[PATCH 0/4] ARM: dts: exynos: Enable HDMI in Arndale Octa board

This patch-set enables HDMI in Arndale Octa board and fixes HPD DT property.
It also includes code refactoring on ddc and phy.

Milo Kim (4):
  ARM: dts: exynos: Enable HDMI for Arndale Octa board
  ARM: dts: exynos: Use 'hpd-gpios' instead of 'hpd-gpio'
  gpu: drm: exynos_hdmi: Use consolidated function on binding DDC DT
    property
  gpu: drm: exynos_hdmi: Use consolidated function on binding PHY DT
    property

 .../bindings/display/exynos/exynos_hdmi.txt        |  4 +--
 arch/arm/boot/dts/exynos4210-universal_c210.dts    |  2 +-
 arch/arm/boot/dts/exynos4412-odroid-common.dtsi    |  2 +-
 arch/arm/boot/dts/exynos5250-arndale.dts           |  2 +-
 arch/arm/boot/dts/exynos5250-smdk5250.dts          |  2 +-
 arch/arm/boot/dts/exynos5250-snow-common.dtsi      |  2 +-
 arch/arm/boot/dts/exynos5250-spring.dts            |  2 +-
 arch/arm/boot/dts/exynos5420-arndale-octa.dts      | 17 +++++++++
 arch/arm/boot/dts/exynos5420-peach-pit.dts         |  2 +-
 arch/arm/boot/dts/exynos5420-smdk5420.dts          |  2 +-
 arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi |  2 +-
 arch/arm/boot/dts/exynos5800-peach-pi.dts          |  2 +-
 drivers/gpu/drm/exynos/exynos_hdmi.c               | 41 ++++++++++++----------
 13 files changed, 52 insertions(+), 30 deletions(-)

-- 
1.9.1

* Support HDMI display data channel
  I2C #2 is assigned for the HDMI DDC. It enables the EDID access.

* GPIO for HDMI hot plug detect
  GPX3_7 is used. The HPD awareness is done when the GPIO is active high and
  single ended.

* Enable HDMI block in Exynos5420
  HDMI PLL consumes 1.0V LDO6 (PVDD_ANAIP_1V0) and HDMI oscillator requires
  1.8V LDO7 (PVDD_ANAIP_1V8).

Cc: Inki Dae <inki.dae@samsung.com>
Cc: Joonyoung Shim <redacted>
Cc: Seung-Woo Kim <sw0312.kim@samsung.com>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: devicetree at vger.kernel.org
Cc: linux-arm-kernel at lists.infradead.org
Cc: linux-samsung-soc at vger.kernel.org
Cc: linux-kernel at vger.kernel.org
Cc: dri-devel at lists.freedesktop.org
Signed-off-by: Milo Kim <redacted>
---
 arch/arm/boot/dts/exynos5420-arndale-octa.dts | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/arch/arm/boot/dts/exynos5420-arndale-octa.dts b/arch/arm/boot/dts/exynos5420-arndale-octa.dts
index 39a3b81..df362a2 100644
--- a/arch/arm/boot/dts/exynos5420-arndale-octa.dts
+++ b/arch/arm/boot/dts/exynos5420-arndale-octa.dts

@@ -70,6 +70,23 @@
 	status = "disabled";
 };
 
+&i2c_2 {
+	samsung,i2c-slave-addr = <0x50>;
+	status = "okay";
+
+	hdmiddc at 50 {
+		compatible = "samsung,exynos4210-hdmiddc";
+		reg = <0x50>;
+	};
+};
+
+&hdmi {
+	hpd-gpios = <&gpx3 7 GPIO_OPEN_SOURCE>;
+	vdd_osc-supply = <&ldo7_reg>;
+	vdd_pll-supply = <&ldo6_reg>;
+	status = "okay";
+};
+
 &hsi2c_4 {
 	status = "okay";
 

-- 
1.9.1

This patch enables getting a HPD GPIO descriptor quickly.
The exynos-hdmi driver uses "hpd" for HDMI hot plug detection.

	static int hdmi_resources_init(struct hdmi_context *hdata)
	{
		...
		hdata->hpd_gpio = devm_gpiod_get(dev, "hpd", GPIOD_IN);
		...
	}

This calls 'of_find_gpio()' and it generates the GPIO consumer ID by referring
GPIO suffix. So 'hpd-gpios' is preferred on getting a GPIO descriptor.

