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

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Date:   Tue, 15 Mar 2022 11:57:20 -0500
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Srinivasa Rao Mandadapu <quic_srivasam@...cinc.com>
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 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.

> 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;

> +	} 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;

>  
>  	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.

>  };
>  
>  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

Regards,
Bjorn

>  };
>  
>  static const struct of_device_id lpi_pinctrl_of_match[] = {
> -- 
> 2.7.4
>