[RFC v3 0/8] MIPS: CI20: add HDMI out support

[RFC v3 0/8] MIPS: CI20: add HDMI out support

[H. Nikolaus Schaller]

+++ help is needed: driver is not completely working and shows no output signal on the HDMI data and clock lanes
+++ HPD is working and /dev/fb0 does appear
+++ but there is no trigger to initialize the lcdc

* add definition for second jz4780-lcdc
* diverse fixes for yaml schema
* make ingenic-drm driver compatible to ingenic,jz4780-lcd
* converted existing ingenic,lcd.txt to ingenic,lcd.yaml - suggested by Paul Cercueil <paul@crapouillou.net>
* removed blank line before MODULE_DEVICE_TABLE() macro - Paul Cercueil <paul@crapouillou.net>
* added some missing Signed-off:
* removed Zubair Lutfullah Kakakhel <Zubair.Kakakhel@imgtec.com> from the
  recipients list and Cc: since the address is no longer available.
* removed "pinctrl: ingenic: add hdmi-ddc pin control group" from this patch
  series since it is already applied elsewhere (by Linus Walleij <linus.walleij@linaro.org>)

RFC V2 2020-02-28 19:19:40:
* Converted .txt bindings to .yaml (by Sam Ravnborg <sam@ravnborg.org> - big THANKS)

RFC V1 2020-02-26 20:13:06:
This patch series adds HDMI output to the jz4780/CI20 board.

It is based on taking the old 3.18 vendor kernel as well as
an earlier submission from 2015:
https://lore.kernel.org/patchwork/patch/547872/
and trying to achieve the same with modern DTS setup and new/modified
drivers.

Unfortunately, in this first RFC, only EDID and creation of
/dev/fb0 are working. Also, HDMI hot plugging is detected.

But there is no HDMI output signal. So some tiny piece seems
to be missing to enable/configure the Synposys HDMI controller.

We need help from the community to fix this.

Original authors of most patches are
* Paul Boddie <paul@boddie.org.uk>
* Zubair Lutfullah Kakakhel <Zubair.Kakakhel@imgtec.com>


H. Nikolaus Schaller (4):
  dt-bindings: display: convert ingenic,lcd.txt to ingenic,lcd.yaml
  drm: ingenic-drm: add MODULE_DEVICE_TABLE
  drm: ingenic-drm: add support for ingenic,jz4780-lcd
  MIPS: CI20: defconfig: configure for DRM_DW_HDMI_JZ4780

Paul Boddie (3):
  drm: ingenic: add jz4780 Synopsys HDMI driver
  MIPS: DTS: jz4780: account for Synopsys HDMI driver and LCD controller
  MIPS: DTS: CI20: add HDMI setup

Sam Ravnborg (1):
  dt-bindings: display: add ingenic-jz4780-hdmi DT Schema

 .../bindings/display/ingenic,lcd.txt          |  45 ------
 .../bindings/display/ingenic,lcd.yaml         | 128 ++++++++++++++++++
 .../bindings/display/ingenic-jz4780-hdmi.yaml |  82 +++++++++++
 arch/mips/boot/dts/ingenic/ci20.dts           |  64 +++++++++
 arch/mips/boot/dts/ingenic/jz4780.dtsi        |  46 +++++++
 arch/mips/configs/ci20_defconfig              |   3 +
 drivers/gpu/drm/ingenic/Kconfig               |   8 ++
 drivers/gpu/drm/ingenic/Makefile              |   1 +
 drivers/gpu/drm/ingenic/dw_hdmi-jz4780.c      | 120 ++++++++++++++++
 drivers/gpu/drm/ingenic/ingenic-drm.c         |   8 ++
 10 files changed, 460 insertions(+), 45 deletions(-)
 delete mode 100644 Documentation/devicetree/bindings/display/ingenic,lcd.txt
 create mode 100644 Documentation/devicetree/bindings/display/ingenic,lcd.yaml
 create mode 100644 Documentation/devicetree/bindings/display/ingenic-jz4780-hdmi.yaml
 create mode 100644 drivers/gpu/drm/ingenic/dw_hdmi-jz4780.c

-- 
2.25.1

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[RFC v3 1/8] dt-bindings: display: convert ingenic, lcd.txt to ingenic, lcd.yaml

[H. Nikolaus Schaller]

and add compatible: jz4780-lcd, including an example how to
configure both lcd controllers.

Also fix the clock names and examples.

Based on work by Paul Cercueil <paul@crapouillou.net> and
Sam Ravnborg <sam@ravnborg.org>

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
Cc: Rob Herring <robh@kernel.org>
Cc: devicetree@vger.kernel.org
---
 .../bindings/display/ingenic,lcd.txt          |  45 ------
 .../bindings/display/ingenic,lcd.yaml         | 128 ++++++++++++++++++
 2 files changed, 128 insertions(+), 45 deletions(-)
 delete mode 100644 Documentation/devicetree/bindings/display/ingenic,lcd.txt
 create mode 100644 Documentation/devicetree/bindings/display/ingenic,lcd.yaml