However, if the device tree uses 'hpd-gpio', then the exynos-hdmi driver
always retries to get a GPIO descriptor because the first GPIO suffix is not
'gpio' but 'gpios'. So you always see the debug message below.

	of_get_named_gpiod_flags: can't parse 'hpd-gpios' property of node '/soc/hdmi at 14530000[0]'

Use the preferred property, 'hpd-gpios' instead of 'hpd-gpio'.

Cc: Inki Dae <inki.dae@samsung.com>
Cc: Joonyoung Shim <redacted>
Cc: Seung-Woo Kim <sw0312.kim@samsung.com>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: devicetree at vger.kernel.org
Cc: linux-arm-kernel at lists.infradead.org
Cc: linux-samsung-soc at vger.kernel.org
Cc: linux-kernel at vger.kernel.org
Cc: dri-devel at lists.freedesktop.org
Signed-off-by: Milo Kim <redacted>
---
 Documentation/devicetree/bindings/display/exynos/exynos_hdmi.txt | 4 ++--
 arch/arm/boot/dts/exynos4210-universal_c210.dts                  | 2 +-
 arch/arm/boot/dts/exynos4412-odroid-common.dtsi                  | 2 +-
 arch/arm/boot/dts/exynos5250-arndale.dts                         | 2 +-
 arch/arm/boot/dts/exynos5250-smdk5250.dts                        | 2 +-
 arch/arm/boot/dts/exynos5250-snow-common.dtsi                    | 2 +-
 arch/arm/boot/dts/exynos5250-spring.dts                          | 2 +-
 arch/arm/boot/dts/exynos5420-peach-pit.dts                       | 2 +-
 arch/arm/boot/dts/exynos5420-smdk5420.dts                        | 2 +-
 arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi               | 2 +-
 arch/arm/boot/dts/exynos5800-peach-pi.dts                        | 2 +-
 11 files changed, 12 insertions(+), 12 deletions(-)

diff --git a/Documentation/devicetree/bindings/display/exynos/exynos_hdmi.txt b/Documentation/devicetree/bindings/display/exynos/exynos_hdmi.txt
index a2ec4c1..6394ea9 100644
--- a/Documentation/devicetree/bindings/display/exynos/exynos_hdmi.txt
+++ b/Documentation/devicetree/bindings/display/exynos/exynos_hdmi.txt

@@ -9,7 +9,7 @@ Required properties:
 - reg: physical base address of the hdmi and length of memory mapped
 	region.
 - interrupts: interrupt number to the cpu.
-- hpd-gpio: following information about the hotplug gpio pin.
+- hpd-gpios: following information about the hotplug gpio pin.
 	a) phandle of the gpio controller node.
 	b) pin number within the gpio controller.
 	c) optional flags and pull up/down.

@@ -56,7 +56,7 @@ Example:
 		compatible = "samsung,exynos4212-hdmi";
 		reg = <0x14530000 0x100000>;
 		interrupts = <0 95 0>;
-		hpd-gpio = <&gpx3 7 1>;
+		hpd-gpios = <&gpx3 7 1>;
 		ddc = <&hdmi_ddc_node>;
 		phy = <&hdmi_phy_node>;
 		samsung,syscon-phandle = <&pmu_system_controller>;

diff --git a/arch/arm/boot/dts/exynos4210-universal_c210.dts b/arch/arm/boot/dts/exynos4210-universal_c210.dts
index 9a75e3e..cf95202 100644
--- a/arch/arm/boot/dts/exynos4210-universal_c210.dts
+++ b/arch/arm/boot/dts/exynos4210-universal_c210.dts

@@ -269,7 +269,7 @@
 };
 
