On linux-4.4 and linux-4.9 we get a warning about an array that is never initialized when CONFIG_REGULATOR is disabled:
drivers/usb/phy/phy-msm-usb.c: In function 'msm_otg_probe': drivers/usb/phy/phy-msm-usb.c:1911:14: error: 'regs[0].consumer' may be used uninitialized in this function [-Werror=maybe-uninitialized] motg->vddcx = regs[0].consumer; ~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~ drivers/usb/phy/phy-msm-usb.c:1912:14: error: 'regs[1].consumer' may be used uninitialized in this function [-Werror=maybe-uninitialized] motg->v3p3 = regs[1].consumer; ~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~ drivers/usb/phy/phy-msm-usb.c:1913:14: error: 'regs[2].consumer' may be used uninitialized in this function [-Werror=maybe-uninitialized] motg->v1p8 = regs[2].consumer;
This adds a Kconfig dependency for it. In newer kernels, the driver no longer exists, so this is only needed for stable kernels.
Signed-off-by: Arnd Bergmann arnd@arndb.de --- drivers/usb/phy/Kconfig | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/usb/phy/Kconfig b/drivers/usb/phy/Kconfig index b9c409a18faa..125cea1c3c8d 100644 --- a/drivers/usb/phy/Kconfig +++ b/drivers/usb/phy/Kconfig @@ -147,6 +147,7 @@ config USB_MSM_OTG depends on (USB || USB_GADGET) && (ARCH_QCOM || COMPILE_TEST) depends on USB_GADGET || !USB_GADGET # if USB_GADGET=m, this can't be 'y' depends on RESET_CONTROLLER + depends on REGULATOR depends on EXTCON select USB_PHY help