Merge branch 'autofs' (patches from Ian Kent)

[~andy/linux] / Documentation / devicetree / bindings / gpio / gpio-samsung.txt

diff --git a/Documentation/devicetree/bindings/gpio/gpio-samsung.txt b/Documentation/devicetree/bindings/gpio/gpio-samsung.txt
index 5375625e8cd2bdfb07e7a935286bd1d50eb873b4..f1e5dfecf55def351aa4d63fe9a241ac6d495441 100644 (file)
--- a/Documentation/devicetree/bindings/gpio/gpio-samsung.txt
+++ b/Documentation/devicetree/bindings/gpio/gpio-samsung.txt
@@ -39,3 +39,46 @@ Example:
                #gpio-cells = <4>;
                gpio-controller;
        };
+
+
+Samsung S3C24XX GPIO Controller
+
+Required properties:
+- compatible: Compatible property value should be "samsung,s3c24xx-gpio".
+
+- reg: Physical base address of the controller and length of memory mapped
+  region.
+
+- #gpio-cells: Should be 3. The syntax of the gpio specifier used by client nodes
+  should be the following with values derived from the SoC user manual.
+     <[phandle of the gpio controller node]
+      [pin number within the gpio controller]
+      [mux function]
+      [flags and pull up/down]
+
+  Values for gpio specifier:
+  - Pin number: depending on the controller a number from 0 up to 15.
+  - Mux function: Depending on the SoC and the gpio bank the gpio can be set
+                  as input, output or a special function
+  - Flags and Pull Up/Down: the values to use differ for the individual SoCs
+                    example S3C2416/S3C2450:
+                            0 - Pull Up/Down Disabled.
+                            1 - Pull Down Enabled.
+                            2 - Pull Up Enabled.
+          Bit 16 (0x00010000) - Input is active low.
+  Consult the user manual for the correct values of Mux and Pull Up/Down.
+
+- gpio-controller: Specifies that the node is a gpio controller.
+- #address-cells: should be 1.
+- #size-cells: should be 1.
+
+Example:
+
+       gpa: gpio-controller@56000000 {
+               #address-cells = <1>;
+               #size-cells = <1>;
+               compatible = "samsung,s3c24xx-gpio";
+               reg = <0x56000000 0x10>;
+               #gpio-cells = <3>;
+               gpio-controller;
+       };