clk: max77802: Add DT binding documentation

Add Device Tree binding documentation for the clocks
outputs in the Maxim 77802 Power Management IC.

Signed-off-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Signed-off-by: Mike Turquette <mturquette@linaro.org>

1 files changed, 44 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/clock/maxim,max77802.txt b/Documentation/devicetree/bindings/clock/maxim,max77802.txt
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index 000000000000..c6dc7835f06c
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+++ b/Documentation/devicetree/bindings/clock/maxim,max77802.txt
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+Binding for Maxim MAX77802 32k clock generator block
+
+This is a part of device tree bindings of MAX77802 multi-function device.
+More information can be found in bindings/mfd/max77802.txt file.
+
+The MAX77802 contains two 32.768khz clock outputs that can be controlled
+(gated/ungated) over I2C.
+
+Following properties should be present in main device node of the MFD chip.
+
+Required properties:
+- #clock-cells: From common clock binding; shall be set to 1.
+
+Optional properties:
+- clock-output-names: From common clock binding.
+
+Each clock is assigned an identifier and client nodes can use this identifier
+to specify the clock which they consume. Following indices are allowed:
+     - 0: 32khz_ap clock,
+     - 1: 32khz_cp clock.
+
+Clocks are defined as preprocessor macros in dt-bindings/clock/maxim,max77802.h
+header and can be used in device tree sources.
+
+Example: Node of the MFD chip
+
+        max77802: max77802@09 {
+                compatible = "maxim,max77802";
+                interrupt-parent = <&wakeup_eint>;
+                interrupts = <26 0>;
+                reg = <0x09>;
+                #clock-cells = <1>;
+
+                /* ... */
+        };
+
+Example: Clock consumer node
+
+        foo@0 {
+                compatible = "bar,foo";
+                /* ... */
+                clock-names = "my-clock";
+                clocks = <&max77802 MAX77802_CLK_32K_AP>;
+        };