote->full_name);
-				return -EPROBE_DEFER;
-			}
-		}
+		ret = drm_of_find_panel_or_bridge(child,
+						  imx_ldb->lvds_mux ? 4 : 2, 0,
+						  &channel->panel, &channel->bridge);
+		if (ret)
+			return ret;

 		/* panel ddc only if there is no bridge */
 		if (!channel->bridge) {
diff --git a/drivers/gpu/drm/imx/parallel-display.c b/drivers/gpu/drm/imx/parallel-display.c
index 8582a83c0d9b..92336f38c55e 100644
--- a/drivers/gpu/drm/imx/parallel-display.c
+++ b/drivers/gpu/drm/imx/parallel-display.c
@@ -19,10 +19,10 @@
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_fb_helper.h>
 #include <drm/drm_crtc_helper.h>
+#include <drm/drm_of.h>
 #include <drm/drm_panel.h>
 #include <linux/videodev2.h>
 #include <video/of_display_timing.h>
-#include <linux/of_graph.h>

 #include "imx-drm.h"

@@ -210,7 +210,6 @@ static int imx_pd_bind(struct device *dev, struct device *master, void *data)
 {
 	struct drm_device *drm = data;
 	struct device_node *np = dev->of_node;
-	struct device_node *ep;
 	const u8 *edidp;
 	struct imx_parallel_display *imxpd;
 	int ret;
@@ -239,36 +238,9 @@ static int imx_pd_bind(struct device *dev, struct device *master, void *data)
 	imxpd->bus_format = bus_format;

 	/* port@1 is the output port */
-	ep = of_graph_get_endpoint_by_regs(np, 1, -1);
-	if (ep) {
-		struct device_node *remote;
-
-		remote = of_graph_get_remote_port_parent(ep);
-		if (!remote) {
-			dev_warn(dev, "endpoint %s not connected\n",
-				 ep->full_name);
-			of_node_put(ep);
-			return -ENODEV;
-		}
-		of_node_put(ep);
-
-		imxpd->panel = of_drm_find_panel(remote);
-		if (imxpd->panel) {
-			dev_dbg(dev, "found panel %s\n", remote->full_name);
-		} else {
-			imxpd->bridge = of_drm_find_bridge(remote);
-			if (imxpd->bridge)
-				dev_dbg(dev, "found bridge %s\n",
-					remote->full_name);
-		}
-		if (!imxpd->panel && !imxpd->bridge) {
-			dev_dbg(dev, "waiting for panel or bridge %s\n",
-				remote->full_name);
-			of_node_put(remote);
-			return -EPROBE_DEFER;
-		}
-		of_node_put(remote);
-	}
+	ret = drm_of_find_panel_or_bridge(np, 1, 0, &imxpd->panel, &imxpd->bridge);
+	if (ret)
+		return ret;

 	imxpd->dev = dev;

diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
index 2c42f90809d8..14140579f8d4 100644
--- a/drivers/gpu/drm/mediatek/mtk_dsi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
@@ -16,11 +16,11 @@
 #include <drm/drm_crtc_helper.h>
 #include <drm/drm_mipi_dsi.h>
 #include <drm/drm_panel.h>
+#include <drm/drm_of.h>
 #include <linux/clk.h>
 #include <linux/component.h>
 #include <linux/of.h>
 #include <linux/of_platform.h>
-#include <linux/of_graph.h>
 #include <linux/phy/phy.h>
 #include <linux/platform_device.h>
 #include <video/videomode.h>
@@ -819,7 +819,6 @@ static int mtk_dsi_probe(struct platform_device *pdev)
 {
 	struct mtk_dsi *dsi;
 	struct device *dev = &pdev->dev;
-	struct device_node *remote_node, *endpoint;
 	struct resource *regs;
 	int comp_id;
 	int ret;
@@ -831,22 +830,10 @@ static int mtk_dsi_probe(struct platform_device *pdev)
 	dsi->host.ops = &mtk_dsi_ops;
 	dsi->host.dev = dev;

-	endpoint = of_graph_get_next_endpoint(dev->of_node, NULL);
-	if (endpoint) {
-		remote_node = of_graph_get_remote_port_parent(endpoint);
-		if (!remote_node) {
-			dev_err(dev, "No panel connected\n");
-			return -ENODEV;
-		}
-
-		dsi->bridge = of_drm_find_bridge(remote_node);
-		dsi->panel = of_drm_find_panel(remote_node);
-		of_node_put(remote_node);
-		if (!dsi->bridge && !dsi->panel) {
-			dev_info(dev, "Waiting for bridge or panel driver\n");
-			return -EPROBE_DEFER;
-		}
-	}
+	ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0,
+					  &dsi->panel, &dsi->bridge);
+	if (ret)
+		return ret;

 	dsi->engine_clk = devm_clk_get(dev, "engine");
 	if (IS_ERR(dsi->engine_clk)) {
diff --git a/drivers/gpu/drm/mxsfb/mxsfb_out.c b/drivers/gpu/drm/mxsfb/mxsfb_out.c
index fa8d17399407..f7d729aa09bd 100644
--- a/drivers/gpu/drm/mxsfb/mxsfb_out.c
+++ b/drivers/gpu/drm/mxsfb/mxsfb_out.c
@@ -19,6 +19,7 @@
 #include <drm/drm_crtc_helper.h>
 #include <drm/drm_fb_cma_helper.h>
 #include <drm/drm_gem_cma_helper.h>
+#include <drm/drm_of.h>
 #include <drm/drm_panel.h>
 #include <drm/drm_plane_helper.h>
 #include <drm/drm_simple_kms_helper.h>
@@ -82,20 +83,15 @@ static const struct drm_connector_funcs mxsfb_panel_connector_funcs = {
 	.atomic_destroy_state	= drm_atomic_helper_connector_destroy_state,
 };

-static int mxsfb_attach_endpoint(struct drm_device *drm,
-				 const struct of_endpoint *ep)
+int mxsfb_create_output(struct drm_device *drm)
 {
 	struct mxsfb_drm_private *mxsfb = drm->dev_private;
-	struct device_node *np;
 	struct drm_panel *panel;
-	int ret = -EPROBE_DEFER;
-
-	np = of_graph_get_remote_port_parent(ep->local_node);
-	panel = of_drm_find_panel(np);
-	of_node_put(np);
+	int ret;

-	if (!panel)
-		return -EPROBE_DEFER;
+	ret = drm_of_find_panel_or_bridge(drm->dev->of_node, 0, 0, &panel, NULL);
+	if (ret)
+		return ret;

 	mxsfb->connector.dpms = DRM_MODE_DPMS_OFF;
 	mxsfb->connector.polled = 0;
@@ -109,23 +105,3 @@ static int mxsfb_attach_endpoint(struct drm_device *drm,

 	return ret;
 }
-
-int mxsfb_create_output(struct drm_device *drm)
-{
-	struct device_node *ep_np = NULL;
-	struct of_endpoint ep;
-	int ret;
-
-	for_each_endpoint_of_node(drm->dev->of_node, ep_np) {
-		ret = of_graph_parse_endpoint(ep_np, &ep);
-		if (!ret)
-			ret = mxsfb_attach_endpoint(drm, &ep);
-
-		if (ret) {
-			of_node_put(ep_np);
-			return ret;
-		}
-	}
-
-	return 0;
-}
diff --git a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
index 8548e8271639..615afad280a8 100644
--- a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
+++ b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
@@ -428,31 +428,13 @@ static const struct component_ops rockchip_dp_component_ops = {
 static int rockchip_dp_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
-	struct device_node *panel_node, *port, *endpoint;
 	struct drm_panel *panel = NULL;
 	struct rockchip_dp_device *dp;
+	int ret;

-	port = of_graph_get_port_by_id(dev->of_node, 1);
-	if (port) {
-		endpoint = of_get_child_by_name(port, "endpoint");
-		of_node_put(port);
-		if (!endpoint) {
-			dev_err(dev, "no output endpoint found\n");
-			return -EINVAL;
-		}
-
-		panel_node = of_graph_get_remote_port_parent(endpoint);
-		of_node_put(endpoint);
-		if (!panel_node) {
-			dev_err(dev, "no output node found\n");
-			return -EINVAL;
-		}
-
-		panel = of_drm_find_panel(panel_node);
-		of_node_put(panel_node);
-		if (!panel)
-			return -EPROBE_DEFER;
-	}
+	ret = drm_of_find_panel_or_bridge(dev->of_node, 1, 0, &panel, NULL);
+	if (ret)
+		return ret;

 	dp = devm_kzalloc(dev, sizeof(*dp), GFP_KERNEL);
 	if (!dp)
diff --git a/drivers/gpu/drm/sun4i/sun4i_rgb.c b/drivers/gpu/drm/sun4i/sun4i_rgb.c
index f5e86fe7750e..49daea05d325 100644
--- a/drivers/gpu/drm/sun4i/sun4i_rgb.c
+++ b/drivers/gpu/drm/sun4i/sun4i_rgb.c
@@ -15,6 +15,7 @@
 #include <drm/drmP.h>
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_crtc_helper.h>
+#include <drm/drm_of.h>
 #include <drm/drm_panel.h>

 #include "sun4i_drv.h"
@@ -217,9 +218,9 @@ int sun4i_rgb_init(struct drm_device *drm)
 	rgb->drv = drv;
 	encoder = &rgb->encoder;

-	tcon->panel = sun4i_tcon_find_panel(tcon->dev->of_node);
-	encoder->bridge = sun4i_tcon_find_bridge(tcon->dev->of_node);
-	if (IS_ERR(tcon->panel) && IS_ERR(encoder->bridge)) {
+	ret = drm_of_find_panel_or_bridge(tcon->dev->of_node, 1, 0,
+					  &tcon->panel, &encoder->bridge);
+	if (ret) {
 		dev_info(drm->dev, "No panel or bridge found... RGB output disabled\n");
 		return 0;
 	}
@@ -239,7 +240,7 @@ int sun4i_rgb_init(struct drm_device *drm)
 	/* The RGB encoder can only work with the TCON channel 0 */
 	rgb->encoder.possible_crtcs = BIT(0);

-	if (!IS_ERR(tcon->panel)) {
+	if (tcon->panel) {
 		drm_connector_helper_add(&rgb->connector,
 					 &sun4i_rgb_con_helper_funcs);
 		ret = drm_connector_init(drm, &rgb->connector,
@@ -260,7 +261,7 @@ int sun4i_rgb_init(struct drm_device *drm)
 		}
 	}

-	if (!IS_ERR(encoder->bridge)) {
+	if (encoder->bridge) {
 		encoder->bridge->encoder = &rgb->encoder;

 		ret = drm_bridge_attach(drm, encoder->bridge);
@@ -268,8 +269,6 @@ int sun4i_rgb_init(struct drm_device *drm)
 			dev_err(drm->dev, "Couldn't attach our bridge\n");
 			goto err_cleanup_connector;
 		}
-	} else {
-		encoder->bridge = NULL;
 	}

 	return 0;
diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.c b/drivers/gpu/drm/sun4i/sun4i_tcon.c
index ea2906f87cb9..2e4e365cecf9 100644
--- a/drivers/gpu/drm/sun4i/sun4i_tcon.c
+++ b/drivers/gpu/drm/sun4i/sun4i_tcon.c
@@ -15,13 +15,12 @@
 #include <drm/drm_crtc.h>
 #include <drm/drm_crtc_helper.h>
 #include <drm/drm_modes.h>
-#include <drm/drm_panel.h>
+#include <drm/drm_of.h>

 #include <linux/component.h>
 #include <linux/ioport.h>
 #include <linux/of_address.h>
 #include <linux/of_device.h>
-#include <linux/of_graph.h>
 #include <linux/of_irq.h>
 #include <linux/regmap.h>
 #include <linux/reset.h>
@@ -405,74 +404,6 @@ static int sun4i_tcon_init_regmap(struct device *dev,
 	return 0;
 }

-struct drm_panel *sun4i_tcon_find_panel(struct device_node *node)
-{
-	struct device_node *port, *remote, *child;
-	struct device_node *end_node = NULL;
-
-	/* Inputs are listed first, then outputs */
-	port = of_graph_get_port_by_id(node, 1);
-
-	/*
-	 * Our first output is the RGB interface where the panel will
-	 * be connected.
-	 */
-	for_each_child_of_node(port, child) {
-		u32 reg;
-
-		of_property_read_u32(child, "reg", &reg);
-		if (reg == 0)
-			end_node = child;
-	}
-
-	if (!end_node) {
-		DRM_DEBUG_DRIVER("Missing panel endpoint\n");
-		return ERR_PTR(-ENODEV);
-	}
-
-	remote = of_graph_get_remote_port_parent(end_node);
-	if (!remote) {
-		DRM_DEBUG_DRIVER("Unable to parse remote node\n");
-		return ERR_PTR(-EINVAL);
-	}
-
-	return of_drm_find_panel(remote) ?: ERR_PTR(-EPROBE_DEFER);
-}
-
-struct drm_bridge *sun4i_tcon_find_bridge(struct device_node *node)
-{
-	struct device_node *port, *remote, *child;
-	struct device_node *end_node = NULL;
-
-	/* Inputs are listed first, then outputs */
-	port = of_graph_get_port_by_id(node, 1);
-
-	/*
-	 * Our first output is the RGB interface where the panel will
-	 * be connected.
-	 */
-	for_each_child_of_node(port, child) {
-		u32 reg;
-
-		of_property_read_u32(child, "reg", &reg);
-		if (reg == 0)
-			end_node = child;
-	}
-
-	if (!end_node) {
-		DRM_DEBUG_DRIVER("Missing bridge endpoint\n");
-		return ERR_PTR(-ENODEV);
-	}
-
-	remote = of_graph_get_remote_port_parent(end_node);
-	if (!remote) {
-		DRM_DEBUG_DRIVER("Enable to parse remote node\n");
-		return ERR_PTR(-EINVAL);
-	}
-
-	return of_drm_find_bridge(remote) ?: ERR_PTR(-EPROBE_DEFER);
-}
-
 static int sun4i_tcon_bind(struct device *dev, struct device *master,
 			   void *data)
 {
@@ -555,22 +486,11 @@ static int sun4i_tcon_probe(struct platform_device *pdev)
 	struct device_node *node = pdev->dev.of_node;
 	struct drm_bridge *bridge;
 	struct drm_panel *panel;
+	int ret;

-	/*
-	 * Neither the bridge or the panel is ready.
-	 * Defer the probe.
-	 */
-	panel = sun4i_tcon_find_panel(node);
-	bridge = sun4i_tcon_find_bridge(node);
-
-	/*
-	 * If we don't have a panel endpoint, just go on
-	 */
-	if ((PTR_ERR(panel) == -EPROBE_DEFER) &&
-	    (PTR_ERR(bridge) == -EPROBE_DEFER)) {
-		DRM_DEBUG_DRIVER("Still waiting for our panel/bridge. Deferring...\n");
-		return -EPROBE_DEFER;
-	}
+	ret = drm_of_find_panel_or_bridge(node, 1, 0, &panel, &bridge);
+	if (ret == -EPROBE_DEFER)
+		return ret;

 	return component_add(&pdev->dev, &sun4i_tcon_ops);
 }
--
2.10.1

[PATCH v2 6/6] drm: omap: use common OF graph helpers

[Rob Herring]

The OMAP driver has its own OF graph helpers that are similar to the
common helpers. This commit replaces most of the calls with the common
helpers. There's still a couple of custom helpers left, but the driver
needs more extensive changes to get rid of them.

In dss_init_ports, we invert the loop, looping through the known ports
and matching them to DT nodes rather than looping thru DT nodes and
matching them to the ports.

Signed-off-by: Rob Herring <robh@kernel.org>
---
v2:
- build fixes in hdmi5 and sdi

 drivers/gpu/drm/omapdrm/dss/dpi.c     |   2 +-
 drivers/gpu/drm/omapdrm/dss/dsi.c     |   3 +-
 drivers/gpu/drm/omapdrm/dss/dss-of.c  | 102 +---------------------------------
 drivers/gpu/drm/omapdrm/dss/dss.c     |  61 +++++---------------
 drivers/gpu/drm/omapdrm/dss/hdmi4.c   |   3 +-
 drivers/gpu/drm/omapdrm/dss/hdmi5.c   |   3 +-
 drivers/gpu/drm/omapdrm/dss/omapdss.h |  11 ----
 drivers/gpu/drm/omapdrm/dss/sdi.c     |   2 +-
 drivers/gpu/drm/omapdrm/dss/venc.c    |   3 +-
 9 files changed, 26 insertions(+), 164 deletions(-)

diff --git a/drivers/gpu/drm/omapdrm/dss/dpi.c b/drivers/gpu/drm/omapdrm/dss/dpi.c
index e75162d26ac0..e5bb494d4689 100644
--- a/drivers/gpu/drm/omapdrm/dss/dpi.c
+++ b/drivers/gpu/drm/omapdrm/dss/dpi.c
@@ -855,7 +855,7 @@ int dpi_init_port(struct platform_device *pdev, struct device_node *port)
 	if (!dpi)
 		return -ENOMEM;

-	ep = omapdss_of_get_next_endpoint(port, NULL);
+	ep = of_get_next_child(port, NULL);
 	if (!ep)
 		return 0;

diff --git a/drivers/gpu/drm/omapdrm/dss/dsi.c b/drivers/gpu/drm/omapdrm/dss/dsi.c
index f060bda31235..d63e240513f1 100644
--- a/drivers/gpu/drm/omapdrm/dss/dsi.c
+++ b/drivers/gpu/drm/omapdrm/dss/dsi.c
@@ -39,6 +39,7 @@
 #include <linux/debugfs.h>
 #include <linux/pm_runtime.h>
 #include <linux/of.h>
+#include <linux/of_graph.h>
 #include <linux/of_platform.h>
 #include <linux/component.h>

@@ -5091,7 +5092,7 @@ static int dsi_probe_of(struct platform_device *pdev)
 	struct device_node *ep;
 	struct omap_dsi_pin_config pin_cfg;

-	ep = omapdss_of_get_first_endpoint(node);
+	ep = of_graph_get_endpoint_by_regs(node, 0, 0);
 	if (!ep)
 		return 0;

diff --git a/drivers/gpu/drm/omapdrm/dss/dss-of.c b/drivers/gpu/drm/omapdrm/dss/dss-of.c
index dfd4e9621e3b..eb520ab45ddd 100644
--- a/drivers/gpu/drm/omapdrm/dss/dss-of.c
+++ b/drivers/gpu/drm/omapdrm/dss/dss-of.c
@@ -16,77 +16,12 @@
 #include <linux/err.h>
 #include <linux/module.h>
 #include <linux/of.h>
+#include <linux/of_graph.h>
 #include <linux/seq_file.h>

 #include "omapdss.h"
 #include "dss.h"

-struct device_node *
-omapdss_of_get_next_port(const struct device_node *parent,
-			 struct device_node *prev)
-{
-	struct device_node *port = NULL;
-
-	if (!parent)
-		return NULL;
-
-	if (!prev) {
-		struct device_node *ports;
-		/*
-		 * It's the first call, we have to find a port subnode
-		 * within this node or within an optional 'ports' node.
-		 */
-		ports = of_get_child_by_name(parent, "ports");
-		if (ports)
-			parent = ports;
-
-		port = of_get_child_by_name(parent, "port");
-
-		/* release the 'ports' node */
-		of_node_put(ports);
-	} else {
-		struct device_node *ports;
-
-		ports = of_get_parent(prev);
-		if (!ports)
-			return NULL;
-
-		do {
-			port = of_get_next_child(ports, prev);
-			if (!port) {
-				of_node_put(ports);
-				return NULL;
-			}
-			prev = port;
-		} while (of_node_cmp(port->name, "port") != 0);
-
-		of_node_put(ports);
-	}
-
-	return port;
-}
-EXPORT_SYMBOL_GPL(omapdss_of_get_next_port);
-
-struct device_node *
-omapdss_of_get_next_endpoint(const struct device_node *parent,
-			     struct device_node *prev)
-{
-	struct device_node *ep = NULL;
-
-	if (!parent)
-		return NULL;
-
-	do {
-		ep = of_get_next_child(parent, prev);
-		if (!ep)
-			return NULL;
-		prev = ep;
-	} while (of_node_cmp(ep->name, "endpoint") != 0);
-
-	return ep;
-}
-EXPORT_SYMBOL_GPL(omapdss_of_get_next_endpoint);
-
 struct device_node *dss_of_port_get_parent_device(struct device_node *port)
 {
 	struct device_node *np;
@@ -123,37 +58,6 @@ u32 dss_of_port_get_port_number(struct device_node *port)
 	return reg;
 }

-static struct device_node *omapdss_of_get_remote_port(const struct device_node *node)
-{
-	struct device_node *np;
-
-	np = of_parse_phandle(node, "remote-endpoint", 0);
-	if (!np)
-		return NULL;
-
-	np = of_get_next_parent(np);
-
-	return np;
-}
-
-struct device_node *
-omapdss_of_get_first_endpoint(const struct device_node *parent)
-{
-	struct device_node *port, *ep;
-
-	port = omapdss_of_get_next_port(parent, NULL);
-
-	if (!port)
-		return NULL;
-
-	ep = omapdss_of_get_next_endpoint(port, NULL);
-
-	of_node_put(port);
-
-	return ep;
-}
-EXPORT_SYMBOL_GPL(omapdss_of_get_first_endpoint);
-
 struct omap_dss_device *
 omapdss_of_find_source_for_first_ep(struct device_node *node)
 {
@@ -161,11 +65,11 @@ omapdss_of_find_source_for_first_ep(struct device_node *node)
 	struct device_node *src_port;
 	struct omap_dss_device *src;

-	ep = omapdss_of_get_first_endpoint(node);
+	ep = of_graph_get_endpoint_by_regs(node, 0, 0);
 	if (!ep)
 		return ERR_PTR(-EINVAL);

-	src_port = omapdss_of_get_remote_port(ep);
+	src_port = of_graph_get_remote_port(ep);
 	if (!src_port) {
 		of_node_put(ep);
 		return ERR_PTR(-EINVAL);
diff --git a/drivers/gpu/drm/omapdrm/dss/dss.c b/drivers/gpu/drm/omapdrm/dss/dss.c
index 14887d5b02e5..2734c401d9fa 100644
--- a/drivers/gpu/drm/omapdrm/dss/dss.c
+++ b/drivers/gpu/drm/omapdrm/dss/dss.c
@@ -38,6 +38,7 @@
 #include <linux/mfd/syscon.h>
 #include <linux/regmap.h>
 #include <linux/of.h>
+#include <linux/of_graph.h>
 #include <linux/regulator/consumer.h>
 #include <linux/suspend.h>
 #include <linux/component.h>
@@ -1043,32 +1044,14 @@ static int dss_init_ports(struct platform_device *pdev)
 {
 	struct device_node *parent = pdev->dev.of_node;
 	struct device_node *port;
-	int r;
-
-	if (parent == NULL)
-		return 0;
+	int i;

-	port = omapdss_of_get_next_port(parent, NULL);
-	if (!port)
-		return 0;
-
-	if (dss.feat->num_ports == 0)
-		return 0;
-
-	do {
-		enum omap_display_type port_type;
-		u32 reg;
-
-		r = of_property_read_u32(port, "reg", &reg);
-		if (r)
-			reg = 0;
-
-		if (reg >= dss.feat->num_ports)
+	for (i = 0; i < dss.feat->num_ports; i++) {
+		port = of_graph_get_port_by_id(parent, i);
+		if (!port)
 			continue;

-		port_type = dss.feat->ports[reg];
-
-		switch (port_type) {
+		switch (dss.feat->ports[i]) {
 		case OMAP_DISPLAY_TYPE_DPI:
 			dpi_init_port(pdev, port);
 			break;
@@ -1078,7 +1061,7 @@ static int dss_init_ports(struct platform_device *pdev)
 		default:
 			break;
 		}
-	} while ((port = omapdss_of_get_next_port(parent, port)) != NULL);
+	}

 	return 0;
 }
@@ -1087,32 +1070,14 @@ static void dss_uninit_ports(struct platform_device *pdev)
 {
 	struct device_node *parent = pdev->dev.of_node;
 	struct device_node *port;
+	int i;

-	if (parent == NULL)
-		return;
-
-	port = omapdss_of_get_next_port(parent, NULL);
-	if (!port)
-		return;
-
-	if (dss.feat->num_ports == 0)
-		return;
-
-	do {
-		enum omap_display_type port_type;
-		u32 reg;
-		int r;
-
-		r = of_property_read_u32(port, "reg", &reg);
-		if (r)
-			reg = 0;
-
-		if (reg >= dss.feat->num_ports)
+	for (i = 0; i < dss.feat->num_ports; i++) {
+		port = of_graph_get_port_by_id(parent, i);
+		if (!port)
 			continue;

-		port_type = dss.feat->ports[reg];
-
-		switch (port_type) {
+		switch (dss.feat->ports[i]) {
 		case OMAP_DISPLAY_TYPE_DPI:
 			dpi_uninit_port(port);
 			break;
@@ -1122,7 +1087,7 @@ static void dss_uninit_ports(struct platform_device *pdev)
 		default:
 			break;
 		}
-	} while ((port = omapdss_of_get_next_port(parent, port)) != NULL);
+	}
 }

 static int dss_video_pll_probe(struct platform_device *pdev)
diff --git a/drivers/gpu/drm/omapdrm/dss/hdmi4.c b/drivers/gpu/drm/omapdrm/dss/hdmi4.c
index e7162c16de2e..87c53034c634 100644
--- a/drivers/gpu/drm/omapdrm/dss/hdmi4.c
+++ b/drivers/gpu/drm/omapdrm/dss/hdmi4.c
@@ -34,6 +34,7 @@
 #include <linux/regulator/consumer.h>
 #include <linux/component.h>
 #include <linux/of.h>
+#include <linux/of_graph.h>
 #include <sound/omap-hdmi-audio.h>

 #include "omapdss.h"
@@ -546,7 +547,7 @@ static int hdmi_probe_of(struct platform_device *pdev)
 	struct device_node *ep;
 	int r;

-	ep = omapdss_of_get_first_endpoint(node);
+	ep = of_graph_get_endpoint_by_regs(node, 0, 0);
 	if (!ep)
 		return 0;

diff --git a/drivers/gpu/drm/omapdrm/dss/hdmi5.c b/drivers/gpu/drm/omapdrm/dss/hdmi5.c
index 678dfb02764a..d13dce7e8079 100644
--- a/drivers/gpu/drm/omapdrm/dss/hdmi5.c
+++ b/drivers/gpu/drm/omapdrm/dss/hdmi5.c
@@ -39,6 +39,7 @@
 #include <linux/regulator/consumer.h>
 #include <linux/component.h>
 #include <linux/of.h>
+#include <linux/of_graph.h>
 #include <sound/omap-hdmi-audio.h>

 #include "omapdss.h"
@@ -572,7 +573,7 @@ static int hdmi_probe_of(struct platform_device *pdev)
 	struct device_node *ep;
 	int r;

-	ep = omapdss_of_get_first_endpoint(node);
+	ep = of_graph_get_endpoint_by_regs(node, 0, 0);
 	if (!ep)
 		return 0;

diff --git a/drivers/gpu/drm/omapdrm/dss/omapdss.h b/drivers/gpu/drm/omapdrm/dss/omapdss.h
index b420dde8c0fb..acf4e520baaf 100644
--- a/drivers/gpu/drm/omapdrm/dss/omapdss.h
+++ b/drivers/gpu/drm/omapdrm/dss/omapdss.h
@@ -830,17 +830,6 @@ static inline bool omapdss_device_is_enabled(struct omap_dss_device *dssdev)
 	return dssdev->state == OMAP_DSS_DISPLAY_ACTIVE;
 }

-struct device_node *
-omapdss_of_get_next_port(const struct device_node *parent,
-			 struct device_node *prev);
-
-struct device_node *
-omapdss_of_get_next_endpoint(const struct device_node *parent,
-			     struct device_node *prev);
-
-struct device_node *
-omapdss_of_get_first_endpoint(const struct device_node *parent);
-
 struct omap_dss_device *
 omapdss_of_find_source_for_first_ep(struct device_node *node);

diff --git a/drivers/gpu/drm/omapdrm/dss/sdi.c b/drivers/gpu/drm/omapdrm/dss/sdi.c
index b3bda2d3c08d..0620b9f8c231 100644
--- a/drivers/gpu/drm/omapdrm/dss/sdi.c
+++ b/drivers/gpu/drm/omapdrm/dss/sdi.c
@@ -414,7 +414,7 @@ int sdi_init_port(struct platform_device *pdev, struct device_node *port)
 	u32 datapairs;
 	int r;

-	ep = omapdss_of_get_next_endpoint(port, NULL);
+	ep = of_get_next_child(port, NULL);
 	if (!ep)
 		return 0;

diff --git a/drivers/gpu/drm/omapdrm/dss/venc.c b/drivers/gpu/drm/omapdrm/dss/venc.c
index d74f7fcc2e46..19d14957f566 100644
--- a/drivers/gpu/drm/omapdrm/dss/venc.c
+++ b/drivers/gpu/drm/omapdrm/dss/venc.c
@@ -35,6 +35,7 @@
 #include <linux/regulator/consumer.h>
 #include <linux/pm_runtime.h>
 #include <linux/of.h>
+#include <linux/of_graph.h>
 #include <linux/component.h>

 #include "omapdss.h"
@@ -818,7 +819,7 @@ static int venc_probe_of(struct platform_device *pdev)
 	u32 channels;
 	int r;

-	ep = omapdss_of_get_first_endpoint(node);
+	ep = of_graph_get_endpoint_by_regs(node, 0, 0);
 	if (!ep)
 		return 0;

--
2.10.1

[PATCH v2 6/6] drm: omap: use common OF graph helpers

[Rob Herring]

The OMAP driver has its own OF graph helpers that are similar to the
common helpers. This commit replaces most of the calls with the common
helpers. There's still a couple of custom helpers left, but the driver
needs more extensive changes to get rid of them.

