spi/bcm63xx: document bcm63xx SPI devicetree bindings

Add documentation for the bindings of the low speed SPI controller found
on most bcm63xx SoCs.

Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 33 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/spi/spi-bcm63xx.txt b/Documentation/devicetree/bindings/spi/spi-bcm63xx.txt
new file mode 100644
index 000000000000..1c16f6692613
--- /dev/null
+++ b/Documentation/devicetree/bindings/spi/spi-bcm63xx.txt
@@ -0,0 +1,33 @@
+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>;
+        };