Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / Documentation / devicetree / bindings / spi / spi-fsl-dspi.txt

diff --git a/kernel/Documentation/devicetree/bindings/spi/spi-fsl-dspi.txt b/kernel/Documentation/devicetree/bindings/spi/spi-fsl-dspi.txt
new file mode 100644 (file)
index 0000000..70af78a
--- /dev/null
+++ b/kernel/Documentation/devicetree/bindings/spi/spi-fsl-dspi.txt
@@ -0,0 +1,57 @@
+ARM Freescale DSPI controller
+
+Required properties:
+- compatible : "fsl,vf610-dspi"
+- reg : Offset and length of the register set for the device
+- interrupts : Should contain SPI controller interrupt
+- clocks: from common clock binding: handle to dspi clock.
+- clock-names: from common clock binding: Shall be "dspi".
+- pinctrl-0: pin control group to be used for this controller.
+- pinctrl-names: must contain a "default" entry.
+- spi-num-chipselects : the number of the chipselect signals.
+- bus-num : the slave chip chipselect signal number.
+
+Optional property:
+- big-endian: If present the dspi device's registers are implemented
+  in big endian mode, otherwise in native mode(same with CPU), for more
+  detail please see: Documentation/devicetree/bindings/regmap/regmap.txt.
+
+Optional SPI slave node properties:
+- fsl,spi-cs-sck-delay: a delay in nanoseconds between activating chip
+  select and the start of clock signal, at the start of a transfer.
+- fsl,spi-sck-cs-delay: a delay in nanoseconds between stopping the clock
+  signal and deactivating chip select, at the end of a transfer.
+
+Example:
+
+dspi0@4002c000 {
+       #address-cells = <1>;
+       #size-cells = <0>;
+       compatible = "fsl,vf610-dspi";
+       reg = <0x4002c000 0x1000>;
+       interrupts = <0 67 0x04>;
+       clocks = <&clks VF610_CLK_DSPI0>;
+       clock-names = "dspi";
+       spi-num-chipselects = <5>;
+       bus-num = <0>;
+       pinctrl-names = "default";
+       pinctrl-0 = <&pinctrl_dspi0_1>;
+       big-endian;
+       status = "okay";
+
+       sflash: at26df081a@0 {
+               #address-cells = <1>;
+               #size-cells = <1>;
+               compatible = "atmel,at26df081a";
+               spi-max-frequency = <16000000>;
+               spi-cpol;
+               spi-cpha;
+               reg = <0>;
+               linux,modalias = "m25p80";
+               modal = "at26df081a";
+               fsl,spi-cs-sck-delay = <100>;
+               fsl,spi-sck-cs-delay = <50>;
+       };
+};
+
+