phy: rockchip-typec: support DP phy switch

There are 2 Type-c PHYs in RK3399, but only one DP controller. Hence
only one PHY can connect to DP controller at one time, the other should
be disconnected. The GRF_SOC_CON26 register has a switch bit to do it,
set this bit means enable PHY 1, clear this bit means enable PHY 0.

Signed-off-by: Chris Zhong <[e-mail]>
Signed-off-by: Enric Balletbo i Serra <[e-mail]>
Reviewed-by: Heiko Stuebner <[e-mail]>
Signed-off-by: Kishon Vijay Abraham I <[e-mail]>

drivers/phy/rockchip/phy-rockchip-typec.c

···
  * @pipe_status: the register of type-c phy pipe status.
  * @usb3_host_disable: the register of type-c usb3 host disable.
  * @usb3_host_port: the register of type-c usb3 host port.
+ * @uphy_dp_sel: the register of type-c phy DP select control.
  */
 struct rockchip_usb3phy_port_cfg {
 	unsigned int reg;
···
 	struct usb3phy_reg pipe_status;
 	struct usb3phy_reg usb3_host_disable;
 	struct usb3phy_reg usb3_host_port;
+	struct usb3phy_reg uphy_dp_sel;
 };
 
 struct rockchip_typec_phy {
···
 		.pipe_status	= { 0xe5c0, 0, 0 },
 		.usb3_host_disable = { 0x2434, 0, 16 },
 		.usb3_host_port = { 0x2434, 12, 28 },
+		.uphy_dp_sel	= { 0x6268, 19, 19 },
 	},
 	{
 		.reg = 0xff800000,
···
 		.pipe_status	= { 0xe5c0, 16, 16 },
 		.usb3_host_disable = { 0x2444, 0, 16 },
 		.usb3_host_port = { 0x2444, 12, 28 },
+		.uphy_dp_sel	= { 0x6268, 3, 19 },
 	},
 	{ /* sentinel */ }
 };
···
 static int tcphy_cfg_usb3_to_usb2_only(struct rockchip_typec_phy *tcphy,
 				       bool value)
 {
-	struct rockchip_usb3phy_port_cfg *cfg = tcphy->port_cfgs;
+	const struct rockchip_usb3phy_port_cfg *cfg = tcphy->port_cfgs;
 
 	property_enable(tcphy, &cfg->usb3tousb2_en, value);
 	property_enable(tcphy, &cfg->usb3_host_disable, value);
···
 static int rockchip_dp_phy_power_on(struct phy *phy)
 {
 	struct rockchip_typec_phy *tcphy = phy_get_drvdata(phy);
+	const struct rockchip_usb3phy_port_cfg *cfg = tcphy->port_cfgs;
 	int new_mode, ret = 0;
 	u32 val;
 
···
 	}
 	if (ret)
 		goto unlock_ret;
+
+	property_enable(tcphy, &cfg->uphy_dp_sel, 1);
 
 	ret = readx_poll_timeout(readl, tcphy->base + DP_MODE_CTL,
 				 val, val & DP_MODE_A2, 1000,