From: Liviu Dudau <Liviu.Dudau@arm.com> To: David Airlie <airlied@linux.ie>, Daniel Vetter <daniel.vetter@ffwll.ch>, Philipp Zabel <p.zabel@pengutronix.de>, Mark Yao <mark.yao@rock-chips.com>, Heiko Stuebner <heiko@sntech.de>, Russell King <rmk+kernel@arm.linux.org.uk> Cc: dri-devel <dri-devel@lists.freedesktop.org>, linux-rockchip <linux-rockchip@lists.infradead.org>, LAKML <linux-arm-kernel@lists.infradead.org>, LKML <linux-kernel@vger.kernel.org> Subject: [RFC PATCH 1/4] drm: Introduce generic probe function for component based masters. Date: Thu, 15 Oct 2015 17:11:07 +0100 [thread overview] Message-ID: <1444925470-9963-2-git-send-email-Liviu.Dudau@arm.com> (raw) In-Reply-To: <1444925470-9963-1-git-send-email-Liviu.Dudau@arm.com> A lot of component based DRM drivers use a variant of the same code as the probe function. They bind the crtc ports in the first iteration and then scan through the child nodes and bind the encoders attached to the remote endpoints. Factor the common code into a separate function called drm_of_component_probe() in order to increase code reuse. Cc: David Airlie <airlied@linux.ie> Signed-off-by: Liviu Dudau <Liviu.Dudau@arm.com> --- drivers/gpu/drm/drm_of.c | 92 ++++++++++++++++++++++++++++++++++++++++++++++++ include/drm/drm_of.h | 12 +++++++ 2 files changed, 104 insertions(+) diff --git a/drivers/gpu/drm/drm_of.c b/drivers/gpu/drm/drm_of.c index be38840..cf16240 100644 --- a/drivers/gpu/drm/drm_of.c +++ b/drivers/gpu/drm/drm_of.c @@ -1,3 +1,4 @@ +#include <linux/component.h> #include <linux/export.h> #include <linux/list.h> #include <linux/of_graph.h> @@ -61,3 +62,94 @@ uint32_t drm_of_find_possible_crtcs(struct drm_device *dev, return possible_crtcs; } EXPORT_SYMBOL(drm_of_find_possible_crtcs); + +/** + * drm_of_component_probe - Generic probe function for a component based master + * @dev: master device containing the OF node + * @compare_of: compare function used for matching components + * @master_ops: component master ops to be used + * + * Parse the platform device OF node and bind all the components associated + * with the master. Interface ports are added before the encoders in order to + * satisfy their .bind requirements + * See Documentation/devicetree/bindings/graph.txt for the bindings. + * + * Returns zero if successful, or one of the standard error codes if it fails. + */ +int drm_of_component_probe(struct device *dev, + int (*compare_of)(struct device *, void *), + const struct component_master_ops *master_ops) +{ + struct device_node *ep, *port, *remote; + struct component_match *match = NULL; + int i, ret; + + if (!dev->of_node) + return -EINVAL; + + /* + * Bind the crtc's ports first, so that drm_of_find_possible_crtcs() + * called from encoder's .bind callbacks works as expected + */ + for (i = 0; ; i++) { + port = of_parse_phandle(dev->of_node, "ports", i); + if (!port) + break; + + if (!of_device_is_available(port->parent)) { + of_node_put(port); + continue; + } + + component_match_add(dev, &match, compare_of, port); + of_node_put(port); + } + + if (i == 0) { + dev_err(dev, "missing 'ports' property\n"); + return -ENODEV; + } + + if (!match) { + dev_err(dev, "no available port\n"); + return -ENODEV; + } + + /* + * For bound crtcs, bind the encoders attached to their remote endpoint + */ + for (i = 0; ; i++) { + port = of_parse_phandle(dev->of_node, "ports", i); + if (!port) + break; + + if (!of_device_is_available(port->parent)) { + of_node_put(port); + continue; + } + + 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); + continue; + } + + component_match_add(dev, &match, compare_of, remote); + of_node_put(remote); + } + of_node_put(port); + } + + ret = dma_set_coherent_mask(dev, DMA_BIT_MASK(32)); + if (ret) + return ret; + + return component_master_add_with_match(dev, master_ops, match); +} +EXPORT_SYMBOL(drm_of_component_probe); diff --git a/include/drm/drm_of.h b/include/drm/drm_of.h index 2441f71..7c0c05b 100644 --- a/include/drm/drm_of.h +++ b/include/drm/drm_of.h @@ -1,18 +1,30 @@ #ifndef __DRM_OF_H__ #define __DRM_OF_H__ +struct component_master_ops; +struct device; struct drm_device; struct device_node; #ifdef CONFIG_OF extern uint32_t drm_of_find_possible_crtcs(struct drm_device *dev, struct device_node *port); +extern int drm_of_component_probe(struct device *dev, + int (*compare_of)(struct device *, void *), + const struct component_master_ops *master_ops); #else static inline uint32_t drm_of_find_possible_crtcs(struct drm_device *dev, struct device_node *port) { return 0; } + +static inline int drm_of_component_probe(struct device *dev, + int (*compare_of)(struct device *, void *), + const struct component_master_ops *master_ops) +{ + return -EINVAL; +} #endif #endif /* __DRM_OF_H__ */ -- 2.6.0
WARNING: multiple messages have this Message-ID (diff)