In dss_init_ports, we invert the loop, looping through the known ports
and matching them to DT nodes rather than looping thru DT nodes and
matching them to the ports.

Signed-off-by: Rob Herring <robh@kernel.org>
---
v2:
- build fixes in hdmi5 and sdi

 drivers/gpu/drm/omapdrm/dss/dpi.c     |   2 +-
 drivers/gpu/drm/omapdrm/dss/dsi.c     |   3 +-
 drivers/gpu/drm/omapdrm/dss/dss-of.c  | 102 +---------------------------------
 drivers/gpu/drm/omapdrm/dss/dss.c     |  61 +++++---------------
 drivers/gpu/drm/omapdrm/dss/hdmi4.c   |   3 +-
 drivers/gpu/drm/omapdrm/dss/hdmi5.c   |   3 +-
 drivers/gpu/drm/omapdrm/dss/omapdss.h |  11 ----
 drivers/gpu/drm/omapdrm/dss/sdi.c     |   2 +-
 drivers/gpu/drm/omapdrm/dss/venc.c    |   3 +-
 9 files changed, 26 insertions(+), 164 deletions(-)

diff --git a/drivers/gpu/drm/omapdrm/dss/dpi.c b/drivers/gpu/drm/omapdrm/dss/dpi.c
index e75162d26ac0..e5bb494d4689 100644
--- a/drivers/gpu/drm/omapdrm/dss/dpi.c
+++ b/drivers/gpu/drm/omapdrm/dss/dpi.c
@@ -855,7 +855,7 @@ int dpi_init_port(struct platform_device *pdev, struct device_node *port)
 	if (!dpi)
 		return -ENOMEM;

-	ep = omapdss_of_get_next_endpoint(port, NULL);
+	ep = of_get_next_child(port, NULL);
 	if (!ep)
 		return 0;

diff --git a/drivers/gpu/drm/omapdrm/dss/dsi.c b/drivers/gpu/drm/omapdrm/dss/dsi.c
index f060bda31235..d63e240513f1 100644
--- a/drivers/gpu/drm/omapdrm/dss/dsi.c
+++ b/drivers/gpu/drm/omapdrm/dss/dsi.c
@@ -39,6 +39,7 @@
 #include <linux/debugfs.h>
 #include <linux/pm_runtime.h>
 #include <linux/of.h>
+#include <linux/of_graph.h>
 #include <linux/of_platform.h>
 #include <linux/component.h>

@@ -5091,7 +5092,7 @@ static int dsi_probe_of(struct platform_device *pdev)
 	struct device_node *ep;
 	struct omap_dsi_pin_config pin_cfg;

-	ep = omapdss_of_get_first_endpoint(node);
+	ep = of_graph_get_endpoint_by_regs(node, 0, 0);
 	if (!ep)
 		return 0;

diff --git a/drivers/gpu/drm/omapdrm/dss/dss-of.c b/drivers/gpu/drm/omapdrm/dss/dss-of.c
index dfd4e9621e3b..eb520ab45ddd 100644
--- a/drivers/gpu/drm/omapdrm/dss/dss-of.c
+++ b/drivers/gpu/drm/omapdrm/dss/dss-of.c
@@ -16,77 +16,12 @@
 #include <linux/err.h>
 #include <linux/module.h>
 #include <linux/of.h>
+#include <linux/of_graph.h>
 #include <linux/seq_file.h>

 #include "omapdss.h"
 #include "dss.h"

-struct device_node *
-omapdss_of_get_next_port(const struct device_node *parent,
-			 struct device_node *prev)
-{
-	struct device_node *port = NULL;
-
-	if (!parent)
-		return NULL;
-
-	if (!prev) {
-		struct device_node *ports;
-		/*
-		 * It's the first call, we have to find a port subnode
-		 * within this node or within an optional 'ports' node.
-		 */
-		ports = of_get_child_by_name(parent, "ports");
-		if (ports)
-			parent = ports;
-
-		port = of_get_child_by_name(parent, "port");
-
-		/* release the 'ports' node */
-		of_node_put(ports);
-	} else {
-		struct device_node *ports;
-
-		ports = of_get_parent(prev);
-		if (!ports)
-			return NULL;
-
-		do {
-			port = of_get_next_child(ports, prev);
-			if (!port) {
-				of_node_put(ports);
-				return NULL;
-			}
-			prev = port;
-		} while (of_node_cmp(port->name, "port") != 0);
-
-		of_node_put(ports);
-	}
-
-	return port;
-}
-EXPORT_SYMBOL_GPL(omapdss_of_get_next_port);
-
-struct device_node *
-omapdss_of_get_next_endpoint(const struct device_node *parent,
-			     struct device_node *prev)
-{
-	struct device_node *ep = NULL;
-
-	if (!parent)
-		return NULL;
-
-	do {
-		ep = of_get_next_child(parent, prev);
-		if (!ep)
-			return NULL;
-		prev = ep;
-	} while (of_node_cmp(ep->name, "endpoint") != 0);
-
-	return ep;
-}
-EXPORT_SYMBOL_GPL(omapdss_of_get_next_endpoint);
-
 struct device_node *dss_of_port_get_parent_device(struct device_node *port)
 {
 	struct device_node *np;
@@ -123,37 +58,6 @@ u32 dss_of_port_get_port_number(struct device_node *port)
 	return reg;
 }

-static struct device_node *omapdss_of_get_remote_port(const struct device_node *node)
-{
-	struct device_node *np;
-
-	np = of_parse_phandle(node, "remote-endpoint", 0);
-	if (!np)
-		return NULL;
-
-	np = of_get_next_parent(np);
-
-	return np;
-}
-
-struct device_node *
-omapdss_of_get_first_endpoint(const struct device_node *parent)
-{
-	struct device_node *port, *ep;
-
-	port = omapdss_of_get_next_port(parent, NULL);
-
-	if (!port)
-		return NULL;
-
-	ep = omapdss_of_get_next_endpoint(port, NULL);
-
-	of_node_put(port);
-
-	return ep;
-}
-EXPORT_SYMBOL_GPL(omapdss_of_get_first_endpoint);
-
 struct omap_dss_device *
 omapdss_of_find_source_for_first_ep(struct device_node *node)
 {
@@ -161,11 +65,11 @@ omapdss_of_find_source_for_first_ep(struct device_node *node)
 	struct device_node *src_port;
 	struct omap_dss_device *src;

-	ep = omapdss_of_get_first_endpoint(node);
+	ep = of_graph_get_endpoint_by_regs(node, 0, 0);
 	if (!ep)
 		return ERR_PTR(-EINVAL);

-	src_port = omapdss_of_get_remote_port(ep);
+	src_port = of_graph_get_remote_port(ep);
 	if (!src_port) {
 		of_node_put(ep);
 		return ERR_PTR(-EINVAL);
diff --git a/drivers/gpu/drm/omapdrm/dss/dss.c b/drivers/gpu/drm/omapdrm/dss/dss.c
index 14887d5b02e5..2734c401d9fa 100644
--- a/drivers/gpu/drm/omapdrm/dss/dss.c
+++ b/drivers/gpu/drm/omapdrm/dss/dss.c
@@ -38,6 +38,7 @@
 #include <linux/mfd/syscon.h>
 #include <linux/regmap.h>
 #include <linux/of.h>
+#include <linux/of_graph.h>
 #include <linux/regulator/consumer.h>
 #include <linux/suspend.h>
 #include <linux/component.h>
@@ -1043,32 +1044,14 @@ static int dss_init_ports(struct platform_device *pdev)
 {
 	struct device_node *parent = pdev->dev.of_node;
 	struct device_node *port;
-	int r;
-
-	if (parent == NULL)
-		return 0;
+	int i;

-	port = omapdss_of_get_next_port(parent, NULL);
-	if (!port)
-		return 0;
-
-	if (dss.feat->num_ports == 0)
-		return 0;
-
-	do {
-		enum omap_display_type port_type;
-		u32 reg;
-
-		r = of_property_read_u32(port, "reg", &reg);
-		if (r)
-			reg = 0;
-
-		if (reg >= dss.feat->num_ports)
+	for (i = 0; i < dss.feat->num_ports; i++) {
+		port = of_graph_get_port_by_id(parent, i);
+		if (!port)
 			continue;

-		port_type = dss.feat->ports[reg];
-
-		switch (port_type) {
+		switch (dss.feat->ports[i]) {
 		case OMAP_DISPLAY_TYPE_DPI:
 			dpi_init_port(pdev, port);
 			break;
@@ -1078,7 +1061,7 @@ static int dss_init_ports(struct platform_device *pdev)
 		default:
 			break;
 		}
-	} while ((port = omapdss_of_get_next_port(parent, port)) != NULL);
+	}

 	return 0;
 }
@@ -1087,32 +1070,14 @@ static void dss_uninit_ports(struct platform_device *pdev)
 {
 	struct device_node *parent = pdev->dev.of_node;
 	struct device_node *port;
+	int i;

-	if (parent == NULL)
-		return;
-
-	port = omapdss_of_get_next_port(parent, NULL);
-	if (!port)
-		return;
-
-	if (dss.feat->num_ports == 0)
-		return;
-
-	do {
-		enum omap_display_type port_type;
-		u32 reg;
-		int r;
-
-		r = of_property_read_u32(port, "reg", &reg);
-		if (r)
-			reg = 0;
-
-		if (reg >= dss.feat->num_ports)
+	for (i = 0; i < dss.feat->num_ports; i++) {
+		port = of_graph_get_port_by_id(parent, i);
+		if (!port)
 			continue;

-		port_type = dss.feat->ports[reg];
-
-		switch (port_type) {
+		switch (dss.feat->ports[i]) {
 		case OMAP_DISPLAY_TYPE_DPI:
 			dpi_uninit_port(port);
 			break;
@@ -1122,7 +1087,7 @@ static void dss_uninit_ports(struct platform_device *pdev)
 		default:
 			break;
 		}
-	} while ((port = omapdss_of_get_next_port(parent, port)) != NULL);
+	}
 }

 static int dss_video_pll_probe(struct platform_device *pdev)
diff --git a/drivers/gpu/drm/omapdrm/dss/hdmi4.c b/drivers/gpu/drm/omapdrm/dss/hdmi4.c
index e7162c16de2e..87c53034c634 100644
--- a/drivers/gpu/drm/omapdrm/dss/hdmi4.c
+++ b/drivers/gpu/drm/omapdrm/dss/hdmi4.c
@@ -34,6 +34,7 @@
 #include <linux/regulator/consumer.h>
 #include <linux/component.h>
 #include <linux/of.h>
+#include <linux/of_graph.h>
 #include <sound/omap-hdmi-audio.h>

 #include "omapdss.h"
@@ -546,7 +547,7 @@ static int hdmi_probe_of(struct platform_device *pdev)
 	struct device_node *ep;
 	int r;

-	ep = omapdss_of_get_first_endpoint(node);
+	ep = of_graph_get_endpoint_by_regs(node, 0, 0);
 	if (!ep)
 		return 0;

diff --git a/drivers/gpu/drm/omapdrm/dss/hdmi5.c b/drivers/gpu/drm/omapdrm/dss/hdmi5.c
index 678dfb02764a..d13dce7e8079 100644
--- a/drivers/gpu/drm/omapdrm/dss/hdmi5.c
+++ b/drivers/gpu/drm/omapdrm/dss/hdmi5.c
@@ -39,6 +39,7 @@
 #include <linux/regulator/consumer.h>
 #include <linux/component.h>
 #include <linux/of.h>
+#include <linux/of_graph.h>
 #include <sound/omap-hdmi-audio.h>

 #include "omapdss.h"
@@ -572,7 +573,7 @@ static int hdmi_probe_of(struct platform_device *pdev)
 	struct device_node *ep;
 	int r;

-	ep = omapdss_of_get_first_endpoint(node);
+	ep = of_graph_get_endpoint_by_regs(node, 0, 0);
 	if (!ep)
 		return 0;

diff --git a/drivers/gpu/drm/omapdrm/dss/omapdss.h b/drivers/gpu/drm/omapdrm/dss/omapdss.h
index b420dde8c0fb..acf4e520baaf 100644
--- a/drivers/gpu/drm/omapdrm/dss/omapdss.h
+++ b/drivers/gpu/drm/omapdrm/dss/omapdss.h
@@ -830,17 +830,6 @@ static inline bool omapdss_device_is_enabled(struct omap_dss_device *dssdev)
 	return dssdev->state == OMAP_DSS_DISPLAY_ACTIVE;
 }

-struct device_node *
-omapdss_of_get_next_port(const struct device_node *parent,
-			 struct device_node *prev);
-
-struct device_node *
-omapdss_of_get_next_endpoint(const struct device_node *parent,
-			     struct device_node *prev);
-
-struct device_node *
-omapdss_of_get_first_endpoint(const struct device_node *parent);
-
 struct omap_dss_device *
 omapdss_of_find_source_for_first_ep(struct device_node *node);

diff --git a/drivers/gpu/drm/omapdrm/dss/sdi.c b/drivers/gpu/drm/omapdrm/dss/sdi.c
index b3bda2d3c08d..0620b9f8c231 100644
--- a/drivers/gpu/drm/omapdrm/dss/sdi.c
+++ b/drivers/gpu/drm/omapdrm/dss/sdi.c
@@ -414,7 +414,7 @@ int sdi_init_port(struct platform_device *pdev, struct device_node *port)
 	u32 datapairs;
 	int r;

-	ep = omapdss_of_get_next_endpoint(port, NULL);
+	ep = of_get_next_child(port, NULL);
 	if (!ep)
 		return 0;

diff --git a/drivers/gpu/drm/omapdrm/dss/venc.c b/drivers/gpu/drm/omapdrm/dss/venc.c
index d74f7fcc2e46..19d14957f566 100644
--- a/drivers/gpu/drm/omapdrm/dss/venc.c
+++ b/drivers/gpu/drm/omapdrm/dss/venc.c
@@ -35,6 +35,7 @@
 #include <linux/regulator/consumer.h>
 #include <linux/pm_runtime.h>
 #include <linux/of.h>
+#include <linux/of_graph.h>
 #include <linux/component.h>

 #include "omapdss.h"
@@ -818,7 +819,7 @@ static int venc_probe_of(struct platform_device *pdev)
 	u32 channels;
 	int r;

-	ep = omapdss_of_get_first_endpoint(node);
+	ep = of_graph_get_endpoint_by_regs(node, 0, 0);
 	if (!ep)
 		return 0;

--
2.10.1

Re: [PATCH v2 4/6] drm: convert drivers to use of_graph_get_remote_node

[Hoegeun Kwon]

> diff --git a/drivers/gpu/drm/exynos/exynos_drm_mic.c b/drivers/gpu/drm/exynos/exynos_drm_mic.c
> index a0def0be6d65..93ebb12133e1 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_mic.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_mic.c
> @@ -228,29 +228,6 @@ static void mic_set_reg_on(struct exynos_mic *mic, bool enable)
>   	writel(reg, mic->reg + MIC_OP);
>   }
>
> -static struct device_node *get_remote_node(struct device_node *from, int reg)
> -{
> -	struct device_node *endpoint = NULL, *remote_node = NULL;
> -
> -	endpoint = of_graph_get_endpoint_by_regs(from, reg, -1);
> -	if (!endpoint) {
> -		DRM_ERROR("mic: Failed to find remote port from %s",
> -				from->full_name);
> -		goto exit;
> -	}
> -
> -	remote_node = of_graph_get_remote_port_parent(endpoint);
> -	if (!remote_node) {
> -		DRM_ERROR("mic: Failed to find remote port parent from %s",
> -							from->full_name);
> -		goto exit;
> -	}
> -
> -exit:
> -	of_node_put(endpoint);
> -	return remote_node;
> -}
> -
>   static int parse_dt(struct exynos_mic *mic)
>   {
>   	int ret = 0, i, j;
> @@ -262,7 +239,7 @@ static int parse_dt(struct exynos_mic *mic)
>   	 * The first node must be for decon and the second one must be for dsi.
>   	 */
>   	for (i = 0, j = 0; i < NUM_ENDPOINTS; i++) {
> -		remote_node = get_remote_node(mic->dev->of_node, i);
> +		remote_node = of_graph_get_remote_node(mic->dev->of_node, i, 0);
>   		if (!remote_node) {
>   			ret = -EPIPE;
>   			goto exit;
> @@ -279,7 +256,7 @@ static int parse_dt(struct exynos_mic *mic)
>   			break;
>   		case ENDPOINT_DSI_NODE:

Dear Rob,

I have tested this patch, rebase these patches on samsung soc tree[1]
and drm exynos tree[2]. But 4/6 patch can not be applied. Because
there is a conflict with the already merged [3] patch.

Best Regards,
Hoegeun

[1] https://git.kernel.org/cgit/linux/kernel/git/krzk/linux.git/ 
(for-next branch)
[2] https://git.kernel.org/cgit/linux/kernel/git/daeinki/drm-exynos.git/ 
(exynos_drm_next branch)
[3] drm/exynos: mic: Fix parse_dt function (cc2b0225)

>   			/* panel node */
> -			remote_node = get_remote_node(remote_node, 1);
> +			remote_node = of_graph_get_remote_node(remote_node, 1, 0);
>   			if (!remote_node) {
>   				ret = -EPIPE;
>   				goto exit;
> diff --git a/drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c b/drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c
> index ebd5f4fe4c23..18d6570e057d 100644
> --- a/drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c
> +++ b/drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c
> @@ -247,34 +247,6 @@ static const struct component_master_ops kirin_drm_ops = {
>   	.unbind = kirin_drm_unbind,
>   };
>
>

Re: [PATCH v2 4/6] drm: convert drivers to use of_graph_get_remote_node

[Hoegeun Kwon]

> diff --git a/drivers/gpu/drm/exynos/exynos_drm_mic.c b/drivers/gpu/drm/exynos/exynos_drm_mic.c
> index a0def0be6d65..93ebb12133e1 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_mic.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_mic.c
> @@ -228,29 +228,6 @@ static void mic_set_reg_on(struct exynos_mic *mic, bool enable)
>   	writel(reg, mic->reg + MIC_OP);
>   }
>
> -static struct device_node *get_remote_node(struct device_node *from, int reg)
> -{
> -	struct device_node *endpoint = NULL, *remote_node = NULL;
> -
> -	endpoint = of_graph_get_endpoint_by_regs(from, reg, -1);
> -	if (!endpoint) {
> -		DRM_ERROR("mic: Failed to find remote port from %s",
> -				from->full_name);
> -		goto exit;
> -	}
> -
> -	remote_node = of_graph_get_remote_port_parent(endpoint);
> -	if (!remote_node) {
> -		DRM_ERROR("mic: Failed to find remote port parent from %s",
> -							from->full_name);
> -		goto exit;
> -	}
> -
> -exit:
> -	of_node_put(endpoint);
> -	return remote_node;
> -}
> -
>   static int parse_dt(struct exynos_mic *mic)
>   {
>   	int ret = 0, i, j;
> @@ -262,7 +239,7 @@ static int parse_dt(struct exynos_mic *mic)
>   	 * The first node must be for decon and the second one must be for dsi.
>   	 */
>   	for (i = 0, j = 0; i < NUM_ENDPOINTS; i++) {
> -		remote_node = get_remote_node(mic->dev->of_node, i);
> +		remote_node = of_graph_get_remote_node(mic->dev->of_node, i, 0);
>   		if (!remote_node) {
>   			ret = -EPIPE;
>   			goto exit;
> @@ -279,7 +256,7 @@ static int parse_dt(struct exynos_mic *mic)
>   			break;
>   		case ENDPOINT_DSI_NODE:

Dear Rob,

I have tested this patch, rebase these patches on samsung soc tree[1]
and drm exynos tree[2]. But 4/6 patch can not be applied. Because
there is a conflict with the already merged [3] patch.

Best Regards,
Hoegeun

[1] https://git.kernel.org/cgit/linux/kernel/git/krzk/linux.git/ 
(for-next branch)
[2] https://git.kernel.org/cgit/linux/kernel/git/daeinki/drm-exynos.git/ 
(exynos_drm_next branch)
[3] drm/exynos: mic: Fix parse_dt function (cc2b0225)

>   			/* panel node */
> -			remote_node = get_remote_node(remote_node, 1);
> +			remote_node = of_graph_get_remote_node(remote_node, 1, 0);
>   			if (!remote_node) {
>   				ret = -EPIPE;
>   				goto exit;
> diff --git a/drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c b/drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c
> index ebd5f4fe4c23..18d6570e057d 100644
> --- a/drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c
> +++ b/drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c
> @@ -247,34 +247,6 @@ static const struct component_master_ops kirin_drm_ops = {
>   	.unbind = kirin_drm_unbind,
>   };
>
>

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Re: [PATCH v2 4/6] drm: convert drivers to use of_graph_get_remote_node

[Archit Taneja]

On 02/10/2017 12:35 AM, Rob Herring wrote:
> Convert drivers to use the new of_graph_get_remote_node() helper
> instead of parsing the endpoint node and then getting the remote device
> node. Now drivers can just specify the device node and which
> port/endpoint and get back the connected remote device node. The details
> of the graph binding are nicely abstracted into the core OF graph code.
>
> This changes some error messages to debug messages (in the graph core).
> Graph connections are often "no connects" depending on the particular
> board, so we want to avoid spurious messages. Plus the kernel is not a
> DT validator.

For the msm and adv75xx driver:

