linux-kernel - Re: [PATCH v7 2/3] clk: qcom: common: Add support for power-domain attachment

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Message-ID: <fca39cde-b9c8-4f1d-a4d0-92a1d739b57f@linaro.org>
Date: Wed, 11 Dec 2024 15:36:49 +0200
From: Vladimir Zapolskiy <vladimir.zapolskiy@...aro.org>
To: Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
 Bjorn Andersson <andersson@...nel.org>,
 Michael Turquette <mturquette@...libre.com>, Stephen Boyd
 <sboyd@...nel.org>, Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc: linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 2/3] clk: qcom: common: Add support for power-domain
 attachment

Hi Bryan,

On 12/11/24 02:27, Bryan O'Donoghue wrote:
> Right now we support one power-domain per clock controller.
> These single power-domains are switched on by the driver platform logic.
> 
> However when we have multiple power-domains attached to a clock-controller
> that list of power-domains must be handled outside of driver platform
> logic.
> 
> Use devm_pm_domain_attach_list() to automatically hook the list of given
> power-domains in the dtsi for the clock-controller driver.
> 
> Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
> ---
>   drivers/clk/qcom/common.c | 9 +++++++++
>   1 file changed, 9 insertions(+)
> 
> diff --git a/drivers/clk/qcom/common.c b/drivers/clk/qcom/common.c
> index 33cc1f73c69d1f875a193aea0552902268dc8716..e6a024e95ab5f4b0776ffc6c7b3bebfbebb007fd 100644
> --- a/drivers/clk/qcom/common.c
> +++ b/drivers/clk/qcom/common.c
> @@ -22,6 +22,7 @@ struct qcom_cc {
>   	struct qcom_reset_controller reset;
>   	struct clk_regmap **rclks;
>   	size_t num_rclks;
> +	struct dev_pm_domain_list *pd_list;
>   };
>   
>   const
> @@ -294,11 +295,19 @@ int qcom_cc_really_probe(struct device *dev,
>   	struct clk_regmap **rclks = desc->clks;
>   	size_t num_clk_hws = desc->num_clk_hws;
>   	struct clk_hw **clk_hws = desc->clk_hws;
> +	struct dev_pm_domain_attach_data pd_data = {
> +		.pd_names = 0,
> +		.num_pd_names = 0,
> +	};

Please remove the added local variable.

>   	cc = devm_kzalloc(dev, sizeof(*cc), GFP_KERNEL);
>   	if (!cc)
>   		return -ENOMEM;
>   
> +	ret = devm_pm_domain_attach_list(dev, &pd_data, &cc->pd_list);

Please simplify it to

	ret = devm_pm_domain_attach_list(dev, NULL, &cc->pd_list);

> +	if (ret < 0 && ret != -EEXIST)
> +		return ret;
> +
>   	reset = &cc->reset;
>   	reset->rcdev.of_node = dev->of_node;
>   	reset->rcdev.ops = &qcom_reset_ops;
> 

--
Best wishes,
Vladimir