diff --git a/Documentation/devicetree/bindings/display/ingenic,lcd.txt b/Documentation/devicetree/bindings/display/ingenic,lcd.txt
deleted file mode 100644
index 01e3261defb6..000000000000
--- a/Documentation/devicetree/bindings/display/ingenic,lcd.txt
+++ /dev/null
@@ -1,45 +0,0 @@
-Ingenic JZ47xx LCD driver
-
-Required properties:
-- compatible: one of:
-  * ingenic,jz4740-lcd
-  * ingenic,jz4725b-lcd
-  * ingenic,jz4770-lcd
-- reg: LCD registers location and length
-- clocks: LCD pixclock and device clock specifiers.
-	   The device clock is only required on the JZ4740.
-- clock-names: "lcd_pclk" and "lcd"
-- interrupts: Specifies the interrupt line the LCD controller is connected to.
-
-Example:
-
-panel {
-	compatible = "sharp,ls020b1dd01d";
-
-	backlight = <&backlight>;
-	power-supply = <&vcc>;
-
-	port {
-		panel_input: endpoint {
-			remote-endpoint = <&panel_output>;
-		};
-	};
-};
-
-
-lcd: lcd-controller@13050000 {
-	compatible = "ingenic,jz4725b-lcd";
-	reg = <0x13050000 0x1000>;
-
-	interrupt-parent = <&intc>;
-	interrupts = <31>;
-
-	clocks = <&cgu JZ4725B_CLK_LCD>;
-	clock-names = "lcd";
-
-	port {
-		panel_output: endpoint {
-			remote-endpoint = <&panel_input>;
-		};
-	};
-};
diff --git a/Documentation/devicetree/bindings/display/ingenic,lcd.yaml b/Documentation/devicetree/bindings/display/ingenic,lcd.yaml
new file mode 100644
index 000000000000..8b6467cfc191
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/ingenic,lcd.yaml
@@ -0,0 +1,128 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/ingenic,lcd.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Bindings for Ingenic JZ4780 LCD Controller
+
+maintainers:
+  - Paul Cercueil <paul@crapouillou.net>
+
+description: |
+  LCD Controller is the Display Controller for the Ingenic JZ47xx SoC
+
+properties:
+  compatible:
+    oneOf:
+     - const: ingenic,jz4725b-lcd
+     - const: ingenic,jz4740-lcd
+     - const: ingenic,jz4770-lcd
+     - const: ingenic,jz4780-lcd
+
+  reg:
+    maxItems: 1
+    description: LCD registers location and length
+
+  interrupts:
+    maxItems: 1
+    description: Specifies the interrupt provided by parent
+
+  clocks:
+    maxItems: 2
+    description: Clock specifiers for LCD pixclock and device clock.
+      The device clock is only required on the JZ4740 and JZ4780
+
+  clock-names:
+    items:
+      - const: lcd
+      - const: lcd_pclk
+
+  port:
+    type: object
+    description: |
+      A port node with endpoint definitions as defined in
+      Documentation/devicetree/bindings/media/video-interfaces.txt
+
+required:
+    - compatible
+    - reg
+    - interrupts
+    - clocks
+    - clock-names
+    - port
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/jz4725b-cgu.h>
+
+    panel {
+      compatible = "sharp,ls020b1dd01d";
+
+      backlight = <&backlight>;
+      power-supply = <&vcc>;
+
+      port {
+        panel_input: endpoint {
+          remote-endpoint = <&panel_output>;
+          };
+        };
+      };
+
+    lcd: lcd-controller@13050000 {
+      compatible = "ingenic,jz4725b-lcd";
+      reg = <0x13050000 0x1000>;
+
+      interrupt-parent = <&intc>;
+      interrupts = <31>;
+
+      clocks = <&cgu JZ4725B_CLK_LCD>;
+      clock-names = "lcd", "lcd_pclk";
+
+      port {
+        panel_output: endpoint {
+          remote-endpoint = <&panel_input>;
+          };
+        };
+      };
+
+  - |
+    #include <dt-bindings/clock/jz4780-cgu.h>
+
+    lcdc0: lcdc0@13050000 {
+        compatible = "ingenic,jz4780-lcd";
+        reg = <0x13050000 0x1800>;
+
+        clocks = <&cgu JZ4780_CLK_TVE>, <&cgu JZ4780_CLK_LCD0PIXCLK>;
+        clock-names = "lcd", "lcd_pclk";
+
+        interrupt-parent = <&intc>;
+        interrupts = <31>;
+
+        jz4780_lcd_out: port {
+            #address-cells = <1>;
+            #size-cells = <0>;
+
+            jz4780_out_hdmi: endpoint@0 {
+                reg = <0>;
+                remote-endpoint = <&hdmi_in_lcd>;
+            };
+        };
+    };
+
+    lcdc1: lcdc1@130a0000 {
+        compatible = "ingenic,jz4780-lcd";
+        reg = <0x130a0000 0x1800>;
+
+        clocks = <&cgu JZ4780_CLK_TVE>, <&cgu JZ4780_CLK_LCD1PIXCLK>;
+        clock-names = "lcd", "lcd_pclk";
+
+        interrupt-parent = <&intc>;
+        interrupts = <31>;
+
+        status = "disabled";
+    };
+
+...
-- 
2.25.1

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[RFC v3 2/8] drm: ingenic-drm: add MODULE_DEVICE_TABLE

[H. Nikolaus Schaller]

so that the driver can load by matching the device tree
if compiled as module.

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
---
 drivers/gpu/drm/ingenic/ingenic-drm.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/ingenic/ingenic-drm.c b/drivers/gpu/drm/ingenic/ingenic-drm.c
index 6d47ef7b148c..bcba2f024842 100644
--- a/drivers/gpu/drm/ingenic/ingenic-drm.c
+++ b/drivers/gpu/drm/ingenic/ingenic-drm.c
@@ -843,6 +843,7 @@ static const struct of_device_id ingenic_drm_of_match[] = {
 	{ .compatible = "ingenic,jz4770-lcd", .data = &jz4770_soc_info },
 	{ /* sentinel */ },
 };
+MODULE_DEVICE_TABLE(of, ingenic_drm_of_match);
 
 static struct platform_driver ingenic_drm_driver = {
 	.driver = {
-- 
2.25.1

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[RFC v3 3/8] drm: ingenic-drm: add support for ingenic,jz4780-lcd

[H. Nikolaus Schaller]

This adds jz_soc_info and a compatible string for the jz4780
lcd controller.

Note that the jz4780 lcdc is a superset of the jz4740 lcdc
and the additional functions are not used if they stay
uninitialized.

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
---
 drivers/gpu/drm/ingenic/ingenic-drm.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/ingenic/ingenic-drm.c b/drivers/gpu/drm/ingenic/ingenic-drm.c
index bcba2f024842..82c28ef1ac02 100644
--- a/drivers/gpu/drm/ingenic/ingenic-drm.c
+++ b/drivers/gpu/drm/ingenic/ingenic-drm.c
@@ -837,10 +837,17 @@ static const struct jz_soc_info jz4770_soc_info = {
 	.max_height = 720,
 };
 
+static const struct jz_soc_info jz4780_soc_info = {
+	.needs_dev_clk = true,
+	.max_width = 4096,
+	.max_height = 2048,
+};
+
 static const struct of_device_id ingenic_drm_of_match[] = {
 	{ .compatible = "ingenic,jz4740-lcd", .data = &jz4740_soc_info },
 	{ .compatible = "ingenic,jz4725b-lcd", .data = &jz4725b_soc_info },
 	{ .compatible = "ingenic,jz4770-lcd", .data = &jz4770_soc_info },
+	{ .compatible = "ingenic,jz4780-lcd", .data = &jz4780_soc_info },
 	{ /* sentinel */ },
 };
 MODULE_DEVICE_TABLE(of, ingenic_drm_of_match);
-- 
2.25.1

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[RFC v3 4/8] dt-bindings: display: add ingenic-jz4780-hdmi DT Schema

