Re: [PATCH 1/2] ASoC: dt-bindings: realtek,rt5677: Add clock property

[Diogo Ivo]

Hi Mark,

On 9/3/26 11:57 AM, Mark Brown wrote:
> On Thu, Sep 03, 2026 at 12:11:00AM +0200, Diogo Ivo wrote:
> > Add a clock property as the RT5677 codec can be fed an
> > external clock signal.
>
> > +  clocks:
> > +    items:
> > +      - description: phandle and clock specifier for codec MCLK.
> > +
> > +  clock-names:
> > +    items:
> > +      - const: mclk
>
> The driver code has a reference to MCLK1 which implies multiple MCLKs,
> unfortunately no pinout seems to be available and other references in
> the driver are just to MCLK so it could be cut'n'paste.

Thanks for raising this point, I had missed it completely. In fact,
looking at rt5677.h there are two places where MCLK2 is mentioned:

#define RT5677_MCLK_SRC_SFT                     10
#define RT5677_MCLK1_SRC                        (0x0 << 10)
#define RT5677_MCLK2_SRC                        (0x1 << 10)

and

#define RT5677_PLL2_PR_SRC_SFT                  15
#define RT5677_PLL2_PR_SRC_MCLK1                (0x0 << 15)
#define RT5677_PLL2_PR_SRC_MCLK2                (0x1 << 15)

so to me it _looks_ like there are indeed two MCLK inputs, both of which
can drive the MCLK clock and can also be the input of PLL2. However, as
you mentioned I also wasn't able to find the pinout/datasheet and I have
no way of testing this. I think the safest bet here is that I send a v2
where I rename "mclk" to "mclk1" that we know for a fact exists, and
then later on if someone with access to the actual datasheet comes along
and confirms the existence of "mclk2" we can add it to the binding.

Let me know what you think!

Best regards,
Diogo