[PATCH] arm64: dts: imx8mm: Add support for micfil

[Krzysztof Kozlowski]

On Wed, Oct 28, 2020 at 07:10:37AM -0500, Adam Ford wrote:
> On Tue, May 19, 2020 at 8:03 PM Shawn Guo <shawnguo at kernel.org> wrote:
> >
> > On Sat, May 02, 2020 at 07:59:48AM -0500, Adam Ford wrote:
> > > The i.MX8M Mini has supports the MICFIL digital interface.
> > > It's a 16-bit audio signal from a PDM microphone bitstream.
> > > The driver is already in the kernel, but the node is missing.
> > >
> > > This patch adds the micfil node.
> > >
> > > Signed-off-by: Adam Ford <aford173 at gmail.com>
> > >
> > > diff --git a/arch/arm64/boot/dts/freescale/imx8mm.dtsi b/arch/arm64/boot/dts/freescale/imx8mm.dtsi
> > > index c63685ae80ee..d46e727fc362 100644
> > > --- a/arch/arm64/boot/dts/freescale/imx8mm.dtsi
> > > +++ b/arch/arm64/boot/dts/freescale/imx8mm.dtsi
> > > @@ -339,6 +339,25 @@ sai6: sai at 30060000 {
> > >                               status = "disabled";
> > >                       };
> > >
> > > +                     micfil: micfil at 30080000 {
> >
> > Find a generic node name, audio-controller maybe?
> 
> The SAI's nodes are called SAI at xxxx
> 
> If that's a deal-breaker, I can push a V3.
> 
> I didn't see anyone from the device tree side comment, and the device
> tree binding doc states 'micfil at xxxxxx' so I used what was documented
> in the fsl,micfil.txt

Hi,

The example in the binding is not a binding itself. It can be misleading
or even incorrect and it is not a reason to use such in DTS.

Could be also audio-codec but it is not accurate (as it is only from the
microphone to digital).

Shawn's proposal is the best, I think.

Best regards,
Krzysztof