[H. Nikolaus Schaller]

From: Sam Ravnborg <sam@ravnborg.org>

Add DT bindings for the hdmi driver for the Ingenic JZ4780 SoC.
Based on .txt binding from Zubair Lutfullah Kakakhel

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
Cc: Rob Herring <robh@kernel.org>
Cc: devicetree@vger.kernel.org
---
 .../bindings/display/ingenic-jz4780-hdmi.yaml | 82 +++++++++++++++++++
 1 file changed, 82 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/ingenic-jz4780-hdmi.yaml

diff --git a/Documentation/devicetree/bindings/display/ingenic-jz4780-hdmi.yaml b/Documentation/devicetree/bindings/display/ingenic-jz4780-hdmi.yaml
new file mode 100644
index 000000000000..a545ff8704eb
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/ingenic-jz4780-hdmi.yaml
@@ -0,0 +1,82 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/ingenic-jz4780-hdmi.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Bindings for Ingenic JZ4780 HDMI Transmitter
+
+maintainers:
+  - H. Nikolaus Schaller <hns@goldelico.com>
+
+description: |
+  The HDMI Transmitter in the Ingenic JZ4780 is a Synopsys DesignWare HDMI 1.4
+  TX controller IP with accompanying PHY IP.
+
+allOf:
+  - $ref: panel/panel-common.yaml#
+
+properties:
+  compatible:
+    items:
+      - const: ingenic,jz4780-hdmi
+
+  reg:
+    maxItems: 1
+    description: the address & size of the LCD controller registers
+
+  reg-io-width:
+    const: 4
+
+  interrupts:
+    maxItems: 1
+    description: Specifies the interrupt provided by parent
+
+  clocks:
+    maxItems: 2
+    description: Clock specifiers for isrf and iahb clocks
+
+  clock-names:
+    items:
+      - const: isfr
+      - const: iahb
+
+  ddc-i2c-bus: true
+  ports: true
+
+required:
+    - compatible
+    - clocks
+    - clock-names
+    - ports
+    - reg-io-width
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/jz4780-cgu.h>
+
+    hdmi: hdmi@10180000 {
+        compatible = "ingenic,jz4780-hdmi";
+        reg = <0x10180000 0x8000>;
+        reg-io-width = <4>;
+        ddc-i2c-bus = <&i2c4>;
+        interrupt-parent = <&intc>;
+        interrupts = <3>;
+        clocks = <&cgu JZ4780_CLK_HDMI>, <&cgu JZ4780_CLK_AHB0>;
+        clock-names = "isfr", "iahb";
+
+        ports {
+            hdmi_in: port {
+                #address-cells = <1>;
+                #size-cells = <0>;
+                hdmi_in_lcd: endpoint@0 {
+                    reg = <0>;
+                    remote-endpoint = <&jz4780_out_hdmi>;
+                };
+            };
+        };
+    };
+
+...
-- 
2.25.1

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[RFC v3 5/8] drm: ingenic: add jz4780 Synopsys HDMI driver

[H. Nikolaus Schaller]

From: Paul Boddie <paul@boddie.org.uk>

A specialisation of the generic Synopsys HDMI driver is employed for JZ4780
HDMI support. This requires a new driver, plus device tree and configuration
modifications.

Signed-off-by: Paul Boddie <paul@boddie.org.uk>
Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
---
 drivers/gpu/drm/ingenic/Kconfig          |   8 ++
 drivers/gpu/drm/ingenic/Makefile         |   1 +
 drivers/gpu/drm/ingenic/dw_hdmi-jz4780.c | 120 +++++++++++++++++++++++
 3 files changed, 129 insertions(+)
 create mode 100644 drivers/gpu/drm/ingenic/dw_hdmi-jz4780.c

diff --git a/drivers/gpu/drm/ingenic/Kconfig b/drivers/gpu/drm/ingenic/Kconfig
index d82c3d37ec9c..44bfd0d35af1 100644
--- a/drivers/gpu/drm/ingenic/Kconfig
+++ b/drivers/gpu/drm/ingenic/Kconfig
@@ -14,3 +14,11 @@ config DRM_INGENIC
 	  Choose this option for DRM support for the Ingenic SoCs.
 