Tested by: Archit Taneja <architt@codeaurora.org>

>
> Signed-off-by: Rob Herring <robh@kernel.org>
> Acked-by: Neil Armstrong <narmstrong@baylibre.com>
> Acked-by: Philipp Zabel <p.zabel@pengutronix.de>
> Tested-by: Liviu Dudau <liviu.dudau@arm.com>
> Tested-by: Eric Anholt <eric@anholt.net>
> ---
> v2:
> - tilcdc fix (Jyri Sarha)
> - Dropped an incomplete meson change.
>
>  drivers/gpu/drm/arm/hdlcd_drv.c                 | 22 ++------
>  drivers/gpu/drm/arm/malidp_drv.c                | 28 ++--------
>  drivers/gpu/drm/bridge/adv7511/adv7533.c        | 12 +----
>  drivers/gpu/drm/bridge/dumb-vga-dac.c           | 15 ++----
>  drivers/gpu/drm/bridge/ti-tfp410.c              | 15 ++----
>  drivers/gpu/drm/exynos/exynos_drm_dpi.c         | 16 +-----
>  drivers/gpu/drm/exynos/exynos_drm_dsi.c         | 13 ++---
>  drivers/gpu/drm/exynos/exynos_drm_mic.c         | 27 +---------
>  drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c | 30 +----------
>  drivers/gpu/drm/mediatek/mtk_dpi.c              | 12 ++---
>  drivers/gpu/drm/mediatek/mtk_hdmi.c             | 26 ++--------
>  drivers/gpu/drm/meson/meson_venc_cvbs.c         | 19 ++-----
>  drivers/gpu/drm/msm/dsi/dsi_host.c              |  3 +-
>  drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c         | 28 +---------
>  drivers/gpu/drm/rockchip/rockchip_drm_drv.c     | 18 +++----
>  drivers/gpu/drm/tilcdc/tilcdc_crtc.c            | 12 +----
>  drivers/gpu/drm/tilcdc/tilcdc_external.c        | 68 +++----------------------
>  drivers/gpu/drm/vc4/vc4_dpi.c                   | 15 ++----
>  18 files changed, 55 insertions(+), 324 deletions(-)
>
> diff --git a/drivers/gpu/drm/arm/hdlcd_drv.c b/drivers/gpu/drm/arm/hdlcd_drv.c
> index e5f4f4a6546d..0f70f5fe9970 100644
> --- a/drivers/gpu/drm/arm/hdlcd_drv.c
> +++ b/drivers/gpu/drm/arm/hdlcd_drv.c
> @@ -430,29 +430,13 @@ static int compare_dev(struct device *dev, void *data)
>
>  static int hdlcd_probe(struct platform_device *pdev)
>  {
> -	struct device_node *port, *ep;
> +	struct device_node *port;
>  	struct component_match *match = NULL;
>
> -	if (!pdev->dev.of_node)
> -		return -ENODEV;
> -
>  	/* there is only one output port inside each device, find it */
> -	ep = of_graph_get_next_endpoint(pdev->dev.of_node, NULL);
> -	if (!ep)
> -		return -ENODEV;
> -
> -	if (!of_device_is_available(ep)) {
> -		of_node_put(ep);
> +	port = of_graph_get_remote_node(pdev->dev.of_node, 0, 0);
> +	if (!port)
>  		return -ENODEV;
> -	}
> -
> -	/* add the remote encoder port as component */
> -	port = of_graph_get_remote_port_parent(ep);
> -	of_node_put(ep);
> -	if (!port || !of_device_is_available(port)) {
> -		of_node_put(port);
> -		return -EAGAIN;
> -	}
>
>  	drm_of_component_match_add(&pdev->dev, &match, compare_dev, port);
>  	of_node_put(port);
> diff --git a/drivers/gpu/drm/arm/malidp_drv.c b/drivers/gpu/drm/arm/malidp_drv.c
> index 32f746e31379..47b552f1337c 100644
> --- a/drivers/gpu/drm/arm/malidp_drv.c
> +++ b/drivers/gpu/drm/arm/malidp_drv.c
> @@ -262,7 +262,6 @@ static int malidp_bind(struct device *dev)
>  {
>  	struct resource *res;
>  	struct drm_device *drm;
> -	struct device_node *ep;
>  	struct malidp_drm *malidp;
>  	struct malidp_hw_device *hwdev;
>  	struct platform_device *pdev = to_platform_device(dev);
> @@ -360,12 +359,7 @@ static int malidp_bind(struct device *dev)
>  		goto init_fail;
>
>  	/* Set the CRTC's port so that the encoder component can find it */
> -	ep = of_graph_get_next_endpoint(dev->of_node, NULL);
> -	if (!ep) {
> -		ret = -EINVAL;
> -		goto port_fail;
> -	}
> -	malidp->crtc.port = of_get_next_parent(ep);
> +	malidp->crtc.port = of_graph_get_port_by_id(dev->of_node, 0);
>
>  	ret = component_bind_all(dev, drm);
>  	if (ret) {
> @@ -420,7 +414,6 @@ static int malidp_bind(struct device *dev)
>  bind_fail:
>  	of_node_put(malidp->crtc.port);
>  	malidp->crtc.port = NULL;
> -port_fail:
>  	malidp_fini(drm);
>  init_fail:
>  	drm->dev_private = NULL;
> @@ -478,29 +471,16 @@ static int malidp_compare_dev(struct device *dev, void *data)
>
>  static int malidp_platform_probe(struct platform_device *pdev)
>  {
> -	struct device_node *port, *ep;
> +	struct device_node *port;
>  	struct component_match *match = NULL;
>
>  	if (!pdev->dev.of_node)
>  		return -ENODEV;
>
>  	/* there is only one output port inside each device, find it */
> -	ep = of_graph_get_next_endpoint(pdev->dev.of_node, NULL);
> -	if (!ep)
> -		return -ENODEV;
> -
> -	if (!of_device_is_available(ep)) {
> -		of_node_put(ep);
> +	port = of_graph_get_remote_node(pdev->dev.of_node, 0, 0);
> +	if (!port)
>  		return -ENODEV;
> -	}
> -
> -	/* add the remote encoder port as component */
> -	port = of_graph_get_remote_port_parent(ep);
> -	of_node_put(ep);
> -	if (!port || !of_device_is_available(port)) {
> -		of_node_put(port);
> -		return -EAGAIN;
> -	}
>
>  	drm_of_component_match_add(&pdev->dev, &match, malidp_compare_dev,
>  				   port);
> diff --git a/drivers/gpu/drm/bridge/adv7511/adv7533.c b/drivers/gpu/drm/bridge/adv7511/adv7533.c
> index 8b210373cfa2..ac804f81e2f6 100644
> --- a/drivers/gpu/drm/bridge/adv7511/adv7533.c
> +++ b/drivers/gpu/drm/bridge/adv7511/adv7533.c
> @@ -232,7 +232,6 @@ void adv7533_detach_dsi(struct adv7511 *adv)
>  int adv7533_parse_dt(struct device_node *np, struct adv7511 *adv)
>  {
>  	u32 num_lanes;
> -	struct device_node *endpoint;
>
>  	of_property_read_u32(np, "adi,dsi-lanes", &num_lanes);
>
> @@ -241,17 +240,10 @@ int adv7533_parse_dt(struct device_node *np, struct adv7511 *adv)
>
>  	adv->num_dsi_lanes = num_lanes;
>
> -	endpoint = of_graph_get_next_endpoint(np, NULL);
> -	if (!endpoint)
> +	adv->host_node = of_graph_get_remote_node(np, 0, 0);
> +	if (!adv->host_node)
>  		return -ENODEV;
>
> -	adv->host_node = of_graph_get_remote_port_parent(endpoint);
> -	if (!adv->host_node) {
> -		of_node_put(endpoint);
> -		return -ENODEV;
> -	}
> -
> -	of_node_put(endpoint);
>  	of_node_put(adv->host_node);
>
>  	adv->use_timing_gen = !of_property_read_bool(np,
> diff --git a/drivers/gpu/drm/bridge/dumb-vga-dac.c b/drivers/gpu/drm/bridge/dumb-vga-dac.c
> index e5706981c934..47b4c99162ad 100644
> --- a/drivers/gpu/drm/bridge/dumb-vga-dac.c
> +++ b/drivers/gpu/drm/bridge/dumb-vga-dac.c
> @@ -154,21 +154,12 @@ static const struct drm_bridge_funcs dumb_vga_bridge_funcs = {
>
>  static struct i2c_adapter *dumb_vga_retrieve_ddc(struct device *dev)
>  {
> -	struct device_node *end_node, *phandle, *remote;
> +	struct device_node *phandle, *remote;
>  	struct i2c_adapter *ddc;
>
> -	end_node = of_graph_get_endpoint_by_regs(dev->of_node, 1, -1);
> -	if (!end_node) {
> -		dev_err(dev, "Missing connector endpoint\n");
> -		return ERR_PTR(-ENODEV);
> -	}
> -
> -	remote = of_graph_get_remote_port_parent(end_node);
> -	of_node_put(end_node);
> -	if (!remote) {
> -		dev_err(dev, "Enable to parse remote node\n");
> +	remote = of_graph_get_remote_node(dev->of_node, 1, -1);
> +	if (!remote)
>  		return ERR_PTR(-EINVAL);
> -	}
>
>  	phandle = of_parse_phandle(remote, "ddc-i2c-bus", 0);
>  	of_node_put(remote);
> diff --git a/drivers/gpu/drm/bridge/ti-tfp410.c b/drivers/gpu/drm/bridge/ti-tfp410.c
> index b054ea349952..82a6bdbf6ad0 100644
> --- a/drivers/gpu/drm/bridge/ti-tfp410.c
> +++ b/drivers/gpu/drm/bridge/ti-tfp410.c
> @@ -127,18 +127,13 @@ static const struct drm_bridge_funcs tfp410_bridge_funcs = {
>
>  static int tfp410_get_connector_ddc(struct tfp410 *dvi)
>  {
> -	struct device_node *ep = NULL, *connector_node = NULL;
> -	struct device_node *ddc_phandle = NULL;
> +	struct device_node *connector_node, *ddc_phandle;
>  	int ret = 0;
>
>  	/* port@1 is the connector node */
> -	ep = of_graph_get_endpoint_by_regs(dvi->dev->of_node, 1, -1);
> -	if (!ep)
> -		goto fail;
> -
> -	connector_node = of_graph_get_remote_port_parent(ep);
> +	connector_node = of_graph_get_remote_node(dvi->dev->of_node, 1, -1);
>  	if (!connector_node)
> -		goto fail;
> +		return -ENODEV;
>
>  	ddc_phandle = of_parse_phandle(connector_node, "ddc-i2c-bus", 0);
>  	if (!ddc_phandle)
> @@ -150,10 +145,10 @@ static int tfp410_get_connector_ddc(struct tfp410 *dvi)
>  	else
>  		ret = -EPROBE_DEFER;
>
> +	of_node_put(ddc_phandle);
> +
>  fail:
> -	of_node_put(ep);
>  	of_node_put(connector_node);
> -	of_node_put(ddc_phandle);
>  	return ret;
>  }
>
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_dpi.c b/drivers/gpu/drm/exynos/exynos_drm_dpi.c
> index ad6b73c7fc59..eea529cea19a 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_dpi.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_dpi.c
> @@ -164,27 +164,13 @@ enum {
>  	FIMD_PORT_WRB,
>  };
>
> -static struct device_node *exynos_dpi_of_find_panel_node(struct device *dev)
> -{
> -	struct device_node *np, *ep;
> -
> -	ep = of_graph_get_endpoint_by_regs(dev->of_node, FIMD_PORT_RGB, 0);
> -	if (!ep)
> -		return NULL;
> -
> -	np = of_graph_get_remote_port_parent(ep);
> -	of_node_put(ep);
> -
> -	return np;
> -}
> -
>  static int exynos_dpi_parse_dt(struct exynos_dpi *ctx)
>  {
>  	struct device *dev = ctx->dev;
>  	struct device_node *dn = dev->of_node;
>  	struct device_node *np;
>
> -	ctx->panel_node = exynos_dpi_of_find_panel_node(dev);
> +	ctx->panel_node = of_graph_get_remote_node(dn, FIMD_PORT_RGB, 0);
>
>  	np = of_get_child_by_name(dn, "display-timings");
>  	if (np) {
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_dsi.c b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
> index e07cb1fe4860..04528f512c91 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_dsi.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
> @@ -1670,17 +1670,10 @@ static int exynos_dsi_parse_dt(struct exynos_dsi *dsi)
>
>  	of_node_put(ep);
>
> -	ep = of_graph_get_next_endpoint(node, NULL);
> -	if (!ep) {
> -		ret = -EINVAL;
> -		goto end;
> -	}
> +	dsi->bridge_node = of_graph_get_remote_node(node, DSI_PORT_OUT, 0);
> +	if (!dsi->bridge_node)
> +		return -EINVAL;
>
> -	dsi->bridge_node = of_graph_get_remote_port_parent(ep);
> -	if (!dsi->bridge_node) {
> -		ret = -EINVAL;
> -		goto end;
> -	}
>  end:
>  	of_node_put(ep);
>
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_mic.c b/drivers/gpu/drm/exynos/exynos_drm_mic.c
> index a0def0be6d65..93ebb12133e1 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_mic.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_mic.c
> @@ -228,29 +228,6 @@ static void mic_set_reg_on(struct exynos_mic *mic, bool enable)
>  	writel(reg, mic->reg + MIC_OP);
>  }
>
> -static struct device_node *get_remote_node(struct device_node *from, int reg)
> -{
> -	struct device_node *endpoint = NULL, *remote_node = NULL;
> -
> -	endpoint = of_graph_get_endpoint_by_regs(from, reg, -1);
> -	if (!endpoint) {
> -		DRM_ERROR("mic: Failed to find remote port from %s",
> -				from->full_name);
> -		goto exit;
> -	}
> -
> -	remote_node = of_graph_get_remote_port_parent(endpoint);
> -	if (!remote_node) {
> -		DRM_ERROR("mic: Failed to find remote port parent from %s",
> -							from->full_name);
> -		goto exit;
> -	}
> -
> -exit:
> -	of_node_put(endpoint);
> -	return remote_node;
> -}
> -
>  static int parse_dt(struct exynos_mic *mic)
>  {
>  	int ret = 0, i, j;
> @@ -262,7 +239,7 @@ static int parse_dt(struct exynos_mic *mic)
>  	 * The first node must be for decon and the second one must be for dsi.
>  	 */
>  	for (i = 0, j = 0; i < NUM_ENDPOINTS; i++) {
> -		remote_node = get_remote_node(mic->dev->of_node, i);
> +		remote_node = of_graph_get_remote_node(mic->dev->of_node, i, 0);
>  		if (!remote_node) {
>  			ret = -EPIPE;
>  			goto exit;
> @@ -279,7 +256,7 @@ static int parse_dt(struct exynos_mic *mic)
>  			break;
>  		case ENDPOINT_DSI_NODE:
>  			/* panel node */
> -			remote_node = get_remote_node(remote_node, 1);
> +			remote_node = of_graph_get_remote_node(remote_node, 1, 0);
>  			if (!remote_node) {
>  				ret = -EPIPE;
>  				goto exit;
> diff --git a/drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c b/drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c
> index ebd5f4fe4c23..18d6570e057d 100644
> --- a/drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c
> +++ b/drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c
> @@ -247,34 +247,6 @@ static const struct component_master_ops kirin_drm_ops = {
>  	.unbind = kirin_drm_unbind,
>  };
>
> -static struct device_node *kirin_get_remote_node(struct device_node *np)
> -{
> -	struct device_node *endpoint, *remote;
> -
> -	/* get the first endpoint, in our case only one remote node
> -	 * is connected to display controller.
> -	 */
> -	endpoint = of_graph_get_next_endpoint(np, NULL);
> -	if (!endpoint) {
> -		DRM_ERROR("no valid endpoint node\n");
> -		return ERR_PTR(-ENODEV);
> -	}
> -
> -	remote = of_graph_get_remote_port_parent(endpoint);
> -	of_node_put(endpoint);
> -	if (!remote) {
> -		DRM_ERROR("no valid remote node\n");
> -		return ERR_PTR(-ENODEV);
> -	}
> -
> -	if (!of_device_is_available(remote)) {
> -		DRM_ERROR("not available for remote node\n");
> -		return ERR_PTR(-ENODEV);
> -	}
> -
> -	return remote;
> -}
> -
>  static int kirin_drm_platform_probe(struct platform_device *pdev)
>  {
>  	struct device *dev = &pdev->dev;
> @@ -288,7 +260,7 @@ static int kirin_drm_platform_probe(struct platform_device *pdev)
>  		return -EINVAL;
>  	}
>
> -	remote = kirin_get_remote_node(np);
> +	remote = of_graph_get_remote_node(np, 0, 0);
>  	if (IS_ERR(remote))
>  		return PTR_ERR(remote);
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c b/drivers/gpu/drm/mediatek/mtk_dpi.c
> index 90fb831ef031..dbd554c09a39 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dpi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
> @@ -661,7 +661,7 @@ static int mtk_dpi_probe(struct platform_device *pdev)
>  	struct device *dev = &pdev->dev;
>  	struct mtk_dpi *dpi;
>  	struct resource *mem;
> -	struct device_node *ep, *bridge_node = NULL;
> +	struct device_node *bridge_node;
>  	int comp_id;
>  	int ret;
>
> @@ -706,15 +706,9 @@ static int mtk_dpi_probe(struct platform_device *pdev)
>  		return -EINVAL;
>  	}
>
> -	ep = of_graph_get_next_endpoint(dev->of_node, NULL);
> -	if (ep) {
> -		bridge_node = of_graph_get_remote_port_parent(ep);
> -		of_node_put(ep);
> -	}
> -	if (!bridge_node) {
> -		dev_err(dev, "Failed to find bridge node\n");
> +	bridge_node = of_graph_get_remote_node(dev->of_node, 0, 0);
> +	if (!bridge_node)
>  		return -ENODEV;
> -	}
>
>  	dev_info(dev, "Found bridge node: %s\n", bridge_node->full_name);
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.c b/drivers/gpu/drm/mediatek/mtk_hdmi.c
> index 0e8c4d9af340..f14e472812ce 100644
> --- a/drivers/gpu/drm/mediatek/mtk_hdmi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_hdmi.c
> @@ -1433,7 +1433,7 @@ static int mtk_hdmi_dt_parse_pdata(struct mtk_hdmi *hdmi,
>  {
>  	struct device *dev = &pdev->dev;
>  	struct device_node *np = dev->of_node;
> -	struct device_node *cec_np, *port, *ep, *remote, *i2c_np;
> +	struct device_node *cec_np, *remote, *i2c_np;
>  	struct platform_device *cec_pdev;
>  	struct regmap *regmap;
>  	struct resource *mem;
> @@ -1485,29 +1485,9 @@ static int mtk_hdmi_dt_parse_pdata(struct mtk_hdmi *hdmi,
>  	if (IS_ERR(hdmi->regs))
>  		return PTR_ERR(hdmi->regs);
>
> -	port = of_graph_get_port_by_id(np, 1);
> -	if (!port) {
> -		dev_err(dev, "Missing output port node\n");
> +	remote = of_graph_get_remote_node(np, 1, 0);
> +	if (!remote)
>  		return -EINVAL;
> -	}
> -
> -	ep = of_get_child_by_name(port, "endpoint");
> -	if (!ep) {
> -		dev_err(dev, "Missing endpoint node in port %s\n",
> -			port->full_name);
> -		of_node_put(port);
> -		return -EINVAL;
> -	}
> -	of_node_put(port);
> -
> -	remote = of_graph_get_remote_port_parent(ep);
> -	if (!remote) {
> -		dev_err(dev, "Missing connector/bridge node for endpoint %s\n",
> -			ep->full_name);
> -		of_node_put(ep);
> -		return -EINVAL;
> -	}
> -	of_node_put(ep);
>
>  	if (!of_device_is_compatible(remote, "hdmi-connector")) {
>  		hdmi->bridge.next = of_drm_find_bridge(remote);
> diff --git a/drivers/gpu/drm/meson/meson_venc_cvbs.c b/drivers/gpu/drm/meson/meson_venc_cvbs.c
> index a2bcc70a03ef..8566de2edb62 100644
> --- a/drivers/gpu/drm/meson/meson_venc_cvbs.c
> +++ b/drivers/gpu/drm/meson/meson_venc_cvbs.c
> @@ -217,25 +217,14 @@ static const struct drm_encoder_helper_funcs
>
>  static bool meson_venc_cvbs_connector_is_available(struct meson_drm *priv)
>  {
> -	struct device_node *ep, *remote;
> +	struct device_node *remote;
>
> -	/* CVBS VDAC output is on the first port, first endpoint */
> -	ep = of_graph_get_endpoint_by_regs(priv->dev->of_node, 0, 0);
> -	if (!ep)
> +	remote = of_graph_get_remote_node(priv->dev->of_node, 0, 0);
> +	if (!remote)
>  		return false;
>
> -
> -	/* If the endpoint node exists, consider it enabled */
> -	remote = of_graph_get_remote_port(ep);
> -	if (remote) {
> -		of_node_put(ep);
> -		return true;
> -	}
> -
> -	of_node_put(ep);
>  	of_node_put(remote);
> -
> -	return false;
> +	return true;
>  }
>
>  int meson_venc_cvbs_create(struct meson_drm *priv)
> diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
> index 3819fdefcae2..da8619f9eb2e 100644
> --- a/drivers/gpu/drm/msm/dsi/dsi_host.c
> +++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
> @@ -1637,9 +1637,8 @@ static int dsi_host_parse_dt(struct msm_dsi_host *msm_host)
>  	}
>
>  	/* Get panel node from the output port's endpoint data */
> -	device_node = of_graph_get_remote_port_parent(endpoint);
> +	device_node = of_graph_get_remote_node(np, 1, 0);
>  	if (!device_node) {
> -		dev_err(dev, "%s: no valid device\n", __func__);
>  		ret = -ENODEV;
>  		goto err;
>  	}
> diff --git a/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c b/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c
> index b782efd4b95f..9f36fad1915e 100644
> --- a/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c
> +++ b/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c
> @@ -225,32 +225,6 @@ int mdp4_enable(struct mdp4_kms *mdp4_kms)
>  	return 0;
>  }
>
> -static struct device_node *mdp4_detect_lcdc_panel(struct drm_device *dev)
> -{
> -	struct device_node *endpoint, *panel_node;
> -	struct device_node *np = dev->dev->of_node;
> -
> -	/*
> -	 * LVDS/LCDC is the first port described in the list of ports in the
> -	 * MDP4 DT node.
> -	 */
> -	endpoint = of_graph_get_endpoint_by_regs(np, 0, -1);
> -	if (!endpoint) {
> -		DBG("no LVDS remote endpoint\n");
> -		return NULL;
> -	}
> -
> -	panel_node = of_graph_get_remote_port_parent(endpoint);
> -	if (!panel_node) {
> -		DBG("no valid panel node in LVDS endpoint\n");
> -		of_node_put(endpoint);
> -		return NULL;
> -	}
> -
> -	of_node_put(endpoint);
> -
> -	return panel_node;
> -}
>
>  static int mdp4_modeset_init_intf(struct mdp4_kms *mdp4_kms,
>  				  int intf_type)
> @@ -270,7 +244,7 @@ static int mdp4_modeset_init_intf(struct mdp4_kms *mdp4_kms,
>  		 * bail out early if there is no panel node (no need to
>  		 * initialize LCDC encoder and LVDS connector)
>  		 */
> -		panel_node = mdp4_detect_lcdc_panel(dev);
> +		panel_node = of_graph_get_remote_node(dev->dev->of_node, 0, 0);
>  		if (!panel_node)
>  			return 0;
>
> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
> index 2390c8577617..5e7ccd04ada6 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
> @@ -373,19 +373,13 @@ static void rockchip_add_endpoints(struct device *dev,
>  				   struct component_match **match,
>  				   struct device_node *port)
>  {
> -	struct device_node *ep, *remote;
> +	struct device_node *remote;
> +	int i;
>
> -	for_each_child_of_node(port, ep) {
> -		remote = of_graph_get_remote_port_parent(ep);
> -		if (!remote || !of_device_is_available(remote)) {
> -			of_node_put(remote);
> -			continue;
> -		} else if (!of_device_is_available(remote->parent)) {
> -			dev_warn(dev, "parent device of %s is not available\n",
> -				 remote->full_name);
> -			of_node_put(remote);
> +	for (i = 0; i < 3; i++) {
> +		remote = of_graph_get_remote_node(port, 0, i);
> +		if (!remote)
>  			continue;
> -		}
>
>  		drm_of_component_match_add(dev, match, compare_of, remote);
>  		of_node_put(remote);
> @@ -464,7 +458,7 @@ static int rockchip_drm_platform_probe(struct platform_device *pdev)
>  			continue;
>  		}
>
> -		rockchip_add_endpoints(dev, &match, port);
> +		rockchip_add_endpoints(dev, &match, port->parent);
>  		of_node_put(port);
>  	}
>
> diff --git a/drivers/gpu/drm/tilcdc/tilcdc_crtc.c b/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
> index 6dfdb145f3bb..d67f39e850a8 100644
> --- a/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
> +++ b/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
> @@ -23,6 +23,7 @@
>  #include <linux/workqueue.h>
>  #include <linux/completion.h>
>  #include <linux/dma-mapping.h>
> +#include <linux/of_graph.h>
>
>  #include "tilcdc_drv.h"
>  #include "tilcdc_regs.h"
> @@ -1013,16 +1014,7 @@ int tilcdc_crtc_create(struct drm_device *dev)
>  	drm_crtc_helper_add(crtc, &tilcdc_crtc_helper_funcs);
>
>  	if (priv->is_componentized) {
> -		struct device_node *ports =
> -			of_get_child_by_name(dev->dev->of_node, "ports");
> -
> -		if (ports) {
> -			crtc->port = of_get_child_by_name(ports, "port");
> -			of_node_put(ports);
> -		} else {
> -			crtc->port =
> -				of_get_child_by_name(dev->dev->of_node, "port");
> -		}
> +		crtc->port = of_graph_get_port_by_id(dev->dev->of_node, 0);
>  		if (!crtc->port) { /* This should never happen */
>  			dev_err(dev->dev, "Port node not found in %s\n",
>  				dev->dev->of_node->full_name);
> diff --git a/drivers/gpu/drm/tilcdc/tilcdc_external.c b/drivers/gpu/drm/tilcdc/tilcdc_external.c
> index c67d7cd7d57e..19cf57a6ec76 100644
> --- a/drivers/gpu/drm/tilcdc/tilcdc_external.c
> +++ b/drivers/gpu/drm/tilcdc/tilcdc_external.c
> @@ -187,39 +187,6 @@ int tilcdc_attach_bridge(struct drm_device *ddev, struct drm_bridge *bridge)
>  	return ret;
>  }
>
> -static int tilcdc_node_has_port(struct device_node *dev_node)
> -{
> -	struct device_node *node;
> -
> -	node = of_get_child_by_name(dev_node, "ports");
> -	if (!node)
> -		node = of_get_child_by_name(dev_node, "port");
> -	if (!node)
> -		return 0;
> -	of_node_put(node);
> -
> -	return 1;
> -}
> -
> -static
> -struct device_node *tilcdc_get_remote_node(struct device_node *node)
> -{
> -	struct device_node *ep;
> -	struct device_node *parent;
> -
> -	if (!tilcdc_node_has_port(node))
> -		return NULL;
> -
> -	ep = of_graph_get_next_endpoint(node, NULL);
> -	if (!ep)
> -		return NULL;
> -
> -	parent = of_graph_get_remote_port_parent(ep);
> -	of_node_put(ep);
> -
> -	return parent;
> -}
> -
>  int tilcdc_attach_external_device(struct drm_device *ddev)
>  {
>  	struct tilcdc_drm_private *priv = ddev->dev_private;
> @@ -227,7 +194,7 @@ int tilcdc_attach_external_device(struct drm_device *ddev)
>  	struct drm_bridge *bridge;
>  	int ret;
>
> -	remote_node = tilcdc_get_remote_node(ddev->dev->of_node);
> +	remote_node = of_graph_get_remote_node(ddev->dev->of_node, 0, 0);
>  	if (!remote_node)
>  		return 0;
>
> @@ -266,35 +233,16 @@ int tilcdc_get_external_components(struct device *dev,
>  				   struct component_match **match)
>  {
>  	struct device_node *node;
> -	struct device_node *ep = NULL;
> -	int count = 0;
> -	int ret = 0;
> -
> -	if (!tilcdc_node_has_port(dev->of_node))
> -		return 0;
>
> -	while ((ep = of_graph_get_next_endpoint(dev->of_node, ep))) {
> -		node = of_graph_get_remote_port_parent(ep);
> -		if (!node || !of_device_is_available(node)) {
> -			of_node_put(node);
> -			continue;
> -		}
> -
> -		dev_dbg(dev, "Subdevice node '%s' found\n", node->name);
> -
> -		if (of_device_is_compatible(node, "nxp,tda998x")) {
> -			if (match)
> -				drm_of_component_match_add(dev, match,
> -							   dev_match_of, node);
> -			ret = 1;
> -		}
> +	node = of_graph_get_remote_node(dev->of_node, 0, 0);
>
> +	if (!of_device_is_compatible(node, "nxp,tda998x")) {
>  		of_node_put(node);
> -		if (count++ > 1) {
> -			dev_err(dev, "Only one port is supported\n");
> -			return -EINVAL;
> -		}
> +		return 0;
>  	}
>
> -	return ret;
> +	if (match)
> +		drm_of_component_match_add(dev, match, dev_match_of, node);
> +	of_node_put(node);
> +	return 1;
>  }
> diff --git a/drivers/gpu/drm/vc4/vc4_dpi.c b/drivers/gpu/drm/vc4/vc4_dpi.c
> index 1e1f6b8184d0..ac9655451b25 100644
> --- a/drivers/gpu/drm/vc4/vc4_dpi.c
> +++ b/drivers/gpu/drm/vc4/vc4_dpi.c
> @@ -366,23 +366,14 @@ static const struct of_device_id vc4_dpi_dt_match[] = {
>   */
>  static struct drm_panel *vc4_dpi_get_panel(struct device *dev)
>  {
> -	struct device_node *endpoint, *panel_node;
> +	struct device_node *panel_node;
>  	struct device_node *np = dev->of_node;
>  	struct drm_panel *panel;
>
> -	endpoint = of_graph_get_next_endpoint(np, NULL);
> -	if (!endpoint) {
> -		dev_err(dev, "no endpoint to fetch DPI panel\n");
> -		return NULL;
> -	}
> -
>  	/* don't proceed if we have an endpoint but no panel_node tied to it */
> -	panel_node = of_graph_get_remote_port_parent(endpoint);
> -	of_node_put(endpoint);
> -	if (!panel_node) {
> -		dev_err(dev, "no valid panel node\n");
> +	panel_node = of_graph_get_remote_node(np, 0, 0);
> +	if (!panel_node)
>  		return NULL;
> -	}
>
>  	panel = of_drm_find_panel(panel_node);
>  	of_node_put(panel_node);
> --
> 2.10.1
>

-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project

Re: [PATCH v2 4/6] drm: convert drivers to use of_graph_get_remote_node

[Archit Taneja]

On 02/10/2017 12:35 AM, Rob Herring wrote:
> Convert drivers to use the new of_graph_get_remote_node() helper
> instead of parsing the endpoint node and then getting the remote device
> node. Now drivers can just specify the device node and which
> port/endpoint and get back the connected remote device node. The details
> of the graph binding are nicely abstracted into the core OF graph code.
>
> This changes some error messages to debug messages (in the graph core).
> Graph connections are often "no connects" depending on the particular
> board, so we want to avoid spurious messages. Plus the kernel is not a
> DT validator.

For the msm and adv75xx driver:

Tested by: Archit Taneja <architt-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>

