linux-kernel - Re: [PATCH v1 3/4] usb: dwc3: exynos: Use devm_regulator_bulk_get

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Date: Sat, 2 Mar 2024 16:50:26 +0100
From: Christophe JAILLET <christophe.jaillet@...adoo.fr>
To: Anand Moon <linux.amoon@...il.com>,
 Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
 Alim Akhtar <alim.akhtar@...sung.com>
Cc: linux-usb@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 3/4] usb: dwc3: exynos: Use
 devm_regulator_bulk_get_enable() helper function

Le 01/03/2024 à 20:38, Anand Moon a écrit :
> Use devm_regulator_bulk_get_enable() instead of open coded
> 'devm_regulator_get(), regulator_enable(), regulator_disable().
> 
> Signed-off-by: Anand Moon <linux.amoon@...il.com>
> ---
>   drivers/usb/dwc3/dwc3-exynos.c | 49 +++-------------------------------
>   1 file changed, 4 insertions(+), 45 deletions(-)
> 
> diff --git a/drivers/usb/dwc3/dwc3-exynos.c b/drivers/usb/dwc3/dwc3-exynos.c
> index 5d365ca51771..7c77f3c69825 100644
> --- a/drivers/usb/dwc3/dwc3-exynos.c
> +++ b/drivers/usb/dwc3/dwc3-exynos.c
> @@ -32,9 +32,6 @@ struct dwc3_exynos {
>   	struct clk		*clks[DWC3_EXYNOS_MAX_CLOCKS];
>   	int			num_clks;
>   	int			suspend_clk_idx;
> -
> -	struct regulator	*vdd33;
> -	struct regulator	*vdd10;
>   };
>   
>   static int dwc3_exynos_probe(struct platform_device *pdev)
> @@ -44,6 +41,7 @@ static int dwc3_exynos_probe(struct platform_device *pdev)
>   	struct device_node	*node = dev->of_node;
>   	const struct dwc3_exynos_driverdata *driver_data;
>   	int			i, ret;
> +	static const char * const regulators[] = { "vdd33", "vdd10" };
>   
>   	exynos = devm_kzalloc(dev, sizeof(*exynos), GFP_KERNEL);
>   	if (!exynos)
> @@ -78,27 +76,9 @@ static int dwc3_exynos_probe(struct platform_device *pdev)
>   	if (exynos->suspend_clk_idx >= 0)
>   		clk_prepare_enable(exynos->clks[exynos->suspend_clk_idx]);
>   
> -	exynos->vdd33 = devm_regulator_get(dev, "vdd33");
> -	if (IS_ERR(exynos->vdd33)) {
> -		ret = PTR_ERR(exynos->vdd33);
> -		goto vdd33_err;
> -	}
> -	ret = regulator_enable(exynos->vdd33);
> -	if (ret) {
> -		dev_err(dev, "Failed to enable VDD33 supply\n");
> -		goto vdd33_err;
> -	}
> -
> -	exynos->vdd10 = devm_regulator_get(dev, "vdd10");
> -	if (IS_ERR(exynos->vdd10)) {
> -		ret = PTR_ERR(exynos->vdd10);
> -		goto vdd10_err;
> -	}
> -	ret = regulator_enable(exynos->vdd10);
> -	if (ret) {
> -		dev_err(dev, "Failed to enable VDD10 supply\n");
> -		goto vdd10_err;
> -	}
> +	ret = devm_regulator_bulk_get_enable(dev, ARRAY_SIZE(regulators), regulators);
> +	if (ret)
> +		return dev_err_probe(dev, ret, "Failed to enable regulators\n");
>   
>   	if (node) {
>   		ret = of_platform_populate(node, NULL, NULL, dev);
> @@ -115,10 +95,6 @@ static int dwc3_exynos_probe(struct platform_device *pdev)
>   	return 0;
>   
>   populate_err:
> -	regulator_disable(exynos->vdd10);
> -vdd10_err:
> -	regulator_disable(exynos->vdd33);
> -vdd33_err:
>   	for (i = exynos->num_clks - 1; i >= 0; i--)
>   		clk_disable_unprepare(exynos->clks[i]);
>   
> @@ -140,9 +116,6 @@ static void dwc3_exynos_remove(struct platform_device *pdev)
>   
>   	if (exynos->suspend_clk_idx >= 0)
>   		clk_disable_unprepare(exynos->clks[exynos->suspend_clk_idx]);
> -
> -	regulator_disable(exynos->vdd33);
> -	regulator_disable(exynos->vdd10);
>   }
>   
>   static const struct dwc3_exynos_driverdata exynos5250_drvdata = {
> @@ -196,9 +169,6 @@ static int dwc3_exynos_suspend(struct device *dev)
>   	for (i = exynos->num_clks - 1; i >= 0; i--)
>   		clk_disable_unprepare(exynos->clks[i]);
>   
> -	regulator_disable(exynos->vdd33);
> -	regulator_disable(exynos->vdd10);

Hi,

Same here, I don't think that removing regulator_[en|dis]able from the 
suspend and resume function is correct.

The goal is to stop some hardware when the system is suspended, in order 
to save some power.

Why did you removed it?

CJ

> -
>   	return 0;
>   }
>   
> @@ -207,17 +177,6 @@ static int dwc3_exynos_resume(struct device *dev)
>   	struct dwc3_exynos *exynos = dev_get_drvdata(dev);
>   	int i, ret;
>   
> -	ret = regulator_enable(exynos->vdd33);
> -	if (ret) {
> -		dev_err(dev, "Failed to enable VDD33 supply\n");
> -		return ret;
> -	}
> -	ret = regulator_enable(exynos->vdd10);
> -	if (ret) {
> -		dev_err(dev, "Failed to enable VDD10 supply\n");
> -		return ret;
> -	}
> -
>   	for (i = 0; i < exynos->num_clks; i++) {
>   		ret = clk_prepare_enable(exynos->clks[i]);
>   		if (ret) {