linux-kernel - Re: [PATCH v11 7/7] pinctrl: qcom: Update clock voting as optional

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Message-ID: <61fcca7d-983d-7f87-2ca2-e68dea7bc0b4@quicinc.com>
Date:   Wed, 16 Mar 2022 21:18:31 +0530
From:   Srinivasa Rao Mandadapu <quic_srivasam@...cinc.com>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
CC:     <agross@...nel.org>, <lgirdwood@...il.com>, <broonie@...nel.org>,
        <robh+dt@...nel.org>, <quic_plai@...cinc.com>,
        <bgoswami@...eaurora.org>, <perex@...ex.cz>, <tiwai@...e.com>,
        <srinivas.kandagatla@...aro.org>, <rohitkr@...eaurora.org>,
        <linux-arm-msm@...r.kernel.org>, <alsa-devel@...a-project.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <swboyd@...omium.org>, <judyhsiao@...omium.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        <linux-gpio@...r.kernel.org>,
        Venkata Prasad Potturu <quic_potturu@...cinc.com>
Subject: Re: [PATCH v11 7/7] pinctrl: qcom: Update clock voting as optional


On 3/15/2022 10:27 PM, Bjorn Andersson wrote:
Thanks for your time Bjorn!!!
> On Tue 15 Mar 10:50 CDT 2022, Srinivasa Rao Mandadapu wrote:
>
>> Update bulk clock voting to optional voting as ADSP bypass platform doesn't
>> need macro and decodec clocks, as these macro and dcodec GDSC switches are
>> maintained as power domains and operated from lpass clock drivers.
>>
> Sorry for missing your reply on my question on the previous version, I
> think this sounds reasonable.
Okay. Thanks!!!
>
>> Signed-off-by: Srinivasa Rao Mandadapu <quic_srivasam@...cinc.com>
>> Co-developed-by: Venkata Prasad Potturu <quic_potturu@...cinc.com>
>> Signed-off-by: Venkata Prasad Potturu <quic_potturu@...cinc.com>
>> ---
>>   drivers/pinctrl/qcom/pinctrl-lpass-lpi.c        | 12 +++++++++---
>>   drivers/pinctrl/qcom/pinctrl-lpass-lpi.h        |  1 +
>>   drivers/pinctrl/qcom/pinctrl-sc7280-lpass-lpi.c |  1 +
>>   3 files changed, 11 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/pinctrl/qcom/pinctrl-lpass-lpi.c b/drivers/pinctrl/qcom/pinctrl-lpass-lpi.c
>> index 0216ca1..3fc473a 100644
>> --- a/drivers/pinctrl/qcom/pinctrl-lpass-lpi.c
>> +++ b/drivers/pinctrl/qcom/pinctrl-lpass-lpi.c
>> @@ -401,9 +401,15 @@ int lpi_pinctrl_probe(struct platform_device *pdev)
>>   		return dev_err_probe(dev, PTR_ERR(pctrl->slew_base),
>>   				     "Slew resource not provided\n");
>>   
>> -	ret = devm_clk_bulk_get(dev, MAX_LPI_NUM_CLKS, pctrl->clks);
>> -	if (ret)
>> -		return dev_err_probe(dev, ret, "Can't get clocks\n");
>> +	if (data->is_clk_optional) {
>> +		ret = devm_clk_bulk_get_optional(dev, MAX_LPI_NUM_CLKS, pctrl->clks);
>> +		if (ret)
>> +			return dev_err_probe(dev, ret, "Can't get clocks\n");
> Dug into the clk_bulk_get() functions, and __clk_bulk_get() will print
> an error telling you which clock it failed to get. So I don't think your
> more generic error here doesn't add any value.
>
> Just return ret;
Okay will change accordingly.
>
>> +	} else {
>> +		ret = devm_clk_bulk_get(dev, MAX_LPI_NUM_CLKS, pctrl->clks);
>> +		if (ret)
>> +			return dev_err_probe(dev, ret, "Can't get clocks\n");
>> +	}
> Depending on your taste, you could do:
>
> 	if (data->is_clk_optional)
> 		ret = devm_clk_bulk_get_optional();
> 	else
> 		ret = devm_clk_bulk_get();
>
> 	if (ret)
> 		return ret;
Okay. Will change accordingly.
>>   
>>   	ret = clk_bulk_prepare_enable(MAX_LPI_NUM_CLKS, pctrl->clks);
>>   	if (ret)
>> diff --git a/drivers/pinctrl/qcom/pinctrl-lpass-lpi.h b/drivers/pinctrl/qcom/pinctrl-lpass-lpi.h
>> index afbac2a..3bcede6 100644
>> --- a/drivers/pinctrl/qcom/pinctrl-lpass-lpi.h
>> +++ b/drivers/pinctrl/qcom/pinctrl-lpass-lpi.h
>> @@ -77,6 +77,7 @@ struct lpi_pinctrl_variant_data {
>>   	int ngroups;
>>   	const struct lpi_function *functions;
>>   	int nfunctions;
>> +	int is_clk_optional;
> bool here please.
Okay. Will update.
>
>>   };
>>   
>>   int lpi_pinctrl_probe(struct platform_device *pdev);
>> diff --git a/drivers/pinctrl/qcom/pinctrl-sc7280-lpass-lpi.c b/drivers/pinctrl/qcom/pinctrl-sc7280-lpass-lpi.c
>> index d67ff25..304d8a2 100644
>> --- a/drivers/pinctrl/qcom/pinctrl-sc7280-lpass-lpi.c
>> +++ b/drivers/pinctrl/qcom/pinctrl-sc7280-lpass-lpi.c
>> @@ -142,6 +142,7 @@ static const struct lpi_pinctrl_variant_data sc7280_lpi_data = {
>>   	.ngroups = ARRAY_SIZE(sc7280_groups),
>>   	.functions = sc7280_functions,
>>   	.nfunctions = ARRAY_SIZE(sc7280_functions),
>> +	.is_clk_optional = 1,
> true
Okay.
>
> Regards,
> Bjorn
>
>>   };
>>   
>>   static const struct of_device_id lpi_pinctrl_of_match[] = {
>> -- 
>> 2.7.4
>>