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 08:50:10 +0000
From:   Ben Dooks <ben.dooks@...ethink.co.uk>
To:     Dmitry Osipenko <digetx@...il.com>,
        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

On 24/01/2020 04:34, Dmitry Osipenko wrote:
> 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?

This reminds me I still have patches for support for tegra30 as clock
slave. I should really sort out getting these finished up and tested.


-- 
Ben Dooks				http://www.codethink.co.uk/
Senior Engineer				Codethink - Providing Genius

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