ARM: dts: exynos: Use 'hpd-gpios' instead of 'hpd-gpio'

This patch enables getting a HPD GPIO descriptor quicker.
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@14530000[0]'

Use the preferred property, 'hpd-gpios' instead of 'hpd-gpio'.
Acked-by: Rob Herring <robh@kernel.org>
Reviewed-by: Andrzej Hajda <a.hajda@samsung.com>
Cc: devicetree@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-samsung-soc@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Milo Kim <woogyom.kim@gmail.com>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>

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>;

arch/arm/boot/dts/exynos4210-universal_c210.dts

@@ -269,7 +269,7 @@ fimd_dpi_ep: endpoint {
 };
 
 &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>;

arch/arm/boot/dts/exynos4412-odroid-common.dtsi

@@ -227,7 +227,7 @@ &fimc_3 {
 };
 
 &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>;

arch/arm/boot/dts/exynos5250-arndale.dts

@@ -152,7 +152,7 @@ &fimd {
 };
 
 &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>;

arch/arm/boot/dts/exynos5250-smdk5250.dts

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

arch/arm/boot/dts/exynos5250-snow-common.dtsi

@@ -260,7 +260,7 @@ &fimd {
 };
 
 &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>;

arch/arm/boot/dts/exynos5250-spring.dts

@@ -91,7 +91,7 @@ &fimd {
 };
 
 &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>;

arch/arm/boot/dts/exynos5420-peach-pit.dts

@@ -179,7 +179,7 @@ &fimd {
 
 &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>;

arch/arm/boot/dts/exynos5420-smdk5420.dts

@@ -130,7 +130,7 @@ &fimd {
 
 &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>;
 };

arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi

@@ -250,7 +250,7 @@ &cpu4 {
 
 &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>;
 

arch/arm/boot/dts/exynos5800-peach-pi.dts

@@ -179,7 +179,7 @@ &fimd {
 
 &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>;