 	  If M is selected the module will be called ingenic-drm.
+
+config DRM_DW_HDMI_JZ4780
+	tristate "HDMI Support for Ingenic JZ4780"
+	depends on DRM_INGENIC
+	depends on OF
+	select DRM_DW_HDMI
+	help
+	  Choose this option for HDMI output from the Ingenic JZ4780.
diff --git a/drivers/gpu/drm/ingenic/Makefile b/drivers/gpu/drm/ingenic/Makefile
index 11cac42ce0bb..238383de63c7 100644
--- a/drivers/gpu/drm/ingenic/Makefile
+++ b/drivers/gpu/drm/ingenic/Makefile
@@ -1 +1,2 @@
 obj-$(CONFIG_DRM_INGENIC) += ingenic-drm.o
+obj-$(CONFIG_DRM_DW_HDMI_JZ4780) += dw_hdmi-jz4780.o
diff --git a/drivers/gpu/drm/ingenic/dw_hdmi-jz4780.c b/drivers/gpu/drm/ingenic/dw_hdmi-jz4780.c
new file mode 100644
index 000000000000..fa379e337263
--- /dev/null
+++ b/drivers/gpu/drm/ingenic/dw_hdmi-jz4780.c
@@ -0,0 +1,120 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (C) 2011-2013 Freescale Semiconductor, Inc.
+ * Copyright (C) 2019 Paul Boddie <paul@boddie.org.uk>
+ *
+ * Derived from dw_hdmi-imx.c with i.MX portions removed.
+ * Probe and remove operations derived from rcar_dw_hdmi.c.
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#include <drm/bridge/dw_hdmi.h>
+#include <drm/drm_of.h>
+
+static const struct dw_hdmi_mpll_config jz4780_mpll_cfg[] = {
+	{ 45250000,  { { 0x01e0, 0x0000 },
+		       { 0x21e1, 0x0000 },
+		       { 0x41e2, 0x0000 } } },
+	{ 92500000,  { { 0x0140, 0x0005 },
+		       { 0x2141, 0x0005 },
+		       { 0x4142, 0x0005 } } },
+	{ 148500000, { { 0x00a0, 0x000a },
+		       { 0x20a1, 0x000a },
+		       { 0x40a2, 0x000a } } },
+	{ 216000000, { { 0x00a0, 0x000a },
+		       { 0x2001, 0x000f },
+		       { 0x4002, 0x000f } } },
+	{ ~0UL,      { { 0x0000, 0x0000 },
+		       { 0x0000, 0x0000 },
+		       { 0x0000, 0x0000 } } }
+};
+
+static const struct dw_hdmi_curr_ctrl jz4780_cur_ctr[] = {
+	/*pixelclk     bpp8    bpp10   bpp12 */
+	{ 54000000,  { 0x091c, 0x091c, 0x06dc } },
+	{ 58400000,  { 0x091c, 0x06dc, 0x06dc } },
+	{ 72000000,  { 0x06dc, 0x06dc, 0x091c } },
+	{ 74250000,  { 0x06dc, 0x0b5c, 0x091c } },
+	{ 118800000, { 0x091c, 0x091c, 0x06dc } },
+	{ 216000000, { 0x06dc, 0x0b5c, 0x091c } },
+	{ ~0UL,      { 0x0000, 0x0000, 0x0000 } },
+};
+
+/*
+ * Resistance term 133Ohm Cfg
+ * PREEMP config 0.00
+ * TX/CK level 10
+ */
+static const struct dw_hdmi_phy_config jz4780_phy_config[] = {
+	/*pixelclk   symbol   term   vlev */
+	{ 216000000, 0x800d, 0x0005, 0x01ad},
+	{ ~0UL,      0x0000, 0x0000, 0x0000}
+};
+
+static enum drm_mode_status
+jz4780_hdmi_mode_valid(struct drm_connector *con,
+		       const struct drm_display_mode *mode)
+{
+	if (mode->clock < 13500)
+		return MODE_CLOCK_LOW;
+	/* FIXME: Hardware is capable of 270MHz, but setup data is missing. */
+	if (mode->clock > 216000)
+		return MODE_CLOCK_HIGH;
+
+	return MODE_OK;
+}
+
+static struct dw_hdmi_plat_data jz4780_dw_hdmi_plat_data = {
+	.mpll_cfg   = jz4780_mpll_cfg,
+	.cur_ctr    = jz4780_cur_ctr,
+	.phy_config = jz4780_phy_config,
+	.mode_valid = jz4780_hdmi_mode_valid,
+};
+
+static const struct of_device_id jz4780_dw_hdmi_dt_ids[] = {
+	{ .compatible = "ingenic,jz4780-dw-hdmi" },
+	{ /* Sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, jz4780_dw_hdmi_dt_ids);
+
+static int jz4780_dw_hdmi_probe(struct platform_device *pdev)
+{
+	struct dw_hdmi *hdmi;
+
+	hdmi = dw_hdmi_probe(pdev, &jz4780_dw_hdmi_plat_data);
+	if (IS_ERR(hdmi))
+		return PTR_ERR(hdmi);
+
+	platform_set_drvdata(pdev, hdmi);
+
+	return 0;
+}
+
+static int jz4780_dw_hdmi_remove(struct platform_device *pdev)
+{
+	struct dw_hdmi *hdmi = platform_get_drvdata(pdev);
+
+	dw_hdmi_remove(hdmi);
+
+	return 0;
+}
+
+static struct platform_driver jz4780_dw_hdmi_platform_driver = {
+	.probe  = jz4780_dw_hdmi_probe,
+	.remove = jz4780_dw_hdmi_remove,
+	.driver = {
+		.name = "dw-hdmi-jz4780",
+		.of_match_table = jz4780_dw_hdmi_dt_ids,
+	},
+};
+
+module_platform_driver(jz4780_dw_hdmi_platform_driver);
+
+MODULE_AUTHOR("Andy Yan <andy.yan@rock-chips.com>");
+MODULE_AUTHOR("Yakir Yang <ykk@rock-chips.com>");
+MODULE_AUTHOR("Paul Boddie <paul@boddie.org.uk>");
+MODULE_DESCRIPTION("Ingenic JZ4780 DW-HDMI Driver Extension");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:dw-hdmi-jz4780");
-- 
2.25.1

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[RFC v3 6/8] MIPS: DTS: jz4780: account for Synopsys HDMI driver and LCD controller

[H. Nikolaus Schaller]

From: Paul Boddie <paul@boddie.org.uk>

A specialisation of the generic Synopsys HDMI driver is employed for JZ4780
HDMI support. This requires a new driver, plus device tree and configuration
modifications.

Signed-off-by: Paul Boddie <paul@boddie.org.uk>
Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
---
 arch/mips/boot/dts/ingenic/jz4780.dtsi | 46 ++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)

diff --git a/arch/mips/boot/dts/ingenic/jz4780.dtsi b/arch/mips/boot/dts/ingenic/jz4780.dtsi
index bb89653d16a3..73776514bbe5 100644
--- a/arch/mips/boot/dts/ingenic/jz4780.dtsi
+++ b/arch/mips/boot/dts/ingenic/jz4780.dtsi
@@ -434,4 +434,50 @@ bch: bch@134d0000 {
 
 		status = "disabled";
 	};
+
+	hdmi: hdmi@10180000 {
+		compatible = "ingenic,jz4780-dw-hdmi";
+		reg = <0x10180000 0x8000>;
+		reg-io-width = <4>;
+
+		clocks = <&cgu JZ4780_CLK_HDMI>, <&cgu JZ4780_CLK_AHB0>;
+		clock-names = "isfr" , "iahb";
+
+		assigned-clocks = <&cgu JZ4780_CLK_HDMI>;
+		assigned-clock-rates = <27000000>;
+
+		interrupt-parent = <&intc>;
+		interrupts = <3>;
+
+		/* ddc-i2c-bus = <&i2c4>; */
+
+		status = "disabled";
+	};
+
+	lcdc0: lcdc0@13050000 {
+		compatible = "ingenic,jz4780-lcd";
+		reg = <0x13050000 0x1800>;
+
+		clocks = <&cgu JZ4780_CLK_TVE>, <&cgu JZ4780_CLK_LCD0PIXCLK>;
+		clock-names = "lcd", "lcd_pclk";
+
+		interrupt-parent = <&intc>;
+		interrupts = <31>;
+
+		status = "disabled";
+	};
+
+	lcdc1: lcdc1@130a0000 {
+		compatible = "ingenic,jz4780-lcd";
+		reg = <0x130a0000 0x1800>;
+
+		clocks = <&cgu JZ4780_CLK_TVE>, <&cgu JZ4780_CLK_LCD1PIXCLK>;
+		clock-names = "lcd", "lcd_pclk";
+
+		interrupt-parent = <&intc>;
+		interrupts = <31>;
+
+		status = "disabled";
+	};
+
 };
-- 
2.25.1

