From: Kenneth Westfield <kwestfie@xxxxxxxxxxxxxx>
Add documentation to the sound directory of the
device-tree bindings for the IPQ806x LPASS CPU DAI
device.
Signed-off-by: Kenneth Westfield <kwestfie@xxxxxxxxxxxxxx>
Acked-by: Banajit Goswami <bgoswami@xxxxxxxxxxxxxx>
---
.../devicetree/bindings/sound/qcom,lpass-cpu.txt | 66 ++++++++++++++++++++++
1 file changed, 66 insertions(+)
create mode 100644 Documentation/devicetree/bindings/sound/qcom,lpass-cpu.txt
diff --git a/Documentation/devicetree/bindings/sound/qcom,lpass-cpu.txt b/Documentation/devicetree/bindings/sound/qcom,lpass-cpu.txt
new file mode 100644
index 0000000000000000000000000000000000000000..7406ae52aec196f136883eb01afbc6c425bdc465
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/qcom,lpass-cpu.txt
@@ -0,0 +1,66 @@
+* Qualcomm Technologies LPASS CPU DAI
+
+This node models the Qualcomm Technologies LPASS DAI ports.
+
+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"
+ * "lpass-lpm"
+
+Optional properties:
+
+- qcom,system-clock-shift : Add this bool property if the default
+ frequency of the system clock needs to
+ be reduced.
+- qcom,system-clock-shift-compare : A numerical value used to right-shift
+ the default system clock frequency for
+ comparison with the target bit clock
+ frequency.
+- qcom,system-clock-shift-amount : A numerical value used to right-shift
+ the default system clock frequency.
+- qcom,alternate-sysclk : Add this bool property if the default
+ frequency of the system clock cannot
+ divide down to the target bit clock
+ frequency.
+- qcom,alternate-sysclk-bitwidth : A numerical value representing the
+ sample bitwidth which requires use of
+ the alternate system clock frequency.
+- qcom,alternate-sysclk-frequency : A numerical value representing the new
+ system clock frequency to use.
+
+Example:
+
+lpass-cpu@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>, <0x28400000 0x4000>;
+ reg-names = "lpass-lpaif", "lpass-lpm";
+ qcom,system-clock-shift;
+ qcom,system-clock-shift-compare = <4>;
+ qcom,system-clock-shift-amount = <3>;
+ qcom,alternate-sysclk;
+ qcom,alternate-systclk-bitwidth = <24>;
+ qcom,alternate-systclk-frequency = <4608000>;
+};
--
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