linux-kernel - [PATCH] phy: tegra: xusb: Support USB role default mode

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Message-ID: <20221216042146.99307-1-haotienh@nvidia.com>
Date:   Fri, 16 Dec 2022 12:21:46 +0800
From:   Haotien Hsu <haotienh@...dia.com>
To:     Vinod Koul <vkoul@...nel.org>,
        Kishon Vijay Abraham I <kishon@...nel.org>
CC:     JC Kuo <jckuo@...dia.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Wayne Chang <waynec@...dia.com>,
        <linux-phy@...ts.infradead.org>, <linux-tegra@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, Haotien Hsu <haotienh@...dia.com>
Subject: [PATCH] phy: tegra: xusb: Support USB role default mode

Support role-switch-default-mode property when usb-role-switch is
enabled.

Signed-off-by: Haotien Hsu <haotienh@...dia.com>
---
 drivers/phy/tegra/xusb.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/phy/tegra/xusb.c b/drivers/phy/tegra/xusb.c
index 3707a0b5c1ae..78045bd6c214 100644
--- a/drivers/phy/tegra/xusb.c
+++ b/drivers/phy/tegra/xusb.c
@@ -718,6 +718,22 @@ static int tegra_xusb_setup_usb_role_switch(struct tegra_xusb_port *port)
 	return err;
 }
 
+static void tegra_xusb_parse_usb_role_default_mode(struct tegra_xusb_port *port)
+{
+	enum usb_role role = USB_ROLE_NONE;
+	enum usb_dr_mode mode = usb_get_role_switch_default_mode(&port->dev);
+
+	if (mode == USB_DR_MODE_HOST)
+		role = USB_ROLE_HOST;
+	else if (mode == USB_DR_MODE_PERIPHERAL)
+		role = USB_ROLE_DEVICE;
+
+	if (role != USB_ROLE_NONE) {
+		usb_role_switch_set_role(port->usb_role_sw, role);
+		dev_dbg(&port->dev, "usb role default mode is %s", modes[mode]);
+	}
+}
+
 static int tegra_xusb_usb2_port_parse_dt(struct tegra_xusb_usb2_port *usb2)
 {
 	struct tegra_xusb_port *port = &usb2->base;
@@ -747,6 +763,7 @@ static int tegra_xusb_usb2_port_parse_dt(struct tegra_xusb_usb2_port *usb2)
 			err = tegra_xusb_setup_usb_role_switch(port);
 			if (err < 0)
 				return err;
+			tegra_xusb_parse_usb_role_default_mode(port);
 		} else {
 			dev_err(&port->dev, "usb-role-switch not found for %s mode",
 				modes[usb2->mode]);
-- 
2.25.1