The sii902x chip family supports also HDMI audio. Add binding for
describing the necessary i2s and mclk wiring for it.
Signed-off-by: Jyri Sarha <jsarha@xxxxxx>
---
.../bindings/display/bridge/sii902x.txt | 41 +++++++++++++++++++
1 file changed, 41 insertions(+)
diff --git a/Documentation/devicetree/bindings/display/bridge/sii902x.txt b/Documentation/devicetree/bindings/display/bridge/sii902x.txt
index c4c1855ca654..b5168a0e3a2b 100644
--- a/Documentation/devicetree/bindings/display/bridge/sii902x.txt
+++ b/Documentation/devicetree/bindings/display/bridge/sii902x.txt
@@ -9,6 +9,41 @@ Optional properties:
about hotplug events.
- reset-gpios: OF device-tree gpio specification for RST_N pin.
+ HDMI audio properties:
+ - #sound-dai-cells: <0> or <1>. <0> if only i2s or spdif pin
+ is wired, <1> if the both are wired. HDMI audio is
+ configured only if this property is found.
+ - sil,i2s-data-lanes: Array of up to 4 integers with values of 0-3
+ Each integer indicates which i2s pin is connected to which
+ audio fifo. The first integer selects i2s audio pin for the
+ first audio fifo#0 (HDMI channels 1&2), second for fifo#1
+ (HDMI channels 3&4), and so on. There is 4 fifos and 4 i2s
+ pins (SD0 - SD3). Any i2s pin can be connected to any fifo,
+ but there can be no gaps. E.g. an i2s pin must be mapped to
+ fifo#0 and fifo#1 before mapping a channel to fifo#2. Default
+ value is <0>, describing SD0 pin beiging routed to hdmi audio
+ fifo #0.
+ - clocks: phandle and clock specifier for each clock listed in
+ the clock-names property
+ - clock-names: "mclk"
+ Describes SII902x MCLK input. MCLK is used to produce
+ HDMI audio CTS values. This property is required if
+ "#sound-dai-cells"-property is present. This property follows
+ Documentation/devicetree/bindings/clock/clock-bindings.txt
+ consumer binding.
+
+ If HDMI audio is configured the sii902x device becomes an I2S
+ and/or spdif audio codec component (e.g a digital audio sink),
+ that can be used in configuring a full audio devices with
+ simple-card or audio-graph-card binding. See their binding
+ documents on how to describe the way the sii902x device is
+ connected to the rest of the audio system:
+ Documentation/devicetree/bindings/sound/simple-card.txt
+ Documentation/devicetree/bindings/sound/audio-graph-card.txt
+ Note: In case of the audio-graph-card binding the used port
+ index should be 3 or higher to avoid conflict with video ports
+ (see bellow).
+
Optional subnodes:
- video input: this subnode can contain a video input port node
to connect the bridge to a display controller output (See this
@@ -21,6 +56,12 @@ Example:
compatible = "sil,sii9022";
reg = <0x39>;
reset-gpios = <&pioA 1 0>;
+
+ #sound-dai-cells = <0>;
+ sil,i2s-data-lanes = < 0 1 2 >;
+ clocks = <&mclk>;
+ clock-names = "mclk";
+
ports {
#address-cells = <1>;
#size-cells = <0>;
--
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