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Subject: Re: [PATCH v3 2/4] ASoC: es8316: add clock control of MCLK
To:     Andy Shevchenko <andy.shevchenko@gmail.com>
Cc:     Mark Brown <broonie@kernel.org>,
        David Yang <yangxiaohua@everest-semi.com>,
        Daniel Drake <drake@endlessm.com>,
        Hans de Goede <hdegoede@redhat.com>,
        ALSA Development Mailing List <alsa-devel@alsa-project.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
References: <20190903165322.20791-1-katsuhiro@katsuster.net>
 <20190903165322.20791-2-katsuhiro@katsuster.net>
 <CAHp75Vcm0yus5GpZEttdr_C07gmQXeNJ16gb_TFLUTvGkc164w@mail.gmail.com>
From:   Katsuhiro Suzuki <katsuhiro@katsuster.net>
Message-ID: <23e51463-1d95-59dd-c449-d4245aadcab5@katsuster.net>
Date:   Thu, 5 Sep 2019 00:46:02 +0900
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Hello Andy,

Thank you for reviewing.

On 2019/09/04 23:37, Andy Shevchenko wrote:
> On Tue, Sep 3, 2019 at 7:54 PM Katsuhiro Suzuki <katsuhiro@katsuster.net> wrote:
>>
>> This patch introduce clock property for MCLK master freq control.
>> Driver will set rate of MCLK master if set_sysclk is called and
>> changing sysclk by board driver.
>>
>> Signed-off-by: Katsuhiro Suzuki <katsuhiro@katsuster.net>
> 
> 
>> +       if (es8316->mclk) {
> 
> You don't need this if clock has been requested as optional
> (clk_get_optional() or so).
> 
>> +               ret = clk_set_rate(es8316->mclk, freq);
>> +               if (ret)
>> +                       return ret;
>> +       }
> 
>> +       es8316->mclk = devm_clk_get(component->dev, "mclk");
>> +       if (PTR_ERR(es8316->mclk) == -EPROBE_DEFER)
>> +               return -EPROBE_DEFER;
>> +       if (IS_ERR(es8316->mclk)) {
>> +               dev_err(component->dev, "clock is invalid, ignored\n");
>> +               es8316->mclk = NULL;
>> +       }
> 
> devm_clk_get_optional()
> 
>> +       if (es8316->mclk) {
> 
> Ditto as above.
> 
>> +               ret = clk_prepare_enable(es8316->mclk);
>> +               if (ret) {
>> +                       dev_err(component->dev, "unable to enable clock\n");
>> +                       return ret;
>> +               }
>> +       }
> 
>> +       if (es8316->mclk)
> 
> Ditto.
> 
>> +               clk_disable_unprepare(es8316->mclk);
>> +}
> 
> 

Indeed, NULL check of MCLK is not needed.
I'll make and send fixup patch.

Best Regards,
Katsuhiro Suzuki