spi: Add DT bindings for Synquacer

This patch adds documentation for Device-Tree bindings for the
Socionext Synquacer spi driver.

Signed-off-by: Masahisa Kojima <masahisa.kojima@linaro.org>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/Documentation/devicetree/bindings/spi/spi-synquacer.txt b/Documentation/devicetree/bindings/spi/spi-synquacer.txt
new file mode 100644 (file)
index 0000000..291dfa6
--- /dev/null
+++ b/Documentation/devicetree/bindings/spi/spi-synquacer.txt
@@ -0,0 +1,27 @@
+* Socionext Synquacer HS-SPI bindings
+
+Required Properties:
+- compatible: should be "socionext,synquacer-spi"
+- reg: physical base address of the controller and length of memory mapped
+       region.
+- interrupts: should contain the "spi_rx", "spi_tx" and "spi_fault" interrupts.
+- clocks: core clock iHCLK. Optional rate clock iPCLK (default is iHCLK)
+- clock-names: Shall be "iHCLK" and "iPCLK" respectively
+
+Optional Properties:
+- socionext,use-rtm: boolean, if required to use "retimed clock" for RX
+- socionext,set-aces: boolean, if same active clock edges field to be set.
+
+Example:
+
+       spi0: spi@ff110000 {
+               compatible = "socionext,synquacer-spi";
+               reg = <0xff110000 0x1000>;
+               interrupts = <GIC_SPI 160 IRQ_TYPE_LEVEL_HIGH>,
+                            <GIC_SPI 161 IRQ_TYPE_LEVEL_HIGH>,
+                            <GIC_SPI 162 IRQ_TYPE_LEVEL_HIGH>;
+               clocks = <&clk_hsspi>;
+               clock-names = "iHCLK";
+               socionext,use-rtm;
+               socionext,set-aces;
+       };