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Commit 40d7d6b3 authored by Bao D. Nguyen's avatar Bao D. Nguyen
Browse files

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



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: default avatarBao D. Nguyen <nguyenb@codeaurora.org>
parent 0ea391ba

drivers/scsi/ufs/ufshcd-pltfrm.c

+12 −3
Original line number Diff line number Diff line
@@ -129,10 +129,11 @@ 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__);
@@ -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 {

			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;