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[RFC v3 7/8] MIPS: DTS: CI20: add HDMI setup

[H. Nikolaus Schaller]

From: Paul Boddie <paul@boddie.org.uk>

We need to hook up
* HDMI power regulator
* HDMI connector
* DDC pinmux
* HDMI and LCD endpoint connections

Signed-off-by: Paul Boddie <paul@boddie.org.uk>
Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
---
 arch/mips/boot/dts/ingenic/ci20.dts | 64 +++++++++++++++++++++++++++++
 1 file changed, 64 insertions(+)

diff --git a/arch/mips/boot/dts/ingenic/ci20.dts b/arch/mips/boot/dts/ingenic/ci20.dts
index c340f947baa0..97e09382ebd7 100644
--- a/arch/mips/boot/dts/ingenic/ci20.dts
+++ b/arch/mips/boot/dts/ingenic/ci20.dts
@@ -62,6 +62,28 @@ eth0_power: fixedregulator@0 {
 		enable-active-high;
 	};
 
+	hdmi_power: fixedregulator@2 {
+		compatible = "regulator-fixed";
+		regulator-name = "hdmi_power";
+		regulator-min-microvolt = <5000000>;
+		regulator-max-microvolt = <5000000>;
+		gpio = <&gpa 25 GPIO_ACTIVE_LOW>;
+		enable-active-high;
+		regulator-always-on;
+	};
+
+	hdmi_out: connector {
+		compatible = "hdmi-connector";
+		label = "HDMI OUT";
+		type = "a";
+
+		port {
+			hdmi_con: endpoint {
+				remote-endpoint = <&dw_hdmi_out>;
+			};
+		};
+	};
+
 	wlan0_power: fixedregulator@1 {
 		compatible = "regulator-fixed";
 		regulator-name = "wlan0_power";
@@ -435,6 +457,12 @@ pins_i2c4: i2c4 {
 		bias-disable;
 	};
 
+	pins_hdmi_ddc: hdmi_ddc {
+		function = "hdmi-ddc";
+		groups = "hdmi-ddc";
+		bias-disable;
+	};
+
 	pins_nemc: nemc {
 		function = "nemc";
 		groups = "nemc-data", "nemc-cle-ale", "nemc-rd-we", "nemc-frd-fwe";
@@ -471,3 +499,39 @@ &tcu {
 	assigned-clocks = <&tcu TCU_CLK_TIMER0>, <&tcu TCU_CLK_TIMER1>;
 	assigned-clock-rates = <3000000>, <3000000>;
 };
+
+&hdmi {
+	status = "okay";
+
+	pinctrl-names = "default";
+	pinctrl-0 = <&pins_hdmi_ddc>;
+
+	ports {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		port@0 {
+			reg = <0>;
+			dw_hdmi_in: endpoint {
+				remote-endpoint = <&lcd_out>;
+			};
+		};
+
+		port@1 {
+			reg = <1>;
+			dw_hdmi_out: endpoint {
+				remote-endpoint = <&hdmi_con>;
+			};
+		};
+	};
+};
+
+&lcdc0 {
+	status = "okay";
+
+	port {
+		lcd_out: endpoint {
+			remote-endpoint = <&dw_hdmi_in>;
+		};
+	};
+};
-- 
2.25.1

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[RFC v3 8/8] MIPS: CI20: defconfig: configure for DRM_DW_HDMI_JZ4780

[H. Nikolaus Schaller]

We configure them as loadable modules by default.

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
---
 arch/mips/configs/ci20_defconfig | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/mips/configs/ci20_defconfig b/arch/mips/configs/ci20_defconfig
index be41df2a81fb..3f733a555cb2 100644
--- a/arch/mips/configs/ci20_defconfig
+++ b/arch/mips/configs/ci20_defconfig
@@ -103,6 +103,9 @@ CONFIG_RTC_CLASS=y
 CONFIG_RTC_DRV_JZ4740=y
 CONFIG_DMADEVICES=y
 CONFIG_DMA_JZ4780=y
+CONFIG_DRM=m
+CONFIG_DRM_DW_HDMI_JZ4780=m
+CONFIG_DRM_DW_HDMI=m
 # CONFIG_IOMMU_SUPPORT is not set
 CONFIG_MEMORY=y
 CONFIG_EXT4_FS=y
-- 
2.25.1

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Re: [RFC v3 1/8] dt-bindings: display: convert ingenic,lcd.txt to ingenic,lcd.yaml

[Rob Herring]

On Sun, 29 Mar 2020 19:35:47 +0200, "H. Nikolaus Schaller" wrote:
> and add compatible: jz4780-lcd, including an example how to
> configure both lcd controllers.
> 
> Also fix the clock names and examples.
> 
> Based on work by Paul Cercueil <paul@crapouillou.net> and
> Sam Ravnborg <sam@ravnborg.org>
> 
> Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
> Cc: Rob Herring <robh@kernel.org>
> Cc: devicetree@vger.kernel.org
> ---
>  .../bindings/display/ingenic,lcd.txt          |  45 ------
>  .../bindings/display/ingenic,lcd.yaml         | 128 ++++++++++++++++++
>  2 files changed, 128 insertions(+), 45 deletions(-)
>  delete mode 100644 Documentation/devicetree/bindings/display/ingenic,lcd.txt
>  create mode 100644 Documentation/devicetree/bindings/display/ingenic,lcd.yaml
> 

My bot found errors running 'make dt_binding_check' on your patch:

/builds/robherring/linux-dt-review/Documentation/devicetree/bindings/display/ingenic,lcd.example.dt.yaml: lcd-controller@13050000: clocks: [[4294967295, 9]] is too short

See https://patchwork.ozlabs.org/patch/1263508

If you already ran 'make dt_binding_check' and didn't see the above
error(s), then make sure dt-schema is up to date:

pip3 install git+https://github.com/devicetree-org/dt-schema.git@master --upgrade

Please check and re-submit.
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Re: [RFC v3 1/8] dt-bindings: display: convert ingenic, lcd.txt to ingenic, lcd.yaml

[H. Nikolaus Schaller]