>
> Signed-off-by: Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
> Acked-by: Neil Armstrong <narmstrong-rdvid1DuHRBWk0Htik3J/w@public.gmane.org>
> Acked-by: Philipp Zabel <p.zabel-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
> Tested-by: Liviu Dudau <liviu.dudau-5wv7dgnIgG8@public.gmane.org>
> Tested-by: Eric Anholt <eric-WhKQ6XTQaPysTnJN9+BGXg@public.gmane.org>
> ---
> v2:
> - tilcdc fix (Jyri Sarha)
> - Dropped an incomplete meson change.
>
>  drivers/gpu/drm/arm/hdlcd_drv.c                 | 22 ++------
>  drivers/gpu/drm/arm/malidp_drv.c                | 28 ++--------
>  drivers/gpu/drm/bridge/adv7511/adv7533.c        | 12 +----
>  drivers/gpu/drm/bridge/dumb-vga-dac.c           | 15 ++----
>  drivers/gpu/drm/bridge/ti-tfp410.c              | 15 ++----
>  drivers/gpu/drm/exynos/exynos_drm_dpi.c         | 16 +-----
>  drivers/gpu/drm/exynos/exynos_drm_dsi.c         | 13 ++---
>  drivers/gpu/drm/exynos/exynos_drm_mic.c         | 27 +---------
>  drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c | 30 +----------
>  drivers/gpu/drm/mediatek/mtk_dpi.c              | 12 ++---
>  drivers/gpu/drm/mediatek/mtk_hdmi.c             | 26 ++--------
>  drivers/gpu/drm/meson/meson_venc_cvbs.c         | 19 ++-----
>  drivers/gpu/drm/msm/dsi/dsi_host.c              |  3 +-
>  drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c         | 28 +---------
>  drivers/gpu/drm/rockchip/rockchip_drm_drv.c     | 18 +++----
>  drivers/gpu/drm/tilcdc/tilcdc_crtc.c            | 12 +----
>  drivers/gpu/drm/tilcdc/tilcdc_external.c        | 68 +++----------------------
>  drivers/gpu/drm/vc4/vc4_dpi.c                   | 15 ++----
>  18 files changed, 55 insertions(+), 324 deletions(-)
>
> diff --git a/drivers/gpu/drm/arm/hdlcd_drv.c b/drivers/gpu/drm/arm/hdlcd_drv.c
> index e5f4f4a6546d..0f70f5fe9970 100644
> --- a/drivers/gpu/drm/arm/hdlcd_drv.c
> +++ b/drivers/gpu/drm/arm/hdlcd_drv.c
> @@ -430,29 +430,13 @@ static int compare_dev(struct device *dev, void *data)
>
>  static int hdlcd_probe(struct platform_device *pdev)
>  {
> -	struct device_node *port, *ep;
> +	struct device_node *port;
>  	struct component_match *match = NULL;
>
> -	if (!pdev->dev.of_node)
> -		return -ENODEV;
> -
>  	/* there is only one output port inside each device, find it */
> -	ep = of_graph_get_next_endpoint(pdev->dev.of_node, NULL);
> -	if (!ep)
> -		return -ENODEV;
> -
> -	if (!of_device_is_available(ep)) {
> -		of_node_put(ep);
> +	port = of_graph_get_remote_node(pdev->dev.of_node, 0, 0);
> +	if (!port)
>  		return -ENODEV;
> -	}
> -
> -	/* add the remote encoder port as component */
> -	port = of_graph_get_remote_port_parent(ep);
> -	of_node_put(ep);
> -	if (!port || !of_device_is_available(port)) {
> -		of_node_put(port);
> -		return -EAGAIN;
> -	}
>
>  	drm_of_component_match_add(&pdev->dev, &match, compare_dev, port);
>  	of_node_put(port);
> diff --git a/drivers/gpu/drm/arm/malidp_drv.c b/drivers/gpu/drm/arm/malidp_drv.c
> index 32f746e31379..47b552f1337c 100644
> --- a/drivers/gpu/drm/arm/malidp_drv.c
> +++ b/drivers/gpu/drm/arm/malidp_drv.c
> @@ -262,7 +262,6 @@ static int malidp_bind(struct device *dev)
>  {
>  	struct resource *res;
>  	struct drm_device *drm;
> -	struct device_node *ep;
>  	struct malidp_drm *malidp;
>  	struct malidp_hw_device *hwdev;
>  	struct platform_device *pdev = to_platform_device(dev);
> @@ -360,12 +359,7 @@ static int malidp_bind(struct device *dev)
>  		goto init_fail;
>
>  	/* Set the CRTC's port so that the encoder component can find it */
> -	ep = of_graph_get_next_endpoint(dev->of_node, NULL);
> -	if (!ep) {
> -		ret = -EINVAL;
> -		goto port_fail;
> -	}
> -	malidp->crtc.port = of_get_next_parent(ep);
> +	malidp->crtc.port = of_graph_get_port_by_id(dev->of_node, 0);
>
>  	ret = component_bind_all(dev, drm);
>  	if (ret) {
> @@ -420,7 +414,6 @@ static int malidp_bind(struct device *dev)
>  bind_fail:
>  	of_node_put(malidp->crtc.port);
>  	malidp->crtc.port = NULL;
> -port_fail:
>  	malidp_fini(drm);
>  init_fail:
>  	drm->dev_private = NULL;
> @@ -478,29 +471,16 @@ static int malidp_compare_dev(struct device *dev, void *data)
>
>  static int malidp_platform_probe(struct platform_device *pdev)
>  {
> -	struct device_node *port, *ep;
> +	struct device_node *port;
>  	struct component_match *match = NULL;
>
>  	if (!pdev->dev.of_node)
>  		return -ENODEV;
>
>  	/* there is only one output port inside each device, find it */
> -	ep = of_graph_get_next_endpoint(pdev->dev.of_node, NULL);
> -	if (!ep)
> -		return -ENODEV;
> -
> -	if (!of_device_is_available(ep)) {
> -		of_node_put(ep);
> +	port = of_graph_get_remote_node(pdev->dev.of_node, 0, 0);
> +	if (!port)
>  		return -ENODEV;
> -	}
> -
> -	/* add the remote encoder port as component */
> -	port = of_graph_get_remote_port_parent(ep);
> -	of_node_put(ep);
> -	if (!port || !of_device_is_available(port)) {
> -		of_node_put(port);
> -		return -EAGAIN;
> -	}
>
>  	drm_of_component_match_add(&pdev->dev, &match, malidp_compare_dev,
>  				   port);
> diff --git a/drivers/gpu/drm/bridge/adv7511/adv7533.c b/drivers/gpu/drm/bridge/adv7511/adv7533.c
> index 8b210373cfa2..ac804f81e2f6 100644
> --- a/drivers/gpu/drm/bridge/adv7511/adv7533.c
> +++ b/drivers/gpu/drm/bridge/adv7511/adv7533.c
> @@ -232,7 +232,6 @@ void adv7533_detach_dsi(struct adv7511 *adv)
>  int adv7533_parse_dt(struct device_node *np, struct adv7511 *adv)
>  {
>  	u32 num_lanes;
> -	struct device_node *endpoint;
>
>  	of_property_read_u32(np, "adi,dsi-lanes", &num_lanes);
>
> @@ -241,17 +240,10 @@ int adv7533_parse_dt(struct device_node *np, struct adv7511 *adv)
>
>  	adv->num_dsi_lanes = num_lanes;
>
> -	endpoint = of_graph_get_next_endpoint(np, NULL);
> -	if (!endpoint)
> +	adv->host_node = of_graph_get_remote_node(np, 0, 0);
> +	if (!adv->host_node)
>  		return -ENODEV;
>
> -	adv->host_node = of_graph_get_remote_port_parent(endpoint);
> -	if (!adv->host_node) {
> -		of_node_put(endpoint);
> -		return -ENODEV;
> -	}
> -
> -	of_node_put(endpoint);
>  	of_node_put(adv->host_node);
>
>  	adv->use_timing_gen = !of_property_read_bool(np,
> diff --git a/drivers/gpu/drm/bridge/dumb-vga-dac.c b/drivers/gpu/drm/bridge/dumb-vga-dac.c
> index e5706981c934..47b4c99162ad 100644
> --- a/drivers/gpu/drm/bridge/dumb-vga-dac.c
> +++ b/drivers/gpu/drm/bridge/dumb-vga-dac.c
> @@ -154,21 +154,12 @@ static const struct drm_bridge_funcs dumb_vga_bridge_funcs = {
>
>  static struct i2c_adapter *dumb_vga_retrieve_ddc(struct device *dev)
>  {
> -	struct device_node *end_node, *phandle, *remote;
> +	struct device_node *phandle, *remote;
>  	struct i2c_adapter *ddc;
>
> -	end_node = of_graph_get_endpoint_by_regs(dev->of_node, 1, -1);
> -	if (!end_node) {
> -		dev_err(dev, "Missing connector endpoint\n");
> -		return ERR_PTR(-ENODEV);
> -	}
> -
> -	remote = of_graph_get_remote_port_parent(end_node);
> -	of_node_put(end_node);
> -	if (!remote) {
> -		dev_err(dev, "Enable to parse remote node\n");
> +	remote = of_graph_get_remote_node(dev->of_node, 1, -1);
> +	if (!remote)
>  		return ERR_PTR(-EINVAL);
> -	}
>
>  	phandle = of_parse_phandle(remote, "ddc-i2c-bus", 0);
>  	of_node_put(remote);
> diff --git a/drivers/gpu/drm/bridge/ti-tfp410.c b/drivers/gpu/drm/bridge/ti-tfp410.c
> index b054ea349952..82a6bdbf6ad0 100644
> --- a/drivers/gpu/drm/bridge/ti-tfp410.c
> +++ b/drivers/gpu/drm/bridge/ti-tfp410.c
> @@ -127,18 +127,13 @@ static const struct drm_bridge_funcs tfp410_bridge_funcs = {
>
>  static int tfp410_get_connector_ddc(struct tfp410 *dvi)
>  {
> -	struct device_node *ep = NULL, *connector_node = NULL;
> -	struct device_node *ddc_phandle = NULL;
> +	struct device_node *connector_node, *ddc_phandle;
>  	int ret = 0;
>
>  	/* port@1 is the connector node */
> -	ep = of_graph_get_endpoint_by_regs(dvi->dev->of_node, 1, -1);
> -	if (!ep)
> -		goto fail;
> -
> -	connector_node = of_graph_get_remote_port_parent(ep);
> +	connector_node = of_graph_get_remote_node(dvi->dev->of_node, 1, -1);
>  	if (!connector_node)
> -		goto fail;
> +		return -ENODEV;
>
>  	ddc_phandle = of_parse_phandle(connector_node, "ddc-i2c-bus", 0);
>  	if (!ddc_phandle)
> @@ -150,10 +145,10 @@ static int tfp410_get_connector_ddc(struct tfp410 *dvi)
>  	else
>  		ret = -EPROBE_DEFER;
>
> +	of_node_put(ddc_phandle);
> +
>  fail:
> -	of_node_put(ep);
>  	of_node_put(connector_node);
> -	of_node_put(ddc_phandle);
>  	return ret;
>  }
>
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_dpi.c b/drivers/gpu/drm/exynos/exynos_drm_dpi.c
> index ad6b73c7fc59..eea529cea19a 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_dpi.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_dpi.c
> @@ -164,27 +164,13 @@ enum {
>  	FIMD_PORT_WRB,
>  };
>
> -static struct device_node *exynos_dpi_of_find_panel_node(struct device *dev)
> -{
> -	struct device_node *np, *ep;
> -
> -	ep = of_graph_get_endpoint_by_regs(dev->of_node, FIMD_PORT_RGB, 0);
> -	if (!ep)
> -		return NULL;
> -
> -	np = of_graph_get_remote_port_parent(ep);
> -	of_node_put(ep);
> -
> -	return np;
> -}
> -
>  static int exynos_dpi_parse_dt(struct exynos_dpi *ctx)
>  {
>  	struct device *dev = ctx->dev;
>  	struct device_node *dn = dev->of_node;
>  	struct device_node *np;
>
> -	ctx->panel_node = exynos_dpi_of_find_panel_node(dev);
> +	ctx->panel_node = of_graph_get_remote_node(dn, FIMD_PORT_RGB, 0);
>
>  	np = of_get_child_by_name(dn, "display-timings");
>  	if (np) {
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_dsi.c b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
> index e07cb1fe4860..04528f512c91 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_dsi.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
> @@ -1670,17 +1670,10 @@ static int exynos_dsi_parse_dt(struct exynos_dsi *dsi)
>
>  	of_node_put(ep);
>
> -	ep = of_graph_get_next_endpoint(node, NULL);
> -	if (!ep) {
> -		ret = -EINVAL;
> -		goto end;
> -	}
> +	dsi->bridge_node = of_graph_get_remote_node(node, DSI_PORT_OUT, 0);
> +	if (!dsi->bridge_node)
> +		return -EINVAL;
>
> -	dsi->bridge_node = of_graph_get_remote_port_parent(ep);
> -	if (!dsi->bridge_node) {
> -		ret = -EINVAL;
> -		goto end;
> -	}
>  end:
>  	of_node_put(ep);
>
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_mic.c b/drivers/gpu/drm/exynos/exynos_drm_mic.c
> index a0def0be6d65..93ebb12133e1 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_mic.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_mic.c
> @@ -228,29 +228,6 @@ static void mic_set_reg_on(struct exynos_mic *mic, bool enable)
>  	writel(reg, mic->reg + MIC_OP);
>  }
>
> -static struct device_node *get_remote_node(struct device_node *from, int reg)
> -{
> -	struct device_node *endpoint = NULL, *remote_node = NULL;
> -
> -	endpoint = of_graph_get_endpoint_by_regs(from, reg, -1);
> -	if (!endpoint) {
> -		DRM_ERROR("mic: Failed to find remote port from %s",
> -				from->full_name);
> -		goto exit;
> -	}
> -
> -	remote_node = of_graph_get_remote_port_parent(endpoint);
> -	if (!remote_node) {
> -		DRM_ERROR("mic: Failed to find remote port parent from %s",
> -							from->full_name);
> -		goto exit;
> -	}
> -
> -exit:
> -	of_node_put(endpoint);
> -	return remote_node;
> -}
> -
>  static int parse_dt(struct exynos_mic *mic)
>  {
>  	int ret = 0, i, j;
> @@ -262,7 +239,7 @@ static int parse_dt(struct exynos_mic *mic)
>  	 * The first node must be for decon and the second one must be for dsi.
>  	 */
>  	for (i = 0, j = 0; i < NUM_ENDPOINTS; i++) {
> -		remote_node = get_remote_node(mic->dev->of_node, i);
> +		remote_node = of_graph_get_remote_node(mic->dev->of_node, i, 0);
>  		if (!remote_node) {
>  			ret = -EPIPE;
>  			goto exit;
> @@ -279,7 +256,7 @@ static int parse_dt(struct exynos_mic *mic)
>  			break;
>  		case ENDPOINT_DSI_NODE:
>  			/* panel node */
> -			remote_node = get_remote_node(remote_node, 1);
> +			remote_node = of_graph_get_remote_node(remote_node, 1, 0);
>  			if (!remote_node) {
>  				ret = -EPIPE;
>  				goto exit;
> diff --git a/drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c b/drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c
> index ebd5f4fe4c23..18d6570e057d 100644
> --- a/drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c
> +++ b/drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c
> @@ -247,34 +247,6 @@ static const struct component_master_ops kirin_drm_ops = {
>  	.unbind = kirin_drm_unbind,
>  };
>
> -static struct device_node *kirin_get_remote_node(struct device_node *np)
> -{
> -	struct device_node *endpoint, *remote;
> -
> -	/* get the first endpoint, in our case only one remote node
> -	 * is connected to display controller.
> -	 */
> -	endpoint = of_graph_get_next_endpoint(np, NULL);
> -	if (!endpoint) {
> -		DRM_ERROR("no valid endpoint node\n");
> -		return ERR_PTR(-ENODEV);
> -	}
> -
> -	remote = of_graph_get_remote_port_parent(endpoint);
> -	of_node_put(endpoint);
> -	if (!remote) {
> -		DRM_ERROR("no valid remote node\n");
> -		return ERR_PTR(-ENODEV);
> -	}
> -
> -	if (!of_device_is_available(remote)) {
> -		DRM_ERROR("not available for remote node\n");
> -		return ERR_PTR(-ENODEV);
> -	}
> -
> -	return remote;
> -}
> -
>  static int kirin_drm_platform_probe(struct platform_device *pdev)
>  {
>  	struct device *dev = &pdev->dev;
> @@ -288,7 +260,7 @@ static int kirin_drm_platform_probe(struct platform_device *pdev)
>  		return -EINVAL;
>  	}
>
> -	remote = kirin_get_remote_node(np);
> +	remote = of_graph_get_remote_node(np, 0, 0);
>  	if (IS_ERR(remote))
>  		return PTR_ERR(remote);
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c b/drivers/gpu/drm/mediatek/mtk_dpi.c
> index 90fb831ef031..dbd554c09a39 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dpi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
> @@ -661,7 +661,7 @@ static int mtk_dpi_probe(struct platform_device *pdev)
>  	struct device *dev = &pdev->dev;
>  	struct mtk_dpi *dpi;
>  	struct resource *mem;
> -	struct device_node *ep, *bridge_node = NULL;
> +	struct device_node *bridge_node;
>  	int comp_id;
>  	int ret;
>
> @@ -706,15 +706,9 @@ static int mtk_dpi_probe(struct platform_device *pdev)
>  		return -EINVAL;
>  	}
>
> -	ep = of_graph_get_next_endpoint(dev->of_node, NULL);
> -	if (ep) {
> -		bridge_node = of_graph_get_remote_port_parent(ep);
> -		of_node_put(ep);
> -	}
> -	if (!bridge_node) {
> -		dev_err(dev, "Failed to find bridge node\n");
> +	bridge_node = of_graph_get_remote_node(dev->of_node, 0, 0);
> +	if (!bridge_node)
>  		return -ENODEV;
> -	}
>
>  	dev_info(dev, "Found bridge node: %s\n", bridge_node->full_name);
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.c b/drivers/gpu/drm/mediatek/mtk_hdmi.c
> index 0e8c4d9af340..f14e472812ce 100644
> --- a/drivers/gpu/drm/mediatek/mtk_hdmi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_hdmi.c
> @@ -1433,7 +1433,7 @@ static int mtk_hdmi_dt_parse_pdata(struct mtk_hdmi *hdmi,
>  {
>  	struct device *dev = &pdev->dev;
>  	struct device_node *np = dev->of_node;
> -	struct device_node *cec_np, *port, *ep, *remote, *i2c_np;
> +	struct device_node *cec_np, *remote, *i2c_np;
>  	struct platform_device *cec_pdev;
>  	struct regmap *regmap;
>  	struct resource *mem;
> @@ -1485,29 +1485,9 @@ static int mtk_hdmi_dt_parse_pdata(struct mtk_hdmi *hdmi,
>  	if (IS_ERR(hdmi->regs))
>  		return PTR_ERR(hdmi->regs);
>
> -	port = of_graph_get_port_by_id(np, 1);
> -	if (!port) {
> -		dev_err(dev, "Missing output port node\n");
> +	remote = of_graph_get_remote_node(np, 1, 0);
> +	if (!remote)
>  		return -EINVAL;
> -	}
> -
> -	ep = of_get_child_by_name(port, "endpoint");
> -	if (!ep) {
> -		dev_err(dev, "Missing endpoint node in port %s\n",
> -			port->full_name);
> -		of_node_put(port);
> -		return -EINVAL;
> -	}
> -	of_node_put(port);
> -
> -	remote = of_graph_get_remote_port_parent(ep);
> -	if (!remote) {
> -		dev_err(dev, "Missing connector/bridge node for endpoint %s\n",
> -			ep->full_name);
> -		of_node_put(ep);
> -		return -EINVAL;
> -	}
> -	of_node_put(ep);
>
>  	if (!of_device_is_compatible(remote, "hdmi-connector")) {
>  		hdmi->bridge.next = of_drm_find_bridge(remote);
> diff --git a/drivers/gpu/drm/meson/meson_venc_cvbs.c b/drivers/gpu/drm/meson/meson_venc_cvbs.c
> index a2bcc70a03ef..8566de2edb62 100644
> --- a/drivers/gpu/drm/meson/meson_venc_cvbs.c
> +++ b/drivers/gpu/drm/meson/meson_venc_cvbs.c
> @@ -217,25 +217,14 @@ static const struct drm_encoder_helper_funcs
>
>  static bool meson_venc_cvbs_connector_is_available(struct meson_drm *priv)
>  {
> -	struct device_node *ep, *remote;
> +	struct device_node *remote;
>
> -	/* CVBS VDAC output is on the first port, first endpoint */
> -	ep = of_graph_get_endpoint_by_regs(priv->dev->of_node, 0, 0);
> -	if (!ep)
> +	remote = of_graph_get_remote_node(priv->dev->of_node, 0, 0);
> +	if (!remote)
>  		return false;
>
> -
> -	/* If the endpoint node exists, consider it enabled */
> -	remote = of_graph_get_remote_port(ep);
> -	if (remote) {
> -		of_node_put(ep);
> -		return true;
> -	}
> -
> -	of_node_put(ep);
>  	of_node_put(remote);
> -
> -	return false;
> +	return true;
>  }
>
>  int meson_venc_cvbs_create(struct meson_drm *priv)
> diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
> index 3819fdefcae2..da8619f9eb2e 100644
> --- a/drivers/gpu/drm/msm/dsi/dsi_host.c
> +++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
> @@ -1637,9 +1637,8 @@ static int dsi_host_parse_dt(struct msm_dsi_host *msm_host)
>  	}
>
>  	/* Get panel node from the output port's endpoint data */
> -	device_node = of_graph_get_remote_port_parent(endpoint);
> +	device_node = of_graph_get_remote_node(np, 1, 0);
>  	if (!device_node) {
> -		dev_err(dev, "%s: no valid device\n", __func__);
>  		ret = -ENODEV;
>  		goto err;
>  	}
> diff --git a/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c b/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c
> index b782efd4b95f..9f36fad1915e 100644
> --- a/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c
> +++ b/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c
> @@ -225,32 +225,6 @@ int mdp4_enable(struct mdp4_kms *mdp4_kms)
>  	return 0;
>  }
>
> -static struct device_node *mdp4_detect_lcdc_panel(struct drm_device *dev)
> -{
> -	struct device_node *endpoint, *panel_node;
> -	struct device_node *np = dev->dev->of_node;
> -
> -	/*
> -	 * LVDS/LCDC is the first port described in the list of ports in the
> -	 * MDP4 DT node.
> -	 */
> -	endpoint = of_graph_get_endpoint_by_regs(np, 0, -1);
> -	if (!endpoint) {
> -		DBG("no LVDS remote endpoint\n");
> -		return NULL;
> -	}
> -
> -	panel_node = of_graph_get_remote_port_parent(endpoint);
> -	if (!panel_node) {
> -		DBG("no valid panel node in LVDS endpoint\n");
> -		of_node_put(endpoint);
> -		return NULL;
> -	}
> -
> -	of_node_put(endpoint);
> -
> -	return panel_node;
> -}
>
>  static int mdp4_modeset_init_intf(struct mdp4_kms *mdp4_kms,
>  				  int intf_type)
> @@ -270,7 +244,7 @@ static int mdp4_modeset_init_intf(struct mdp4_kms *mdp4_kms,
>  		 * bail out early if there is no panel node (no need to
>  		 * initialize LCDC encoder and LVDS connector)
>  		 */
> -		panel_node = mdp4_detect_lcdc_panel(dev);
> +		panel_node = of_graph_get_remote_node(dev->dev->of_node, 0, 0);
>  		if (!panel_node)
>  			return 0;
>
> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
> index 2390c8577617..5e7ccd04ada6 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
> @@ -373,19 +373,13 @@ static void rockchip_add_endpoints(struct device *dev,
>  				   struct component_match **match,
>  				   struct device_node *port)
>  {
> -	struct device_node *ep, *remote;
> +	struct device_node *remote;
> +	int i;
>
> -	for_each_child_of_node(port, ep) {
> -		remote = of_graph_get_remote_port_parent(ep);
> -		if (!remote || !of_device_is_available(remote)) {
> -			of_node_put(remote);
> -			continue;
> -		} else if (!of_device_is_available(remote->parent)) {
> -			dev_warn(dev, "parent device of %s is not available\n",
> -				 remote->full_name);
> -			of_node_put(remote);
> +	for (i = 0; i < 3; i++) {
> +		remote = of_graph_get_remote_node(port, 0, i);
> +		if (!remote)
>  			continue;
> -		}
>
>  		drm_of_component_match_add(dev, match, compare_of, remote);
>  		of_node_put(remote);
> @@ -464,7 +458,7 @@ static int rockchip_drm_platform_probe(struct platform_device *pdev)
>  			continue;
>  		}
>
> -		rockchip_add_endpoints(dev, &match, port);
> +		rockchip_add_endpoints(dev, &match, port->parent);
>  		of_node_put(port);
>  	}
>
> diff --git a/drivers/gpu/drm/tilcdc/tilcdc_crtc.c b/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
> index 6dfdb145f3bb..d67f39e850a8 100644
> --- a/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
> +++ b/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
> @@ -23,6 +23,7 @@
>  #include <linux/workqueue.h>
>  #include <linux/completion.h>
>  #include <linux/dma-mapping.h>
> +#include <linux/of_graph.h>
>
>  #include "tilcdc_drv.h"
>  #include "tilcdc_regs.h"
> @@ -1013,16 +1014,7 @@ int tilcdc_crtc_create(struct drm_device *dev)
>  	drm_crtc_helper_add(crtc, &tilcdc_crtc_helper_funcs);
>
>  	if (priv->is_componentized) {
> -		struct device_node *ports =
> -			of_get_child_by_name(dev->dev->of_node, "ports");
> -
> -		if (ports) {
> -			crtc->port = of_get_child_by_name(ports, "port");
> -			of_node_put(ports);
> -		} else {
> -			crtc->port =
> -				of_get_child_by_name(dev->dev->of_node, "port");
> -		}
> +		crtc->port = of_graph_get_port_by_id(dev->dev->of_node, 0);
>  		if (!crtc->port) { /* This should never happen */
>  			dev_err(dev->dev, "Port node not found in %s\n",
>  				dev->dev->of_node->full_name);
> diff --git a/drivers/gpu/drm/tilcdc/tilcdc_external.c b/drivers/gpu/drm/tilcdc/tilcdc_external.c
> index c67d7cd7d57e..19cf57a6ec76 100644
> --- a/drivers/gpu/drm/tilcdc/tilcdc_external.c
> +++ b/drivers/gpu/drm/tilcdc/tilcdc_external.c
> @@ -187,39 +187,6 @@ int tilcdc_attach_bridge(struct drm_device *ddev, struct drm_bridge *bridge)
>  	return ret;
>  }
>
> -static int tilcdc_node_has_port(struct device_node *dev_node)
> -{
> -	struct device_node *node;
> -
> -	node = of_get_child_by_name(dev_node, "ports");
> -	if (!node)
> -		node = of_get_child_by_name(dev_node, "port");
> -	if (!node)
> -		return 0;
> -	of_node_put(node);
> -
> -	return 1;
> -}
> -
> -static
> -struct device_node *tilcdc_get_remote_node(struct device_node *node)
> -{
> -	struct device_node *ep;
> -	struct device_node *parent;
> -
> -	if (!tilcdc_node_has_port(node))
> -		return NULL;
> -
> -	ep = of_graph_get_next_endpoint(node, NULL);
> -	if (!ep)
> -		return NULL;
> -
> -	parent = of_graph_get_remote_port_parent(ep);
> -	of_node_put(ep);
> -
> -	return parent;
> -}
> -
>  int tilcdc_attach_external_device(struct drm_device *ddev)
>  {
>  	struct tilcdc_drm_private *priv = ddev->dev_private;
> @@ -227,7 +194,7 @@ int tilcdc_attach_external_device(struct drm_device *ddev)
>  	struct drm_bridge *bridge;
>  	int ret;
>
> -	remote_node = tilcdc_get_remote_node(ddev->dev->of_node);
> +	remote_node = of_graph_get_remote_node(ddev->dev->of_node, 0, 0);
>  	if (!remote_node)
>  		return 0;
>
> @@ -266,35 +233,16 @@ int tilcdc_get_external_components(struct device *dev,
>  				   struct component_match **match)
>  {
>  	struct device_node *node;
> -	struct device_node *ep = NULL;
> -	int count = 0;
> -	int ret = 0;
> -
> -	if (!tilcdc_node_has_port(dev->of_node))
> -		return 0;
>
> -	while ((ep = of_graph_get_next_endpoint(dev->of_node, ep))) {
> -		node = of_graph_get_remote_port_parent(ep);
> -		if (!node || !of_device_is_available(node)) {
> -			of_node_put(node);
> -			continue;
> -		}
> -
> -		dev_dbg(dev, "Subdevice node '%s' found\n", node->name);
> -
> -		if (of_device_is_compatible(node, "nxp,tda998x")) {
> -			if (match)
> -				drm_of_component_match_add(dev, match,
> -							   dev_match_of, node);
> -			ret = 1;
> -		}
> +	node = of_graph_get_remote_node(dev->of_node, 0, 0);
>
> +	if (!of_device_is_compatible(node, "nxp,tda998x")) {
>  		of_node_put(node);
> -		if (count++ > 1) {
> -			dev_err(dev, "Only one port is supported\n");
> -			return -EINVAL;
> -		}
> +		return 0;
>  	}
>
> -	return ret;
> +	if (match)
> +		drm_of_component_match_add(dev, match, dev_match_of, node);
> +	of_node_put(node);
> +	return 1;
>  }
> diff --git a/drivers/gpu/drm/vc4/vc4_dpi.c b/drivers/gpu/drm/vc4/vc4_dpi.c
> index 1e1f6b8184d0..ac9655451b25 100644
> --- a/drivers/gpu/drm/vc4/vc4_dpi.c
> +++ b/drivers/gpu/drm/vc4/vc4_dpi.c
> @@ -366,23 +366,14 @@ static const struct of_device_id vc4_dpi_dt_match[] = {
>   */
>  static struct drm_panel *vc4_dpi_get_panel(struct device *dev)
>  {
> -	struct device_node *endpoint, *panel_node;
> +	struct device_node *panel_node;
>  	struct device_node *np = dev->of_node;
>  	struct drm_panel *panel;
>
> -	endpoint = of_graph_get_next_endpoint(np, NULL);
> -	if (!endpoint) {
> -		dev_err(dev, "no endpoint to fetch DPI panel\n");
> -		return NULL;
> -	}
> -
>  	/* don't proceed if we have an endpoint but no panel_node tied to it */
> -	panel_node = of_graph_get_remote_port_parent(endpoint);
> -	of_node_put(endpoint);
> -	if (!panel_node) {
> -		dev_err(dev, "no valid panel node\n");
> +	panel_node = of_graph_get_remote_node(np, 0, 0);
> +	if (!panel_node)
>  		return NULL;
> -	}
>
>  	panel = of_drm_find_panel(panel_node);
>  	of_node_put(panel_node);
> --
> 2.10.1
>

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Re: [PATCH v2 3/6] drm: of: introduce drm_of_find_panel_or_bridge

[Archit Taneja]

On 02/10/2017 12:35 AM, Rob Herring wrote:
> Many drivers have a common pattern of searching the OF graph for either an
> attached panel or bridge and then finding the DRM struct for the panel
> or bridge. Also, most drivers need to handle deferred probing when the
> DRM device is not yet instantiated. Create a common function,
> drm_of_find_panel_or_bridge, to find the connected node and the
> associated DRM panel or bridge device.
>
> Signed-off-by: Rob Herring <robh@kernel.org>
> Acked-by: Philipp Zabel <p.zabel@pengutronix.de>
> ---
> v2:
> - Reworked code flow
> - Added note that at least one of panel or bridge must not be NULL.
>
>  drivers/gpu/drm/drm_of.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++++
>  include/drm/drm_of.h     | 13 ++++++++++++
>  2 files changed, 65 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_of.c b/drivers/gpu/drm/drm_of.c
> index 47848ed8ca48..86b8b959587a 100644
> --- a/drivers/gpu/drm/drm_of.c
> +++ b/drivers/gpu/drm/drm_of.c
> @@ -3,7 +3,9 @@
>  #include <linux/list.h>
>  #include <linux/of_graph.h>
>  #include <drm/drmP.h>
> +#include <drm/drm_bridge.h>
>  #include <drm/drm_crtc.h>
> +#include <drm/drm_panel.h>
>  #include <drm/drm_of.h>
>
>  static void drm_release_of(struct device *dev, void *data)
> @@ -207,3 +209,53 @@ int drm_of_encoder_active_endpoint(struct device_node *node,
>  	return -EINVAL;
>  }
>  EXPORT_SYMBOL_GPL(drm_of_encoder_active_endpoint);
> +
> +/*
> + * drm_of_find_panel_or_bridge - return connected panel or bridge device
> + * @np: device tree node containing encoder input ports

Should this be 'encoder output ports'? It's the encoder's output port(s) that
contain the endpoint corresponding to the bridge/panel input port.