 &hdmi {
-	hpd-gpio = <&gpx3 7 GPIO_ACTIVE_HIGH>;
+	hpd-gpios = <&gpx3 7 GPIO_ACTIVE_HIGH>;
 	pinctrl-names = "default";
 	pinctrl-0 = <&hdmi_hpd>;
 	hdmi-en-supply = <&hdmi_en>;

diff --git a/arch/arm/boot/dts/exynos4412-odroid-common.dtsi b/arch/arm/boot/dts/exynos4412-odroid-common.dtsi
index 58ad48e7..be644fe 100644
--- a/arch/arm/boot/dts/exynos4412-odroid-common.dtsi
+++ b/arch/arm/boot/dts/exynos4412-odroid-common.dtsi

@@ -227,7 +227,7 @@
 };
 
 &hdmi {
-	hpd-gpio = <&gpx3 7 GPIO_ACTIVE_HIGH>;
+	hpd-gpios = <&gpx3 7 GPIO_ACTIVE_HIGH>;
 	pinctrl-names = "default";
 	pinctrl-0 = <&hdmi_hpd>;
 	vdd-supply = <&ldo8_reg>;

diff --git a/arch/arm/boot/dts/exynos5250-arndale.dts b/arch/arm/boot/dts/exynos5250-arndale.dts
index ea70603..3d981f3 100644
--- a/arch/arm/boot/dts/exynos5250-arndale.dts
+++ b/arch/arm/boot/dts/exynos5250-arndale.dts

@@ -152,7 +152,7 @@
 };
 
 &hdmi {
-	hpd-gpio = <&gpx3 7 GPIO_ACTIVE_LOW>;
+	hpd-gpios = <&gpx3 7 GPIO_ACTIVE_LOW>;
 	vdd_osc-supply = <&ldo10_reg>;
 	vdd_pll-supply = <&ldo8_reg>;
 	vdd-supply = <&ldo8_reg>;

diff --git a/arch/arm/boot/dts/exynos5250-smdk5250.dts b/arch/arm/boot/dts/exynos5250-smdk5250.dts
index 381af13..7f27263 100644
--- a/arch/arm/boot/dts/exynos5250-smdk5250.dts
+++ b/arch/arm/boot/dts/exynos5250-smdk5250.dts

@@ -116,7 +116,7 @@
 };
 
 &hdmi {
-	hpd-gpio = <&gpx3 7 GPIO_ACTIVE_HIGH>;
+	hpd-gpios = <&gpx3 7 GPIO_ACTIVE_HIGH>;
 };
 
 &i2c_0 {

diff --git a/arch/arm/boot/dts/exynos5250-snow-common.dtsi b/arch/arm/boot/dts/exynos5250-snow-common.dtsi
index fadbea7..1055d25 100644
--- a/arch/arm/boot/dts/exynos5250-snow-common.dtsi
+++ b/arch/arm/boot/dts/exynos5250-snow-common.dtsi

@@ -260,7 +260,7 @@
 };
 
 &hdmi {
-	hpd-gpio = <&gpx3 7 GPIO_ACTIVE_HIGH>;
+	hpd-gpios = <&gpx3 7 GPIO_ACTIVE_HIGH>;
 	pinctrl-names = "default";
 	pinctrl-0 = <&hdmi_hpd_irq>;
 	phy = <&hdmiphy>;

diff --git a/arch/arm/boot/dts/exynos5250-spring.dts b/arch/arm/boot/dts/exynos5250-spring.dts
index 44f4292..1d52a79 100644
--- a/arch/arm/boot/dts/exynos5250-spring.dts
+++ b/arch/arm/boot/dts/exynos5250-spring.dts

@@ -91,7 +91,7 @@
 };
 
