linux-kernel - Re: [PATCH 2/4] phy: qcom-ufs: Correct usage of regulator

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Message-ID: <d8a810772a6956f9b4b8c0f85b2dcc2c@codeaurora.org>
Date:   Fri, 20 Jan 2017 01:03:44 +0530
From:   vivek.gautam@...eaurora.org
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Kishon Vijay Abraham I <kishon@...com>,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        Subhash Jadavani <subhashj@...eaurora.org>
Subject: Re: [PATCH 2/4] phy: qcom-ufs: Correct usage of regulator_get()

On 2017-01-19 16:17, Bjorn Andersson wrote:
> When regulator_get() tries to resolve a regulator supply but fail to
> find a matching property in DeviceTree it returns a dummy regulator, if
> a matching supply is specified but unavailable the regulator core will
> return an error.
> 
> Based on this we should not ignore errors upon failing to acquire the
> optional "vddp-ref-clk" supply.
> 
> Cc: Subhash Jadavani <subhashj@...eaurora.org>
> Cc: Vivek Gautam <vivek.gautam@...eaurora.org>
> Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> ---

Yea, we don't need additional flag to indicate optional regulator.
Change looks good.

Reviewed-by: Vivek Gautam <vivek.gautam@...eaurora.org>


Regards
Vivek

>  drivers/phy/phy-qcom-ufs.c | 21 +++++++--------------
>  1 file changed, 7 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/phy/phy-qcom-ufs.c b/drivers/phy/phy-qcom-ufs.c
> index 4d7f3c018223..bbd317158084 100644
> --- a/drivers/phy/phy-qcom-ufs.c
> +++ b/drivers/phy/phy-qcom-ufs.c
> @@ -210,8 +210,9 @@ int ufs_qcom_phy_init_clks(struct ufs_qcom_phy 
> *phy_common)
>  }
>  EXPORT_SYMBOL_GPL(ufs_qcom_phy_init_clks);
> 
> -static int __ufs_qcom_phy_init_vreg(struct device *dev,
> -		struct ufs_qcom_phy_vreg *vreg, const char *name, bool optional)
> +static int ufs_qcom_phy_init_vreg(struct device *dev,
> +				  struct ufs_qcom_phy_vreg *vreg,
> +				  const char *name)
>  {
>  	int err = 0;
> 
> @@ -221,9 +222,7 @@ static int __ufs_qcom_phy_init_vreg(struct device 
> *dev,
>  	vreg->reg = devm_regulator_get(dev, name);
>  	if (IS_ERR(vreg->reg)) {
>  		err = PTR_ERR(vreg->reg);
> -		vreg->reg = NULL;
> -		if (!optional)
> -			dev_err(dev, "failed to get %s, %d\n", name, err);
> +		dev_err(dev, "failed to get %s, %d\n", name, err);
>  		goto out;
>  	}
> 
> @@ -263,12 +262,6 @@ static int __ufs_qcom_phy_init_vreg(struct device 
> *dev,
>  	return err;
>  }
> 
> -static int ufs_qcom_phy_init_vreg(struct device *dev,
> -			struct ufs_qcom_phy_vreg *vreg, const char *name)
> -{
> -	return __ufs_qcom_phy_init_vreg(dev, vreg, name, false);
> -}
> -
>  int ufs_qcom_phy_init_vregulators(struct ufs_qcom_phy *phy_common)
>  {
>  	int err;
> @@ -284,9 +277,9 @@ int ufs_qcom_phy_init_vregulators(struct
> ufs_qcom_phy *phy_common)
>  	if (err)
>  		goto out;
> 
> -	/* vddp-ref-clk-* properties are optional */
> -	__ufs_qcom_phy_init_vreg(phy_common->dev, &phy_common->vddp_ref_clk,
> -				 "vddp-ref-clk", true);
> +	err = ufs_qcom_phy_init_vreg(phy_common->dev, 
> &phy_common->vddp_ref_clk,
> +				     "vddp-ref-clk");
> +
>  out:
>  	return err;
>  }