ASoC: zx-tdm: add bindings doc for zte's tdm controller

This patch adds dt-binding documentation for zte's tdm controller.

Signed-off-by: Baoyou Xie <baoyou.xie@linaro.org>
Reviewed-by: Shawn Guo <shawnguo@kernel.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/Documentation/devicetree/bindings/sound/zte,tdm.txt b/Documentation/devicetree/bindings/sound/zte,tdm.txt
new file mode 100644 (file)
index 0000000..2a07ca6
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/zte,tdm.txt
@@ -0,0 +1,30 @@
+ZTE TDM DAI driver
+
+Required properties:
+
+- compatible : should be one of the following.
+       * zte,zx296718-tdm
+- reg : physical base address of the controller and length of memory mapped
+    region.
+- clocks : Pairs of phandle and specifier referencing the controller's clocks.
+- clock-names: "wclk" for the wclk.
+               "pclk" for the pclk.
+-#clock-cells: should be 1.
+- zte,tdm-dma-sysctrl : Reference to the sysctrl controller controlling
+    the dma. includes:
+       phandle of sysctrl.
+       register offset in sysctrl for control dma.
+       mask of the register that be written to sysctrl.
+
+Example:
+
+       tdm: tdm@1487000 {
+               compatible = "zte,zx296718-tdm";
+               reg = <0x01487000 0x1000>;
+               clocks = <&audiocrm AUDIO_TDM_WCLK>, <&audiocrm AUDIO_TDM_PCLK>;
+               clock-names = "wclk", "pclk";
+               #clock-cells = <1>;
+               pinctrl-names = "default";
+               pinctrl-0 = <&tdm_global_pin>;
+               zte,tdm-dma-sysctrl = <&sysctrl 0x10c 4>;
+       };