 &hdmi {
-	hpd-gpio = <&gpx3 7 GPIO_ACTIVE_HIGH>;
+	hpd-gpios = <&gpx3 7 GPIO_ACTIVE_HIGH>;
 	pinctrl-names = "default";
 	pinctrl-0 = <&hdmi_hpd_irq>;
 	phy = <&hdmiphy>;

diff --git a/arch/arm/boot/dts/exynos5420-peach-pit.dts b/arch/arm/boot/dts/exynos5420-peach-pit.dts
index fe4e091..f6f256f 100644
--- a/arch/arm/boot/dts/exynos5420-peach-pit.dts
+++ b/arch/arm/boot/dts/exynos5420-peach-pit.dts

@@ -179,7 +179,7 @@
 
 &hdmi {
 	status = "okay";
-	hpd-gpio = <&gpx3 7 GPIO_ACTIVE_HIGH>;
+	hpd-gpios = <&gpx3 7 GPIO_ACTIVE_HIGH>;
 	pinctrl-names = "default";
 	pinctrl-0 = <&hdmi_hpd_irq>;
 	ddc = <&i2c_2>;

diff --git a/arch/arm/boot/dts/exynos5420-smdk5420.dts b/arch/arm/boot/dts/exynos5420-smdk5420.dts
index ed8f342..2954646 100644
--- a/arch/arm/boot/dts/exynos5420-smdk5420.dts
+++ b/arch/arm/boot/dts/exynos5420-smdk5420.dts

@@ -130,7 +130,7 @@
 
 &hdmi {
 	status = "okay";
-	hpd-gpio = <&gpx3 7 GPIO_ACTIVE_HIGH>;
+	hpd-gpios = <&gpx3 7 GPIO_ACTIVE_HIGH>;
 	pinctrl-names = "default";
 	pinctrl-0 = <&hdmi_hpd_irq>;
 };

diff --git a/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi b/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi
index d562530..47c113c 100644
--- a/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi
+++ b/arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi

@@ -250,7 +250,7 @@
 
 &hdmi {
 	status = "okay";
-	hpd-gpio = <&gpx3 7 GPIO_ACTIVE_HIGH>;
+	hpd-gpios = <&gpx3 7 GPIO_ACTIVE_HIGH>;
 	pinctrl-names = "default";
 	pinctrl-0 = <&hdmi_hpd_irq>;
 

diff --git a/arch/arm/boot/dts/exynos5800-peach-pi.dts b/arch/arm/boot/dts/exynos5800-peach-pi.dts
index 5ec71e2..51a8bca 100644
--- a/arch/arm/boot/dts/exynos5800-peach-pi.dts
+++ b/arch/arm/boot/dts/exynos5800-peach-pi.dts

@@ -179,7 +179,7 @@
 
 &hdmi {
 	status = "okay";
-	hpd-gpio = <&gpx3 7 GPIO_ACTIVE_HIGH>;
+	hpd-gpios = <&gpx3 7 GPIO_ACTIVE_HIGH>;
 	pinctrl-names = "default";
 	pinctrl-0 = <&hdmi_hpd_irq>;
 	ddc = <&i2c_2>;

-- 
1.9.1

Handle legacy and raw 'phy' parsing in single function.
And it also removes goto condition.

Cc: Inki Dae <inki.dae@samsung.com>
Cc: Joonyoung Shim <redacted>
Cc: Seung-Woo Kim <sw0312.kim@samsung.com>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: devicetree at vger.kernel.org
Cc: linux-arm-kernel at lists.infradead.org
Cc: linux-samsung-soc at vger.kernel.org
Cc: linux-kernel at vger.kernel.org
Cc: dri-devel at lists.freedesktop.org
Signed-off-by: Milo Kim <redacted>
---
 drivers/gpu/drm/exynos/exynos_hdmi.c | 23 ++++++++++++++---------
 1 file changed, 14 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos_hdmi.c b/drivers/gpu/drm/exynos/exynos_hdmi.c
index 6a636f2..bb2d6d4 100644
--- a/drivers/gpu/drm/exynos/exynos_hdmi.c
+++ b/drivers/gpu/drm/exynos/exynos_hdmi.c

@@ -1778,11 +1778,22 @@ static struct device_node *hdmi_ddc_dt_binding(struct device *dev)
 	return np;
 }
 