Hi Paul,

> Am 30.03.2020 um 17:42 schrieb Rob Herring <robh@kernel.org>:
> 
> On Sun, 29 Mar 2020 19:35:47 +0200, "H. Nikolaus Schaller" wrote:
>> and add compatible: jz4780-lcd, including an example how to
>> configure both lcd controllers.
>> 
>> Also fix the clock names and examples.
>> 
>> Based on work by Paul Cercueil <paul@crapouillou.net> and
>> Sam Ravnborg <sam@ravnborg.org>
>> 
>> Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
>> Cc: Rob Herring <robh@kernel.org>
>> Cc: devicetree@vger.kernel.org
>> ---
>> .../bindings/display/ingenic,lcd.txt          |  45 ------
>> .../bindings/display/ingenic,lcd.yaml         | 128 ++++++++++++++++++
>> 2 files changed, 128 insertions(+), 45 deletions(-)
>> delete mode 100644 Documentation/devicetree/bindings/display/ingenic,lcd.txt
>> create mode 100644 Documentation/devicetree/bindings/display/ingenic,lcd.yaml
>> 
> 
> My bot found errors running 'make dt_binding_check' on your patch:
> 
> /builds/robherring/linux-dt-review/Documentation/devicetree/bindings/display/ingenic,lcd.example.dt.yaml: lcd-controller@13050000: clocks: [[4294967295, 9]] is too short
> 
> See https://patchwork.ozlabs.org/patch/1263508

If I read the message correctly, I think there should be 2 clocks specified in
the jz4725b-lcd example and not just

	clocks = <&cgu JZ4725B_CLK_LCD>;

Unfortunately the jz4725b.dtsi does not seem to be upstream or in linux-next so
I don't know if it works without lcd_pclk or not.

If there is really just one clock, we need to modify the clocks and clock-names
schema and add minItems: 1 and maxItems: 2 to allow for this flexibility.

Otherwise we have to fix the example. Do you have some git with an up-to-date
jz4725b.dtsi to look at?

> 
> If you already ran 'make dt_binding_check' and didn't see the above
> error(s), then make sure dt-schema is up to date:
> 
> pip3 install git+https://github.com/devicetree-org/dt-schema.git@master --upgrade

+++ :)

> 
> Please check and re-submit.

Sure, since it is a RFC.

BR and thanks,
Nikolaus

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Re: [RFC v3 4/8] dt-bindings: display: add ingenic-jz4780-hdmi DT Schema

[Sam Ravnborg]

Hi Nikolaus.

On Sun, Mar 29, 2020 at 07:35:50PM +0200, H. Nikolaus Schaller wrote:
> From: Sam Ravnborg <sam@ravnborg.org>
> 
> Add DT bindings for the hdmi driver for the Ingenic JZ4780 SoC.
> Based on .txt binding from Zubair Lutfullah Kakakhel
> 
> Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
> Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
> Cc: Rob Herring <robh@kernel.org>
> Cc: devicetree@vger.kernel.org

There is a few mistakes that originate from my original patch - sorry.

> ---
>  .../bindings/display/ingenic-jz4780-hdmi.yaml | 82 +++++++++++++++++++
>  1 file changed, 82 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/ingenic-jz4780-hdmi.yaml
> 
> diff --git a/Documentation/devicetree/bindings/display/ingenic-jz4780-hdmi.yaml b/Documentation/devicetree/bindings/display/ingenic-jz4780-hdmi.yaml
> new file mode 100644
> index 000000000000..a545ff8704eb
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/ingenic-jz4780-hdmi.yaml
> @@ -0,0 +1,82 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/display/ingenic-jz4780-hdmi.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Bindings for Ingenic JZ4780 HDMI Transmitter
> +
> +maintainers:
> +  - H. Nikolaus Schaller <hns@goldelico.com>
> +
> +description: |
> +  The HDMI Transmitter in the Ingenic JZ4780 is a Synopsys DesignWare HDMI 1.4
> +  TX controller IP with accompanying PHY IP.
> +
> +allOf:
> +  - $ref: panel/panel-common.yaml#
panel-common is only supposed to be used by panels.
There is a few users in display/ but this is bindings that are
candidates to be moved to panel/ - and this binding describes a
display controller and not a panel.

> +
> +properties:
> +  compatible:
> +    items:
> +      - const: ingenic,jz4780-hdmi
> +
> +  reg:
> +    maxItems: 1
> +    description: the address & size of the LCD controller registers
> +
> +  reg-io-width:
> +    const: 4
> +
> +  interrupts:
> +    maxItems: 1
> +    description: Specifies the interrupt provided by parent
> +
> +  clocks:
> +    maxItems: 2
> +    description: Clock specifiers for isrf and iahb clocks
> +
> +  clock-names:
> +    items:
> +      - const: isfr
> +      - const: iahb
> +
> +  ddc-i2c-bus: true
> +  ports: true
As we no longer rely on panel-common this needs to be fully specified -
for example like this:

  ddc-i2c-bus:
    $ref: /schemas/types.yaml#/definitions/phandle
    description: phandle to the I2C bus that is connected to DDC

  ports:
    type: object
    description: |
      A ports node with endpoint definitions as defined in
      Documentation/devicetree/bindings/media/video-interfaces.txt.


Thanks for taking care of this binding.

	Sam


> +
> +required:
> +    - compatible
> +    - clocks
> +    - clock-names
> +    - ports
> +    - reg-io-width
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/jz4780-cgu.h>
> +
> +    hdmi: hdmi@10180000 {
> +        compatible = "ingenic,jz4780-hdmi";
> +        reg = <0x10180000 0x8000>;
> +        reg-io-width = <4>;
> +        ddc-i2c-bus = <&i2c4>;
> +        interrupt-parent = <&intc>;
> +        interrupts = <3>;
> +        clocks = <&cgu JZ4780_CLK_HDMI>, <&cgu JZ4780_CLK_AHB0>;
> +        clock-names = "isfr", "iahb";
> +
> +        ports {
> +            hdmi_in: port {
> +                #address-cells = <1>;
> +                #size-cells = <0>;
> +                hdmi_in_lcd: endpoint@0 {
> +                    reg = <0>;
> +                    remote-endpoint = <&jz4780_out_hdmi>;
> +                };
> +            };
> +        };
> +    };
> +
> +...
> -- 
> 2.25.1
> 
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Re: [RFC v3 1/8] dt-bindings: display: convert ingenic, lcd.txt to ingenic, lcd.yaml

[Sam Ravnborg]

Hi Nikolaus


Some comments below that will result in a simplee binding that passes
the checks.
Thanks for pushing this.

