ASoC: qcom: Document LPASS CPU bindings

Add documentation to the sound directory of the
device-tree bindings for the QTi LPASS CPU DAI
device.

Signed-off-by: Kenneth Westfield <kwestfie@codeaurora.org>
Acked-by: Banajit Goswami <bgoswami@codeaurora.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/Documentation/devicetree/bindings/sound/qcom,lpass-cpu.txt b/Documentation/devicetree/bindings/sound/qcom,lpass-cpu.txt
new file mode 100644 (file)
index 0000000..e7c6e93
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/qcom,lpass-cpu.txt
@@ -0,0 +1,49 @@
+* Qualcomm Technologies LPASS CPU DAI
+
+This node models the Qualcomm Technologies Low-Power Audio SubSystem (LPASS).
+
+Required properties:
+
+- compatible           : "qcom,lpass-cpu"
+- clocks               : Must contain an entry for each entry in clock-names.
+- clock-names          : A list which must include the following entries:
+                               * "ahbix-clk"
+                               * "mi2s-osr-clk"
+                               * "mi2s-bit-clk"
+- interrupts           : Must contain an entry for each entry in
+                         interrupt-names.
+- interrupt-names      : A list which must include the following entries:
+                               * "lpass-irq-lpaif"
+- pinctrl-N            : One property must exist for each entry in
+                         pinctrl-names.  See ../pinctrl/pinctrl-bindings.txt
+                         for details of the property values.
+- pinctrl-names                : Must contain a "default" entry.
+- reg                  : Must contain an address for each entry in reg-names.
+- reg-names            : A list which must include the following entries:
+                               * "lpass-lpaif"
+
+Required subnodes:
+
+- qcom,adsp            : Audio DSP sub-node
+
+Optional Audio DSP subnode properties:
+
+- status               : "disabled" indicates the adsp is not available.
+
+Example:
+
+lpass@28100000 {
+       compatible = "qcom,lpass-cpu";
+       clocks = <&lcc AHBIX_CLK>, <&lcc MI2S_OSR_CLK>, <&lcc MI2S_BIT_CLK>;
+       clock-names = "ahbix-clk", "mi2s-osr-clk", "mi2s-bit-clk";
+       interrupts = <0 85 1>;
+       interrupt-names = "lpass-irq-lpaif";
+       pinctrl-names = "default", "idle";
+       pinctrl-0 = <&mi2s_default>;
+       pinctrl-1 = <&mi2s_idle>;
+       reg = <0x28100000 0x10000>;
+       reg-names = "lpass-lpaif";
+       qcom,adsp {
+               status = "disabled";
+       };
+};