linux-kernel - Re: [PATCH v8 22/22] clk: tegra: Remove audio clocks configuration from clock driver

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Date:   Fri, 24 Jan 2020 07:34:24 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Sowjanya Komatineni <skomatineni@...dia.com>,
        thierry.reding@...il.com, jonathanh@...dia.com, broonie@...nel.org,
        lgirdwood@...il.com, perex@...ex.cz, tiwai@...e.com,
        mperttunen@...dia.com, gregkh@...uxfoundation.org,
        sboyd@...nel.org, robh+dt@...nel.org, mark.rutland@....com
Cc:     pdeschrijver@...dia.com, pgaikwad@...dia.com, spujar@...dia.com,
        josephl@...dia.com, daniel.lezcano@...aro.org,
        mmaddireddy@...dia.com, markz@...dia.com,
        devicetree@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8 22/22] clk: tegra: Remove audio clocks configuration
 from clock driver

21.01.2020 19:57, Dmitry Osipenko пишет:
> 21.01.2020 19:19, Sowjanya Komatineni пишет:
>>
>> On 1/19/20 7:04 AM, Dmitry Osipenko wrote:
>>> External email: Use caution opening links or attachments
>>>
>>>
>>> 14.01.2020 10:24, Sowjanya Komatineni пишет:
>>>
>>> [snip]
>>>
>>>> diff --git a/drivers/clk/tegra/clk-tegra30.c
>>>> b/drivers/clk/tegra/clk-tegra30.c
>>>> index 5732fdbe20db..53d1c48532ae 100644
>>>> --- a/drivers/clk/tegra/clk-tegra30.c
>>>> +++ b/drivers/clk/tegra/clk-tegra30.c
>>>> @@ -1221,9 +1221,8 @@ static struct tegra_clk_init_table init_table[]
>>>> __initdata = {
>>>>        { TEGRA30_CLK_UARTC, TEGRA30_CLK_PLL_P, 408000000, 0 },
>>>>        { TEGRA30_CLK_UARTD, TEGRA30_CLK_PLL_P, 408000000, 0 },
>>>>        { TEGRA30_CLK_UARTE, TEGRA30_CLK_PLL_P, 408000000, 0 },
>>>> -     { TEGRA30_CLK_PLL_A, TEGRA30_CLK_CLK_MAX, 564480000, 1 },
>>>> -     { TEGRA30_CLK_PLL_A_OUT0, TEGRA30_CLK_CLK_MAX, 11289600, 1 },
>>>> -     { TEGRA30_CLK_EXTERN1, TEGRA30_CLK_PLL_A_OUT0, 0, 1 },
>>>> +     { TEGRA30_CLK_PLL_A, TEGRA30_CLK_CLK_MAX, 564480000, 0 },
>>>> +     { TEGRA30_CLK_PLL_A_OUT0, TEGRA30_CLK_CLK_MAX, 11289600, 0 },
>>>>        { TEGRA30_CLK_I2S0, TEGRA30_CLK_PLL_A_OUT0, 11289600, 0 },
>>>>        { TEGRA30_CLK_I2S1, TEGRA30_CLK_PLL_A_OUT0, 11289600, 0 },
>>>>        { TEGRA30_CLK_I2S2, TEGRA30_CLK_PLL_A_OUT0, 11289600, 0 },
>>>>
>>> What about to use the assigned-clock-rates in device-tree and thus to
>>> remove those PLL_A entries?
>>
>> Yes clock rates can be used and also PLL rate is set based on sample
>> rate during hw_params. So this can be removed.
>>
>> But PLLA clock rates are not related to this patch series and also
>> changing this needs audio function testing across all platforms and
>> currently we don't have audio functional tests in place for older
>> platforms.
>>
>> All audio clocks proper fixes and cleanup b/w clock driver and audio
>> driver will be done separately.
> 
> If there are real plans to make sound driver to drive the PLLA rate,
> then indeed should be fine to keep it as-is for now.

Looking at tegra_asoc_utils_set_rate(), it already sets the PLLA rate.
Maybe those table entries are not needed already?