It's needed on STM32MP15, when using the integrated full-speed PHY. This
clock is an output of USBPHYC, and the HS USBPHYC is not attached as PHY
in this case (managed directly by dwc2 ggpio glue):
&usbotg_hs {
compatible = "st,stm32mp15-fsotg", "snps,dwc2";
pinctrl-names = "default";
pinctrl-0 = <&usbotg_hs_pins_a &usbotg_fs_dp_dm_pins_a>;
vbus-supply = <&vbus_otg>;
status = "okay";
};
USBPHYC clock output must be used, so it can be properly enabled as a
clock provider.
Without this, currently, when the dualport High-Speed USBPHYC isn't
requested by either USBH or OTG, it remains uninitialized when probing
OTG: OTG configured with full-speed PHY isn't properly clocked, resulting
in error log like:
[ 2.383138] dwc2
49000000.usb-otg: dwc2_core_reset: HANG! Soft Reset
timeout GRSTCTL_CSFTRST.
Signed-off-by: Fabrice Gasnier <fabrice.gasnier@foss.st.com>
Link: https://lore.kernel.org/r/20230414084137.1050487-5-fabrice.gasnier@foss.st.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
usbotg_hs: usb-otg@49000000 {
compatible = "st,stm32mp15-hsotg", "snps,dwc2";
reg = <0x49000000 0x10000>;
- clocks = <&rcc USBO_K>;
- clock-names = "otg";
+ clocks = <&rcc USBO_K>, <&usbphyc>;
+ clock-names = "otg", "utmi";
resets = <&rcc USBO_R>;
reset-names = "dwc2";
interrupts = <GIC_SPI 98 IRQ_TYPE_LEVEL_HIGH>;