Re: [PATCH] usb: phy: mxs: manually reset phy regs after a warm reset

The usb phy registers are not fully reset on warm reset under stress
conditions. We need to manually reset those (CTRL, PWD, DEBUG, PLL_SIC)
regs after a warm reset. This will reset DEBUG and PLL_SIC registers.
CTRL and PWD register are handled by "SFT" bit in stmp_reset_block().

ERR051269: USB PHY registers not fully resetting on warm reset under
           stress conditions

The following USB PHY registers must be written by SW to restore the reset
value after a warm reset:

Reg: ctrl Addr: 0x29910030 Data: 0xc000_0000
Reg: pwd Addr: 0x29910000 Data: 0x001e_1c00
Reg: debug0 Addr: 0x29910050 Data: 0x7f18_0000
Reg: pll_sic Addr: 0x299100a0 Data: 0x00d1_2000

Signed-off-by: Xu Yang <xu.yang_2@nxp.com>
---
 drivers/usb/phy/phy-mxs-usb.c | 32 +++++++++++++++++++++++++++++---
 1 file changed, 29 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/phy/phy-mxs-usb.c b/drivers/usb/phy/phy-mxs-usb.c
index 7069dd3f4d0d..dd42db8a0829 100644
--- a/drivers/usb/phy/phy-mxs-usb.c
+++ b/drivers/usb/phy/phy-mxs-usb.c

@@ -209,6 +209,9 @@ static const struct mxs_phy_data imx6ul_phy_data = {
 static const struct mxs_phy_data imx7ulp_phy_data = {
 };
 
+static const struct mxs_phy_data imx8ulp_phy_data = {
+};
+
 static const struct of_device_id mxs_phy_dt_ids[] = {
 	{ .compatible = "fsl,imx6sx-usbphy", .data = &imx6sx_phy_data, },
 	{ .compatible = "fsl,imx6sl-usbphy", .data = &imx6sl_phy_data, },

@@ -217,6 +220,7 @@ static const struct of_device_id mxs_phy_dt_ids[] = {
 	{ .compatible = "fsl,vf610-usbphy", .data = &vf610_phy_data, },
 	{ .compatible = "fsl,imx6ul-usbphy", .data = &imx6ul_phy_data, },
 	{ .compatible = "fsl,imx7ulp-usbphy", .data = &imx7ulp_phy_data, },
+	{ .compatible = "fsl,imx8ulp-usbphy", .data = &imx8ulp_phy_data, },