linux-kernel - Re: [PATCH 3/5] ASoC: rt5682: clock driver must use the clock provider API

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Date:   Tue, 13 Apr 2021 09:31:56 +0200
From:   Jerome Brunet <jbrunet@...libre.com>
To:     Stephen Boyd <sboyd@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>
Cc:     alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/5] ASoC: rt5682: clock driver must use the clock
 provider API


On Mon 12 Apr 2021 at 22:27, Stephen Boyd <sboyd@...nel.org> wrote:

> Quoting Jerome Brunet (2021-04-10 04:13:54)
>> Clock drivers ops should not the clk API but the clock provider (clk_hw)
>> instead.
>> 
>> Signed-off-by: Jerome Brunet <jbrunet@...libre.com>
>> ---
>>  sound/soc/codecs/rt5682.c | 6 +++---
>>  1 file changed, 3 insertions(+), 3 deletions(-)
>> 
>> diff --git a/sound/soc/codecs/rt5682.c b/sound/soc/codecs/rt5682.c
>> index 0e2a10ed11da..2eee02ac8d49 100644
>> --- a/sound/soc/codecs/rt5682.c
>> +++ b/sound/soc/codecs/rt5682.c
>> @@ -2634,7 +2634,7 @@ static int rt5682_wclk_set_rate(struct clk_hw *hw, unsigned long rate,
>>                 container_of(hw, struct rt5682_priv,
>>                              dai_clks_hw[RT5682_DAI_WCLK_IDX]);
>>         struct snd_soc_component *component = rt5682->component;
>> -       struct clk *parent_clk;
>> +       struct clk_hw *parent_hw;
>>         const char * const clk_name = clk_hw_get_name(hw);
>>         int pre_div;
>>         unsigned int clk_pll2_out;
>> @@ -2649,8 +2649,8 @@ static int rt5682_wclk_set_rate(struct clk_hw *hw, unsigned long rate,
>>          *
>>          * It will set the codec anyway by assuming mclk is 48MHz.
>>          */
>> -       parent_clk = clk_get_parent(hw->clk);
>> -       if (!parent_clk)
>> +       parent_hw = clk_hw_get_parent(hw);
>> +       if (!parent_hw)
>>                 dev_warn(component->dev,
>>                         "Parent mclk of wclk not acquired in driver. Please ensure mclk was provided as %d Hz.\n",
>>                         CLK_PLL2_FIN);
>
> Can this code be removed? I don't know why we care to check if the clk
> has a parent or not.

I'm focusing on removing "hw->clk" where they are - w/o changing too
much what the driver does. I don't have the HW nor the story behind it
and there is about 50 more drivers to be fixed ... thankfully, most are
in drivers/clk/ ;)

Here, at least the clock consummer API is not longer used within a clock
ops, which is not great considering the locking scheme (among other things)