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dt-bindings: display: sii902x: Add HDMI audio bindings

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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@ti.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Link: https://patchwork.freedesktop.org/patch/msgid/f790277fabc45f987f90075dd842368705226a84.1558964241.git.jsarha@ti.com
This commit is contained in:
Jyri Sarha 2019-05-27 16:47:56 +03:00 committed by Andrzej Hajda
parent 9ed99f613f
commit 3f18021f43
1 changed files with 40 additions and 0 deletions
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40
Documentation/devicetree/bindings/display/bridge/sii902x.txt
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@ -9,6 +9,40 @@ 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.
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 +55,12 @@ 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>;