phy: qcom: phy-qcom-snps-eusb2: Add support for eUSB2 repeater

For USB 2.0 compliance, eUSB2 needs a repeater. The PHY needs to
initialize and reset it. So add repeater support

Co-developed-by: Abel Vesa <abel.vesa@linaro.org>
Signed-off-by: Abel Vesa <abel.vesa@linaro.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20230208190200.2966723-6-abel.vesa@linaro.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>

Author: superna9999

drivers/phy/qualcomm/phy-qcom-snps-eusb2.c

@@ -130,6 +130,8 @@ struct qcom_snps_eusb2_hsphy {
 	struct regulator_bulk_data vregs[EUSB2_NUM_VREGS];
 
 	enum phy_mode mode;
+
+	struct phy *repeater;
 };
 
 static int qcom_snps_eusb2_hsphy_set_mode(struct phy *p, enum phy_mode mode, int submode)
@@ -138,7 +140,7 @@ static int qcom_snps_eusb2_hsphy_set_mode(struct phy *p, enum phy_mode mode, int
 
 	phy->mode = mode;
 
-	return 0;
+	return phy_set_mode_ext(phy->repeater, mode, submode);
 }
 
 static void qcom_snps_eusb2_hsphy_write_mask(void __iomem *base, u32 offset,
@@ -236,6 +238,12 @@ static int qcom_snps_eusb2_hsphy_init(struct phy *p)
 	if (ret)
 		return ret;
 
+	ret = phy_init(phy->repeater);
+	if (ret) {
+		dev_err(&p->dev, "repeater init failed. %d\n", ret);
+		goto disable_vreg;
+	}
+
 	ret = clk_prepare_enable(phy->ref_clk);
 	if (ret) {
 		dev_err(&p->dev, "failed to enable ref clock, %d\n", ret);
@@ -343,6 +351,8 @@ static int qcom_snps_eusb2_hsphy_exit(struct phy *p)
 
 	regulator_bulk_disable(ARRAY_SIZE(phy->vregs), phy->vregs);
 
+	phy_exit(phy->repeater);
+
 	return 0;
 }
 
@@ -356,6 +366,7 @@ static const struct phy_ops qcom_snps_eusb2_hsphy_ops = {
 static int qcom_snps_eusb2_hsphy_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
+	struct device_node *np = dev->of_node;
 	struct qcom_snps_eusb2_hsphy *phy;
 	struct phy_provider *phy_provider;
 	struct phy *generic_phy;
@@ -387,6 +398,12 @@ static int qcom_snps_eusb2_hsphy_probe(struct platform_device *pdev)
 	if (ret)
 		return dev_err_probe(dev, ret,
 				     "failed to get regulator supplies\n");
+
+	phy->repeater = devm_of_phy_get_by_index(dev, np, 0);
+	if (IS_ERR(phy->repeater))
+		return dev_err_probe(dev, PTR_ERR(phy->repeater),
+				     "failed to get repeater\n");
+
 	generic_phy = devm_phy_create(dev, NULL, &qcom_snps_eusb2_hsphy_ops);
 	if (IS_ERR(generic_phy)) {
 		dev_err(dev, "failed to create phy %d\n", ret);