[PATCH 2/2] clk: imx8mp: use usb_core_ref for usb_root_clk

[Andrey Zhizhikin]

Upstream commit 7a2c3be95a50 ("clk: imx8mp: Fill in DWC3 USB, USB PHY,
HSIOMIX clock") added usb_core_ref for USB Controller but never set it
to be used as a clock source, using rather "osc_32k" instead.

This produces following boot log message:
"clk_register: failed to get osc_32k device (parent of usb_root_clk)"

Fix the USB controller clock source by using usb_core_ref instead of
osc_32k.

Fixes: 7a2c3be95a50 ("clk: imx8mp: Fill in DWC3 USB, USB PHY, HSIOMIX clock")
Signed-off-by: Andrey Zhizhikin <andrey.zhizhikin at leica-geosystems.com>
Cc: Fabio Estevam <festevam at denx.de>
Cc: Peng Fan <peng.fan at nxp.com>
Cc: Stefano Babic <sbabic at denx.de>
---
 drivers/clk/imx/clk-imx8mp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clk/imx/clk-imx8mp.c b/drivers/clk/imx/clk-imx8mp.c
index cbed86a684..ffbc1d1ba9 100644
--- a/drivers/clk/imx/clk-imx8mp.c
+++ b/drivers/clk/imx/clk-imx8mp.c
@@ -300,7 +300,7 @@ static int imx8mp_clk_probe(struct udevice *dev)
 	clk_dm(IMX8MP_CLK_UART2_ROOT, imx_clk_gate4("uart2_root_clk", "uart2", base + 0x44a0, 0));
 	clk_dm(IMX8MP_CLK_UART3_ROOT, imx_clk_gate4("uart3_root_clk", "uart3", base + 0x44b0, 0));
 	clk_dm(IMX8MP_CLK_UART4_ROOT, imx_clk_gate4("uart4_root_clk", "uart4", base + 0x44c0, 0));
-	clk_dm(IMX8MP_CLK_USB_ROOT, imx_clk_gate4("usb_root_clk", "osc_32k", base + 0x44d0, 0));
+	clk_dm(IMX8MP_CLK_USB_ROOT, imx_clk_gate4("usb_root_clk", "usb_core_ref", base + 0x44d0, 0));
 	clk_dm(IMX8MP_CLK_USB_PHY_ROOT, imx_clk_gate4("usb_phy_root_clk", "usb_phy_ref", base + 0x44f0, 0));
 	clk_dm(IMX8MP_CLK_USDHC1_ROOT, imx_clk_gate4("usdhc1_root_clk", "usdhc1", base + 0x4510, 0));
 	clk_dm(IMX8MP_CLK_USDHC2_ROOT, imx_clk_gate4("usdhc2_root_clk", "usdhc2", base + 0x4520, 0));
-- 
2.25.1