linux-kernel - Re: [PATCH] ASoC: fsl_sai: Correct the clock source for mclk0

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Date:   Thu, 19 Nov 2020 13:28:32 +0800
From:   Shengjiu Wang <shengjiu.wang@...il.com>
To:     Nicolin Chen <nicoleotsuka@...il.com>
Cc:     Shengjiu Wang <shengjiu.wang@....com>, alsa-devel@...a-project.org,
        Timur Tabi <timur@...nel.org>, Xiubo Li <Xiubo.Lee@...il.com>,
        linuxppc-dev@...ts.ozlabs.org, Takashi Iwai <tiwai@...e.com>,
        Mark Brown <broonie@...nel.org>,
        Fabio Estevam <festevam@...il.com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ASoC: fsl_sai: Correct the clock source for mclk0

On Thu, Nov 19, 2020 at 1:02 PM Nicolin Chen <nicoleotsuka@...il.com> wrote:
>
> On Thu, Nov 19, 2020 at 10:29:16AM +0800, Shengjiu Wang wrote:
> > On VF610, mclk0 = bus_clk;
> > On i.MX6SX/6UL/6ULL/7D, mclk0 = mclk1;
> > On i.MX7ULP, mclk0 = bus_clk;
> > On i.MX8QM/8QXP, mclk0 = bus_clk;
> > On i.MX8MQ/8MN/8MM/8MP, mclk0 = bus_clk;
> >
> > So add variable mclk0_mclk1_match in fsl_sai_soc_data To
>
> Not in favor of "mclk0_mclk1_match" as it doesn't sound explicit
> to me. Instead, "mclk0_is_bus_clk" or "mclk0_is_mclk1" might be
> better. Or in case that you foresee some other implementation:
>
> enum {
>         MCLK0_IS_BUS_CLK,
>         MCLK0_IS_MCLK1,
> };
>
> static const struct fsl_sai_soc_data fsl_sai_vf610_data = {
> +       .mclk0_alias = MCLK0_IS_BUS_CLK,
> };

No problem.

But I just find this patch doesn't consider the mqs case.
MCLK0 can't be used for mqs, it needs MCLK1, even
the MCLK0 is same as MCLK1,  MCLK1 need to be
selected for mqs case.

Is there a decent way for this case?

best regards
wang shengjiu