Thanks,
Archit

> + * @panel: pointer to hold returned drm_panel
> + * @bridge: pointer to hold returned drm_bridge
> + *
> + * Given a DT node's port and endpoint number, find the connected node and
> + * return either the associated struct drm_panel or drm_bridge device. Either
> + * @panel or @bridge must not be NULL.
> + *
> + * Returns zero if successful, or one of the standard error codes if it fails.
> + */
> +int drm_of_find_panel_or_bridge(const struct device_node *np,
> +				int port, int endpoint,
> +				struct drm_panel **panel,
> +				struct drm_bridge **bridge)
> +{
> +	int ret = -EPROBE_DEFER;
> +	struct device_node *remote;
> +
> +	if (!panel && !bridge)
> +		return -EINVAL;
> +
> +	remote = of_graph_get_remote_node(np, port, endpoint);
> +	if (!remote)
> +		return -ENODEV;
> +
> +	if (panel) {
> +		*panel = of_drm_find_panel(remote);
> +		if (*panel)
> +			ret = 0;
> +	}
> +
> +	/* No panel found yet, check for a bridge next. */
> +	if (bridge) {
> +		if (ret) {
> +			*bridge = of_drm_find_bridge(remote);
> +			if (*bridge)
> +				ret = 0;
> +		} else {
> +			*bridge = NULL;
> +		}
> +
> +	}
> +
> +	of_node_put(remote);
> +	return ret;
> +}
> +EXPORT_SYMBOL_GPL(drm_of_find_panel_or_bridge);
> diff --git a/include/drm/drm_of.h b/include/drm/drm_of.h
> index 26a64805cc15..f86507f0599b 100644
> --- a/include/drm/drm_of.h
> +++ b/include/drm/drm_of.h
> @@ -8,6 +8,8 @@ struct component_match;
>  struct device;
>  struct drm_device;
>  struct drm_encoder;
> +struct drm_panel;
> +struct drm_bridge;
>  struct device_node;
>
>  #ifdef CONFIG_OF
> @@ -23,6 +25,10 @@ extern int drm_of_component_probe(struct device *dev,
>  extern int drm_of_encoder_active_endpoint(struct device_node *node,
>  					  struct drm_encoder *encoder,
>  					  struct of_endpoint *endpoint);
> +extern int drm_of_find_panel_or_bridge(const struct device_node *np,
> +				       int port, int endpoint,
> +				       struct drm_panel **panel,
> +				       struct drm_bridge **bridge);
>  #else
>  static inline uint32_t drm_of_find_possible_crtcs(struct drm_device *dev,
>  						  struct device_node *port)
> @@ -52,6 +58,13 @@ static inline int drm_of_encoder_active_endpoint(struct device_node *node,
>  {
>  	return -EINVAL;
>  }
> +static inline int drm_of_find_panel_or_bridge(const struct device_node *np,
> +					      int port, int endpoint,
> +					      struct drm_panel **panel,
> +					      struct drm_bridge **bridge)
> +{
> +	return -EINVAL;
> +}
>  #endif
>
>  static inline int drm_of_encoder_active_endpoint_id(struct device_node *node,
> --
> 2.10.1
>

-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project

Re: [PATCH v2 3/6] drm: of: introduce drm_of_find_panel_or_bridge

[Archit Taneja]

On 02/10/2017 12:35 AM, Rob Herring wrote:
> Many drivers have a common pattern of searching the OF graph for either an
> attached panel or bridge and then finding the DRM struct for the panel
> or bridge. Also, most drivers need to handle deferred probing when the
> DRM device is not yet instantiated. Create a common function,
> drm_of_find_panel_or_bridge, to find the connected node and the
> associated DRM panel or bridge device.
>
> Signed-off-by: Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
> Acked-by: Philipp Zabel <p.zabel-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
> ---
> v2:
> - Reworked code flow
> - Added note that at least one of panel or bridge must not be NULL.
>
>  drivers/gpu/drm/drm_of.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++++
>  include/drm/drm_of.h     | 13 ++++++++++++
>  2 files changed, 65 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_of.c b/drivers/gpu/drm/drm_of.c
> index 47848ed8ca48..86b8b959587a 100644
> --- a/drivers/gpu/drm/drm_of.c
> +++ b/drivers/gpu/drm/drm_of.c
> @@ -3,7 +3,9 @@
>  #include <linux/list.h>
>  #include <linux/of_graph.h>
>  #include <drm/drmP.h>
> +#include <drm/drm_bridge.h>
>  #include <drm/drm_crtc.h>
> +#include <drm/drm_panel.h>
>  #include <drm/drm_of.h>
>
>  static void drm_release_of(struct device *dev, void *data)
> @@ -207,3 +209,53 @@ int drm_of_encoder_active_endpoint(struct device_node *node,
>  	return -EINVAL;
>  }
>  EXPORT_SYMBOL_GPL(drm_of_encoder_active_endpoint);
> +
> +/*
> + * drm_of_find_panel_or_bridge - return connected panel or bridge device
> + * @np: device tree node containing encoder input ports

Should this be 'encoder output ports'? It's the encoder's output port(s) that
contain the endpoint corresponding to the bridge/panel input port.

Thanks,
Archit

> + * @panel: pointer to hold returned drm_panel
> + * @bridge: pointer to hold returned drm_bridge
> + *
> + * Given a DT node's port and endpoint number, find the connected node and
> + * return either the associated struct drm_panel or drm_bridge device. Either
> + * @panel or @bridge must not be NULL.
> + *
> + * Returns zero if successful, or one of the standard error codes if it fails.
> + */
> +int drm_of_find_panel_or_bridge(const struct device_node *np,
> +				int port, int endpoint,
> +				struct drm_panel **panel,
> +				struct drm_bridge **bridge)
> +{
> +	int ret = -EPROBE_DEFER;
> +	struct device_node *remote;
> +
> +	if (!panel && !bridge)
> +		return -EINVAL;
> +
> +	remote = of_graph_get_remote_node(np, port, endpoint);
> +	if (!remote)
> +		return -ENODEV;
> +
> +	if (panel) {
> +		*panel = of_drm_find_panel(remote);
> +		if (*panel)
> +			ret = 0;
> +	}
> +
> +	/* No panel found yet, check for a bridge next. */
> +	if (bridge) {
> +		if (ret) {
> +			*bridge = of_drm_find_bridge(remote);
> +			if (*bridge)
> +				ret = 0;
> +		} else {
> +			*bridge = NULL;
> +		}
> +
> +	}
> +
> +	of_node_put(remote);
> +	return ret;
> +}
> +EXPORT_SYMBOL_GPL(drm_of_find_panel_or_bridge);
> diff --git a/include/drm/drm_of.h b/include/drm/drm_of.h
> index 26a64805cc15..f86507f0599b 100644
> --- a/include/drm/drm_of.h
> +++ b/include/drm/drm_of.h
> @@ -8,6 +8,8 @@ struct component_match;
>  struct device;
>  struct drm_device;
>  struct drm_encoder;
> +struct drm_panel;
> +struct drm_bridge;
>  struct device_node;
>
>  #ifdef CONFIG_OF
> @@ -23,6 +25,10 @@ extern int drm_of_component_probe(struct device *dev,
>  extern int drm_of_encoder_active_endpoint(struct device_node *node,
>  					  struct drm_encoder *encoder,
>  					  struct of_endpoint *endpoint);
> +extern int drm_of_find_panel_or_bridge(const struct device_node *np,
> +				       int port, int endpoint,
> +				       struct drm_panel **panel,
> +				       struct drm_bridge **bridge);
>  #else
>  static inline uint32_t drm_of_find_possible_crtcs(struct drm_device *dev,
>  						  struct device_node *port)
> @@ -52,6 +58,13 @@ static inline int drm_of_encoder_active_endpoint(struct device_node *node,
>  {
>  	return -EINVAL;
>  }
> +static inline int drm_of_find_panel_or_bridge(const struct device_node *np,
> +					      int port, int endpoint,
> +					      struct drm_panel **panel,
> +					      struct drm_bridge **bridge)
> +{
> +	return -EINVAL;
> +}
>  #endif
>
>  static inline int drm_of_encoder_active_endpoint_id(struct device_node *node,
> --
> 2.10.1
>

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Re: [PATCH v2 5/6] drm: convert drivers to use drm_of_find_panel_or_bridge

[Archit Taneja]

On 02/10/2017 12:35 AM, Rob Herring wrote:
> Similar to the previous commit, convert drivers open coding OF graph
> parsing to use drm_of_find_panel_or_bridge instead.
>
> This changes some error messages to debug messages (in the graph core).
> Graph connections are often "no connects" depending on the particular
> board, so we want to avoid spurious messages. Plus the kernel is not a
> DT validator.

For the bridge drivers:

Reviewed-by: Archit Taneja <architt@codeaurora.org>

Thanks,
Archit

>
> Signed-off-by: Rob Herring <robh@kernel.org>
> ---
> v2:
> - fix wrong node ptr in imx-ldb
> - build fixes in kirin and imx drivers
>
>  drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c | 64 ++++-------------
>  drivers/gpu/drm/bridge/nxp-ptn3460.c             | 16 ++---
>  drivers/gpu/drm/bridge/parade-ps8622.c           | 16 ++---
>  drivers/gpu/drm/bridge/tc358767.c                | 27 +------
>  drivers/gpu/drm/exynos/exynos_dp.c               | 35 ++++-----
>  drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c        | 49 ++++---------
>  drivers/gpu/drm/hisilicon/kirin/dw_drm_dsi.c     | 27 ++-----
>  drivers/gpu/drm/imx/imx-ldb.c                    | 27 ++-----
>  drivers/gpu/drm/imx/parallel-display.c           | 36 ++--------
>  drivers/gpu/drm/mediatek/mtk_dsi.c               | 23 ++----
>  drivers/gpu/drm/mxsfb/mxsfb_out.c                | 36 ++--------
>  drivers/gpu/drm/rockchip/analogix_dp-rockchip.c  | 26 ++-----
>  drivers/gpu/drm/sun4i/sun4i_rgb.c                | 13 ++--
>  drivers/gpu/drm/sun4i/sun4i_tcon.c               | 90 ++----------------------
>  14 files changed, 88 insertions(+), 397 deletions(-)
>
> diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c
> index 6119b5085501..4614048a4935 100644
> --- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c
> +++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c
> @@ -22,7 +22,7 @@
>  #include <linux/of_graph.h>
>
>  #include <drm/drmP.h>
> -#include <drm/drm_panel.h>
> +#include <drm/drm_of.h>
>
>  #include "atmel_hlcdc_dc.h"
>
> @@ -152,29 +152,11 @@ static const struct drm_connector_funcs atmel_hlcdc_panel_connector_funcs = {
>  	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
>  };
>
> -static int atmel_hlcdc_check_endpoint(struct drm_device *dev,
> -				      const struct of_endpoint *ep)
> -{
> -	struct device_node *np;
> -	void *obj;
> -
> -	np = of_graph_get_remote_port_parent(ep->local_node);
> -
> -	obj = of_drm_find_panel(np);
> -	if (!obj)
> -		obj = of_drm_find_bridge(np);
> -
> -	of_node_put(np);
> -
> -	return obj ? 0 : -EPROBE_DEFER;
> -}
> -
>  static int atmel_hlcdc_attach_endpoint(struct drm_device *dev,
> -				       const struct of_endpoint *ep)
> +				       const struct device_node *np)
>  {
>  	struct atmel_hlcdc_dc *dc = dev->dev_private;
>  	struct atmel_hlcdc_rgb_output *output;
> -	struct device_node *np;
>  	struct drm_panel *panel;
>  	struct drm_bridge *bridge;
>  	int ret;
> @@ -195,13 +177,11 @@ static int atmel_hlcdc_attach_endpoint(struct drm_device *dev,
>
>  	output->encoder.possible_crtcs = 0x1;
>
> -	np = of_graph_get_remote_port_parent(ep->local_node);
> -
> -	ret = -EPROBE_DEFER;
> +	ret = drm_of_find_panel_or_bridge(np, 0, 0, &panel, &bridge);
> +	if (ret)
> +		return ret;
>
> -	panel = of_drm_find_panel(np);
>  	if (panel) {
> -		of_node_put(np);
>  		output->connector.dpms = DRM_MODE_DPMS_OFF;
>  		output->connector.polled = DRM_CONNECTOR_POLL_CONNECT;
>  		drm_connector_helper_add(&output->connector,
> @@ -226,9 +206,6 @@ static int atmel_hlcdc_attach_endpoint(struct drm_device *dev,
>  		return 0;
>  	}
>
> -	bridge = of_drm_find_bridge(np);
> -	of_node_put(np);
> -
>  	if (bridge) {
>  		output->encoder.bridge = bridge;
>  		bridge->encoder = &output->encoder;
> @@ -245,31 +222,14 @@ static int atmel_hlcdc_attach_endpoint(struct drm_device *dev,
>
>  int atmel_hlcdc_create_outputs(struct drm_device *dev)
>  {
> -	struct device_node *ep_np = NULL;
> -	struct of_endpoint ep;
> +	struct device_node *remote;
>  	int ret;
>
> -	for_each_endpoint_of_node(dev->dev->of_node, ep_np) {
> -		ret = of_graph_parse_endpoint(ep_np, &ep);
> -		if (!ret)
> -			ret = atmel_hlcdc_check_endpoint(dev, &ep);
> -
> -		if (ret) {
> -			of_node_put(ep_np);
> -			return ret;
> -		}
> -	}
> -
> -	for_each_endpoint_of_node(dev->dev->of_node, ep_np) {
> -		ret = of_graph_parse_endpoint(ep_np, &ep);
> -		if (!ret)
> -			ret = atmel_hlcdc_attach_endpoint(dev, &ep);
> -
> -		if (ret) {
> -			of_node_put(ep_np);
> -			return ret;
> -		}
> -	}
> +	remote = of_graph_get_remote_node(dev->dev->of_node, 0, 0);
> +	if (!remote)
> +		return -ENODEV;
>
> -	return 0;
> +	ret = atmel_hlcdc_attach_endpoint(dev, remote);
> +	of_node_put(remote);
> +	return ret;
>  }
> diff --git a/drivers/gpu/drm/bridge/nxp-ptn3460.c b/drivers/gpu/drm/bridge/nxp-ptn3460.c
> index 27f98c518dde..351704390d02 100644
> --- a/drivers/gpu/drm/bridge/nxp-ptn3460.c
> +++ b/drivers/gpu/drm/bridge/nxp-ptn3460.c
> @@ -20,8 +20,8 @@
>  #include <linux/module.h>
>  #include <linux/of.h>
>  #include <linux/of_gpio.h>
> -#include <linux/of_graph.h>
>
> +#include <drm/drm_of.h>
>  #include <drm/drm_panel.h>
>
>  #include "drm_crtc.h"
> @@ -292,7 +292,6 @@ static int ptn3460_probe(struct i2c_client *client,
>  {
>  	struct device *dev = &client->dev;
>  	struct ptn3460_bridge *ptn_bridge;
> -	struct device_node *endpoint, *panel_node;
>  	int ret;
>
>  	ptn_bridge = devm_kzalloc(dev, sizeof(*ptn_bridge), GFP_KERNEL);
> @@ -300,16 +299,9 @@ static int ptn3460_probe(struct i2c_client *client,
>  		return -ENOMEM;
>  	}
>
> -	endpoint = of_graph_get_next_endpoint(dev->of_node, NULL);
> -	if (endpoint) {
> -		panel_node = of_graph_get_remote_port_parent(endpoint);
> -		if (panel_node) {
> -			ptn_bridge->panel = of_drm_find_panel(panel_node);
> -			of_node_put(panel_node);
> -			if (!ptn_bridge->panel)
> -				return -EPROBE_DEFER;
> -		}
> -	}
> +	ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &ptn_bridge->panel, NULL);
> +	if (ret)
> +		return ret;
>
>  	ptn_bridge->client = client;
>
> diff --git a/drivers/gpu/drm/bridge/parade-ps8622.c b/drivers/gpu/drm/bridge/parade-ps8622.c
> index ac8cc5b50d9f..1dcec3b97e67 100644
> --- a/drivers/gpu/drm/bridge/parade-ps8622.c
> +++ b/drivers/gpu/drm/bridge/parade-ps8622.c
> @@ -22,10 +22,10 @@
>  #include <linux/module.h>
>  #include <linux/of.h>
>  #include <linux/of_device.h>
> -#include <linux/of_graph.h>
>  #include <linux/pm.h>
>  #include <linux/regulator/consumer.h>
>
> +#include <drm/drm_of.h>
>  #include <drm/drm_panel.h>
>
>  #include "drmP.h"
> @@ -536,7 +536,6 @@ static int ps8622_probe(struct i2c_client *client,
>  					const struct i2c_device_id *id)
>  {
>  	struct device *dev = &client->dev;
> -	struct device_node *endpoint, *panel_node;
>  	struct ps8622_bridge *ps8622;
>  	int ret;
>
> @@ -544,16 +543,9 @@ static int ps8622_probe(struct i2c_client *client,
>  	if (!ps8622)
>  		return -ENOMEM;
>
> -	endpoint = of_graph_get_next_endpoint(dev->of_node, NULL);
> -	if (endpoint) {
> -		panel_node = of_graph_get_remote_port_parent(endpoint);
> -		if (panel_node) {
> -			ps8622->panel = of_drm_find_panel(panel_node);
> -			of_node_put(panel_node);
> -			if (!ps8622->panel)
> -				return -EPROBE_DEFER;
> -		}
> -	}
> +	ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &ps8622->panel, NULL);
> +	if (ret)
> +		return ret;
>
>  	ps8622->client = client;
>
> diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c
> index de9ffb49e9f6..5c26488e7a2d 100644
> --- a/drivers/gpu/drm/bridge/tc358767.c
> +++ b/drivers/gpu/drm/bridge/tc358767.c
> @@ -1244,7 +1244,6 @@ static const struct regmap_config tc_regmap_config = {
>  static int tc_probe(struct i2c_client *client, const struct i2c_device_id *id)
>  {
>  	struct device *dev = &client->dev;
> -	struct device_node *ep;
>  	struct tc_data *tc;
>  	int ret;
>
> @@ -1255,29 +1254,9 @@ static int tc_probe(struct i2c_client *client, const struct i2c_device_id *id)
>  	tc->dev = dev;
>
>  	/* port@2 is the output port */
> -	ep = of_graph_get_endpoint_by_regs(dev->of_node, 2, -1);
> -	if (ep) {
> -		struct device_node *remote;
> -
> -		remote = of_graph_get_remote_port_parent(ep);
> -		if (!remote) {
> -			dev_warn(dev, "endpoint %s not connected\n",
> -				 ep->full_name);
> -			of_node_put(ep);
> -			return -ENODEV;
> -		}
> -		of_node_put(ep);
> -		tc->panel = of_drm_find_panel(remote);
> -		if (tc->panel) {
> -			dev_dbg(dev, "found panel %s\n", remote->full_name);
> -		} else {
> -			dev_dbg(dev, "waiting for panel %s\n",
> -				remote->full_name);
> -			of_node_put(remote);
> -			return -EPROBE_DEFER;
> -		}
> -		of_node_put(remote);
> -	}
> +	ret = drm_of_find_panel_or_bridge(dev->of_node, 2, 0, &tc->panel, NULL);
> +	if (ret)
> +		return ret;
>
>  	/* Shut down GPIO is optional */
>  	tc->sd_gpio = devm_gpiod_get_optional(dev, "shutdown", GPIOD_OUT_HIGH);
> diff --git a/drivers/gpu/drm/exynos/exynos_dp.c b/drivers/gpu/drm/exynos/exynos_dp.c
> index 528229faffe4..376c941c5189 100644
> --- a/drivers/gpu/drm/exynos/exynos_dp.c
> +++ b/drivers/gpu/drm/exynos/exynos_dp.c
> @@ -23,6 +23,7 @@
>  #include <drm/drmP.h>
>  #include <drm/drm_crtc.h>
>  #include <drm/drm_crtc_helper.h>
> +#include <drm/drm_of.h>
>  #include <drm/drm_panel.h>
>
>  #include <drm/bridge/analogix_dp.h>
> @@ -215,8 +216,11 @@ static const struct component_ops exynos_dp_ops = {
>  static int exynos_dp_probe(struct platform_device *pdev)
>  {
>  	struct device *dev = &pdev->dev;
> -	struct device_node *np = NULL, *endpoint = NULL;
> +	struct device_node *np;
>  	struct exynos_dp_device *dp;
> +	struct drm_panel *panel;
> +	struct drm_bridge *bridge;
> +	int ret;
>
>  	dp = devm_kzalloc(&pdev->dev, sizeof(struct exynos_dp_device),
>  			  GFP_KERNEL);
> @@ -240,28 +244,13 @@ static int exynos_dp_probe(struct platform_device *pdev)
>  		goto out;
>  	}
>
> -	endpoint = of_graph_get_next_endpoint(dev->of_node, NULL);
> -	if (endpoint) {
> -		np = of_graph_get_remote_port_parent(endpoint);
> -		if (np) {
> -			/* The remote port can be either a panel or a bridge */
> -			dp->plat_data.panel = of_drm_find_panel(np);
> -			if (!dp->plat_data.panel) {
> -				dp->ptn_bridge = of_drm_find_bridge(np);
> -				if (!dp->ptn_bridge) {
> -					of_node_put(np);
> -					return -EPROBE_DEFER;
> -				}
> -			}
> -			of_node_put(np);
> -		} else {
> -			DRM_ERROR("no remote endpoint device node found.\n");
> -			return -EINVAL;
> -		}
> -	} else {
> -		DRM_ERROR("no port endpoint subnode found.\n");
> -		return -EINVAL;
> -	}
