On 16/02/2023 11:41, Claudiu.Beznea@microchip.com wrote:
On 16.02.2023 12:18, Krzysztof Kozlowski wrote:
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On 16/02/2023 11:15, Claudiu.Beznea@microchip.com wrote:
On 16.02.2023 12:04, Krzysztof Kozlowski wrote:
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On 14/02/2023 17:14, Claudiu Beznea wrote:
Add microchip,startup-delay-us binding to let PDMC users to specify startup delay.
Signed-off-by: Claudiu Beznea claudiu.beznea@microchip.com
.../devicetree/bindings/sound/microchip,sama7g5-pdmc.yaml | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/Documentation/devicetree/bindings/sound/microchip,sama7g5-pdmc.yaml b/Documentation/devicetree/bindings/sound/microchip,sama7g5-pdmc.yaml index c4cf1e5ab84b..9b40268537cb 100644 --- a/Documentation/devicetree/bindings/sound/microchip,sama7g5-pdmc.yaml +++ b/Documentation/devicetree/bindings/sound/microchip,sama7g5-pdmc.yaml @@ -67,6 +67,12 @@ properties: maxItems: 4 uniqueItems: true
- microchip,startup-delay-us:
- description: |
Specifies the delay in microseconds that needs to be applied afterenabling the PDMC microphones to avoid unwanted noise due to microphonesnot being ready.Is this some hardware delay? Or OS? If OS, why Linux specific delay is put into DT?
It's the delay used in software workaround that IP needs to filter noises.
Then this sounds like OS? Linux related properties usually do not belong to DT.
The IP is not fully featured to do this kind of filtering on its own thus this software workaround. This delay may depend on used microphones thus for different kind of setups (PDMC + different microphones) I introduced this in DT.
I understand your driver needs delay and I am not questioning this. I am questioning why this is suitable for DT?
Because that delay may depend on the microphones that are used with PDMC. Different boards may come with different microphones, thus the default delay may not fit to fully filter the noise. Due to this I chose to add it in DT.
Ah, ok, that's good explanation. Thank you.
Reviewed-by: Krzysztof Kozlowski krzysztof.kozlowski@linaro.org
Best regards, Krzysztof