ASoC: sta32x: add device tree binding.

make the sta32x driver usable with device tree configs.  Code is heavily based
on the sta350 driver.

Signed-off-by: Thomas Niederprüm <niederp@physik.uni-kl.de>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 92 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/sound/st,sta32x.txt b/Documentation/devicetree/bindings/sound/st,sta32x.txt
new file mode 100644
index 000000000000..255de3ae5b2f
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/st,sta32x.txt
@@ -0,0 +1,92 @@
+STA32X audio CODEC
+
+The driver for this device only supports I2C.
+
+Required properties:
+
+  - compatible: "st,sta32x"
+  - reg: the I2C address of the device for I2C
+  - reset-gpios: a GPIO spec for the reset pin. If specified, it will be
+                 deasserted before communication to the codec starts.
+
+  - power-down-gpios: a GPIO spec for the power down pin. If specified,
+                      it will be deasserted before communication to the codec
+                      starts.
+
+  - Vdda-supply: regulator spec, providing 3.3V
+  - Vdd3-supply: regulator spec, providing 3.3V
+  - Vcc-supply: regulator spec, providing 5V - 26V
+
+Optional properties:
+
+  -  st,output-conf: number, Selects the output configuration:
+        0: 2-channel (full-bridge) power, 2-channel data-out
+        1: 2 (half-bridge). 1 (full-bridge) on-board power
+        2: 2 Channel (Full-Bridge) Power, 1 Channel FFX
+        3: 1 Channel Mono-Parallel
+        If parameter is missing, mode 0 will be enabled.
+        This property has to be specified as '/bits/ 8' value.
+
+  -  st,ch1-output-mapping: Channel 1 output mapping
+  -  st,ch2-output-mapping: Channel 2 output mapping
+  -  st,ch3-output-mapping: Channel 3 output mapping
+        0: Channel 1
+        1: Channel 2
+        2: Channel 3
+        If parameter is missing, channel 1 is chosen.
+        This properties have to be specified as '/bits/ 8' values.
+
+  -  st,thermal-warning-recover:
+        If present, thermal warning recovery is enabled.
+
+  -  st,thermal-warning-adjustment:
+        If present, thermal warning adjustment is enabled.
+
+  -  st,fault-detect-recovery:
+        If present, then fault recovery will be enabled.
+
+  -  st,drop-compensation-ns: number
+        Only required for "st,ffx-power-output-mode" ==
+        "variable-drop-compensation".
+        Specifies the drop compensation in nanoseconds.
+        The value must be in the range of 0..300, and only
+        multiples of 20 are allowed. Default is 140ns.
+
+  -  st,max-power-use-mpcc:
+        If present, then MPCC bits are used for MPC coefficients,
+        otherwise standard MPC coefficients are used.
+
+  -  st,max-power-corr:
+        If present, power bridge correction for THD reduction near maximum
+        power output is enabled.
+
+  -  st,am-reduction-mode:
+        If present, FFX mode runs in AM reduction mode, otherwise normal
+        FFX mode is used.
+
+  -  st,odd-pwm-speed-mode:
+        If present, PWM speed mode run on odd speed mode (341.3 kHz) on all
+        channels. If not present, normal PWM spped mode (384 kHz) will be used.
+
+  -  st,invalid-input-detect-mute:
+        If present, automatic invalid input detect mute is enabled.
+
+Example:
+
+codec: sta32x@38 {
+        compatible = "st,sta32x";
+        reg = <0x1c>;
+        reset-gpios = <&gpio1 19 0>;
+        power-down-gpios = <&gpio1 16 0>;
+        st,output-conf = /bits/ 8  <0x3>;       // set output to 2-channel
+                                                // (full-bridge) power,
+                                                // 2-channel data-out
+        st,ch1-output-mapping = /bits/ 8 <0>;   // set channel 1 output ch 1
+        st,ch2-output-mapping = /bits/ 8 <0>;   // set channel 2 output ch 1
+        st,ch3-output-mapping = /bits/ 8 <0>;   // set channel 3 output ch 1
+        st,max-power-correction;                // enables power bridge
+                                                // correction for THD reduction
+                                                // near maximum power output
+        st,invalid-input-detect-mute;           // mute if no valid digital
+                                                // audio signal is provided.
+};