> +	ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &panel, &bridge);
> +	if (ret)
> +		return ret;
> +
> +	/* The remote port can be either a panel or a bridge */
> +	dp->plat_data.panel = panel;
> +	dp->ptn_bridge = bridge;
>
>  out:
>  	return component_add(&pdev->dev, &exynos_dp_ops);
> diff --git a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c
> index 05a8ee106879..3cae7dd75834 100644
> --- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c
> +++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c
> @@ -15,6 +15,7 @@
>  #include <drm/drmP.h>
>  #include <drm/drm_atomic_helper.h>
>  #include <drm/drm_crtc_helper.h>
> +#include <drm/drm_of.h>
>  #include <drm/drm_panel.h>
>
>  #include "fsl_dcu_drm_drv.h"
> @@ -141,35 +142,11 @@ static int fsl_dcu_attach_panel(struct fsl_dcu_drm_device *fsl_dev,
>  	return ret;
>  }
>
> -static int fsl_dcu_attach_endpoint(struct fsl_dcu_drm_device *fsl_dev,
> -				   const struct of_endpoint *ep)
> -{
> -	struct drm_bridge *bridge;
> -	struct device_node *np;
> -
> -	np = of_graph_get_remote_port_parent(ep->local_node);
> -
> -	fsl_dev->connector.panel = of_drm_find_panel(np);
> -	if (fsl_dev->connector.panel) {
> -		of_node_put(np);
> -		return fsl_dcu_attach_panel(fsl_dev, fsl_dev->connector.panel);
> -	}
> -
> -	bridge = of_drm_find_bridge(np);
> -	of_node_put(np);
> -	if (!bridge)
> -		return -ENODEV;
> -
> -	fsl_dev->encoder.bridge = bridge;
> -	bridge->encoder = &fsl_dev->encoder;
> -
> -	return drm_bridge_attach(fsl_dev->drm, bridge);
> -}
> -
>  int fsl_dcu_create_outputs(struct fsl_dcu_drm_device *fsl_dev)
>  {
> -	struct of_endpoint ep;
> -	struct device_node *ep_node, *panel_node;
> +	struct device_node *panel_node;
> +	struct drm_bridge *bridge;
> +	struct drm_panel *panel;
>  	int ret;
>
>  	/* This is for backward compatibility */
> @@ -182,14 +159,16 @@ int fsl_dcu_create_outputs(struct fsl_dcu_drm_device *fsl_dev)
>  		return fsl_dcu_attach_panel(fsl_dev, fsl_dev->connector.panel);
>  	}
>
> -	ep_node = of_graph_get_next_endpoint(fsl_dev->np, NULL);
> -	if (!ep_node)
> -		return -ENODEV;
> -
> -	ret = of_graph_parse_endpoint(ep_node, &ep);
> -	of_node_put(ep_node);
> +	ret = drm_of_find_panel_or_bridge(fsl_dev->np, 0, 0, &panel, &bridge);
>  	if (ret)
> -		return -ENODEV;
> +		return ret;
>
> -	return fsl_dcu_attach_endpoint(fsl_dev, &ep);
> +	if (panel) {
> +		fsl_dev->connector.panel = panel;
> +		return fsl_dcu_attach_panel(fsl_dev, panel);
> +	}
> +
> +	fsl_dev->encoder.bridge = bridge;
> +	bridge->encoder = &fsl_dev->encoder;
> +	return drm_bridge_attach(fsl_dev->drm, bridge);
>  }
> diff --git a/drivers/gpu/drm/hisilicon/kirin/dw_drm_dsi.c b/drivers/gpu/drm/hisilicon/kirin/dw_drm_dsi.c
> index 998452ad0fcb..0f23e2c55862 100644
> --- a/drivers/gpu/drm/hisilicon/kirin/dw_drm_dsi.c
> +++ b/drivers/gpu/drm/hisilicon/kirin/dw_drm_dsi.c
> @@ -17,7 +17,6 @@
>
>  #include <linux/clk.h>
>  #include <linux/component.h>
> -#include <linux/of_graph.h>
>
>  #include <drm/drm_of.h>
>  #include <drm/drm_crtc_helper.h>
> @@ -757,34 +756,16 @@ static int dsi_parse_dt(struct platform_device *pdev, struct dw_dsi *dsi)
>  {
>  	struct dsi_hw_ctx *ctx = dsi->ctx;
>  	struct device_node *np = pdev->dev.of_node;
> -	struct device_node *endpoint, *bridge_node;
> -	struct drm_bridge *bridge;
>  	struct resource *res;
> +	int ret;
>
>  	/*
>  	 * Get the endpoint node. In our case, dsi has one output port1
>  	 * to which the external HDMI bridge is connected.
>  	 */
> -	endpoint = of_graph_get_endpoint_by_regs(np, 1, -1);
> -	if (!endpoint) {
> -		DRM_ERROR("no valid endpoint node\n");
> -		return -ENODEV;
> -	}
> -	of_node_put(endpoint);
> -
> -	bridge_node = of_graph_get_remote_port_parent(endpoint);
> -	if (!bridge_node) {
> -		DRM_ERROR("no valid bridge node\n");
> -		return -ENODEV;
> -	}
> -	of_node_put(bridge_node);
> -
> -	bridge = of_drm_find_bridge(bridge_node);
> -	if (!bridge) {
> -		DRM_INFO("wait for external HDMI bridge driver.\n");
> -		return -EPROBE_DEFER;
> -	}
> -	dsi->bridge = bridge;
> +	ret = drm_of_find_panel_or_bridge(np, 0, 0, NULL, &dsi->bridge);
> +	if (ret)
> +		return ret;
>
>  	ctx->pclk = devm_clk_get(&pdev->dev, "pclk");
>  	if (IS_ERR(ctx->pclk)) {
> diff --git a/drivers/gpu/drm/imx/imx-ldb.c b/drivers/gpu/drm/imx/imx-ldb.c
> index 516d06490465..506d5c1d1263 100644
> --- a/drivers/gpu/drm/imx/imx-ldb.c
> +++ b/drivers/gpu/drm/imx/imx-ldb.c
> @@ -649,7 +649,6 @@ static int imx_ldb_bind(struct device *dev, struct device *master, void *data)
>
>  	for_each_child_of_node(np, child) {
>  		struct imx_ldb_channel *channel;
> -		struct device_node *ep;
>  		int bus_format;
>
>  		ret = of_property_read_u32(child, "reg", &i);
> @@ -673,27 +672,11 @@ static int imx_ldb_bind(struct device *dev, struct device *master, void *data)
>  		 * The output port is port@4 with an external 4-port mux or
>  		 * port@2 with the internal 2-port mux.
>  		 */
> -		ep = of_graph_get_endpoint_by_regs(child,
> -						   imx_ldb->lvds_mux ? 4 : 2,
> -						   -1);
> -		if (ep) {
> -			struct device_node *remote;
> -
> -			remote = of_graph_get_remote_port_parent(ep);
> -			of_node_put(ep);
> -			if (remote) {
> -				channel->panel = of_drm_find_panel(remote);
> -				channel->bridge = of_drm_find_bridge(remote);
> -			} else
> -				return -EPROBE_DEFER;
> -			of_node_put(remote);
> -
> -			if (!channel->panel && !channel->bridge) {
> -				dev_err(dev, "panel/bridge not found: %s\n",
> -					remote->full_name);
> -				return -EPROBE_DEFER;
> -			}
> -		}
> +		ret = drm_of_find_panel_or_bridge(child,
> +						  imx_ldb->lvds_mux ? 4 : 2, 0,
> +						  &channel->panel, &channel->bridge);
> +		if (ret)
> +			return ret;
>
>  		/* panel ddc only if there is no bridge */
>  		if (!channel->bridge) {
> diff --git a/drivers/gpu/drm/imx/parallel-display.c b/drivers/gpu/drm/imx/parallel-display.c
> index 8582a83c0d9b..92336f38c55e 100644
> --- a/drivers/gpu/drm/imx/parallel-display.c
> +++ b/drivers/gpu/drm/imx/parallel-display.c
> @@ -19,10 +19,10 @@
>  #include <drm/drm_atomic_helper.h>
>  #include <drm/drm_fb_helper.h>
>  #include <drm/drm_crtc_helper.h>
> +#include <drm/drm_of.h>
>  #include <drm/drm_panel.h>
>  #include <linux/videodev2.h>
>  #include <video/of_display_timing.h>
> -#include <linux/of_graph.h>
>
>  #include "imx-drm.h"
>
> @@ -210,7 +210,6 @@ static int imx_pd_bind(struct device *dev, struct device *master, void *data)
>  {
>  	struct drm_device *drm = data;
>  	struct device_node *np = dev->of_node;
> -	struct device_node *ep;
>  	const u8 *edidp;
>  	struct imx_parallel_display *imxpd;
>  	int ret;
> @@ -239,36 +238,9 @@ static int imx_pd_bind(struct device *dev, struct device *master, void *data)
>  	imxpd->bus_format = bus_format;
>
>  	/* port@1 is the output port */
> -	ep = of_graph_get_endpoint_by_regs(np, 1, -1);
> -	if (ep) {
> -		struct device_node *remote;
> -
> -		remote = of_graph_get_remote_port_parent(ep);
> -		if (!remote) {
> -			dev_warn(dev, "endpoint %s not connected\n",
> -				 ep->full_name);
> -			of_node_put(ep);
> -			return -ENODEV;
> -		}
> -		of_node_put(ep);
> -
> -		imxpd->panel = of_drm_find_panel(remote);
> -		if (imxpd->panel) {
> -			dev_dbg(dev, "found panel %s\n", remote->full_name);
> -		} else {
> -			imxpd->bridge = of_drm_find_bridge(remote);
> -			if (imxpd->bridge)
> -				dev_dbg(dev, "found bridge %s\n",
> -					remote->full_name);
> -		}
> -		if (!imxpd->panel && !imxpd->bridge) {
> -			dev_dbg(dev, "waiting for panel or bridge %s\n",
> -				remote->full_name);
> -			of_node_put(remote);
> -			return -EPROBE_DEFER;
> -		}
> -		of_node_put(remote);
> -	}
> +	ret = drm_of_find_panel_or_bridge(np, 1, 0, &imxpd->panel, &imxpd->bridge);
> +	if (ret)
> +		return ret;
>
>  	imxpd->dev = dev;
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
> index 2c42f90809d8..14140579f8d4 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dsi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
> @@ -16,11 +16,11 @@
>  #include <drm/drm_crtc_helper.h>
>  #include <drm/drm_mipi_dsi.h>
>  #include <drm/drm_panel.h>
> +#include <drm/drm_of.h>
>  #include <linux/clk.h>
>  #include <linux/component.h>
>  #include <linux/of.h>
>  #include <linux/of_platform.h>
> -#include <linux/of_graph.h>
>  #include <linux/phy/phy.h>
>  #include <linux/platform_device.h>
>  #include <video/videomode.h>
> @@ -819,7 +819,6 @@ static int mtk_dsi_probe(struct platform_device *pdev)
>  {
>  	struct mtk_dsi *dsi;
>  	struct device *dev = &pdev->dev;
> -	struct device_node *remote_node, *endpoint;
>  	struct resource *regs;
>  	int comp_id;
>  	int ret;
> @@ -831,22 +830,10 @@ static int mtk_dsi_probe(struct platform_device *pdev)
>  	dsi->host.ops = &mtk_dsi_ops;
>  	dsi->host.dev = dev;
>
> -	endpoint = of_graph_get_next_endpoint(dev->of_node, NULL);
> -	if (endpoint) {
> -		remote_node = of_graph_get_remote_port_parent(endpoint);
> -		if (!remote_node) {
> -			dev_err(dev, "No panel connected\n");
> -			return -ENODEV;
> -		}
> -
> -		dsi->bridge = of_drm_find_bridge(remote_node);
> -		dsi->panel = of_drm_find_panel(remote_node);
> -		of_node_put(remote_node);
> -		if (!dsi->bridge && !dsi->panel) {
> -			dev_info(dev, "Waiting for bridge or panel driver\n");
> -			return -EPROBE_DEFER;
> -		}
> -	}
> +	ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0,
> +					  &dsi->panel, &dsi->bridge);
> +	if (ret)
> +		return ret;
>
>  	dsi->engine_clk = devm_clk_get(dev, "engine");
>  	if (IS_ERR(dsi->engine_clk)) {
> diff --git a/drivers/gpu/drm/mxsfb/mxsfb_out.c b/drivers/gpu/drm/mxsfb/mxsfb_out.c
> index fa8d17399407..f7d729aa09bd 100644
> --- a/drivers/gpu/drm/mxsfb/mxsfb_out.c
> +++ b/drivers/gpu/drm/mxsfb/mxsfb_out.c
> @@ -19,6 +19,7 @@
>  #include <drm/drm_crtc_helper.h>
>  #include <drm/drm_fb_cma_helper.h>
>  #include <drm/drm_gem_cma_helper.h>
> +#include <drm/drm_of.h>
>  #include <drm/drm_panel.h>
>  #include <drm/drm_plane_helper.h>
>  #include <drm/drm_simple_kms_helper.h>
> @@ -82,20 +83,15 @@ static const struct drm_connector_funcs mxsfb_panel_connector_funcs = {
>  	.atomic_destroy_state	= drm_atomic_helper_connector_destroy_state,
>  };
>
> -static int mxsfb_attach_endpoint(struct drm_device *drm,
> -				 const struct of_endpoint *ep)
> +int mxsfb_create_output(struct drm_device *drm)
>  {
>  	struct mxsfb_drm_private *mxsfb = drm->dev_private;
> -	struct device_node *np;
>  	struct drm_panel *panel;
> -	int ret = -EPROBE_DEFER;
> -
> -	np = of_graph_get_remote_port_parent(ep->local_node);
> -	panel = of_drm_find_panel(np);
> -	of_node_put(np);
> +	int ret;
>
> -	if (!panel)
> -		return -EPROBE_DEFER;
> +	ret = drm_of_find_panel_or_bridge(drm->dev->of_node, 0, 0, &panel, NULL);
> +	if (ret)
> +		return ret;
>
>  	mxsfb->connector.dpms = DRM_MODE_DPMS_OFF;
>  	mxsfb->connector.polled = 0;
> @@ -109,23 +105,3 @@ static int mxsfb_attach_endpoint(struct drm_device *drm,
>
>  	return ret;
>  }
> -
> -int mxsfb_create_output(struct drm_device *drm)
> -{
> -	struct device_node *ep_np = NULL;
> -	struct of_endpoint ep;
> -	int ret;
> -
> -	for_each_endpoint_of_node(drm->dev->of_node, ep_np) {
> -		ret = of_graph_parse_endpoint(ep_np, &ep);
> -		if (!ret)
> -			ret = mxsfb_attach_endpoint(drm, &ep);
> -
> -		if (ret) {
> -			of_node_put(ep_np);
> -			return ret;
> -		}
> -	}
> -
> -	return 0;
> -}
> diff --git a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
> index 8548e8271639..615afad280a8 100644
> --- a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
> +++ b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
> @@ -428,31 +428,13 @@ static const struct component_ops rockchip_dp_component_ops = {
>  static int rockchip_dp_probe(struct platform_device *pdev)
>  {
>  	struct device *dev = &pdev->dev;
> -	struct device_node *panel_node, *port, *endpoint;
>  	struct drm_panel *panel = NULL;
>  	struct rockchip_dp_device *dp;
> +	int ret;
>
> -	port = of_graph_get_port_by_id(dev->of_node, 1);
> -	if (port) {
> -		endpoint = of_get_child_by_name(port, "endpoint");
> -		of_node_put(port);
> -		if (!endpoint) {
> -			dev_err(dev, "no output endpoint found\n");
> -			return -EINVAL;
> -		}
> -
> -		panel_node = of_graph_get_remote_port_parent(endpoint);
> -		of_node_put(endpoint);
> -		if (!panel_node) {
> -			dev_err(dev, "no output node found\n");
> -			return -EINVAL;
> -		}
> -
> -		panel = of_drm_find_panel(panel_node);
> -		of_node_put(panel_node);
> -		if (!panel)
> -			return -EPROBE_DEFER;
> -	}
> +	ret = drm_of_find_panel_or_bridge(dev->of_node, 1, 0, &panel, NULL);
> +	if (ret)
> +		return ret;
>
>  	dp = devm_kzalloc(dev, sizeof(*dp), GFP_KERNEL);
>  	if (!dp)
> diff --git a/drivers/gpu/drm/sun4i/sun4i_rgb.c b/drivers/gpu/drm/sun4i/sun4i_rgb.c
> index f5e86fe7750e..49daea05d325 100644
> --- a/drivers/gpu/drm/sun4i/sun4i_rgb.c
> +++ b/drivers/gpu/drm/sun4i/sun4i_rgb.c
> @@ -15,6 +15,7 @@
>  #include <drm/drmP.h>
>  #include <drm/drm_atomic_helper.h>
>  #include <drm/drm_crtc_helper.h>
> +#include <drm/drm_of.h>
>  #include <drm/drm_panel.h>
>
>  #include "sun4i_drv.h"
> @@ -217,9 +218,9 @@ int sun4i_rgb_init(struct drm_device *drm)
>  	rgb->drv = drv;
>  	encoder = &rgb->encoder;
>
> -	tcon->panel = sun4i_tcon_find_panel(tcon->dev->of_node);
> -	encoder->bridge = sun4i_tcon_find_bridge(tcon->dev->of_node);
> -	if (IS_ERR(tcon->panel) && IS_ERR(encoder->bridge)) {
> +	ret = drm_of_find_panel_or_bridge(tcon->dev->of_node, 1, 0,
> +					  &tcon->panel, &encoder->bridge);
> +	if (ret) {
>  		dev_info(drm->dev, "No panel or bridge found... RGB output disabled\n");
>  		return 0;
>  	}
> @@ -239,7 +240,7 @@ int sun4i_rgb_init(struct drm_device *drm)
>  	/* The RGB encoder can only work with the TCON channel 0 */
>  	rgb->encoder.possible_crtcs = BIT(0);
>
> -	if (!IS_ERR(tcon->panel)) {
> +	if (tcon->panel) {
>  		drm_connector_helper_add(&rgb->connector,
>  					 &sun4i_rgb_con_helper_funcs);
>  		ret = drm_connector_init(drm, &rgb->connector,
> @@ -260,7 +261,7 @@ int sun4i_rgb_init(struct drm_device *drm)
>  		}
>  	}
>
> -	if (!IS_ERR(encoder->bridge)) {
> +	if (encoder->bridge) {
>  		encoder->bridge->encoder = &rgb->encoder;
>
>  		ret = drm_bridge_attach(drm, encoder->bridge);
> @@ -268,8 +269,6 @@ int sun4i_rgb_init(struct drm_device *drm)
>  			dev_err(drm->dev, "Couldn't attach our bridge\n");
>  			goto err_cleanup_connector;
>  		}
> -	} else {
> -		encoder->bridge = NULL;
>  	}
>
>  	return 0;
> diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.c b/drivers/gpu/drm/sun4i/sun4i_tcon.c
> index ea2906f87cb9..2e4e365cecf9 100644
> --- a/drivers/gpu/drm/sun4i/sun4i_tcon.c
> +++ b/drivers/gpu/drm/sun4i/sun4i_tcon.c
> @@ -15,13 +15,12 @@
>  #include <drm/drm_crtc.h>
>  #include <drm/drm_crtc_helper.h>
>  #include <drm/drm_modes.h>
> -#include <drm/drm_panel.h>
> +#include <drm/drm_of.h>
>
>  #include <linux/component.h>
>  #include <linux/ioport.h>
>  #include <linux/of_address.h>
>  #include <linux/of_device.h>
> -#include <linux/of_graph.h>
>  #include <linux/of_irq.h>
>  #include <linux/regmap.h>
>  #include <linux/reset.h>
> @@ -405,74 +404,6 @@ static int sun4i_tcon_init_regmap(struct device *dev,
>  	return 0;
>  }
>
> -struct drm_panel *sun4i_tcon_find_panel(struct device_node *node)
> -{
> -	struct device_node *port, *remote, *child;
> -	struct device_node *end_node = NULL;
> -
> -	/* Inputs are listed first, then outputs */
> -	port = of_graph_get_port_by_id(node, 1);
> -
> -	/*
> -	 * Our first output is the RGB interface where the panel will
> -	 * be connected.
> -	 */
> -	for_each_child_of_node(port, child) {
> -		u32 reg;
> -
> -		of_property_read_u32(child, "reg", &reg);
> -		if (reg == 0)
> -			end_node = child;
> -	}
> -
> -	if (!end_node) {
> -		DRM_DEBUG_DRIVER("Missing panel endpoint\n");
> -		return ERR_PTR(-ENODEV);
> -	}
> -
> -	remote = of_graph_get_remote_port_parent(end_node);
> -	if (!remote) {
> -		DRM_DEBUG_DRIVER("Unable to parse remote node\n");
> -		return ERR_PTR(-EINVAL);
> -	}
> -
> -	return of_drm_find_panel(remote) ?: ERR_PTR(-EPROBE_DEFER);
> -}
> -
> -struct drm_bridge *sun4i_tcon_find_bridge(struct device_node *node)
> -{
> -	struct device_node *port, *remote, *child;
> -	struct device_node *end_node = NULL;
> -
> -	/* Inputs are listed first, then outputs */
> -	port = of_graph_get_port_by_id(node, 1);
> -
> -	/*
> -	 * Our first output is the RGB interface where the panel will
> -	 * be connected.
> -	 */
> -	for_each_child_of_node(port, child) {
> -		u32 reg;
> -
> -		of_property_read_u32(child, "reg", &reg);
> -		if (reg == 0)
> -			end_node = child;
> -	}
> -
> -	if (!end_node) {
> -		DRM_DEBUG_DRIVER("Missing bridge endpoint\n");
> -		return ERR_PTR(-ENODEV);
> -	}
> -
> -	remote = of_graph_get_remote_port_parent(end_node);
> -	if (!remote) {
> -		DRM_DEBUG_DRIVER("Enable to parse remote node\n");
> -		return ERR_PTR(-EINVAL);
> -	}
> -
> -	return of_drm_find_bridge(remote) ?: ERR_PTR(-EPROBE_DEFER);
> -}
> -
>  static int sun4i_tcon_bind(struct device *dev, struct device *master,
>  			   void *data)
>  {
> @@ -555,22 +486,11 @@ static int sun4i_tcon_probe(struct platform_device *pdev)
>  	struct device_node *node = pdev->dev.of_node;
>  	struct drm_bridge *bridge;
>  	struct drm_panel *panel;
> +	int ret;
>
> -	/*
> -	 * Neither the bridge or the panel is ready.
> -	 * Defer the probe.
> -	 */
> -	panel = sun4i_tcon_find_panel(node);
> -	bridge = sun4i_tcon_find_bridge(node);
> -
> -	/*
> -	 * If we don't have a panel endpoint, just go on
> -	 */
> -	if ((PTR_ERR(panel) == -EPROBE_DEFER) &&
> -	    (PTR_ERR(bridge) == -EPROBE_DEFER)) {
> -		DRM_DEBUG_DRIVER("Still waiting for our panel/bridge. Deferring...\n");
> -		return -EPROBE_DEFER;
> -	}
> +	ret = drm_of_find_panel_or_bridge(node, 1, 0, &panel, &bridge);
> +	if (ret == -EPROBE_DEFER)
> +		return ret;
>
>  	return component_add(&pdev->dev, &sun4i_tcon_ops);
>  }
> --
> 2.10.1
>

