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Subject: Re: [PATCH v7 15/21] ASoC: tegra: Add fallback implementation for
 audio mclk
To:     Sowjanya Komatineni <skomatineni@nvidia.com>,
        <thierry.reding@gmail.com>, <jonathanh@nvidia.com>,
        <broonie@kernel.org>, <lgirdwood@gmail.com>, <perex@perex.cz>,
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From:   Sameer Pujar <spujar@nvidia.com>
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Date:   Wed, 8 Jan 2020 11:58:56 +0530
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On 1/8/2020 11:18 AM, Sowjanya Komatineni wrote:
>
> On 1/7/20 9:34 PM, Sameer Pujar wrote:
>>
>> On 1/8/2020 9:55 AM, Sowjanya Komatineni wrote:
>>> mclk is from clk_out_1 which is part of Tegra PMC block and pmc clocks
>>> are moved to Tegra PMC driver with pmc as clock provider and using pmc
>>> clock ids.
>>>
>>> New device tree uses clk_out_1 from pmc clock provider.
>>>
>>> So, this patch adds implementation for mclk fallback to extern1 when
>>> retrieving mclk returns -ENOENT to be backward compatible of new device
>>> tree with older kernels.
>>>
>>> Tested-by: Dmitry Osipenko <digetx@gmail.com>
>>> Reviewed-by: Dmitry Osipenko <digetx@gmail.com>
>>> Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
>>> ---
>>> =C2=A0 sound/soc/tegra/tegra_asoc_utils.c | 11 ++++++++++-
>>> =C2=A0 1 file changed, 10 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/sound/soc/tegra/tegra_asoc_utils.c=20
>>> b/sound/soc/tegra/tegra_asoc_utils.c
>>> index 9cfebef74870..9a5f81039491 100644
>>> --- a/sound/soc/tegra/tegra_asoc_utils.c
>>> +++ b/sound/soc/tegra/tegra_asoc_utils.c
>>> @@ -183,7 +183,16 @@ int tegra_asoc_utils_init(struct=20
>>> tegra_asoc_utils_data *data,
>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 data->clk_cdev1 =3D devm_clk_get(dev, "m=
clk");
>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 if (IS_ERR(data->clk_cdev1)) {
>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 dev_err(data->de=
v, "Can't retrieve clk cdev1\n");
>>
>> This error print can be moved inside below if, when this actually=20
>> meant to be an error condition.
>>
> Want to show error even if mclk retrieval returns ENOENT to clearly=20
> indicate mclk does not exist along with message of falling back to=20
> extern1.

Yes, but falling back essentially means 'mclk' is not available and=20
fallback print is not an error.
Not a major issue though, you can consider updating. Otherwise LGTM.

>>> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 return PTR_ERR(data->clk_cd=
ev1);
>>> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 if (PTR_ERR(data->clk_cdev1=
) !=3D -ENOENT)
>>> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ret=
urn PTR_ERR(data->clk_cdev1);
>>> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 /* Fall back to extern1 */
>>> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 data->clk_cdev1 =3D devm_cl=
k_get(dev, "extern1");
>>> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 if (IS_ERR(data->clk_cdev1)=
) {
>>> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 dev=
_err(data->dev, "Can't retrieve clk extern1\n");
>>> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ret=
urn PTR_ERR(data->clk_cdev1);
>>> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 }
>>> +
>>> +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 dev_err(data->dev, "Falling=
 back to extern1\n");
>>
>> This can be a info print?
>
>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 }
>>> =C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 /*