clk: versatile: Add SP810 device tree bindings document

Signed-off-by: Pawel Moll <pawel.moll@arm.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

diff --git a/Documentation/devicetree/bindings/arm/sp810.txt b/Documentation/devicetree/bindings/arm/sp810.txt
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+SP810 System Controller
+-----------------------
+
+Required properties:
+
+- compatible:  standard compatible string for a Primecell peripheral,
+               see Documentation/devicetree/bindings/arm/primecell.txt
+               for more details
+               should be: "arm,sp810", "arm,primecell"
+
+- reg:         standard registers property, physical address and size
+               of the control registers
+
+- clock-names: from the common clock bindings, for more details see
+               Documentation/devicetree/bindings/clock/clock-bindings.txt;
+               should be: "refclk", "timclk", "apb_pclk"
+
+- clocks:      from the common clock bindings, phandle and clock
+               specifier pairs for the entries of clock-names property
+
+- #clock-cells: from the common clock bindings;
+               should be: <1>
+
+- clock-output-names: from the common clock bindings;
+               should be: "timerclken0", "timerclken1", "timerclken2", "timerclken3"
+
+Example:
+       sysctl@020000 {
+               compatible = "arm,sp810", "arm,primecell";
+               reg = <0x020000 0x1000>;
+               clocks = <&v2m_refclk32khz>, <&v2m_refclk1mhz>, <&smbclk>;
+               clock-names = "refclk", "timclk", "apb_pclk";
+               #clock-cells = <1>;
+               clock-output-names = "timerclken0", "timerclken1", "timerclken2", "timerclken3";
+       };