	Sam

On Sun, Mar 29, 2020 at 07:35:47PM +0200, H. Nikolaus Schaller wrote:
> and add compatible: jz4780-lcd, including an example how to
> configure both lcd controllers.
> 
> Also fix the clock names and examples.
> 
> Based on work by Paul Cercueil <paul@crapouillou.net> and
> Sam Ravnborg <sam@ravnborg.org>
> 
> Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
> Cc: Rob Herring <robh@kernel.org>
> Cc: devicetree@vger.kernel.org
> ---
>  .../bindings/display/ingenic,lcd.txt          |  45 ------
>  .../bindings/display/ingenic,lcd.yaml         | 128 ++++++++++++++++++
>  2 files changed, 128 insertions(+), 45 deletions(-)
>  delete mode 100644 Documentation/devicetree/bindings/display/ingenic,lcd.txt
>  create mode 100644 Documentation/devicetree/bindings/display/ingenic,lcd.yaml
> 
> diff --git a/Documentation/devicetree/bindings/display/ingenic,lcd.txt b/Documentation/devicetree/bindings/display/ingenic,lcd.txt
> deleted file mode 100644
> index 01e3261defb6..000000000000
> --- a/Documentation/devicetree/bindings/display/ingenic,lcd.txt
> +++ /dev/null
> @@ -1,45 +0,0 @@
> -Ingenic JZ47xx LCD driver
> -
> -Required properties:
> -- compatible: one of:
> -  * ingenic,jz4740-lcd
> -  * ingenic,jz4725b-lcd
> -  * ingenic,jz4770-lcd
> -- reg: LCD registers location and length
> -- clocks: LCD pixclock and device clock specifiers.
> -	   The device clock is only required on the JZ4740.
> -- clock-names: "lcd_pclk" and "lcd"
> -- interrupts: Specifies the interrupt line the LCD controller is connected to.
> -
> -Example:
> -
> -panel {
> -	compatible = "sharp,ls020b1dd01d";
> -
> -	backlight = <&backlight>;
> -	power-supply = <&vcc>;
> -
> -	port {
> -		panel_input: endpoint {
> -			remote-endpoint = <&panel_output>;
> -		};
> -	};
> -};
> -
> -
> -lcd: lcd-controller@13050000 {
> -	compatible = "ingenic,jz4725b-lcd";
> -	reg = <0x13050000 0x1000>;
> -
> -	interrupt-parent = <&intc>;
> -	interrupts = <31>;
> -
> -	clocks = <&cgu JZ4725B_CLK_LCD>;
> -	clock-names = "lcd";
> -
> -	port {
> -		panel_output: endpoint {
> -			remote-endpoint = <&panel_input>;
> -		};
> -	};
> -};
> diff --git a/Documentation/devicetree/bindings/display/ingenic,lcd.yaml b/Documentation/devicetree/bindings/display/ingenic,lcd.yaml
> new file mode 100644
> index 000000000000..8b6467cfc191
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/ingenic,lcd.yaml
> @@ -0,0 +1,128 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/display/ingenic,lcd.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Bindings for Ingenic JZ4780 LCD Controller
> +
> +maintainers:
> +  - Paul Cercueil <paul@crapouillou.net>
> +
> +description: |
> +  LCD Controller is the Display Controller for the Ingenic JZ47xx SoC
> +
> +properties:
> +  compatible:
> +    oneOf:
> +     - const: ingenic,jz4725b-lcd
> +     - const: ingenic,jz4740-lcd
> +     - const: ingenic,jz4770-lcd
> +     - const: ingenic,jz4780-lcd
> +
> +  reg:
> +    maxItems: 1
> +    description: LCD registers location and length
> +
> +  interrupts:
> +    maxItems: 1
> +    description: Specifies the interrupt provided by parent
> +
> +  clocks:
> +    maxItems: 2
> +    description: Clock specifiers for LCD pixclock and device clock.
> +      The device clock is only required on the JZ4740 and JZ4780
> +
> +  clock-names:
> +    items:
> +      - const: lcd
> +      - const: lcd_pclk
> +
> +  port:
> +    type: object
> +    description: |
> +      A port node with endpoint definitions as defined in
> +      Documentation/devicetree/bindings/media/video-interfaces.txt
> +
> +required:
> +    - compatible
> +    - reg
> +    - interrupts
> +    - clocks
> +    - clock-names
> +    - port
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/jz4725b-cgu.h>
> +
> +    panel {
> +      compatible = "sharp,ls020b1dd01d";
> +
> +      backlight = <&backlight>;
> +      power-supply = <&vcc>;
> +
> +      port {
> +        panel_input: endpoint {
> +          remote-endpoint = <&panel_output>;
> +          };
> +        };
> +      };
The panel part is not needed - better to drop it.


> +
> +    lcd: lcd-controller@13050000 {
> +      compatible = "ingenic,jz4725b-lcd";
> +      reg = <0x13050000 0x1000>;
> +
> +      interrupt-parent = <&intc>;
> +      interrupts = <31>;
> +
> +      clocks = <&cgu JZ4725B_CLK_LCD>;
> +      clock-names = "lcd", "lcd_pclk";
> +
> +      port {
> +        panel_output: endpoint {
> +          remote-endpoint = <&panel_input>;
> +          };
> +        };
> +      };
We know this example will not pass the check, as there is only
one clock specified.
I suggest to drop this example.
If it later turns out that jz4725b only have one clock, then the binding
needs to be updated. But the best guess is that the example is wrong.

The example below for jz4780-lcd cover all relevant parts - so
just keep it as the only example.

> +
> +  - |
> +    #include <dt-bindings/clock/jz4780-cgu.h>
> +
> +    lcdc0: lcdc0@13050000 {
Name this lcdc
And drop "lcdc0@13050000" as this is not relevant for this example.

Remember - the examples exist to explain the binding. They are
just examples.

> +        compatible = "ingenic,jz4780-lcd";
> +        reg = <0x13050000 0x1800>;
> +
> +        clocks = <&cgu JZ4780_CLK_TVE>, <&cgu JZ4780_CLK_LCD0PIXCLK>;
> +        clock-names = "lcd", "lcd_pclk";
> +
> +        interrupt-parent = <&intc>;
> +        interrupts = <31>;
> +
> +        jz4780_lcd_out: port {
> +            #address-cells = <1>;
> +            #size-cells = <0>;
> +
> +            jz4780_out_hdmi: endpoint@0 {
> +                reg = <0>;
> +                remote-endpoint = <&hdmi_in_lcd>;
> +            };
> +        };
> +    };
> +

And drop this as it does not add anything extra.
> +    lcdc1: lcdc1@130a0000 {
> +        compatible = "ingenic,jz4780-lcd";
> +        reg = <0x130a0000 0x1800>;
> +
> +        clocks = <&cgu JZ4780_CLK_TVE>, <&cgu JZ4780_CLK_LCD1PIXCLK>;
> +        clock-names = "lcd", "lcd_pclk";
> +
> +        interrupt-parent = <&intc>;
> +        interrupts = <31>;
> +
> +        status = "disabled";
> +    };

	Sam
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Re: [RFC v3 1/8] dt-bindings: display: convert ingenic, lcd.txt to ingenic, lcd.yaml

[Sam Ravnborg]

Hi Nikolaus.