From: Liviu.Dudau@arm.com (Liviu Dudau) To: linux-arm-kernel@lists.infradead.org Subject: [RFC PATCH 1/4] drm: Introduce generic probe function for component based masters. Date: Thu, 15 Oct 2015 17:11:07 +0100 [thread overview] Message-ID: <1444925470-9963-2-git-send-email-Liviu.Dudau@arm.com> (raw) In-Reply-To: <1444925470-9963-1-git-send-email-Liviu.Dudau@arm.com> A lot of component based DRM drivers use a variant of the same code as the probe function. They bind the crtc ports in the first iteration and then scan through the child nodes and bind the encoders attached to the remote endpoints. Factor the common code into a separate function called drm_of_component_probe() in order to increase code reuse. Cc: David Airlie <airlied@linux.ie> Signed-off-by: Liviu Dudau <Liviu.Dudau@arm.com> --- drivers/gpu/drm/drm_of.c | 92 ++++++++++++++++++++++++++++++++++++++++++++++++ include/drm/drm_of.h | 12 +++++++ 2 files changed, 104 insertions(+) diff --git a/drivers/gpu/drm/drm_of.c b/drivers/gpu/drm/drm_of.c index be38840..cf16240 100644 --- a/drivers/gpu/drm/drm_of.c +++ b/drivers/gpu/drm/drm_of.c @@ -1,3 +1,4 @@ +#include <linux/component.h> #include <linux/export.h> #include <linux/list.h> #include <linux/of_graph.h> @@ -61,3 +62,94 @@ uint32_t drm_of_find_possible_crtcs(struct drm_device *dev, return possible_crtcs; } EXPORT_SYMBOL(drm_of_find_possible_crtcs); + +/** + * drm_of_component_probe - Generic probe function for a component based master + * @dev: master device containing the OF node + * @compare_of: compare function used for matching components + * @master_ops: component master ops to be used + * + * Parse the platform device OF node and bind all the components associated + * with the master. Interface ports are added before the encoders in order to + * satisfy their .bind requirements + * See Documentation/devicetree/bindings/graph.txt for the bindings. + * + * Returns zero if successful, or one of the standard error codes if it fails. + */ +int drm_of_component_probe(struct device *dev, + int (*compare_of)(struct device *, void *), + const struct component_master_ops *master_ops) +{ + struct device_node *ep, *port, *remote; + struct component_match *match = NULL; + int i, ret; + + if (!dev->of_node) + return -EINVAL; + + /* + * Bind the crtc's ports first, so that drm_of_find_possible_crtcs() + * called from encoder's .bind callbacks works as expected + */ + for (i = 0; ; i++) { + port = of_parse_phandle(dev->of_node, "ports", i); + if (!port) + break; + + if (!of_device_is_available(port->parent)) { + of_node_put(port); + continue; + } + + component_match_add(dev, &match, compare_of, port); + of_node_put(port); + } + + if (i == 0) { + dev_err(dev, "missing 'ports' property\n"); + return -ENODEV; + } + + if (!match) { + dev_err(dev, "no available port\n"); + return -ENODEV; + } + + /* + * For bound crtcs, bind the encoders attached to their remote endpoint + */ + for (i = 0; ; i++) { + port = of_parse_phandle(dev->of_node, "ports", i); + if (!port) + break; + + if (!of_device_is_available(port->parent)) { + of_node_put(port); + continue; + } + + 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); + continue; + } + + component_match_add(dev, &match, compare_of, remote); + of_node_put(remote); + } + of_node_put(port); + } + + ret = dma_set_coherent_mask(dev, DMA_BIT_MASK(32)); + if (ret) + return ret; + + return component_master_add_with_match(dev, master_ops, match); +} +EXPORT_SYMBOL(drm_of_component_probe); diff --git a/include/drm/drm_of.h b/include/drm/drm_of.h index 2441f71..7c0c05b 100644 --- a/include/drm/drm_of.h +++ b/include/drm/drm_of.h @@ -1,18 +1,30 @@ #ifndef __DRM_OF_H__ #define __DRM_OF_H__ +struct component_master_ops; +struct device; struct drm_device; struct device_node; #ifdef CONFIG_OF extern uint32_t drm_of_find_possible_crtcs(struct drm_device *dev, struct device_node *port); +extern int drm_of_component_probe(struct device *dev, + int (*compare_of)(struct device *, void *), + const struct component_master_ops *master_ops); #else static inline uint32_t drm_of_find_possible_crtcs(struct drm_device *dev, struct device_node *port) { return 0; } + +static inline int drm_of_component_probe(struct device *dev, + int (*compare_of)(struct device *, void *), + const struct component_master_ops *master_ops) +{ + return -EINVAL; +} #endif #endif /* __DRM_OF_H__ */ -- 2.6.0
next prev parent reply other threads:[~2015-10-15 16:12 UTC|newest] Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top 2015-10-15 16:11 [RFC PATCH 0/4] drm: Cleanup probe function for component based masters Liviu Dudau 2015-10-15 16:11 ` Liviu Dudau 2015-10-15 16:11 ` Liviu Dudau 2015-10-15 16:11 ` Liviu Dudau [this message] 2015-10-15 16:11 ` [RFC PATCH 1/4] drm: Introduce generic " Liviu Dudau 2015-10-15 16:11 ` [RFC PATCH 2/4] drm/imx: Convert the probe function to the generic drm_of_component_probe() Liviu Dudau 2015-10-15 16:11 ` Liviu Dudau 2015-10-15 16:11 ` Liviu Dudau 2015-10-15 16:11 ` [RFC PATCH 3/4] drm/rockchip: " Liviu Dudau 2015-10-15 16:11 ` Liviu Dudau 2015-10-15 16:11 ` Liviu Dudau 2015-10-15 20:37 ` kbuild test robot 2015-10-15 20:37 ` kbuild test robot 2015-10-15 20:37 ` kbuild test robot 2015-10-15 16:11 ` [RFC PATCH 4/4] drm/armada: " Liviu Dudau 2015-10-15 16:11 ` Liviu Dudau 2015-10-15 16:11 ` Liviu Dudau
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