[PATCH] dt-bindings: exynos: Document #sound-dai-cells property of the HDMI node

[Marek Szyprowski]

Hi Inki,

On 2018-03-08 05:01, Inki Dae wrote:
> Hi Sylwester,
>
> 2018년 03월 08일 02:11에 Sylwester Nawrocki 이(가) 쓴 글:
>> The #sound-dai-cells DT property is required to describe link between
>> the HDMI IP block and the SoC's audio subsystem.
>>
>> Signed-off-by: Sylwester Nawrocki <s.nawrocki at samsung.com>
>> ---
>>   Documentation/devicetree/bindings/display/exynos/exynos_hdmi.txt | 3 +++
>>   1 file changed, 3 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/display/exynos/exynos_hdmi.txt b/Documentation/devicetree/bindings/display/exynos/exynos_hdmi.txt
>> index 8715ff06c457..6b2a526ec586 100644
>> --- a/Documentation/devicetree/bindings/display/exynos/exynos_hdmi.txt
>> +++ b/Documentation/devicetree/bindings/display/exynos/exynos_hdmi.txt
>> @@ -50,6 +50,9 @@ Required properties for Exynos 5433:
>>   - clock-names: aliases for above clock specfiers.
>>   - samsung,sysreg: handle to syscon used to control the system registers.
>>   
>> +Optional properties for Exynos 4210, 4212, 5420 and 5433:
>> + - #sound-dai-cells: should be 0.
>> +
> Just trivial question. 'sound-dai-cells' property could affect hdmi driver? I looked into HDMI codec driver but I didn't find relevat code.
> I mean that if this property never affect HDMI driver then this property would be a dead thing even through this can be declared optionally.

This property is used by ASoC framework when it is building connections
between all elements of the virtual 'sound card'. It allows generic
code to find proper driver for the digital audio interface (DAI) object.

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland