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scsi: ufs: Read device tree to find UFS's Vcc voltage level

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This change 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.

Change-Id: Ifc6856d63b672ed6b178f45fd5f139cb2fa56f15
Signed-off-by: Bao D. Nguyen <nguyenb@codeaurora.org>
This commit is contained in:
Bao D. Nguyen 2017-09-11 12:08:26 -07:00
commit 40d7d6b3ab
1 changed files with 12 additions and 3 deletions
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15
drivers/scsi/ufs/ufshcd-pltfrm.c
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@ -129,10 +129,11 @@ out:
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__);
@ -162,8 +163,16 @@ 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;