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-rw-r--r--Documentation/devicetree/bindings/gpio/gpio-samsung.txt43
1 files changed, 43 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/gpio/gpio-samsung.txt b/Documentation/devicetree/bindings/gpio/gpio-samsung.txt
index 5375625e8cd2..f1e5dfecf55d 100644
--- a/Documentation/devicetree/bindings/gpio/gpio-samsung.txt
+++ b/Documentation/devicetree/bindings/gpio/gpio-samsung.txt
@@ -39,3 +39,46 @@ Example:
39 #gpio-cells = <4>; 39 #gpio-cells = <4>;
40 gpio-controller; 40 gpio-controller;
41 }; 41 };
42
43
44Samsung S3C24XX GPIO Controller
45
46Required properties:
47- compatible: Compatible property value should be "samsung,s3c24xx-gpio".
48
49- reg: Physical base address of the controller and length of memory mapped
50 region.
51
52- #gpio-cells: Should be 3. The syntax of the gpio specifier used by client nodes
53 should be the following with values derived from the SoC user manual.
54 <[phandle of the gpio controller node]
55 [pin number within the gpio controller]
56 [mux function]
57 [flags and pull up/down]
58
59 Values for gpio specifier:
60 - Pin number: depending on the controller a number from 0 up to 15.
61 - Mux function: Depending on the SoC and the gpio bank the gpio can be set
62 as input, output or a special function
63 - Flags and Pull Up/Down: the values to use differ for the individual SoCs
64 example S3C2416/S3C2450:
65 0 - Pull Up/Down Disabled.
66 1 - Pull Down Enabled.
67 2 - Pull Up Enabled.
68 Bit 16 (0x00010000) - Input is active low.
69 Consult the user manual for the correct values of Mux and Pull Up/Down.
70
71- gpio-controller: Specifies that the node is a gpio controller.
72- #address-cells: should be 1.
73- #size-cells: should be 1.
74
75Example:
76
77 gpa: gpio-controller@56000000 {
78 #address-cells = <1>;
79 #size-cells = <1>;
80 compatible = "samsung,s3c24xx-gpio";
81 reg = <0x56000000 0x10>;
82 #gpio-cells = <3>;
83 gpio-controller;
84 };