Re: [PATCH] ASoC: fsl-asoc-card: Get "extal" clock rate by clk_get_rate

[Shengjiu Wang]

On Thu, Aug 6, 2020 at 8:39 PM Mark Brown <broonie@xxxxxxxxxx> wrote:
>
> On Thu, Aug 06, 2020 at 03:39:45PM +0800, Shengjiu Wang wrote:
>
> >       } else if (of_node_name_eq(cpu_np, "esai")) {
> > +             struct clk *esai_clk = clk_get(&cpu_pdev->dev, "extal");
> > +
> > +             if (!IS_ERR(esai_clk)) {
> > +                     priv->cpu_priv.sysclk_freq[TX] = clk_get_rate(esai_clk);
> > +                     priv->cpu_priv.sysclk_freq[RX] = clk_get_rate(esai_clk);
> > +                     clk_put(esai_clk);
> > +             }
>
> This should handle probe deferral.  Also if this clock is in use
> shouldn't we be enabling it?  It looks like it's intended to be a
> crystal so it's probably forced on all the time but sometimes there's
> power control for crystals, or perhaps someone might do something
> unusual with the hardware.

Ok, will add handler for probe deferral.

This clock is not a crystal, "extal" clock is for cpu dai, it is from
soc internal PLL. which is enabled by cpu dai, here is just to
get the clock rate.

best regards
wang shengjiu