> >> +
> >> +examples:
> >> +  - |
> >> +    #include <dt-bindings/clock/jz4725b-cgu.h>
> >> +
> >> +    panel {
> >> +      compatible = "sharp,ls020b1dd01d";
> >> +
> >> +      backlight = <&backlight>;
> >> +      power-supply = <&vcc>;
> >> +
> >> +      port {
> >> +        panel_input: endpoint {
> >> +          remote-endpoint = <&panel_output>;
> >> +          };
> >> +        };
> >> +      };
> > The panel part is not needed - better to drop it.
> 
> Well, it is needed to fulfill the remote-endpoint below.

Examples may have phandle that are not defined.
So the example will work fine without it.
See other similar examples.

> 
> > 
> > 
> >> +
> >> +    lcd: lcd-controller@13050000 {
> >> +      compatible = "ingenic,jz4725b-lcd";
> >> +      reg = <0x13050000 0x1000>;
> >> +
> >> +      interrupt-parent = <&intc>;
> >> +      interrupts = <31>;
> >> +
> >> +      clocks = <&cgu JZ4725B_CLK_LCD>;
> >> +      clock-names = "lcd", "lcd_pclk";
> >> +
> >> +      port {
> >> +        panel_output: endpoint {
> >> +          remote-endpoint = <&panel_input>;
> >> +          };
> >> +        };
> >> +      };
> > We know this example will not pass the check, as there is only
> > one clock specified.
> > I suggest to drop this example.
> > If it later turns out that jz4725b only have one clock,
> 
> Paul already reported that it only wants to see one clock.
> 
> > then the binding
> > needs to be updated.
> 
> Yes, I have that on my to-do list to update the binding to reflect
> this minItems/maxItems thing but I am not yet sure about how
> to handle the clock-names in that case. I.e. make "lcd" optional
> and enforce "lcd_pclk" only.
Look forward to next version.

> 
> > But the best guess is that the example is wrong.
> > 
> > The example below for jz4780-lcd cover all relevant parts - so
> > just keep it as the only example.
> > 
> >> +
> >> +  - |
> >> +    #include <dt-bindings/clock/jz4780-cgu.h>
> >> +
> >> +    lcdc0: lcdc0@13050000 {
> > Name this lcdc
> > And drop "lcdc0@13050000" as this is not relevant for this example.
> > 
> > Remember - the examples exist to explain the binding. They are
> > just examples.
> > 
> >> +        compatible = "ingenic,jz4780-lcd";
> >> +        reg = <0x13050000 0x1800>;
> >> +
> >> +        clocks = <&cgu JZ4780_CLK_TVE>, <&cgu JZ4780_CLK_LCD0PIXCLK>;
> >> +        clock-names = "lcd", "lcd_pclk";
> >> +
> >> +        interrupt-parent = <&intc>;
> >> +        interrupts = <31>;
> >> +
> >> +        jz4780_lcd_out: port {
> >> +            #address-cells = <1>;
> >> +            #size-cells = <0>;
> >> +
> >> +            jz4780_out_hdmi: endpoint@0 {
> >> +                reg = <0>;
> >> +                remote-endpoint = <&hdmi_in_lcd>;
> >> +            };
> >> +        };
> >> +    };
> >> +
> > 
> > And drop this as it does not add anything extra.
> 
> Well, it demonstrates how to add a second lcdc which is disabled.
The purpose of the example is to show an example of the
binding specified in this file.
Adding a second disabled lcdc is a general thing, and not
something we want in all the individual examples.

Also the actual content, for example register values can be
random as they are not part of the binding.
This is not a documentation of the HW but a binding example.

	Sam

> 
> Showing that it is possible to do so is IMHO the most important
> part of the example because it is not at all obvious.
> 
> I have also added both SoC to show how differently they can
> and should be.
> 
> >> +    lcdc1: lcdc1@130a0000 {
> >> +        compatible = "ingenic,jz4780-lcd";
> >> +        reg = <0x130a0000 0x1800>;
> >> +
> >> +        clocks = <&cgu JZ4780_CLK_TVE>, <&cgu JZ4780_CLK_LCD1PIXCLK>;
> >> +        clock-names = "lcd", "lcd_pclk";
> >> +
> >> +        interrupt-parent = <&intc>;
> >> +        interrupts = <31>;
> >> +
> >> +        status = "disabled";
> >> +    };
> > 
> > 	Sam
> 
> BR and thanks,
> Nikolaus
> 
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Re: [RFC v3 2/8] drm: ingenic-drm: add MODULE_DEVICE_TABLE

[Paul Cercueil]

Hi Nikolaus,


Le dim. 29 mars 2020 à 19:35, H. Nikolaus Schaller <hns@goldelico.com> 
a écrit :
> so that the driver can load by matching the device tree
> if compiled as module.
> 
> Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>

Please add:

Cc: stable@vger.kernel.org # v5.3+
Fixes: 90b86fcc47b4 ("DRM: Add KMS driver for the Ingenic JZ47xx SoCs")

And re-send this patch alone, then I can merge it ASAP.

Cheers,
-Paul

> ---
>  drivers/gpu/drm/ingenic/ingenic-drm.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/gpu/drm/ingenic/ingenic-drm.c 
> b/drivers/gpu/drm/ingenic/ingenic-drm.c
> index 6d47ef7b148c..bcba2f024842 100644
> --- a/drivers/gpu/drm/ingenic/ingenic-drm.c
> +++ b/drivers/gpu/drm/ingenic/ingenic-drm.c
> @@ -843,6 +843,7 @@ static const struct of_device_id 
> ingenic_drm_of_match[] = {
>  	{ .compatible = "ingenic,jz4770-lcd", .data = &jz4770_soc_info },
>  	{ /* sentinel */ },
>  };
> +MODULE_DEVICE_TABLE(of, ingenic_drm_of_match);
> 
>  static struct platform_driver ingenic_drm_driver = {
>  	.driver = {
> --
> 2.25.1
> 


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