-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project

Re: [PATCH v2 5/6] drm: convert drivers to use drm_of_find_panel_or_bridge

[Archit Taneja]

On 02/10/2017 12:35 AM, Rob Herring wrote:
> Similar to the previous commit, convert drivers open coding OF graph
> parsing to use drm_of_find_panel_or_bridge instead.
>
> This changes some error messages to debug messages (in the graph core).
> Graph connections are often "no connects" depending on the particular
> board, so we want to avoid spurious messages. Plus the kernel is not a
> DT validator.

For the bridge drivers:

Reviewed-by: Archit Taneja <architt@codeaurora.org>

Thanks,
Archit

>
> Signed-off-by: Rob Herring <robh@kernel.org>
> ---
> v2:
> - fix wrong node ptr in imx-ldb
> - build fixes in kirin and imx drivers
>
>  drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c | 64 ++++-------------
>  drivers/gpu/drm/bridge/nxp-ptn3460.c             | 16 ++---
>  drivers/gpu/drm/bridge/parade-ps8622.c           | 16 ++---
>  drivers/gpu/drm/bridge/tc358767.c                | 27 +------
>  drivers/gpu/drm/exynos/exynos_dp.c               | 35 ++++-----
>  drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c        | 49 ++++---------
>  drivers/gpu/drm/hisilicon/kirin/dw_drm_dsi.c     | 27 ++-----
>  drivers/gpu/drm/imx/imx-ldb.c                    | 27 ++-----
>  drivers/gpu/drm/imx/parallel-display.c           | 36 ++--------
>  drivers/gpu/drm/mediatek/mtk_dsi.c               | 23 ++----
>  drivers/gpu/drm/mxsfb/mxsfb_out.c                | 36 ++--------
>  drivers/gpu/drm/rockchip/analogix_dp-rockchip.c  | 26 ++-----
>  drivers/gpu/drm/sun4i/sun4i_rgb.c                | 13 ++--
>  drivers/gpu/drm/sun4i/sun4i_tcon.c               | 90 ++----------------------
>  14 files changed, 88 insertions(+), 397 deletions(-)
>
> diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c
> index 6119b5085501..4614048a4935 100644
> --- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c
> +++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c
> @@ -22,7 +22,7 @@
>  #include <linux/of_graph.h>
>
>  #include <drm/drmP.h>
> -#include <drm/drm_panel.h>
> +#include <drm/drm_of.h>
>
>  #include "atmel_hlcdc_dc.h"
>
> @@ -152,29 +152,11 @@ static const struct drm_connector_funcs atmel_hlcdc_panel_connector_funcs = {
>  	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
>  };
>
> -static int atmel_hlcdc_check_endpoint(struct drm_device *dev,
> -				      const struct of_endpoint *ep)
> -{
> -	struct device_node *np;
> -	void *obj;
> -
> -	np = of_graph_get_remote_port_parent(ep->local_node);
> -
> -	obj = of_drm_find_panel(np);
> -	if (!obj)
> -		obj = of_drm_find_bridge(np);
> -
> -	of_node_put(np);
> -
> -	return obj ? 0 : -EPROBE_DEFER;
> -}
> -
>  static int atmel_hlcdc_attach_endpoint(struct drm_device *dev,
> -				       const struct of_endpoint *ep)
> +				       const struct device_node *np)
>  {
>  	struct atmel_hlcdc_dc *dc = dev->dev_private;
>  	struct atmel_hlcdc_rgb_output *output;
> -	struct device_node *np;
>  	struct drm_panel *panel;
>  	struct drm_bridge *bridge;
>  	int ret;
> @@ -195,13 +177,11 @@ static int atmel_hlcdc_attach_endpoint(struct drm_device *dev,
>
>  	output->encoder.possible_crtcs = 0x1;
>
> -	np = of_graph_get_remote_port_parent(ep->local_node);
> -
> -	ret = -EPROBE_DEFER;
> +	ret = drm_of_find_panel_or_bridge(np, 0, 0, &panel, &bridge);
> +	if (ret)
> +		return ret;
>
> -	panel = of_drm_find_panel(np);
>  	if (panel) {
> -		of_node_put(np);
>  		output->connector.dpms = DRM_MODE_DPMS_OFF;
>  		output->connector.polled = DRM_CONNECTOR_POLL_CONNECT;
>  		drm_connector_helper_add(&output->connector,
> @@ -226,9 +206,6 @@ static int atmel_hlcdc_attach_endpoint(struct drm_device *dev,
>  		return 0;
>  	}
>
> -	bridge = of_drm_find_bridge(np);
> -	of_node_put(np);
> -
>  	if (bridge) {
>  		output->encoder.bridge = bridge;
>  		bridge->encoder = &output->encoder;
> @@ -245,31 +222,14 @@ static int atmel_hlcdc_attach_endpoint(struct drm_device *dev,
>
>  int atmel_hlcdc_create_outputs(struct drm_device *dev)
>  {
> -	struct device_node *ep_np = NULL;
> -	struct of_endpoint ep;
> +	struct device_node *remote;
>  	int ret;
>
> -	for_each_endpoint_of_node(dev->dev->of_node, ep_np) {
> -		ret = of_graph_parse_endpoint(ep_np, &ep);
> -		if (!ret)
> -			ret = atmel_hlcdc_check_endpoint(dev, &ep);
> -
> -		if (ret) {
> -			of_node_put(ep_np);
> -			return ret;
> -		}
> -	}
> -
> -	for_each_endpoint_of_node(dev->dev->of_node, ep_np) {
> -		ret = of_graph_parse_endpoint(ep_np, &ep);
> -		if (!ret)
> -			ret = atmel_hlcdc_attach_endpoint(dev, &ep);
> -
> -		if (ret) {
> -			of_node_put(ep_np);
> -			return ret;
> -		}
> -	}
> +	remote = of_graph_get_remote_node(dev->dev->of_node, 0, 0);
> +	if (!remote)
> +		return -ENODEV;
>
> -	return 0;
> +	ret = atmel_hlcdc_attach_endpoint(dev, remote);
> +	of_node_put(remote);
> +	return ret;
>  }
> diff --git a/drivers/gpu/drm/bridge/nxp-ptn3460.c b/drivers/gpu/drm/bridge/nxp-ptn3460.c
> index 27f98c518dde..351704390d02 100644
> --- a/drivers/gpu/drm/bridge/nxp-ptn3460.c
> +++ b/drivers/gpu/drm/bridge/nxp-ptn3460.c
> @@ -20,8 +20,8 @@
>  #include <linux/module.h>
>  #include <linux/of.h>
>  #include <linux/of_gpio.h>
> -#include <linux/of_graph.h>
>
> +#include <drm/drm_of.h>
>  #include <drm/drm_panel.h>
>
>  #include "drm_crtc.h"
> @@ -292,7 +292,6 @@ static int ptn3460_probe(struct i2c_client *client,
>  {
>  	struct device *dev = &client->dev;
>  	struct ptn3460_bridge *ptn_bridge;
> -	struct device_node *endpoint, *panel_node;
>  	int ret;
>
>  	ptn_bridge = devm_kzalloc(dev, sizeof(*ptn_bridge), GFP_KERNEL);
> @@ -300,16 +299,9 @@ static int ptn3460_probe(struct i2c_client *client,
>  		return -ENOMEM;
>  	}
>
> -	endpoint = of_graph_get_next_endpoint(dev->of_node, NULL);
> -	if (endpoint) {
> -		panel_node = of_graph_get_remote_port_parent(endpoint);
> -		if (panel_node) {
> -			ptn_bridge->panel = of_drm_find_panel(panel_node);
> -			of_node_put(panel_node);
> -			if (!ptn_bridge->panel)
> -				return -EPROBE_DEFER;
> -		}
> -	}
> +	ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &ptn_bridge->panel, NULL);
> +	if (ret)
> +		return ret;
>
>  	ptn_bridge->client = client;
>
> diff --git a/drivers/gpu/drm/bridge/parade-ps8622.c b/drivers/gpu/drm/bridge/parade-ps8622.c
> index ac8cc5b50d9f..1dcec3b97e67 100644
> --- a/drivers/gpu/drm/bridge/parade-ps8622.c
> +++ b/drivers/gpu/drm/bridge/parade-ps8622.c
> @@ -22,10 +22,10 @@
>  #include <linux/module.h>
>  #include <linux/of.h>
>  #include <linux/of_device.h>
> -#include <linux/of_graph.h>
>  #include <linux/pm.h>
>  #include <linux/regulator/consumer.h>
>
> +#include <drm/drm_of.h>
>  #include <drm/drm_panel.h>
>
>  #include "drmP.h"
> @@ -536,7 +536,6 @@ static int ps8622_probe(struct i2c_client *client,
>  					const struct i2c_device_id *id)
>  {
>  	struct device *dev = &client->dev;
> -	struct device_node *endpoint, *panel_node;
>  	struct ps8622_bridge *ps8622;
>  	int ret;
>
> @@ -544,16 +543,9 @@ static int ps8622_probe(struct i2c_client *client,
>  	if (!ps8622)
>  		return -ENOMEM;
>
> -	endpoint = of_graph_get_next_endpoint(dev->of_node, NULL);
> -	if (endpoint) {
> -		panel_node = of_graph_get_remote_port_parent(endpoint);
> -		if (panel_node) {
> -			ps8622->panel = of_drm_find_panel(panel_node);
> -			of_node_put(panel_node);
> -			if (!ps8622->panel)
> -				return -EPROBE_DEFER;
> -		}
> -	}
> +	ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &ps8622->panel, NULL);
> +	if (ret)
> +		return ret;
>
>  	ps8622->client = client;
>
> diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c
> index de9ffb49e9f6..5c26488e7a2d 100644
> --- a/drivers/gpu/drm/bridge/tc358767.c
> +++ b/drivers/gpu/drm/bridge/tc358767.c
> @@ -1244,7 +1244,6 @@ static const struct regmap_config tc_regmap_config = {
>  static int tc_probe(struct i2c_client *client, const struct i2c_device_id *id)
>  {
>  	struct device *dev = &client->dev;
> -	struct device_node *ep;
>  	struct tc_data *tc;
>  	int ret;
>
> @@ -1255,29 +1254,9 @@ static int tc_probe(struct i2c_client *client, const struct i2c_device_id *id)
>  	tc->dev = dev;
>
>  	/* port@2 is the output port */
> -	ep = of_graph_get_endpoint_by_regs(dev->of_node, 2, -1);
> -	if (ep) {
> -		struct device_node *remote;
> -
> -		remote = of_graph_get_remote_port_parent(ep);
> -		if (!remote) {
> -			dev_warn(dev, "endpoint %s not connected\n",
> -				 ep->full_name);
> -			of_node_put(ep);
> -			return -ENODEV;
> -		}
> -		of_node_put(ep);
> -		tc->panel = of_drm_find_panel(remote);
> -		if (tc->panel) {
> -			dev_dbg(dev, "found panel %s\n", remote->full_name);
> -		} else {
> -			dev_dbg(dev, "waiting for panel %s\n",
> -				remote->full_name);
> -			of_node_put(remote);
> -			return -EPROBE_DEFER;
> -		}
> -		of_node_put(remote);
> -	}
> +	ret = drm_of_find_panel_or_bridge(dev->of_node, 2, 0, &tc->panel, NULL);
> +	if (ret)
> +		return ret;
>
>  	/* Shut down GPIO is optional */
>  	tc->sd_gpio = devm_gpiod_get_optional(dev, "shutdown", GPIOD_OUT_HIGH);
> diff --git a/drivers/gpu/drm/exynos/exynos_dp.c b/drivers/gpu/drm/exynos/exynos_dp.c
> index 528229faffe4..376c941c5189 100644
> --- a/drivers/gpu/drm/exynos/exynos_dp.c
> +++ b/drivers/gpu/drm/exynos/exynos_dp.c
> @@ -23,6 +23,7 @@
>  #include <drm/drmP.h>
>  #include <drm/drm_crtc.h>
>  #include <drm/drm_crtc_helper.h>
> +#include <drm/drm_of.h>
>  #include <drm/drm_panel.h>
>
>  #include <drm/bridge/analogix_dp.h>
> @@ -215,8 +216,11 @@ static const struct component_ops exynos_dp_ops = {
>  static int exynos_dp_probe(struct platform_device *pdev)
>  {
>  	struct device *dev = &pdev->dev;
> -	struct device_node *np = NULL, *endpoint = NULL;
> +	struct device_node *np;
>  	struct exynos_dp_device *dp;
> +	struct drm_panel *panel;
> +	struct drm_bridge *bridge;
> +	int ret;
>
>  	dp = devm_kzalloc(&pdev->dev, sizeof(struct exynos_dp_device),
>  			  GFP_KERNEL);
> @@ -240,28 +244,13 @@ static int exynos_dp_probe(struct platform_device *pdev)
>  		goto out;
>  	}
>
> -	endpoint = of_graph_get_next_endpoint(dev->of_node, NULL);
> -	if (endpoint) {
> -		np = of_graph_get_remote_port_parent(endpoint);
> -		if (np) {
> -			/* The remote port can be either a panel or a bridge */
> -			dp->plat_data.panel = of_drm_find_panel(np);
> -			if (!dp->plat_data.panel) {
> -				dp->ptn_bridge = of_drm_find_bridge(np);
> -				if (!dp->ptn_bridge) {
> -					of_node_put(np);
> -					return -EPROBE_DEFER;
> -				}
> -			}
> -			of_node_put(np);
> -		} else {
> -			DRM_ERROR("no remote endpoint device node found.\n");
> -			return -EINVAL;
> -		}
> -	} else {
> -		DRM_ERROR("no port endpoint subnode found.\n");
> -		return -EINVAL;
> -	}
> +	ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &panel, &bridge);
> +	if (ret)
> +		return ret;
> +
> +	/* The remote port can be either a panel or a bridge */
> +	dp->plat_data.panel = panel;
> +	dp->ptn_bridge = bridge;
>
>  out:
>  	return component_add(&pdev->dev, &exynos_dp_ops);
> diff --git a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c
> index 05a8ee106879..3cae7dd75834 100644
> --- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c
> +++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c
> @@ -15,6 +15,7 @@
>  #include <drm/drmP.h>
>  #include <drm/drm_atomic_helper.h>
>  #include <drm/drm_crtc_helper.h>
> +#include <drm/drm_of.h>
>  #include <drm/drm_panel.h>
>
>  #include "fsl_dcu_drm_drv.h"
> @@ -141,35 +142,11 @@ static int fsl_dcu_attach_panel(struct fsl_dcu_drm_device *fsl_dev,
>  	return ret;
>  }
>
> -static int fsl_dcu_attach_endpoint(struct fsl_dcu_drm_device *fsl_dev,
> -				   const struct of_endpoint *ep)
> -{
> -	struct drm_bridge *bridge;
> -	struct device_node *np;
> -
> -	np = of_graph_get_remote_port_parent(ep->local_node);
> -
> -	fsl_dev->connector.panel = of_drm_find_panel(np);
> -	if (fsl_dev->connector.panel) {
> -		of_node_put(np);
> -		return fsl_dcu_attach_panel(fsl_dev, fsl_dev->connector.panel);
> -	}
> -
> -	bridge = of_drm_find_bridge(np);
> -	of_node_put(np);
> -	if (!bridge)
> -		return -ENODEV;
> -
> -	fsl_dev->encoder.bridge = bridge;
> -	bridge->encoder = &fsl_dev->encoder;
> -
> -	return drm_bridge_attach(fsl_dev->drm, bridge);
> -}
> -
>  int fsl_dcu_create_outputs(struct fsl_dcu_drm_device *fsl_dev)
>  {
> -	struct of_endpoint ep;
> -	struct device_node *ep_node, *panel_node;
> +	struct device_node *panel_node;
> +	struct drm_bridge *bridge;
> +	struct drm_panel *panel;
>  	int ret;
>
>  	/* This is for backward compatibility */
> @@ -182,14 +159,16 @@ int fsl_dcu_create_outputs(struct fsl_dcu_drm_device *fsl_dev)
>  		return fsl_dcu_attach_panel(fsl_dev, fsl_dev->connector.panel);
>  	}
>
> -	ep_node = of_graph_get_next_endpoint(fsl_dev->np, NULL);
> -	if (!ep_node)
> -		return -ENODEV;
> -
> -	ret = of_graph_parse_endpoint(ep_node, &ep);
> -	of_node_put(ep_node);
> +	ret = drm_of_find_panel_or_bridge(fsl_dev->np, 0, 0, &panel, &bridge);
>  	if (ret)
> -		return -ENODEV;
> +		return ret;
>
> -	return fsl_dcu_attach_endpoint(fsl_dev, &ep);
> +	if (panel) {
> +		fsl_dev->connector.panel = panel;
> +		return fsl_dcu_attach_panel(fsl_dev, panel);
> +	}
> +
> +	fsl_dev->encoder.bridge = bridge;
> +	bridge->encoder = &fsl_dev->encoder;
> +	return drm_bridge_attach(fsl_dev->drm, bridge);
>  }
> diff --git a/drivers/gpu/drm/hisilicon/kirin/dw_drm_dsi.c b/drivers/gpu/drm/hisilicon/kirin/dw_drm_dsi.c
> index 998452ad0fcb..0f23e2c55862 100644
> --- a/drivers/gpu/drm/hisilicon/kirin/dw_drm_dsi.c
> +++ b/drivers/gpu/drm/hisilicon/kirin/dw_drm_dsi.c
> @@ -17,7 +17,6 @@
>
>  #include <linux/clk.h>
>  #include <linux/component.h>
> -#include <linux/of_graph.h>
>
>  #include <drm/drm_of.h>
>  #include <drm/drm_crtc_helper.h>
> @@ -757,34 +756,16 @@ static int dsi_parse_dt(struct platform_device *pdev, struct dw_dsi *dsi)
>  {
>  	struct dsi_hw_ctx *ctx = dsi->ctx;
>  	struct device_node *np = pdev->dev.of_node;
> -	struct device_node *endpoint, *bridge_node;
> -	struct drm_bridge *bridge;
>  	struct resource *res;
> +	int ret;
>
>  	/*
>  	 * Get the endpoint node. In our case, dsi has one output port1
>  	 * to which the external HDMI bridge is connected.
>  	 */
> -	endpoint = of_graph_get_endpoint_by_regs(np, 1, -1);
> -	if (!endpoint) {
> -		DRM_ERROR("no valid endpoint node\n");
> -		return -ENODEV;
> -	}
> -	of_node_put(endpoint);
> -
> -	bridge_node = of_graph_get_remote_port_parent(endpoint);
> -	if (!bridge_node) {
> -		DRM_ERROR("no valid bridge node\n");
> -		return -ENODEV;
> -	}
> -	of_node_put(bridge_node);
> -
> -	bridge = of_drm_find_bridge(bridge_node);
> -	if (!bridge) {
> -		DRM_INFO("wait for external HDMI bridge driver.\n");
> -		return -EPROBE_DEFER;
> -	}
> -	dsi->bridge = bridge;
> +	ret = drm_of_find_panel_or_bridge(np, 0, 0, NULL, &dsi->bridge);
> +	if (ret)
> +		return ret;
>
>  	ctx->pclk = devm_clk_get(&pdev->dev, "pclk");
>  	if (IS_ERR(ctx->pclk)) {
> diff --git a/drivers/gpu/drm/imx/imx-ldb.c b/drivers/gpu/drm/imx/imx-ldb.c
> index 516d06490465..506d5c1d1263 100644
> --- a/drivers/gpu/drm/imx/imx-ldb.c
> +++ b/drivers/gpu/drm/imx/imx-ldb.c
> @@ -649,7 +649,6 @@ static int imx_ldb_bind(struct device *dev, struct device *master, void *data)
>
>  	for_each_child_of_node(np, child) {
>  		struct imx_ldb_channel *channel;
> -		struct device_node *ep;
>  		int bus_format;
>
>  		ret = of_property_read_u32(child, "reg", &i);
> @@ -673,27 +672,11 @@ static int imx_ldb_bind(struct device *dev, struct device *master, void *data)
>  		 * The output port is port@4 with an external 4-port mux or
>  		 * port@2 with the internal 2-port mux.
>  		 */
> -		ep = of_graph_get_endpoint_by_regs(child,
> -						   imx_ldb->lvds_mux ? 4 : 2,
> -						   -1);
> -		if (ep) {
> -			struct device_node *remote;
> -
> -			remote = of_graph_get_remote_port_parent(ep);
> -			of_node_put(ep);
> -			if (remote) {
> -				channel->panel = of_drm_find_panel(remote);
> -				channel->bridge = of_drm_find_bridge(remote);
> -			} else
> -				return -EPROBE_DEFER;
> -			of_node_put(remote);
> -
> -			if (!channel->panel && !channel->bridge) {
> -				dev_err(dev, "panel/bridge not found: %s\n",
> -					remote->full_name);
> -				return -EPROBE_DEFER;
> -			}
> -		}
> +		ret = drm_of_find_panel_or_bridge(child,
> +						  imx_ldb->lvds_mux ? 4 : 2, 0,
> +						  &channel->panel, &channel->bridge);
> +		if (ret)
> +			return ret;
>
>  		/* panel ddc only if there is no bridge */
>  		if (!channel->bridge) {
> diff --git a/drivers/gpu/drm/imx/parallel-display.c b/drivers/gpu/drm/imx/parallel-display.c
> index 8582a83c0d9b..92336f38c55e 100644
> --- a/drivers/gpu/drm/imx/parallel-display.c
> +++ b/drivers/gpu/drm/imx/parallel-display.c
> @@ -19,10 +19,10 @@
>  #include <drm/drm_atomic_helper.h>
>  #include <drm/drm_fb_helper.h>
>  #include <drm/drm_crtc_helper.h>
> +#include <drm/drm_of.h>
>  #include <drm/drm_panel.h>
>  #include <linux/videodev2.h>
>  #include <video/of_display_timing.h>
> -#include <linux/of_graph.h>
>
>  #include "imx-drm.h"
>
> @@ -210,7 +210,6 @@ static int imx_pd_bind(struct device *dev, struct device *master, void *data)
>  {
>  	struct drm_device *drm = data;
>  	struct device_node *np = dev->of_node;
> -	struct device_node *ep;
>  	const u8 *edidp;
>  	struct imx_parallel_display *imxpd;
>  	int ret;
> @@ -239,36 +238,9 @@ static int imx_pd_bind(struct device *dev, struct device *master, void *data)
>  	imxpd->bus_format = bus_format;
>
>  	/* port@1 is the output port */
> -	ep = of_graph_get_endpoint_by_regs(np, 1, -1);
> -	if (ep) {
> -		struct device_node *remote;
> -
> -		remote = of_graph_get_remote_port_parent(ep);
> -		if (!remote) {
> -			dev_warn(dev, "endpoint %s not connected\n",
> -				 ep->full_name);
> -			of_node_put(ep);
> -			return -ENODEV;
> -		}
> -		of_node_put(ep);
> -
> -		imxpd->panel = of_drm_find_panel(remote);
> -		if (imxpd->panel) {
> -			dev_dbg(dev, "found panel %s\n", remote->full_name);
> -		} else {
> -			imxpd->bridge = of_drm_find_bridge(remote);
> -			if (imxpd->bridge)
> -				dev_dbg(dev, "found bridge %s\n",
> -					remote->full_name);
> -		}
> -		if (!imxpd->panel && !imxpd->bridge) {
> -			dev_dbg(dev, "waiting for panel or bridge %s\n",
> -				remote->full_name);
> -			of_node_put(remote);
> -			return -EPROBE_DEFER;
> -		}
> -		of_node_put(remote);
> -	}
> +	ret = drm_of_find_panel_or_bridge(np, 1, 0, &imxpd->panel, &imxpd->bridge);
> +	if (ret)
> +		return ret;
>
>  	imxpd->dev = dev;
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
> index 2c42f90809d8..14140579f8d4 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dsi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
> @@ -16,11 +16,11 @@
>  #include <drm/drm_crtc_helper.h>
>  #include <drm/drm_mipi_dsi.h>
>  #include <drm/drm_panel.h>
> +#include <drm/drm_of.h>
>  #include <linux/clk.h>
>  #include <linux/component.h>
>  #include <linux/of.h>
>  #include <linux/of_platform.h>
> -#include <linux/of_graph.h>
>  #include <linux/phy/phy.h>
>  #include <linux/platform_device.h>
>  #include <video/videomode.h>
> @@ -819,7 +819,6 @@ static int mtk_dsi_probe(struct platform_device *pdev)
>  {
>  	struct mtk_dsi *dsi;
>  	struct device *dev = &pdev->dev;
> -	struct device_node *remote_node, *endpoint;
>  	struct resource *regs;
>  	int comp_id;
>  	int ret;
> @@ -831,22 +830,10 @@ static int mtk_dsi_probe(struct platform_device *pdev)
>  	dsi->host.ops = &mtk_dsi_ops;
>  	dsi->host.dev = dev;
>
> -	endpoint = of_graph_get_next_endpoint(dev->of_node, NULL);
> -	if (endpoint) {
> -		remote_node = of_graph_get_remote_port_parent(endpoint);
> -		if (!remote_node) {
> -			dev_err(dev, "No panel connected\n");
> -			return -ENODEV;
> -		}
> -
> -		dsi->bridge = of_drm_find_bridge(remote_node);
> -		dsi->panel = of_drm_find_panel(remote_node);
> -		of_node_put(remote_node);
> -		if (!dsi->bridge && !dsi->panel) {
> -			dev_info(dev, "Waiting for bridge or panel driver\n");
> -			return -EPROBE_DEFER;
> -		}
> -	}
> +	ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0,
> +					  &dsi->panel, &dsi->bridge);
> +	if (ret)
> +		return ret;
>
>  	dsi->engine_clk = devm_clk_get(dev, "engine");
>  	if (IS_ERR(dsi->engine_clk)) {
> diff --git a/drivers/gpu/drm/mxsfb/mxsfb_out.c b/drivers/gpu/drm/mxsfb/mxsfb_out.c
> index fa8d17399407..f7d729aa09bd 100644
> --- a/drivers/gpu/drm/mxsfb/mxsfb_out.c
> +++ b/drivers/gpu/drm/mxsfb/mxsfb_out.c
> @@ -19,6 +19,7 @@
>  #include <drm/drm_crtc_helper.h>
>  #include <drm/drm_fb_cma_helper.h>
>  #include <drm/drm_gem_cma_helper.h>
> +#include <drm/drm_of.h>
>  #include <drm/drm_panel.h>
>  #include <drm/drm_plane_helper.h>
>  #include <drm/drm_simple_kms_helper.h>
> @@ -82,20 +83,15 @@ static const struct drm_connector_funcs mxsfb_panel_connector_funcs = {
>  	.atomic_destroy_state	= drm_atomic_helper_connector_destroy_state,
>  };
>
> -static int mxsfb_attach_endpoint(struct drm_device *drm,
> -				 const struct of_endpoint *ep)
> +int mxsfb_create_output(struct drm_device *drm)
>  {
>  	struct mxsfb_drm_private *mxsfb = drm->dev_private;
> -	struct device_node *np;
>  	struct drm_panel *panel;
> -	int ret = -EPROBE_DEFER;
> -
> -	np = of_graph_get_remote_port_parent(ep->local_node);
> -	panel = of_drm_find_panel(np);
> -	of_node_put(np);
> +	int ret;
>
> -	if (!panel)
> -		return -EPROBE_DEFER;
> +	ret = drm_of_find_panel_or_bridge(drm->dev->of_node, 0, 0, &panel, NULL);
> +	if (ret)
> +		return ret;
>
>  	mxsfb->connector.dpms = DRM_MODE_DPMS_OFF;
>  	mxsfb->connector.polled = 0;
> @@ -109,23 +105,3 @@ static int mxsfb_attach_endpoint(struct drm_device *drm,
>
>  	return ret;
>  }
> -
> -int mxsfb_create_output(struct drm_device *drm)
> -{
> -	struct device_node *ep_np = NULL;
> -	struct of_endpoint ep;
> -	int ret;
> -
> -	for_each_endpoint_of_node(drm->dev->of_node, ep_np) {
> -		ret = of_graph_parse_endpoint(ep_np, &ep);
> -		if (!ret)
> -			ret = mxsfb_attach_endpoint(drm, &ep);
> -
> -		if (ret) {
> -			of_node_put(ep_np);
> -			return ret;
> -		}
> -	}
> -
> -	return 0;
> -}
> diff --git a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
> index 8548e8271639..615afad280a8 100644
> --- a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
> +++ b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
> @@ -428,31 +428,13 @@ static const struct component_ops rockchip_dp_component_ops = {
>  static int rockchip_dp_probe(struct platform_device *pdev)
>  {
>  	struct device *dev = &pdev->dev;
> -	struct device_node *panel_node, *port, *endpoint;
>  	struct drm_panel *panel = NULL;
>  	struct rockchip_dp_device *dp;
> +	int ret;
>
> -	port = of_graph_get_port_by_id(dev->of_node, 1);
> -	if (port) {
> -		endpoint = of_get_child_by_name(port, "endpoint");
> -		of_node_put(port);
> -		if (!endpoint) {
> -			dev_err(dev, "no output endpoint found\n");
> -			return -EINVAL;
> -		}
> -
> -		panel_node = of_graph_get_remote_port_parent(endpoint);
> -		of_node_put(endpoint);
> -		if (!panel_node) {
> -			dev_err(dev, "no output node found\n");
> -			return -EINVAL;
> -		}
> -
> -		panel = of_drm_find_panel(panel_node);
> -		of_node_put(panel_node);
> -		if (!panel)
> -			return -EPROBE_DEFER;
> -	}
> +	ret = drm_of_find_panel_or_bridge(dev->of_node, 1, 0, &panel, NULL);
> +	if (ret)
> +		return ret;
>
>  	dp = devm_kzalloc(dev, sizeof(*dp), GFP_KERNEL);
>  	if (!dp)
> diff --git a/drivers/gpu/drm/sun4i/sun4i_rgb.c b/drivers/gpu/drm/sun4i/sun4i_rgb.c
> index f5e86fe7750e..49daea05d325 100644
> --- a/drivers/gpu/drm/sun4i/sun4i_rgb.c
> +++ b/drivers/gpu/drm/sun4i/sun4i_rgb.c
> @@ -15,6 +15,7 @@
>  #include <drm/drmP.h>
>  #include <drm/drm_atomic_helper.h>
>  #include <drm/drm_crtc_helper.h>
> +#include <drm/drm_of.h>
>  #include <drm/drm_panel.h>
>
>  #include "sun4i_drv.h"
> @@ -217,9 +218,9 @@ int sun4i_rgb_init(struct drm_device *drm)
>  	rgb->drv = drv;
>  	encoder = &rgb->encoder;
>
> -	tcon->panel = sun4i_tcon_find_panel(tcon->dev->of_node);
> -	encoder->bridge = sun4i_tcon_find_bridge(tcon->dev->of_node);
> -	if (IS_ERR(tcon->panel) && IS_ERR(encoder->bridge)) {
> +	ret = drm_of_find_panel_or_bridge(tcon->dev->of_node, 1, 0,
> +					  &tcon->panel, &encoder->bridge);
> +	if (ret) {
>  		dev_info(drm->dev, "No panel or bridge found... RGB output disabled\n");
>  		return 0;
>  	}
> @@ -239,7 +240,7 @@ int sun4i_rgb_init(struct drm_device *drm)
>  	/* The RGB encoder can only work with the TCON channel 0 */
>  	rgb->encoder.possible_crtcs = BIT(0);
>
> -	if (!IS_ERR(tcon->panel)) {
> +	if (tcon->panel) {
>  		drm_connector_helper_add(&rgb->connector,
>  					 &sun4i_rgb_con_helper_funcs);
>  		ret = drm_connector_init(drm, &rgb->connector,
> @@ -260,7 +261,7 @@ int sun4i_rgb_init(struct drm_device *drm)
>  		}
>  	}
>
> -	if (!IS_ERR(encoder->bridge)) {
> +	if (encoder->bridge) {
>  		encoder->bridge->encoder = &rgb->encoder;
>
>  		ret = drm_bridge_attach(drm, encoder->bridge);
> @@ -268,8 +269,6 @@ int sun4i_rgb_init(struct drm_device *drm)
>  			dev_err(drm->dev, "Couldn't attach our bridge\n");
>  			goto err_cleanup_connector;
>  		}
> -	} else {
> -		encoder->bridge = NULL;
>  	}
>
>  	return 0;
> diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.c b/drivers/gpu/drm/sun4i/sun4i_tcon.c
> index ea2906f87cb9..2e4e365cecf9 100644
> --- a/drivers/gpu/drm/sun4i/sun4i_tcon.c
> +++ b/drivers/gpu/drm/sun4i/sun4i_tcon.c
> @@ -15,13 +15,12 @@
>  #include <drm/drm_crtc.h>
>  #include <drm/drm_crtc_helper.h>
>  #include <drm/drm_modes.h>
> -#include <drm/drm_panel.h>
> +#include <drm/drm_of.h>
>
>  #include <linux/component.h>
>  #include <linux/ioport.h>
>  #include <linux/of_address.h>
>  #include <linux/of_device.h>
> -#include <linux/of_graph.h>
>  #include <linux/of_irq.h>
>  #include <linux/regmap.h>
>  #include <linux/reset.h>
> @@ -405,74 +404,6 @@ static int sun4i_tcon_init_regmap(struct device *dev,
>  	return 0;
>  }
>
> -struct drm_panel *sun4i_tcon_find_panel(struct device_node *node)
> -{
> -	struct device_node *port, *remote, *child;
> -	struct device_node *end_node = NULL;
> -
> -	/* Inputs are listed first, then outputs */
> -	port = of_graph_get_port_by_id(node, 1);
> -
> -	/*
> -	 * Our first output is the RGB interface where the panel will
> -	 * be connected.
> -	 */
> -	for_each_child_of_node(port, child) {
> -		u32 reg;
> -
> -		of_property_read_u32(child, "reg", &reg);
> -		if (reg == 0)
> -			end_node = child;
> -	}
> -
> -	if (!end_node) {
> -		DRM_DEBUG_DRIVER("Missing panel endpoint\n");
> -		return ERR_PTR(-ENODEV);
> -	}
> -
> -	remote = of_graph_get_remote_port_parent(end_node);
> -	if (!remote) {
> -		DRM_DEBUG_DRIVER("Unable to parse remote node\n");
> -		return ERR_PTR(-EINVAL);
> -	}
> -
> -	return of_drm_find_panel(remote) ?: ERR_PTR(-EPROBE_DEFER);
> -}
> -
> -struct drm_bridge *sun4i_tcon_find_bridge(struct device_node *node)
> -{
> -	struct device_node *port, *remote, *child;
> -	struct device_node *end_node = NULL;
> -
> -	/* Inputs are listed first, then outputs */
> -	port = of_graph_get_port_by_id(node, 1);
> -
> -	/*
> -	 * Our first output is the RGB interface where the panel will
> -	 * be connected.
> -	 */
> -	for_each_child_of_node(port, child) {
> -		u32 reg;
> -
> -		of_property_read_u32(child, "reg", &reg);
> -		if (reg == 0)
> -			end_node = child;
> -	}
> -
> -	if (!end_node) {
> -		DRM_DEBUG_DRIVER("Missing bridge endpoint\n");
> -		return ERR_PTR(-ENODEV);
> -	}
> -
> -	remote = of_graph_get_remote_port_parent(end_node);
> -	if (!remote) {
> -		DRM_DEBUG_DRIVER("Enable to parse remote node\n");
> -		return ERR_PTR(-EINVAL);
> -	}
> -
> -	return of_drm_find_bridge(remote) ?: ERR_PTR(-EPROBE_DEFER);
> -}
> -
>  static int sun4i_tcon_bind(struct device *dev, struct device *master,
>  			   void *data)
>  {
> @@ -555,22 +486,11 @@ static int sun4i_tcon_probe(struct platform_device *pdev)
>  	struct device_node *node = pdev->dev.of_node;
>  	struct drm_bridge *bridge;
>  	struct drm_panel *panel;
> +	int ret;
>
> -	/*
> -	 * Neither the bridge or the panel is ready.
> -	 * Defer the probe.
> -	 */
> -	panel = sun4i_tcon_find_panel(node);
> -	bridge = sun4i_tcon_find_bridge(node);
> -
> -	/*
> -	 * If we don't have a panel endpoint, just go on
> -	 */
> -	if ((PTR_ERR(panel) == -EPROBE_DEFER) &&
> -	    (PTR_ERR(bridge) == -EPROBE_DEFER)) {
> -		DRM_DEBUG_DRIVER("Still waiting for our panel/bridge. Deferring...\n");
> -		return -EPROBE_DEFER;
> -	}
> +	ret = drm_of_find_panel_or_bridge(node, 1, 0, &panel, &bridge);
> +	if (ret == -EPROBE_DEFER)
> +		return ret;
>
>  	return component_add(&pdev->dev, &sun4i_tcon_ops);
>  }
> --
> 2.10.1
>

-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project

Re: [PATCH v2 5/6] drm: convert drivers to use drm_of_find_panel_or_bridge

[Boris Brezillon]

On Thu,  9 Feb 2017 13:05:57 -0600
Rob Herring <robh@kernel.org> wrote:

> Similar to the previous commit, convert drivers open coding OF graph
> parsing to use drm_of_find_panel_or_bridge instead.
> 
> This changes some error messages to debug messages (in the graph core).
> Graph connections are often "no connects" depending on the particular
> board, so we want to avoid spurious messages. Plus the kernel is not a
> DT validator.
> 
> Signed-off-by: Rob Herring <robh@kernel.org>
> ---
> v2:
> - fix wrong node ptr in imx-ldb
> - build fixes in kirin and imx drivers
> 
>  drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c | 64 ++++-------------
>  drivers/gpu/drm/bridge/nxp-ptn3460.c             | 16 ++---
>  drivers/gpu/drm/bridge/parade-ps8622.c           | 16 ++---
>  drivers/gpu/drm/bridge/tc358767.c                | 27 +------
>  drivers/gpu/drm/exynos/exynos_dp.c               | 35 ++++-----
>  drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c        | 49 ++++---------
>  drivers/gpu/drm/hisilicon/kirin/dw_drm_dsi.c     | 27 ++-----
>  drivers/gpu/drm/imx/imx-ldb.c                    | 27 ++-----
>  drivers/gpu/drm/imx/parallel-display.c           | 36 ++--------
>  drivers/gpu/drm/mediatek/mtk_dsi.c               | 23 ++----
>  drivers/gpu/drm/mxsfb/mxsfb_out.c                | 36 ++--------
>  drivers/gpu/drm/rockchip/analogix_dp-rockchip.c  | 26 ++-----
>  drivers/gpu/drm/sun4i/sun4i_rgb.c                | 13 ++--
>  drivers/gpu/drm/sun4i/sun4i_tcon.c               | 90 ++----------------------
>  14 files changed, 88 insertions(+), 397 deletions(-)
> 
> diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c
> index 6119b5085501..4614048a4935 100644
> --- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c
> +++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c
> @@ -22,7 +22,7 @@
>  #include <linux/of_graph.h>
> 
>  #include <drm/drmP.h>
> -#include <drm/drm_panel.h>
> +#include <drm/drm_of.h>
> 
>  #include "atmel_hlcdc_dc.h"
> 
> @@ -152,29 +152,11 @@ static const struct drm_connector_funcs atmel_hlcdc_panel_connector_funcs = {
>  	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
>  };
> 
> -static int atmel_hlcdc_check_endpoint(struct drm_device *dev,
> -				      const struct of_endpoint *ep)
> -{
> -	struct device_node *np;
> -	void *obj;
> -
> -	np = of_graph_get_remote_port_parent(ep->local_node);
> -
> -	obj = of_drm_find_panel(np);
> -	if (!obj)
> -		obj = of_drm_find_bridge(np);
> -
> -	of_node_put(np);
> -
> -	return obj ? 0 : -EPROBE_DEFER;
> -}
> -
>  static int atmel_hlcdc_attach_endpoint(struct drm_device *dev,
> -				       const struct of_endpoint *ep)
> +				       const struct device_node *np)
>  {
>  	struct atmel_hlcdc_dc *dc = dev->dev_private;
>  	struct atmel_hlcdc_rgb_output *output;
> -	struct device_node *np;
>  	struct drm_panel *panel;
>  	struct drm_bridge *bridge;
>  	int ret;
> @@ -195,13 +177,11 @@ static int atmel_hlcdc_attach_endpoint(struct drm_device *dev,
> 
>  	output->encoder.possible_crtcs = 0x1;
> 
> -	np = of_graph_get_remote_port_parent(ep->local_node);
> -
> -	ret = -EPROBE_DEFER;
> +	ret = drm_of_find_panel_or_bridge(np, 0, 0, &panel, &bridge);
> +	if (ret)
> +		return ret;
> 
> -	panel = of_drm_find_panel(np);
>  	if (panel) {
> -		of_node_put(np);
>  		output->connector.dpms = DRM_MODE_DPMS_OFF;
>  		output->connector.polled = DRM_CONNECTOR_POLL_CONNECT;
>  		drm_connector_helper_add(&output->connector,
> @@ -226,9 +206,6 @@ static int atmel_hlcdc_attach_endpoint(struct drm_device *dev,
>  		return 0;
>  	}
> 
> -	bridge = of_drm_find_bridge(np);
> -	of_node_put(np);
> -
>  	if (bridge) {
>  		output->encoder.bridge = bridge;
>  		bridge->encoder = &output->encoder;
> @@ -245,31 +222,14 @@ static int atmel_hlcdc_attach_endpoint(struct drm_device *dev,
> 
>  int atmel_hlcdc_create_outputs(struct drm_device *dev)
>  {
> -	struct device_node *ep_np = NULL;
> -	struct of_endpoint ep;
> +	struct device_node *remote;
>  	int ret;
> 
> -	for_each_endpoint_of_node(dev->dev->of_node, ep_np) {
> -		ret = of_graph_parse_endpoint(ep_np, &ep);
> -		if (!ret)
> -			ret = atmel_hlcdc_check_endpoint(dev, &ep);
> -
> -		if (ret) {
> -			of_node_put(ep_np);
> -			return ret;
> -		}
> -	}
> -
> -	for_each_endpoint_of_node(dev->dev->of_node, ep_np) {
> -		ret = of_graph_parse_endpoint(ep_np, &ep);
> -		if (!ret)
> -			ret = atmel_hlcdc_attach_endpoint(dev, &ep);
> -
> -		if (ret) {
> -			of_node_put(ep_np);
> -			return ret;
> -		}
> -	}
> +	remote = of_graph_get_remote_node(dev->dev->of_node, 0, 0);
> +	if (!remote)
> +		return -ENODEV;

I know you said ports and endpoints should be statically assigned and
documented in the DT bindings doc, while I agree with the ports part,
having static endpoints numbering is not possible in some cases.

Here the port exposed by the Atmel display controller is a raw RGB (or
parallel RGB) port, and you can connect as many devices as you want to
this port. For example, on some atmel boards with have 1 bridge ans 1
panel connected to the same port (but we could have X bridges and Y
panels and it would work the same way), hence the
for_each_endpoint_of_node() loop used to connect panels and bridges to
the controller.
With your change, my use case no longer works, I can either have the
panel or the bridge, but not both.

Something like the following would solve the problem:

	endpoint = 0;
	while (true) {
		remote = of_graph_get_remote_node(dev->dev->of_node, 0,
						  endpoint++);
		if (!remote)
			break;

		ret = atmel_hlcdc_attach_endpoint(dev, remote);
		if (ret)
			return ret;
	}

	if (!endpoint)
		return -ENODEV;

	return 0;

If you're not happy with the 'random number of endpoints' thing, can
you suggest another approach to handle the raw RGB port case (I'm
pretty sure I'm not the only one to have this use case).

