phy: usbphyc: use regulator_set_enable_if_allowed for disabling vbus supply
Use regulator_set_enable_if_allowed() api instead of regulator_set_enable()
while disabling vbus supply. This way the driver doesn't see an error
when it disable an always-on regulator for VBUS.
This patch is needed for STM32MP157C-DK2 board when the regulator
v3v3: buck4 used as the phy vbus supply in kernel device tree
is always on with the next hack for low power use-case:
&usbphyc_port0 {
...
/*
* Hack to keep hub active until all connected devices are suspended
* otherwise the hub will be powered off as soon as the v3v3 is disabled
* and it can disturb connected devices.
*/
connector {
compatible = "usb-a-connector";
vbus-supply = <&v3v3>;
};
};
Without this patch and the previous update in DT the command
"usb stop" failed and the next command "usb start" cause a crash.
Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
Reviewed-by: Marek Vasut <marex@denx.de>
diff --git a/drivers/phy/phy-stm32-usbphyc.c b/drivers/phy/phy-stm32-usbphyc.c
index 9f0b7d7..dcf2194 100644
--- a/drivers/phy/phy-stm32-usbphyc.c
+++ b/drivers/phy/phy-stm32-usbphyc.c
@@ -375,7 +375,7 @@
return 0;
if (usbphyc_phy->vbus) {
- ret = regulator_set_enable(usbphyc_phy->vbus, false);
+ ret = regulator_set_enable_if_allowed(usbphyc_phy->vbus, false);
if (ret)
return ret;
}