-static struct device_node *hdmi_legacy_phy_dt_binding(struct device *dev)
+static struct device_node *hdmi_phy_dt_binding(struct device *dev)
 {
 	const char *compatible_str = "samsung,exynos4212-hdmiphy";
+	struct device_node *np;
+
+	np = of_find_compatible_node(NULL, NULL, compatible_str);
+	if (np)
+		return np;
+
+	np = of_parse_phandle(dev->of_node, "phy", 0);
+	if (!np)
+		return NULL;
+
+	of_node_put(dev->of_node);
 
-	return of_find_compatible_node(NULL, NULL, compatible_str);
+	return np;
 }
 
 static int hdmi_probe(struct platform_device *pdev)

@@ -1829,19 +1840,13 @@ static int hdmi_probe(struct platform_device *pdev)
 		return -EPROBE_DEFER;
 	}
 
-	phy_node = hdmi_legacy_phy_dt_binding(dev);
-	if (phy_node)
-		goto out_get_phy_port;
-
-	phy_node = of_parse_phandle(dev->of_node, "phy", 0);
+	phy_node = hdmi_phy_dt_binding(dev);
 	if (!phy_node) {
 		DRM_ERROR("Failed to find hdmiphy node in device tree\n");
 		ret = -ENODEV;
 		goto err_ddc;
 	}
-	of_node_put(dev->of_node);
 
-out_get_phy_port:
 	if (hdata->drv_data->is_apb_phy) {
 		hdata->regs_hdmiphy = of_iomap(phy_node, 0);
 		if (!hdata->regs_hdmiphy) {

-- 
1.9.1

Handle legacy and raw 'ddc' parsing in single function.
And it also removes goto condition.

Cc: Inki Dae <inki.dae@samsung.com>
Cc: Joonyoung Shim <redacted>
Cc: Seung-Woo Kim <sw0312.kim@samsung.com>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: devicetree at vger.kernel.org
Cc: linux-arm-kernel at lists.infradead.org
Cc: linux-samsung-soc at vger.kernel.org
Cc: linux-kernel at vger.kernel.org
Cc: dri-devel at lists.freedesktop.org
Signed-off-by: Milo Kim <redacted>
---
 drivers/gpu/drm/exynos/exynos_hdmi.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos_hdmi.c b/drivers/gpu/drm/exynos/exynos_hdmi.c
index 2275efe..6a636f2 100644
--- a/drivers/gpu/drm/exynos/exynos_hdmi.c
+++ b/drivers/gpu/drm/exynos/exynos_hdmi.c

@@ -1760,7 +1760,7 @@ static const struct component_ops hdmi_component_ops = {
 	.unbind = hdmi_unbind,
 };
 
-static struct device_node *hdmi_legacy_ddc_dt_binding(struct device *dev)
+static struct device_node *hdmi_ddc_dt_binding(struct device *dev)
 {
 	const char *compatible_str = "samsung,exynos4210-hdmiddc";
 	struct device_node *np;

@@ -1769,7 +1769,13 @@ static struct device_node *hdmi_legacy_ddc_dt_binding(struct device *dev)
 	if (np)
 		return of_get_next_parent(np);
 
-	return NULL;
+	np = of_parse_phandle(dev->of_node, "ddc", 0);
+	if (!np)
+		return NULL;
+
+	of_node_put(dev->of_node);
+
+	return np;
 }
 
 static struct device_node *hdmi_legacy_phy_dt_binding(struct device *dev)

@@ -1811,18 +1817,12 @@ static int hdmi_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	ddc_node = hdmi_legacy_ddc_dt_binding(dev);
-	if (ddc_node)
-		goto out_get_ddc_adpt;
-
-	ddc_node = of_parse_phandle(dev->of_node, "ddc", 0);
+	ddc_node = hdmi_ddc_dt_binding(dev);
 	if (!ddc_node) {
 		DRM_ERROR("Failed to find ddc node in device tree\n");
 		return -ENODEV;
 	}
-	of_node_put(dev->of_node);
 
-out_get_ddc_adpt:
 	hdata->ddc_adpt = of_find_i2c_adapter_by_node(ddc_node);
 	if (!hdata->ddc_adpt) {
 		DRM_ERROR("Failed to get ddc i2c adapter by node\n");

-- 
1.9.1

On Tue, Aug 23, 2016 at 11:13 AM, Milo Kim [off-list ref] wrote:

This patch-set enables HDMI in Arndale Octa board and fixes HPD DT property.
It also includes code refactoring on ddc and phy.

