On 22/02/2023 12:39, Chancel Liu wrote: > This property specifies power up to audio out time. It's necessary > beacause this device has to wait some time before ready to output audio typo... run spellcheck, also on the subject > after MCLK, BCLK and MUTE=1 are enabled. For more details about the > timing constraints, please refer to WTN0302 on > https://www.cirrus.com/products/wm8524/ > > Signed-off-by: Chancel Liu <chancel.liu@xxxxxxx> > --- > .../devicetree/bindings/sound/wlf,wm8524.yaml | 10 ++++++++++ > 1 file changed, 10 insertions(+) > > diff --git a/Documentation/devicetree/bindings/sound/wlf,wm8524.yaml b/Documentation/devicetree/bindings/sound/wlf,wm8524.yaml > index 09c54cc7de95..54b4da5470e4 100644 > --- a/Documentation/devicetree/bindings/sound/wlf,wm8524.yaml > +++ b/Documentation/devicetree/bindings/sound/wlf,wm8524.yaml > @@ -21,6 +21,15 @@ properties: > description: > a GPIO spec for the MUTE pin. > > + wlf,power-up-delay-ms: > + maximum: 1500 maximum is 1003. Where do you see 1500? minimum: 82 > + default: 100 > + description: > + Power up sequency delay time in millisecond. It specifies power up to typo: sequence? > + audio out time. For more details about the timing constraints of this > + device, please refer to WTN0302 on > + https://www.cirrus.com/products/wm8524/. According to WTN0302 this might or might not include regulator ramp-up-delay. You should clearly indicate which part of it this delay is to not mix up with ramp up. IOW, mention exactly from where the value comes (e.g. Δt POWER UP TO AUDIO OUT TIMING table, depending on sampling clock rate). Otherwise you introduce quite loose property which will be including regulator ramp up in some cases... Best regards, Krzysztof
