spi/bcm63xx: document bcm63xx SPI devicetree bindings

[linux-2.6-microblaze.git] / Documentation / devicetree / bindings / spi / spi-bcm63xx.txt

diff --git a/Documentation/devicetree/bindings/spi/spi-bcm63xx.txt b/Documentation/devicetree/bindings/spi/spi-bcm63xx.txt
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+Binding for Broadcom BCM6348/BCM6358 SPI controller
+
+Required properties:
+- compatible: must contain one of "brcm,bcm6348-spi", "brcm,bcm6358-spi".
+- reg: Base address and size of the controllers memory area.
+- interrupts: Interrupt for the SPI block.
+- clocks: phandle of the SPI clock.
+- clock-names: has to be "spi".
+- #address-cells: <1>, as required by generic SPI binding.
+- #size-cells: <0>, also as required by generic SPI binding.
+
+Optional properties:
+- num-cs: some controllers have less than 8 cs signals. Defaults to 8
+  if absent.
+
+Child nodes as per the generic SPI binding.
+
+Example:
+
+       spi@10000800 {
+               compatible = "brcm,bcm6368-spi", "brcm,bcm6358-spi";
+               reg = <0x10000800 0x70c>;
+
+               interrupts = <1>;
+
+               clocks = <&clkctl 9>;
+               clock-names = "spi";
+
+               num-cs = <5>;
+
+               #address-cells = <1>;
+               #size-cells = <0>;
+       };