phy: renesas: phy-rcar-gen3-usb2: Add USB2.0 PHY support for RZ/V2H(P)

Add USB2.0 PHY support for RZ/V2H(P) SoC.

On the RZ/V2H(P) SoC we need to configure the UTMI to a specific value
as compared to other SoCs (which doesn't need configuring it).

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Link: https://lore.kernel.org/r/20250414145729.343133-5-prabhakar.mahadev-lad.rj@bp.renesas.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

Author: prabhakarlad

drivers/phy/renesas/phy-rcar-gen3-usb2.c

@@ -28,8 +28,10 @@
 #define USB2_INT_ENABLE		0x000
 #define USB2_AHB_BUS_CTR	0x008
 #define USB2_USBCTR		0x00c
+#define USB2_REGEN_CG_CTRL	0x104	/* RZ/V2H(P) only */
 #define USB2_SPD_RSM_TIMSET	0x10c
 #define USB2_OC_TIMSET		0x110
+#define USB2_UTMI_CTRL		0x118	/* RZ/V2H(P) only */
 #define USB2_COMMCTRL		0x600
 #define USB2_OBINTSTA		0x604
 #define USB2_OBINTEN		0x608
@@ -50,12 +52,18 @@
 #define USB2_USBCTR_DIRPD	BIT(2)
 #define USB2_USBCTR_PLL_RST	BIT(1)
 
+/* REGEN_CG_CTRL*/
+#define USB2_REGEN_CG_CTRL_UPHY_WEN	BIT(0)
+
 /* SPD_RSM_TIMSET */
 #define USB2_SPD_RSM_TIMSET_INIT	0x014e029b
 
 /* OC_TIMSET */
 #define USB2_OC_TIMSET_INIT		0x000209ab
 
+/* UTMI_CTRL */
+#define USB2_UTMI_CTRL_INIT		0x8000018f
+
 /* COMMCTRL */
 #define USB2_COMMCTRL_OTG_PERI		BIT(31)	/* 1 = Peripheral mode */
 
@@ -127,12 +135,14 @@ struct rcar_gen3_chan {
 	bool is_otg_channel;
 	bool uses_otg_pins;
 	bool soc_no_adp_ctrl;
+	bool utmi_ctrl;
 };
 
 struct rcar_gen3_phy_drv_data {
 	const struct phy_ops *phy_usb2_ops;
 	bool no_adp_ctrl;
 	bool init_bus;
+	bool utmi_ctrl;
 };
 
 /*
@@ -472,6 +482,14 @@ static int rcar_gen3_phy_usb2_init(struct phy *p)
 		rphy->otg_initialized = true;
 	}
 
+	if (channel->utmi_ctrl) {
+		val = readl(usb2_base + USB2_REGEN_CG_CTRL) | USB2_REGEN_CG_CTRL_UPHY_WEN;
+		writel(val, usb2_base + USB2_REGEN_CG_CTRL);
+
+		writel(USB2_UTMI_CTRL_INIT, usb2_base + USB2_UTMI_CTRL);
+		writel(val & ~USB2_REGEN_CG_CTRL_UPHY_WEN, usb2_base + USB2_REGEN_CG_CTRL);
+	}
+
 	rphy->initialized = true;
 
 	return 0;
@@ -589,6 +607,12 @@ static const struct rcar_gen3_phy_drv_data rz_g3s_phy_usb2_data = {
 	.init_bus = true,
 };
 
+static const struct rcar_gen3_phy_drv_data rz_v2h_phy_usb2_data = {
+	.phy_usb2_ops = &rcar_gen3_phy_usb2_ops,
+	.no_adp_ctrl = true,
+	.utmi_ctrl = true,
+};
+
 static const struct of_device_id rcar_gen3_phy_usb2_match_table[] = {
 	{
 		.compatible = "renesas,usb2-phy-r8a77470",
@@ -610,6 +634,10 @@ static const struct of_device_id rcar_gen3_phy_usb2_match_table[] = {
 		.compatible = "renesas,usb2-phy-r9a08g045",
 		.data = &rz_g3s_phy_usb2_data,
 	},
+	{
+		.compatible = "renesas,usb2-phy-r9a09g057",
+		.data = &rz_v2h_phy_usb2_data,
+	},
 	{
 		.compatible = "renesas,rzg2l-usb2-phy",
 		.data = &rz_g2l_phy_usb2_data,
@@ -763,6 +791,8 @@ static int rcar_gen3_phy_usb2_probe(struct platform_device *pdev)
 	if (phy_data->no_adp_ctrl)
 		channel->obint_enable_bits = USB2_OBINT_IDCHG_EN;
 
+	channel->utmi_ctrl = phy_data->utmi_ctrl;
+
 	mutex_init(&channel->lock);
 	for (i = 0; i < NUM_OF_PHYS; i++) {
 		channel->rphys[i].phy = devm_phy_create(dev, NULL,