ALSA: ASoC: add DT bindings for CS4271

Apart from pure matching, the bindings also support setting the the
reset gpio line.

Signed-off-by: Daniel Mack <zonque@gmail.com>
Cc: Alexander Sverdlin <subaparts@yandex.ru>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 36 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/sound/cs4271.txt b/Documentation/devicetree/bindings/sound/cs4271.txt
new file mode 100644
index 000000000000..c81b5fd5a5bc
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/cs4271.txt
@@ -0,0 +1,36 @@
+Cirrus Logic CS4271 DT bindings
+
+This driver supports both the I2C and the SPI bus.
+
+Required properties:
+
+ - compatible: "cirrus,cs4271"
+
+For required properties on SPI, please consult
+Documentation/devicetree/bindings/spi/spi-bus.txt
+
+Required properties on I2C:
+
+ - reg: the i2c address
+
+
+Optional properties:
+
+ - reset-gpio:  a GPIO spec to define which pin is connected to the chip's
+                !RESET pin
+
+Examples:
+
+        codec_i2c: cs4271@10 {
+                compatible = "cirrus,cs4271";
+                reg = <0x10>;
+                reset-gpio = <&gpio 23 0>;
+        };
+
+        codec_spi: cs4271@0 {
+                compatible = "cirrus,cs4271";
+                reg = <0x0>;
+                reset-gpio = <&gpio 23 0>;
+                spi-max-frequency = <6000000>;
+        };
+