usb: phy: msm: Vote for corner of VDD CX instead of voltage of VDD CX

New platform uses RBCPR hardware feature, with that voting for
absolute voltage of VDD CX is not required. Hence vote for corner of
VDD CX which uses nominal corner voltage on VDD CX.

Signed-off-by: Ivan T. Ivanov <iivanov@mm-sol.com>
Cc: Mayank Rana <mrana@codeaurora.org>
Signed-off-by: Felipe Balbi <balbi@ti.com>

Documentation/devicetree/bindings/usb/msm-hsusb.txt

@@ -65,6 +65,10 @@ Optional properties:
                 Some platforms may have configuration to allow USB
                 controller work with any of the two HSPHYs present.
 
+- qcom,vdd-levels: This property must be a list of three integer values
+                (no, min, max) where each value represents either a voltage
+                in microvolts or a value corresponding to voltage corner.
+
 Example HSUSB OTG controller device node:
 
     usb@f9a55000 {
@@ -87,4 +91,5 @@ Example HSUSB OTG controller device node:
 
         qcom,otg-control = <1>;
         qcom,phy-init-sequence = < -1 0x63 >;
+        qcom,vdd-levels = <1 5 7>;
 	};

drivers/usb/phy/phy-msm-usb.c

@@ -62,15 +62,22 @@
 
 #define USB_PHY_VDD_DIG_VOL_MIN	1000000 /* uV */
 #define USB_PHY_VDD_DIG_VOL_MAX	1320000 /* uV */
+#define USB_PHY_SUSP_DIG_VOL	500000  /* uV */
+
+enum vdd_levels {
+	VDD_LEVEL_NONE = 0,
+	VDD_LEVEL_MIN,
+	VDD_LEVEL_MAX,
+};
 
 static int msm_hsusb_init_vddcx(struct msm_otg *motg, int init)
 {
 	int ret = 0;
 
 	if (init) {
 		ret = regulator_set_voltage(motg->vddcx,
-				USB_PHY_VDD_DIG_VOL_MIN,
-				USB_PHY_VDD_DIG_VOL_MAX);
+				motg->vdd_levels[VDD_LEVEL_MIN],
+				motg->vdd_levels[VDD_LEVEL_MAX]);
 		if (ret) {
 			dev_err(motg->phy.dev, "Cannot set vddcx voltage\n");
 			return ret;
@@ -81,7 +88,7 @@ static int msm_hsusb_init_vddcx(struct msm_otg *motg, int init)
 			dev_err(motg->phy.dev, "unable to enable hsusb vddcx\n");
 	} else {
 		ret = regulator_set_voltage(motg->vddcx, 0,
-			USB_PHY_VDD_DIG_VOL_MAX);
+				motg->vdd_levels[VDD_LEVEL_MAX]);
 		if (ret)
 			dev_err(motg->phy.dev, "Cannot set vddcx voltage\n");
 		ret = regulator_disable(motg->vddcx);
@@ -435,17 +442,16 @@ static int msm_phy_init(struct usb_phy *phy)
 
 #ifdef CONFIG_PM
 
-#define USB_PHY_SUSP_DIG_VOL  500000
 static int msm_hsusb_config_vddcx(struct msm_otg *motg, int high)
 {
-	int max_vol = USB_PHY_VDD_DIG_VOL_MAX;
+	int max_vol = motg->vdd_levels[VDD_LEVEL_MAX];
 	int min_vol;
 	int ret;
 
 	if (high)
-		min_vol = USB_PHY_VDD_DIG_VOL_MIN;
+		min_vol = motg->vdd_levels[VDD_LEVEL_MIN];
 	else
-		min_vol = USB_PHY_SUSP_DIG_VOL;
+		min_vol = motg->vdd_levels[VDD_LEVEL_NONE];
 
 	ret = regulator_set_voltage(motg->vddcx, min_vol, max_vol);
 	if (ret) {
@@ -1441,7 +1447,7 @@ static int msm_otg_read_dt(struct platform_device *pdev, struct msm_otg *motg)
 	struct device_node *node = pdev->dev.of_node;
 	struct property *prop;
 	int len, ret, words;
-	u32 val;
+	u32 val, tmp[3];
 
 	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
 	if (!pdata)
@@ -1472,6 +1478,19 @@ static int msm_otg_read_dt(struct platform_device *pdev, struct msm_otg *motg)
 	if (!of_property_read_u32(node, "qcom,phy-num", &val) && val < 2)
 		motg->phy_number = val;
 
+	motg->vdd_levels[VDD_LEVEL_NONE] = USB_PHY_SUSP_DIG_VOL;
+	motg->vdd_levels[VDD_LEVEL_MIN] = USB_PHY_VDD_DIG_VOL_MIN;
+	motg->vdd_levels[VDD_LEVEL_MAX] = USB_PHY_VDD_DIG_VOL_MAX;
+
+	if (of_get_property(node, "qcom,vdd-levels", &len) &&
+	    len == sizeof(tmp)) {
+		of_property_read_u32_array(node, "qcom,vdd-levels",
+					   tmp, len / sizeof(*tmp));
+		motg->vdd_levels[VDD_LEVEL_NONE] = tmp[VDD_LEVEL_NONE];
+		motg->vdd_levels[VDD_LEVEL_MIN] = tmp[VDD_LEVEL_MIN];
+		motg->vdd_levels[VDD_LEVEL_MAX] = tmp[VDD_LEVEL_MAX];
+	}
+
 	prop = of_find_property(node, "qcom,phy-init-sequence", &len);
 	if (!prop || !len)
 		return 0;

include/linux/usb/msm_hsusb.h

@@ -169,6 +169,7 @@ struct msm_otg {
 
 	struct reset_control *phy_rst;
 	struct reset_control *link_rst;
+	int vdd_levels[3];
 };
 
 #endif