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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>
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@ -375,7 +375,7 @@ static int stm32_usbphyc_phy_power_off(struct phy *phy)
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return 0;
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if (usbphyc_phy->vbus) {
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ret = regulator_set_enable(usbphyc_phy->vbus, false);
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ret = regulator_set_enable_if_allowed(usbphyc_phy->vbus, false);
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if (ret)
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return ret;
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}
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