Re: [PATCH v2 5/6] drm: convert drivers to use drm_of_find_panel_or_bridge

[Boris Brezillon]

On Thu,  9 Feb 2017 13:05:57 -0600
Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org> wrote:

> Similar to the previous commit, convert drivers open coding OF graph
> parsing to use drm_of_find_panel_or_bridge instead.
> 
> This changes some error messages to debug messages (in the graph core).
> Graph connections are often "no connects" depending on the particular
> board, so we want to avoid spurious messages. Plus the kernel is not a
> DT validator.
> 
> Signed-off-by: Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
> ---
> v2:
> - fix wrong node ptr in imx-ldb
> - build fixes in kirin and imx drivers
> 
>  drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c | 64 ++++-------------
>  drivers/gpu/drm/bridge/nxp-ptn3460.c             | 16 ++---
>  drivers/gpu/drm/bridge/parade-ps8622.c           | 16 ++---
>  drivers/gpu/drm/bridge/tc358767.c                | 27 +------
>  drivers/gpu/drm/exynos/exynos_dp.c               | 35 ++++-----
>  drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c        | 49 ++++---------
>  drivers/gpu/drm/hisilicon/kirin/dw_drm_dsi.c     | 27 ++-----
>  drivers/gpu/drm/imx/imx-ldb.c                    | 27 ++-----
>  drivers/gpu/drm/imx/parallel-display.c           | 36 ++--------
>  drivers/gpu/drm/mediatek/mtk_dsi.c               | 23 ++----
>  drivers/gpu/drm/mxsfb/mxsfb_out.c                | 36 ++--------
>  drivers/gpu/drm/rockchip/analogix_dp-rockchip.c  | 26 ++-----
>  drivers/gpu/drm/sun4i/sun4i_rgb.c                | 13 ++--
>  drivers/gpu/drm/sun4i/sun4i_tcon.c               | 90 ++----------------------
>  14 files changed, 88 insertions(+), 397 deletions(-)
> 
> diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c
> index 6119b5085501..4614048a4935 100644
> --- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c
> +++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c
> @@ -22,7 +22,7 @@
>  #include <linux/of_graph.h>
> 
>  #include <drm/drmP.h>
> -#include <drm/drm_panel.h>
> +#include <drm/drm_of.h>
> 
>  #include "atmel_hlcdc_dc.h"
> 
> @@ -152,29 +152,11 @@ static const struct drm_connector_funcs atmel_hlcdc_panel_connector_funcs = {
>  	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
>  };
> 
> -static int atmel_hlcdc_check_endpoint(struct drm_device *dev,
> -				      const struct of_endpoint *ep)
> -{
> -	struct device_node *np;
> -	void *obj;
> -
> -	np = of_graph_get_remote_port_parent(ep->local_node);
> -
> -	obj = of_drm_find_panel(np);
> -	if (!obj)
> -		obj = of_drm_find_bridge(np);
> -
> -	of_node_put(np);
> -
> -	return obj ? 0 : -EPROBE_DEFER;
> -}
> -
>  static int atmel_hlcdc_attach_endpoint(struct drm_device *dev,
> -				       const struct of_endpoint *ep)
> +				       const struct device_node *np)
>  {
>  	struct atmel_hlcdc_dc *dc = dev->dev_private;
>  	struct atmel_hlcdc_rgb_output *output;
> -	struct device_node *np;
>  	struct drm_panel *panel;
>  	struct drm_bridge *bridge;
>  	int ret;
> @@ -195,13 +177,11 @@ static int atmel_hlcdc_attach_endpoint(struct drm_device *dev,
> 
>  	output->encoder.possible_crtcs = 0x1;
> 
> -	np = of_graph_get_remote_port_parent(ep->local_node);
> -
> -	ret = -EPROBE_DEFER;
> +	ret = drm_of_find_panel_or_bridge(np, 0, 0, &panel, &bridge);
> +	if (ret)
> +		return ret;
> 
> -	panel = of_drm_find_panel(np);
>  	if (panel) {
> -		of_node_put(np);
>  		output->connector.dpms = DRM_MODE_DPMS_OFF;
>  		output->connector.polled = DRM_CONNECTOR_POLL_CONNECT;
>  		drm_connector_helper_add(&output->connector,
> @@ -226,9 +206,6 @@ static int atmel_hlcdc_attach_endpoint(struct drm_device *dev,
>  		return 0;
>  	}
> 
> -	bridge = of_drm_find_bridge(np);
> -	of_node_put(np);
> -
>  	if (bridge) {
>  		output->encoder.bridge = bridge;
>  		bridge->encoder = &output->encoder;
> @@ -245,31 +222,14 @@ static int atmel_hlcdc_attach_endpoint(struct drm_device *dev,
> 
>  int atmel_hlcdc_create_outputs(struct drm_device *dev)
>  {
> -	struct device_node *ep_np = NULL;
> -	struct of_endpoint ep;
> +	struct device_node *remote;
>  	int ret;
> 
> -	for_each_endpoint_of_node(dev->dev->of_node, ep_np) {
> -		ret = of_graph_parse_endpoint(ep_np, &ep);
> -		if (!ret)
> -			ret = atmel_hlcdc_check_endpoint(dev, &ep);
> -
> -		if (ret) {
> -			of_node_put(ep_np);
> -			return ret;
> -		}
> -	}
> -
> -	for_each_endpoint_of_node(dev->dev->of_node, ep_np) {
> -		ret = of_graph_parse_endpoint(ep_np, &ep);
> -		if (!ret)
> -			ret = atmel_hlcdc_attach_endpoint(dev, &ep);
> -
> -		if (ret) {
> -			of_node_put(ep_np);
> -			return ret;
> -		}
> -	}
> +	remote = of_graph_get_remote_node(dev->dev->of_node, 0, 0);
> +	if (!remote)
> +		return -ENODEV;

I know you said ports and endpoints should be statically assigned and
documented in the DT bindings doc, while I agree with the ports part,
having static endpoints numbering is not possible in some cases.

Here the port exposed by the Atmel display controller is a raw RGB (or
parallel RGB) port, and you can connect as many devices as you want to
this port. For example, on some atmel boards with have 1 bridge ans 1
panel connected to the same port (but we could have X bridges and Y
panels and it would work the same way), hence the
for_each_endpoint_of_node() loop used to connect panels and bridges to
the controller.
With your change, my use case no longer works, I can either have the
panel or the bridge, but not both.

Something like the following would solve the problem:

	endpoint = 0;
	while (true) {
		remote = of_graph_get_remote_node(dev->dev->of_node, 0,
						  endpoint++);
		if (!remote)
			break;

		ret = atmel_hlcdc_attach_endpoint(dev, remote);
		if (ret)
			return ret;
	}

	if (!endpoint)
		return -ENODEV;

	return 0;

If you're not happy with the 'random number of endpoints' thing, can
you suggest another approach to handle the raw RGB port case (I'm
pretty sure I'm not the only one to have this use case).
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Re: [PATCH v2 5/6] drm: convert drivers to use drm_of_find_panel_or_bridge

[Rob Herring]

On Mon, Feb 13, 2017 at 1:47 AM, Boris Brezillon
<boris.brezillon@free-electrons.com> wrote:
> On Thu,  9 Feb 2017 13:05:57 -0600
> Rob Herring <robh@kernel.org> wrote:
>
>> Similar to the previous commit, convert drivers open coding OF graph
>> parsing to use drm_of_find_panel_or_bridge instead.
>>
>> This changes some error messages to debug messages (in the graph core).
>> Graph connections are often "no connects" depending on the particular
>> board, so we want to avoid spurious messages. Plus the kernel is not a
>> DT validator.
>>
>> Signed-off-by: Rob Herring <robh@kernel.org>
>> ---
>> v2:
>> - fix wrong node ptr in imx-ldb
>> - build fixes in kirin and imx drivers
>>
>>  drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c | 64 ++++-------------
>>  drivers/gpu/drm/bridge/nxp-ptn3460.c             | 16 ++---
>>  drivers/gpu/drm/bridge/parade-ps8622.c           | 16 ++---
>>  drivers/gpu/drm/bridge/tc358767.c                | 27 +------
>>  drivers/gpu/drm/exynos/exynos_dp.c               | 35 ++++-----
>>  drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c        | 49 ++++---------
>>  drivers/gpu/drm/hisilicon/kirin/dw_drm_dsi.c     | 27 ++-----
>>  drivers/gpu/drm/imx/imx-ldb.c                    | 27 ++-----
>>  drivers/gpu/drm/imx/parallel-display.c           | 36 ++--------
>>  drivers/gpu/drm/mediatek/mtk_dsi.c               | 23 ++----
>>  drivers/gpu/drm/mxsfb/mxsfb_out.c                | 36 ++--------
>>  drivers/gpu/drm/rockchip/analogix_dp-rockchip.c  | 26 ++-----
>>  drivers/gpu/drm/sun4i/sun4i_rgb.c                | 13 ++--
>>  drivers/gpu/drm/sun4i/sun4i_tcon.c               | 90 ++----------------------
>>  14 files changed, 88 insertions(+), 397 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c
>> index 6119b5085501..4614048a4935 100644
>> --- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c
>> +++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c
>> @@ -22,7 +22,7 @@
>>  #include <linux/of_graph.h>
>>
>>  #include <drm/drmP.h>
>> -#include <drm/drm_panel.h>
>> +#include <drm/drm_of.h>
>>
>>  #include "atmel_hlcdc_dc.h"
>>
>> @@ -152,29 +152,11 @@ static const struct drm_connector_funcs atmel_hlcdc_panel_connector_funcs = {
>>       .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
>>  };
>>
>> -static int atmel_hlcdc_check_endpoint(struct drm_device *dev,
>> -                                   const struct of_endpoint *ep)
>> -{
>> -     struct device_node *np;
>> -     void *obj;
>> -
>> -     np = of_graph_get_remote_port_parent(ep->local_node);
>> -
>> -     obj = of_drm_find_panel(np);
>> -     if (!obj)
>> -             obj = of_drm_find_bridge(np);
>> -
>> -     of_node_put(np);
>> -
>> -     return obj ? 0 : -EPROBE_DEFER;
>> -}
>> -
>>  static int atmel_hlcdc_attach_endpoint(struct drm_device *dev,
>> -                                    const struct of_endpoint *ep)
>> +                                    const struct device_node *np)
>>  {
>>       struct atmel_hlcdc_dc *dc = dev->dev_private;
>>       struct atmel_hlcdc_rgb_output *output;
>> -     struct device_node *np;
>>       struct drm_panel *panel;
>>       struct drm_bridge *bridge;
>>       int ret;
>> @@ -195,13 +177,11 @@ static int atmel_hlcdc_attach_endpoint(struct drm_device *dev,
>>
>>       output->encoder.possible_crtcs = 0x1;
>>
>> -     np = of_graph_get_remote_port_parent(ep->local_node);
>> -
>> -     ret = -EPROBE_DEFER;
>> +     ret = drm_of_find_panel_or_bridge(np, 0, 0, &panel, &bridge);
>> +     if (ret)
>> +             return ret;
>>
>> -     panel = of_drm_find_panel(np);
>>       if (panel) {
>> -             of_node_put(np);
>>               output->connector.dpms = DRM_MODE_DPMS_OFF;
>>               output->connector.polled = DRM_CONNECTOR_POLL_CONNECT;
>>               drm_connector_helper_add(&output->connector,
>> @@ -226,9 +206,6 @@ static int atmel_hlcdc_attach_endpoint(struct drm_device *dev,
>>               return 0;
>>       }
>>
>> -     bridge = of_drm_find_bridge(np);
>> -     of_node_put(np);
>> -
>>       if (bridge) {
>>               output->encoder.bridge = bridge;
>>               bridge->encoder = &output->encoder;
>> @@ -245,31 +222,14 @@ static int atmel_hlcdc_attach_endpoint(struct drm_device *dev,
>>
>>  int atmel_hlcdc_create_outputs(struct drm_device *dev)
>>  {
>> -     struct device_node *ep_np = NULL;
>> -     struct of_endpoint ep;
>> +     struct device_node *remote;
>>       int ret;
>>
>> -     for_each_endpoint_of_node(dev->dev->of_node, ep_np) {
>> -             ret = of_graph_parse_endpoint(ep_np, &ep);
>> -             if (!ret)
>> -                     ret = atmel_hlcdc_check_endpoint(dev, &ep);
>> -
>> -             if (ret) {
>> -                     of_node_put(ep_np);
>> -                     return ret;
>> -             }
>> -     }
>> -
>> -     for_each_endpoint_of_node(dev->dev->of_node, ep_np) {
>> -             ret = of_graph_parse_endpoint(ep_np, &ep);
>> -             if (!ret)
>> -                     ret = atmel_hlcdc_attach_endpoint(dev, &ep);
>> -
>> -             if (ret) {
>> -                     of_node_put(ep_np);
>> -                     return ret;
>> -             }
>> -     }
>> +     remote = of_graph_get_remote_node(dev->dev->of_node, 0, 0);
>> +     if (!remote)
>> +             return -ENODEV;
>
> I know you said ports and endpoints should be statically assigned and
> documented in the DT bindings doc, while I agree with the ports part,
> having static endpoints numbering is not possible in some cases.

Okay, I guess it's more that ports are defined. For cases, where you
have a 1 to N connection like this, then yes it's okay.

> Here the port exposed by the Atmel display controller is a raw RGB (or
> parallel RGB) port, and you can connect as many devices as you want to
> this port. For example, on some atmel boards with have 1 bridge ans 1
> panel connected to the same port (but we could have X bridges and Y
> panels and it would work the same way), hence the
> for_each_endpoint_of_node() loop used to connect panels and bridges to
> the controller.
> With your change, my use case no longer works, I can either have the
> panel or the bridge, but not both.
>
> Something like the following would solve the problem:
>
>         endpoint = 0;
>         while (true) {
>                 remote = of_graph_get_remote_node(dev->dev->of_node, 0,
>                                                   endpoint++);
>                 if (!remote)
>                         break;
>
>                 ret = atmel_hlcdc_attach_endpoint(dev, remote);
>                 if (ret)
>                         return ret;
>         }
>
>         if (!endpoint)
>                 return -ENODEV;
>
>         return 0;
>
> If you're not happy with the 'random number of endpoints' thing, can
> you suggest another approach to handle the raw RGB port case (I'm
> pretty sure I'm not the only one to have this use case).

This seems fine to me. The question I have is whether to handle this
loop in the core and whether to have a loop iterator. There's a few
cases of iterating thru all the ports getting remote nodes that I was
thinking about how to handle too.

Rob

Re: [PATCH v2 5/6] drm: convert drivers to use drm_of_find_panel_or_bridge

[Rob Herring]

On Mon, Feb 13, 2017 at 1:47 AM, Boris Brezillon
<boris.brezillon@free-electrons.com> wrote:
> On Thu,  9 Feb 2017 13:05:57 -0600
> Rob Herring <robh@kernel.org> wrote:
>
>> Similar to the previous commit, convert drivers open coding OF graph
>> parsing to use drm_of_find_panel_or_bridge instead.
>>
>> This changes some error messages to debug messages (in the graph core).
>> Graph connections are often "no connects" depending on the particular
>> board, so we want to avoid spurious messages. Plus the kernel is not a
>> DT validator.
>>
>> Signed-off-by: Rob Herring <robh@kernel.org>
>> ---
>> v2:
>> - fix wrong node ptr in imx-ldb
>> - build fixes in kirin and imx drivers
>>
>>  drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c | 64 ++++-------------
>>  drivers/gpu/drm/bridge/nxp-ptn3460.c             | 16 ++---
>>  drivers/gpu/drm/bridge/parade-ps8622.c           | 16 ++---
>>  drivers/gpu/drm/bridge/tc358767.c                | 27 +------
>>  drivers/gpu/drm/exynos/exynos_dp.c               | 35 ++++-----
>>  drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c        | 49 ++++---------
>>  drivers/gpu/drm/hisilicon/kirin/dw_drm_dsi.c     | 27 ++-----
>>  drivers/gpu/drm/imx/imx-ldb.c                    | 27 ++-----
>>  drivers/gpu/drm/imx/parallel-display.c           | 36 ++--------
>>  drivers/gpu/drm/mediatek/mtk_dsi.c               | 23 ++----
>>  drivers/gpu/drm/mxsfb/mxsfb_out.c                | 36 ++--------
>>  drivers/gpu/drm/rockchip/analogix_dp-rockchip.c  | 26 ++-----
>>  drivers/gpu/drm/sun4i/sun4i_rgb.c                | 13 ++--
>>  drivers/gpu/drm/sun4i/sun4i_tcon.c               | 90 ++----------------------
>>  14 files changed, 88 insertions(+), 397 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c
>> index 6119b5085501..4614048a4935 100644
>> --- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c
>> +++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_output.c
>> @@ -22,7 +22,7 @@
>>  #include <linux/of_graph.h>
>>
>>  #include <drm/drmP.h>
>> -#include <drm/drm_panel.h>
>> +#include <drm/drm_of.h>
>>
>>  #include "atmel_hlcdc_dc.h"
>>
>> @@ -152,29 +152,11 @@ static const struct drm_connector_funcs atmel_hlcdc_panel_connector_funcs = {
>>       .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
>>  };
>>
>> -static int atmel_hlcdc_check_endpoint(struct drm_device *dev,
>> -                                   const struct of_endpoint *ep)
>> -{
>> -     struct device_node *np;
>> -     void *obj;
>> -
>> -     np = of_graph_get_remote_port_parent(ep->local_node);
>> -
>> -     obj = of_drm_find_panel(np);
>> -     if (!obj)
>> -             obj = of_drm_find_bridge(np);
>> -
>> -     of_node_put(np);
>> -
>> -     return obj ? 0 : -EPROBE_DEFER;
>> -}
>> -
>>  static int atmel_hlcdc_attach_endpoint(struct drm_device *dev,
>> -                                    const struct of_endpoint *ep)
>> +                                    const struct device_node *np)
>>  {
>>       struct atmel_hlcdc_dc *dc = dev->dev_private;
>>       struct atmel_hlcdc_rgb_output *output;
>> -     struct device_node *np;
>>       struct drm_panel *panel;
>>       struct drm_bridge *bridge;
>>       int ret;
>> @@ -195,13 +177,11 @@ static int atmel_hlcdc_attach_endpoint(struct drm_device *dev,
>>
>>       output->encoder.possible_crtcs = 0x1;
>>
>> -     np = of_graph_get_remote_port_parent(ep->local_node);
>> -
>> -     ret = -EPROBE_DEFER;
>> +     ret = drm_of_find_panel_or_bridge(np, 0, 0, &panel, &bridge);
>> +     if (ret)
>> +             return ret;
>>
>> -     panel = of_drm_find_panel(np);
>>       if (panel) {
>> -             of_node_put(np);
>>               output->connector.dpms = DRM_MODE_DPMS_OFF;
>>               output->connector.polled = DRM_CONNECTOR_POLL_CONNECT;
>>               drm_connector_helper_add(&output->connector,
>> @@ -226,9 +206,6 @@ static int atmel_hlcdc_attach_endpoint(struct drm_device *dev,
>>               return 0;
>>       }
>>
>> -     bridge = of_drm_find_bridge(np);
>> -     of_node_put(np);
>> -
>>       if (bridge) {
>>               output->encoder.bridge = bridge;
>>               bridge->encoder = &output->encoder;
>> @@ -245,31 +222,14 @@ static int atmel_hlcdc_attach_endpoint(struct drm_device *dev,
>>
>>  int atmel_hlcdc_create_outputs(struct drm_device *dev)
>>  {
>> -     struct device_node *ep_np = NULL;
>> -     struct of_endpoint ep;
>> +     struct device_node *remote;
>>       int ret;
>>
>> -     for_each_endpoint_of_node(dev->dev->of_node, ep_np) {
>> -             ret = of_graph_parse_endpoint(ep_np, &ep);
>> -             if (!ret)
>> -                     ret = atmel_hlcdc_check_endpoint(dev, &ep);
>> -
>> -             if (ret) {
>> -                     of_node_put(ep_np);
>> -                     return ret;
>> -             }
>> -     }
>> -
>> -     for_each_endpoint_of_node(dev->dev->of_node, ep_np) {
>> -             ret = of_graph_parse_endpoint(ep_np, &ep);
>> -             if (!ret)
>> -                     ret = atmel_hlcdc_attach_endpoint(dev, &ep);
>> -
>> -             if (ret) {
>> -                     of_node_put(ep_np);
>> -                     return ret;
>> -             }
>> -     }
>> +     remote = of_graph_get_remote_node(dev->dev->of_node, 0, 0);
>> +     if (!remote)
>> +             return -ENODEV;
>
> I know you said ports and endpoints should be statically assigned and
> documented in the DT bindings doc, while I agree with the ports part,
> having static endpoints numbering is not possible in some cases.

Okay, I guess it's more that ports are defined. For cases, where you
have a 1 to N connection like this, then yes it's okay.

> Here the port exposed by the Atmel display controller is a raw RGB (or
> parallel RGB) port, and you can connect as many devices as you want to
> this port. For example, on some atmel boards with have 1 bridge ans 1
> panel connected to the same port (but we could have X bridges and Y
> panels and it would work the same way), hence the
> for_each_endpoint_of_node() loop used to connect panels and bridges to
> the controller.
> With your change, my use case no longer works, I can either have the
> panel or the bridge, but not both.
>
> Something like the following would solve the problem:
>
>         endpoint = 0;
>         while (true) {
>                 remote = of_graph_get_remote_node(dev->dev->of_node, 0,
>                                                   endpoint++);
>                 if (!remote)
>                         break;
>
>                 ret = atmel_hlcdc_attach_endpoint(dev, remote);
>                 if (ret)
>                         return ret;
>         }
>
>         if (!endpoint)
>                 return -ENODEV;
>
>         return 0;
>
> If you're not happy with the 'random number of endpoints' thing, can
> you suggest another approach to handle the raw RGB port case (I'm
> pretty sure I'm not the only one to have this use case).

This seems fine to me. The question I have is whether to handle this
loop in the core and whether to have a loop iterator. There's a few
cases of iterating thru all the ports getting remote nodes that I was
thinking about how to handle too.

Rob

Re: [PATCH v2 3/6] drm: of: introduce drm_of_find_panel_or_bridge

[Rob Herring]

On Sun, Feb 12, 2017 at 10:47 PM, Archit Taneja <architt@codeaurora.org> wrote:
>
>
> On 02/10/2017 12:35 AM, Rob Herring wrote:
>>
>> Many drivers have a common pattern of searching the OF graph for either an
>> attached panel or bridge and then finding the DRM struct for the panel
>> or bridge. Also, most drivers need to handle deferred probing when the
>> DRM device is not yet instantiated. Create a common function,
>> drm_of_find_panel_or_bridge, to find the connected node and the
>> associated DRM panel or bridge device.
>>
>> Signed-off-by: Rob Herring <robh@kernel.org>
>> Acked-by: Philipp Zabel <p.zabel@pengutronix.de>
>> ---
>> v2:
>> - Reworked code flow
>> - Added note that at least one of panel or bridge must not be NULL.
>>
>>  drivers/gpu/drm/drm_of.c | 52
>> ++++++++++++++++++++++++++++++++++++++++++++++++
>>  include/drm/drm_of.h     | 13 ++++++++++++
>>  2 files changed, 65 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/drm_of.c b/drivers/gpu/drm/drm_of.c
>> index 47848ed8ca48..86b8b959587a 100644
>> --- a/drivers/gpu/drm/drm_of.c
>> +++ b/drivers/gpu/drm/drm_of.c
>> @@ -3,7 +3,9 @@
>>  #include <linux/list.h>
>>  #include <linux/of_graph.h>
>>  #include <drm/drmP.h>
>> +#include <drm/drm_bridge.h>
>>  #include <drm/drm_crtc.h>
>> +#include <drm/drm_panel.h>
>>  #include <drm/drm_of.h>
>>
>>  static void drm_release_of(struct device *dev, void *data)
>> @@ -207,3 +209,53 @@ int drm_of_encoder_active_endpoint(struct device_node
>> *node,
>>         return -EINVAL;
>>  }
>>  EXPORT_SYMBOL_GPL(drm_of_encoder_active_endpoint);
>> +
>> +/*
>> + * drm_of_find_panel_or_bridge - return connected panel or bridge device
>> + * @np: device tree node containing encoder input ports
>
>
> Should this be 'encoder output ports'? It's the encoder's output port(s)
> that
> contain the endpoint corresponding to the bridge/panel input port.

Yes, indeed.

Rob

Re: [PATCH v2 3/6] drm: of: introduce drm_of_find_panel_or_bridge

[Rob Herring]

On Sun, Feb 12, 2017 at 10:47 PM, Archit Taneja <architt-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org> wrote:
>
>
> On 02/10/2017 12:35 AM, Rob Herring wrote:
>>
>> Many drivers have a common pattern of searching the OF graph for either an
>> attached panel or bridge and then finding the DRM struct for the panel
>> or bridge. Also, most drivers need to handle deferred probing when the
>> DRM device is not yet instantiated. Create a common function,
>> drm_of_find_panel_or_bridge, to find the connected node and the
>> associated DRM panel or bridge device.
>>
>> Signed-off-by: Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
>> Acked-by: Philipp Zabel <p.zabel-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
>> ---
>> v2:
>> - Reworked code flow
>> - Added note that at least one of panel or bridge must not be NULL.
>>
>>  drivers/gpu/drm/drm_of.c | 52
>> ++++++++++++++++++++++++++++++++++++++++++++++++
>>  include/drm/drm_of.h     | 13 ++++++++++++
>>  2 files changed, 65 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/drm_of.c b/drivers/gpu/drm/drm_of.c
>> index 47848ed8ca48..86b8b959587a 100644
>> --- a/drivers/gpu/drm/drm_of.c
>> +++ b/drivers/gpu/drm/drm_of.c
>> @@ -3,7 +3,9 @@
>>  #include <linux/list.h>
>>  #include <linux/of_graph.h>
>>  #include <drm/drmP.h>
>> +#include <drm/drm_bridge.h>
>>  #include <drm/drm_crtc.h>
>> +#include <drm/drm_panel.h>
>>  #include <drm/drm_of.h>
>>
>>  static void drm_release_of(struct device *dev, void *data)
>> @@ -207,3 +209,53 @@ int drm_of_encoder_active_endpoint(struct device_node
>> *node,
>>         return -EINVAL;
>>  }
>>  EXPORT_SYMBOL_GPL(drm_of_encoder_active_endpoint);
>> +
>> +/*
>> + * drm_of_find_panel_or_bridge - return connected panel or bridge device
>> + * @np: device tree node containing encoder input ports
>
>
> Should this be 'encoder output ports'? It's the encoder's output port(s)
> that
> contain the endpoint corresponding to the bridge/panel input port.

Yes, indeed.

Rob
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Re: [PATCH v2 4/6] drm: convert drivers to use of_graph_get_remote_node

[Jyri Sarha]

On 02/09/17 21:05, Rob Herring wrote:
> Convert drivers to use the new of_graph_get_remote_node() helper
> instead of parsing the endpoint node and then getting the remote device
> node. Now drivers can just specify the device node and which
> port/endpoint and get back the connected remote device node. The details
> of the graph binding are nicely abstracted into the core OF graph code.
> 
> This changes some error messages to debug messages (in the graph core).
> Graph connections are often "no connects" depending on the particular
> board, so we want to avoid spurious messages. Plus the kernel is not a
> DT validator.
> 
> Signed-off-by: Rob Herring <robh@kernel.org>
> Acked-by: Neil Armstrong <narmstrong@baylibre.com>
> Acked-by: Philipp Zabel <p.zabel@pengutronix.de>
> Tested-by: Liviu Dudau <liviu.dudau@arm.com>
> Tested-by: Eric Anholt <eric@anholt.net>

For tilcdc part:

Tested-by: Jyri Sarha <jsarha@ti.com>

Cheers,
Jyri

Re: [PATCH v2 4/6] drm: convert drivers to use of_graph_get_remote_node

[Jyri Sarha]

On 02/09/17 21:05, Rob Herring wrote:
> Convert drivers to use the new of_graph_get_remote_node() helper
> instead of parsing the endpoint node and then getting the remote device
> node. Now drivers can just specify the device node and which
> port/endpoint and get back the connected remote device node. The details
> of the graph binding are nicely abstracted into the core OF graph code.
> 
> This changes some error messages to debug messages (in the graph core).
> Graph connections are often "no connects" depending on the particular
> board, so we want to avoid spurious messages. Plus the kernel is not a
> DT validator.
> 
> Signed-off-by: Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
> Acked-by: Neil Armstrong <narmstrong-rdvid1DuHRBWk0Htik3J/w@public.gmane.org>
> Acked-by: Philipp Zabel <p.zabel-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
> Tested-by: Liviu Dudau <liviu.dudau-5wv7dgnIgG8@public.gmane.org>
> Tested-by: Eric Anholt <eric-WhKQ6XTQaPysTnJN9+BGXg@public.gmane.org>

For tilcdc part:

Tested-by: Jyri Sarha <jsarha-l0cyMroinI0@public.gmane.org>

Cheers,
Jyri
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