linux-kernel - RE: [PATCH v1 2/2] scsi: ufs: Support reading UFS's Vcc voltage from device tree

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Date:   Sun, 13 Sep 2020 09:37:47 +0000
From:   Avri Altman <Avri.Altman@....com>
To:     "Bao D. Nguyen" <nguyenb@...eaurora.org>,
        "cang@...eaurora.org" <cang@...eaurora.org>,
        "asutoshd@...eaurora.org" <asutoshd@...eaurora.org>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>
CC:     "linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        YueHaibing <yuehaibing@...wei.com>,
        Bean Huo <beanhuo@...ron.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v1 2/2] scsi: ufs: Support reading UFS's Vcc voltage from
 device tree

 
> 
> The UFS specifications supports a range of Vcc operating voltage
> from 2.4-3.6V depending on the device and manufacturers.
> Allows selecting the UFS Vcc voltage level by setting the
> UFS's entry vcc-voltage-level in the device tree. If UFS's
> vcc-voltage-level setting is not found in the device tree,
> use default values provided by the driver.
> 
> Signed-off-by: Can Guo <cang@...eaurora.org>
> Signed-off-by: Asutosh Das <asutoshd@...eaurora.org>
> Signed-off-by: Bao D. Nguyen <nguyenb@...eaurora.org>
> ---
>  drivers/scsi/ufs/ufshcd-pltfrm.c | 15 ++++++++++++---
>  1 file changed, 12 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/scsi/ufs/ufshcd-pltfrm.c b/drivers/scsi/ufs/ufshcd-pltfrm.c
> index 3db0af6..48f429c 100644
> --- a/drivers/scsi/ufs/ufshcd-pltfrm.c
> +++ b/drivers/scsi/ufs/ufshcd-pltfrm.c
> @@ -104,10 +104,11 @@ static int ufshcd_parse_clock_info(struct ufs_hba
> *hba)
>  static int ufshcd_populate_vreg(struct device *dev, const char *name,
>                 struct ufs_vreg **out_vreg)
>  {
> -       int ret = 0;
> +       int len, ret = 0;
>         char prop_name[MAX_PROP_SIZE];
>         struct ufs_vreg *vreg = NULL;
>         struct device_node *np = dev->of_node;
> +       const __be32 *prop;
> 
>         if (!np) {
>                 dev_err(dev, "%s: non DT initialization\n", __func__);
> @@ -138,8 +139,16 @@ static int ufshcd_populate_vreg(struct device *dev,
> const char *name,
>                         vreg->min_uV = UFS_VREG_VCC_1P8_MIN_UV;
>                         vreg->max_uV = UFS_VREG_VCC_1P8_MAX_UV;
>                 } else {
> -                       vreg->min_uV = UFS_VREG_VCC_MIN_UV;
> -                       vreg->max_uV = UFS_VREG_VCC_MAX_UV;
> +                       prop = of_get_property(np, "vcc-voltage-level", &len);
> +                       if (!prop || (len != (2 * sizeof(__be32)))) {
> +                               dev_warn(dev, "%s vcc-voltage-level property.\n",
> +                                       prop ? "invalid format" : "no");
> +                               vreg->min_uV = UFS_VREG_VCC_MIN_UV;
> +                               vreg->max_uV = UFS_VREG_VCC_MAX_UV;
> +                       } else {
> +                               vreg->min_uV = be32_to_cpup(&prop[0]);
> +                               vreg->max_uV = be32_to_cpup(&prop[1]);
> +                       }
>                 }
>         } else if (!strcmp(name, "vccq")) {
>                 vreg->min_uV = UFS_VREG_VCCQ_MIN_UV;
> --
Maybe instead call ufshcd_populate_vreg with the new name,
To not break the function flow, and just add another else if ?