[PATCH RFC 3/3] phy: renesas: phy-rcar-gen3-usb2: Control VBUSEN selection

[Biju Das]

As per RZ/G2L HW(Rev.1.30 May2023) manual, VBUSEN can be controlled by
the Port Power bit of the EHCI/OHCI operational register or by the VBOUT
bit of the VBUS Control Register. Control VBUSEN selection such that bit
is set to 0 (Port Power bit of the EHCI/OHCI operational register) for
host operation and set the bit to 1 (VBOUT bit of the VBUS Control
Register) for device operation.

Signed-off-by: Biju Das <biju.das.jz at bp.renesas.com>
---
 drivers/phy/renesas/phy-rcar-gen3-usb2.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/phy/renesas/phy-rcar-gen3-usb2.c b/drivers/phy/renesas/phy-rcar-gen3-usb2.c
index d4e2ee7e4efb..429b1d44eee7 100644
--- a/drivers/phy/renesas/phy-rcar-gen3-usb2.c
+++ b/drivers/phy/renesas/phy-rcar-gen3-usb2.c
@@ -21,6 +21,8 @@
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
 #include <linux/regulator/consumer.h>
+#include <linux/reset.h>
+#include <linux/reset/rzg2l-usbphy-ctrl.h>
 #include <linux/string.h>
 #include <linux/usb/of.h>
 #include <linux/workqueue.h>
@@ -113,6 +115,7 @@ struct rcar_gen3_chan {
 	struct extcon_dev *extcon;
 	struct rcar_gen3_phy rphys[NUM_OF_PHYS];
 	struct regulator *vbus;
+	struct reset_control *rstc;
 	struct work_struct work;
 	struct mutex lock;	/* protects rphys[...].powered */
 	enum usb_dr_mode dr_mode;
@@ -190,6 +193,7 @@ static void rcar_gen3_enable_vbus_ctrl(struct rcar_gen3_chan *ch, int vbus)
 
 	dev_vdbg(ch->dev, "%s: %08x, %d\n", __func__, val, vbus);
 	if (ch->soc_no_adp_ctrl) {
+		rzg2l_usbphy_ctrl_select_vbus_ctrl(ch->rstc, vbus ? 0 : 1);
 		vbus_ctrl_reg = USB2_VBCTRL;
 		vbus_ctrl_val = USB2_VBCTRL_VBOUT;
 	}
@@ -670,6 +674,11 @@ static int rcar_gen3_phy_usb2_probe(struct platform_device *pdev)
 	if (IS_ERR(channel->base))
 		return PTR_ERR(channel->base);
 
+	channel->rstc = devm_reset_control_get_optional_shared(&pdev->dev,
+							       NULL);
+	if (IS_ERR(channel->rstc))
+		return PTR_ERR(channel->rstc);
+
 	channel->obint_enable_bits = USB2_OBINT_BITS;
 	/* get irq number here and request_irq for OTG in phy_init */
 	channel->irq = platform_get_irq_optional(pdev, 0);
-- 
2.25.1