Merge tag 'exynos-dt-2' of git://git.kernel.org/pub/scm/linux/kernel/git/kgene/linux-samsung into next/dt

From Kukjin Kim:

2nd exynos dt update based on tags/exynos-dt-1
- enable RTC on exynos5250 snow and Arndale boards
- add support LCD and PWM for exynos4210 Origen board
- update bootargs to support 8GiB for exynos5440 SSDK5440 and SD5v1 boards
- enable spi and add opp level for exynos5440
- add example doc for samsung-pinctrl dt bindings

* tag 'exynos-dt-2' of git://git.kernel.org/pub/scm/linux/kernel/git/kgene/linux-samsung:
  ARM: dts: Set BUCK7 as always on for Origen board
  ARM: dts: Add FIMD node to Origen4210 board
  ARM: dts: Add LCD related pinctrl entries for exynos4210
  ARM: dts: Add PWM related pinctrl entries for exynos4210
  Documentation: Add examples to samsung-pinctrl device tree bindings documentation
  ARM: dts: Enable RTC node for exynos5250-snow
  ARM: dts: Enable RTC node for Arndale
  ARM: dts: Removing pdma for exynos5440
  ARM: dts: update bootargs to support 8GiB for SSDK5440 and SD5v1
  ARM: dts: Add more opp levels in exynos5440
  ARM: dts: Add wm8994 regulator support on smdk5250
  ARM: dts: enable spi for EXYNOS5440 SOC

Signed-off-by: Arnd Bergmann <arnd@arndb.de>

1 files changed, 42 insertions, 2 deletions

diff --git a/Documentation/devicetree/bindings/pinctrl/samsung-pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/samsung-pinctrl.txt
index c70fca146e9..e15cfc4bb39 100644
--- a/Documentation/devicetree/bindings/pinctrl/samsung-pinctrl.txt
+++ b/Documentation/devicetree/bindings/pinctrl/samsung-pinctrl.txt
@@ -21,8 +21,18 @@ Required Properties:
 
   - gpio-controller: identifies the node as a gpio controller and pin bank.
   - #gpio-cells: number of cells in GPIO specifier. Since the generic GPIO
-    binding is used, the amount of cells must be specified as 2. See generic
-    GPIO binding documentation for description of particular cells.
+    binding is used, the amount of cells must be specified as 2. See the below
+    mentioned gpio binding representation for description of particular cells.
+
+	Eg: <&gpx2 6 0>
+	<[phandle of the gpio controller node]
+	[pin number within the gpio controller]
+	[flags]>
+
+	Values for gpio specifier:
+	- Pin number: is a value between 0 to 7.
+	- Flags: 0 - Active High
+		 1 - Active Low
 
 - Pin mux/config groups as child nodes: The pin mux (selecting pin function
   mode) and pin config (pull up/down, driver strength) settings are represented
@@ -266,3 +276,33 @@ Example 4: Set up the default pin state for uart controller.
 
 		pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
 	}
+
+Example 5: A display port client node that supports 'default' pinctrl state
+	   and gpio binding.
+
+	display-port-controller {
+		/* ... */
+
+		samsung,hpd-gpio = <&gpx2 6 0>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&dp_hpd>;
+	};
+
+Example 6: Request the gpio for display port controller
+
+	static int exynos_dp_probe(struct platform_device *pdev)
+	{
+		int hpd_gpio, ret;
+		struct device *dev = &pdev->dev;
+		struct device_node *dp_node = dev->of_node;
+
+		/* ... */
+
+		hpd_gpio = of_get_named_gpio(dp_node, "samsung,hpd-gpio", 0);
+
+		/* ... */
+
+		ret = devm_gpio_request_one(&pdev->dev, hpd_gpio, GPIOF_IN,
+					    "hpd_gpio");
+		/* ... */
+	}