Milo Kim (4):
  ARM: dts: exynos: Enable HDMI for Arndale Octa board
  ARM: dts: exynos: Use 'hpd-gpios' instead of 'hpd-gpio'
  gpu: drm: exynos_hdmi: Use consolidated function on binding DDC DT
    property
  gpu: drm: exynos_hdmi: Use consolidated function on binding PHY DT
    property

I saw DTS patches on linux-samsung-soc patchwork but still I would
appreciate if you send them to appropriate maintainers pointed by
get_maintainers.pl script. DTS stuff goes through samsung-soc tree.

Best regards,
Krzysztof

On Tue, Aug 23, 2016 at 06:13:37PM +0900, Milo Kim wrote:

This patch enables getting a HPD GPIO descriptor quickly.
The exynos-hdmi driver uses "hpd" for HDMI hot plug detection.

	static int hdmi_resources_init(struct hdmi_context *hdata)
	{
		...
		hdata->hpd_gpio = devm_gpiod_get(dev, "hpd", GPIOD_IN);
		...
	}

This calls 'of_find_gpio()' and it generates the GPIO consumer ID by referring
GPIO suffix. So 'hpd-gpios' is preferred on getting a GPIO descriptor.

However, if the device tree uses 'hpd-gpio', then the exynos-hdmi driver
always retries to get a GPIO descriptor because the first GPIO suffix is not
'gpio' but 'gpios'. So you always see the debug message below.

	of_get_named_gpiod_flags: can't parse 'hpd-gpios' property of node '/soc/hdmi at 14530000[0]'

Use the preferred property, 'hpd-gpios' instead of 'hpd-gpio'.

Cc: Inki Dae <inki.dae@samsung.com>
Cc: Joonyoung Shim <redacted>
Cc: Seung-Woo Kim <sw0312.kim@samsung.com>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: devicetree at vger.kernel.org
Cc: linux-arm-kernel at lists.infradead.org
Cc: linux-samsung-soc at vger.kernel.org
Cc: linux-kernel at vger.kernel.org
Cc: dri-devel at lists.freedesktop.org
Signed-off-by: Milo Kim <redacted>
---
 Documentation/devicetree/bindings/display/exynos/exynos_hdmi.txt | 4 ++--
 arch/arm/boot/dts/exynos4210-universal_c210.dts                  | 2 +-
 arch/arm/boot/dts/exynos4412-odroid-common.dtsi                  | 2 +-
 arch/arm/boot/dts/exynos5250-arndale.dts                         | 2 +-
 arch/arm/boot/dts/exynos5250-smdk5250.dts                        | 2 +-
 arch/arm/boot/dts/exynos5250-snow-common.dtsi                    | 2 +-
 arch/arm/boot/dts/exynos5250-spring.dts                          | 2 +-
 arch/arm/boot/dts/exynos5420-peach-pit.dts                       | 2 +-
 arch/arm/boot/dts/exynos5420-smdk5420.dts                        | 2 +-
 arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi               | 2 +-
 arch/arm/boot/dts/exynos5800-peach-pi.dts                        | 2 +-
 11 files changed, 12 insertions(+), 12 deletions(-)

Acked-by: Rob Herring <robh@kernel.org>

On 08/24/2016 04:55 AM, Krzysztof Kozlowski wrote:

I saw DTS patches on linux-samsung-soc patchwork but still I would
appreciate if you send them to appropriate maintainers pointed by
get_maintainers.pl script. DTS stuff goes through samsung-soc tree.

Thanks for your tip. I've just sent out the v2.

Best regards,
Milo