linux-kernel - Re: [PATCH 03/16] soc: imx: gpcv2: switch to clk_bulk

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Message-ID: <a3d75d88-421b-b10b-c16e-d46b77078a53@kontron.de>
Date:   Mon, 3 May 2021 15:37:35 +0200
From:   Frieder Schrempf <frieder.schrempf@...tron.de>
To:     "Peng Fan (OSS)" <peng.fan@....nxp.com>, robh+dt@...nel.org,
        shawnguo@...nel.org, s.hauer@...gutronix.de
Cc:     kernel@...gutronix.de, festevam@...il.com, linux-imx@....com,
        p.zabel@...gutronix.de, l.stach@...gutronix.de, krzk@...nel.org,
        agx@...xcpu.org, marex@...x.de, andrew.smirnov@...il.com,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, ping.bai@....com, aford173@...il.com,
        abel.vesa@....com
Subject: Re: [PATCH 03/16] soc: imx: gpcv2: switch to clk_bulk_* API

On 29.04.21 09:30, Peng Fan (OSS) wrote:
> From: Lucas Stach <l.stach@...gutronix.de>
> 
> Use clk_bulk API to simplify the code a bit. Also add some error
> checking to the clk_prepare_enable calls.
> 
> Signed-off-by: Lucas Stach <l.stach@...gutronix.de>
> ---
>   drivers/soc/imx/gpcv2.c | 60 +++++++++--------------------------------
>   1 file changed, 12 insertions(+), 48 deletions(-)
> 
> diff --git a/drivers/soc/imx/gpcv2.c b/drivers/soc/imx/gpcv2.c
> index 552d3e6bee52..1d90c7802972 100644
> --- a/drivers/soc/imx/gpcv2.c
> +++ b/drivers/soc/imx/gpcv2.c
> @@ -100,13 +100,11 @@
>   
>   #define GPC_PGC_CTRL_PCR		BIT(0)
>   
> -#define GPC_CLK_MAX		6
> -
>   struct imx_pgc_domain {
>   	struct generic_pm_domain genpd;
>   	struct regmap *regmap;
>   	struct regulator *regulator;
> -	struct clk *clk[GPC_CLK_MAX];
> +	struct clk_bulk_data *clks;
>   	int num_clks;
>   
>   	unsigned int pgc;
> @@ -149,8 +147,12 @@ static int imx_gpc_pu_pgc_sw_pxx_req(struct generic_pm_domain *genpd,
>   	}
>   
>   	/* Enable reset clocks for all devices in the domain */
> -	for (i = 0; i < domain->num_clks; i++)
> -		clk_prepare_enable(domain->clk[i]);
> +	clk_bulk_prepare_enable(domain->num_clks, domain->clks);

Looks like this fails to catch the return value. This is fixed in patch 
04/13 but should happen here already. All the rest looks good to me.

> +	if (ret) {
> +		dev_err(domain->dev, "failed to enable reset clocks\n");
> +		regulator_disable(domain->regulator);
> +		return ret;
> +	}
>   
>   	if (enable_power_control)
>   		regmap_update_bits(domain->regmap, GPC_PGC_CTRL(domain->pgc),
> @@ -187,8 +189,7 @@ static int imx_gpc_pu_pgc_sw_pxx_req(struct generic_pm_domain *genpd,
>   				   GPC_PGC_CTRL_PCR, 0);
>   
>   	/* Disable reset clocks for all devices in the domain */
> -	for (i = 0; i < domain->num_clks; i++)
> -		clk_disable_unprepare(domain->clk[i]);
> +	clk_bulk_disable_unprepare(domain->num_clks, domain->clks);
>   
>   	if (has_regulator && !on) {
>   		int err;
> @@ -438,41 +439,6 @@ static const struct imx_pgc_domain_data imx8m_pgc_domain_data = {
>   	.reg_access_table = &imx8m_access_table,
>   };
>   
> -static int imx_pgc_get_clocks(struct imx_pgc_domain *domain)
> -{
> -	int i, ret;
> -
> -	for (i = 0; ; i++) {
> -		struct clk *clk = of_clk_get(domain->dev->of_node, i);
> -		if (IS_ERR(clk))
> -			break;
> -		if (i >= GPC_CLK_MAX) {
> -			dev_err(domain->dev, "more than %d clocks\n",
> -				GPC_CLK_MAX);
> -			ret = -EINVAL;
> -			goto clk_err;
> -		}
> -		domain->clk[i] = clk;
> -	}
> -	domain->num_clks = i;
> -
> -	return 0;
> -
> -clk_err:
> -	while (i--)
> -		clk_put(domain->clk[i]);
> -
> -	return ret;
> -}
> -
> -static void imx_pgc_put_clocks(struct imx_pgc_domain *domain)
> -{
> -	int i;
> -
> -	for (i = domain->num_clks - 1; i >= 0; i--)
> -		clk_put(domain->clk[i]);
> -}
> -
>   static int imx_pgc_domain_probe(struct platform_device *pdev)
>   {
>   	struct imx_pgc_domain *domain = pdev->dev.platform_data;
> @@ -490,9 +456,10 @@ static int imx_pgc_domain_probe(struct platform_device *pdev)
>   				      domain->voltage, domain->voltage);
>   	}
>   
> -	ret = imx_pgc_get_clocks(domain);
> -	if (ret)
> -		return dev_err_probe(domain->dev, ret, "Failed to get domain's clocks\n");
> +	domain->num_clks = devm_clk_bulk_get_all(domain->dev, &domain->clks);
> +	if (domain->num_clks < 0)
> +		return dev_err_probe(domain->dev, domain->num_clks,
> +				     "Failed to get domain's clocks\n");
>   
>   	regmap_update_bits(domain->regmap, GPC_PGC_CPU_MAPPING,
>   			   domain->bits.map, domain->bits.map);
> @@ -517,7 +484,6 @@ static int imx_pgc_domain_probe(struct platform_device *pdev)
>   out_domain_unmap:
>   	regmap_update_bits(domain->regmap, GPC_PGC_CPU_MAPPING,
>   			   domain->bits.map, 0);
> -	imx_pgc_put_clocks(domain);
>   
>   	return ret;
>   }
> @@ -532,8 +498,6 @@ static int imx_pgc_domain_remove(struct platform_device *pdev)
>   	regmap_update_bits(domain->regmap, GPC_PGC_CPU_MAPPING,
>   			   domain->bits.map, 0);
>   
> -	imx_pgc_put_clocks(domain);
> -
>   	return 0;
>   }
>   
>