spi: st: Provide Device Tree binding documentation

This patch adds DT documentation for the SPI portion of ST's SSC device.

Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 40 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/spi/spi-st-ssc.txt b/Documentation/devicetree/bindings/spi/spi-st-ssc.txt
new file mode 100644
index 000000000000..fe54959ec957
--- /dev/null
+++ b/Documentation/devicetree/bindings/spi/spi-st-ssc.txt
@@ -0,0 +1,40 @@
+STMicroelectronics SSC (SPI) Controller
+---------------------------------------
+
+Required properties:
+- compatible    : "st,comms-ssc4-spi"
+- reg           : Offset and length of the device's register set
+- interrupts    : The interrupt specifier
+- clock-names   : Must contain "ssc"
+- clocks        : Must contain an entry for each name in clock-names
+                    See ../clk/*
+- pinctrl-names : Uses "default", can use "sleep" if provided
+                    See ../pinctrl/pinctrl-binding.txt
+
+Optional properties:
+- cs-gpios      : List of GPIO chip selects
+                    See ../spi/spi-bus.txt
+
+Child nodes represent devices on the SPI bus
+  See ../spi/spi-bus.txt
+
+Example:
+        spi@9840000 {
+                compatible      = "st,comms-ssc4-spi";
+                reg             = <0x9840000 0x110>;
+                interrupts      = <GIC_SPI 112 IRQ_TYPE_LEVEL_HIGH>;
+                clocks          = <&clk_s_c0_flexgen CLK_EXT2F_A9>;
+                clock-names     = "ssc";
+                pinctrl-0       = <&pinctrl_spi0_default>;
+                pinctrl-names   = "default";
+                cs-gpios        = <&pio17 5 0>;
+                #address-cells  = <1>;
+                #size-cells     = <0>;
+
+                st95hf@0{
+                        compatible              = "st,st95hf";
+                        reg                     = <0>;
+                        spi-max-frequency       = <1000000>;
+                        interrupts              = <2 IRQ_TYPE_EDGE_FALLING>;
+                };
+        };