linux-kernel - Re: [PATCH v6 7/7] pinctrl: qcom: Update clock voting as optional

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Message-ID: <a209336a-9108-f1ac-ee6d-a838df115c6d@linaro.org>
Date:   Wed, 16 Feb 2022 14:20:03 +0000
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     Srinivasa Rao Mandadapu <quic_srivasam@...cinc.com>,
        agross@...nel.org, bjorn.andersson@...aro.org, lgirdwood@...il.com,
        broonie@...nel.org, robh+dt@...nel.org, quic_plai@...cinc.com,
        bgoswami@...eaurora.org, perex@...ex.cz, tiwai@...e.com,
        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
Cc:     Venkata Prasad Potturu <quic_potturu@...cinc.com>
Subject: Re: [PATCH v6 7/7] pinctrl: qcom: Update clock voting as optional



On 14/02/2022 15:19, Srinivasa Rao Mandadapu wrote:
> Update bulk clock voting to optional voting as ADSP bypass platform doesn't
> need macro and decodec clocks, these are maintained as power domains and
> operated from lpass audio core cc.
> 
> 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        | 16 +++++++++-------
>   drivers/pinctrl/qcom/pinctrl-lpass-lpi.h        |  1 +
>   drivers/pinctrl/qcom/pinctrl-sc7280-lpass-lpi.c |  1 +
>   3 files changed, 11 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/pinctrl/qcom/pinctrl-lpass-lpi.c b/drivers/pinctrl/qcom/pinctrl-lpass-lpi.c
> index 8a82fd9..103f0a6c 100644
> --- a/drivers/pinctrl/qcom/pinctrl-lpass-lpi.c
> +++ b/drivers/pinctrl/qcom/pinctrl-lpass-lpi.c
> @@ -407,13 +407,15 @@ 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");
> -
> -	ret = clk_bulk_prepare_enable(MAX_LPI_NUM_CLKS, pctrl->clks);
> -	if (ret)
> -		return dev_err_probe(dev, ret, "Can't enable clocks\n");
> +	if (!data->is_clk_optional) {
> +		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");
> +
> +		ret = clk_bulk_prepare_enable(MAX_LPI_NUM_CLKS, pctrl->clks);
> +		if (ret)
> +			return dev_err_probe(dev, ret, "Can't enable clocks\n");
> +	}
>   
>   	pctrl->desc.pctlops = &lpi_gpio_pinctrl_ops;
>   	pctrl->desc.pmxops = &lpi_gpio_pinmux_ops;
> diff --git a/drivers/pinctrl/qcom/pinctrl-lpass-lpi.h b/drivers/pinctrl/qcom/pinctrl-lpass-lpi.h
> index a511d72..c1079bf 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;
>   };
>   
>   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 5bf30d97..4277e31 100644
> --- a/drivers/pinctrl/qcom/pinctrl-sc7280-lpass-lpi.c
> +++ b/drivers/pinctrl/qcom/pinctrl-sc7280-lpass-lpi.c
> @@ -143,6 +143,7 @@ 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,

This is forcefully set assuming that sc7280 is always used in ADSP 
bypass mode. Which is not correct.

Can't you use devm_clk_bulk_get_optional instead?

--srini

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