On Mon, May 21, 2018 at 10:57 PM, Christian Lamparter <chunkeey@xxxxxxxxx> wrote: > Sven Eckelmann reported an issue with the current IPQ4019 pinctrl. > Setting up any gpio-hog in the device-tree for his device would > "kill the bootup completely": > > | [ 0.477838] msm_serial 78af000.serial: could not find pctldev for node /soc/pinctrl@1000000/serial_pinmux, deferring probe > | [ 0.499828] spi_qup 78b5000.spi: could not find pctldev for node /soc/pinctrl@1000000/spi_0_pinmux, deferring probe > | [ 1.298883] requesting hog GPIO enable USB2 power (chip 1000000.pinctrl, offset 58) failed, -517 > | [ 1.299609] gpiochip_add_data: GPIOs 0..99 (1000000.pinctrl) failed to register > | [ 1.308589] ipq4019-pinctrl 1000000.pinctrl: Failed register gpiochip > | [ 1.316586] msm_serial 78af000.serial: could not find pctldev for node /soc/pinctrl@1000000/serial_pinmux, deferring probe > | [ 1.322415] spi_qup 78b5000.spi: could not find pctldev for node /soc/pinctrl@1000000/spi_0_pinmux, deferri > > This was also verified on a RT-AC58U (IPQ4018) which would > no longer boot, if a gpio-hog was specified. (Tried forcing > the USB LED PIN (GPIO0) to high.). > > The problem is that Pinctrl+GPIO registration is currently > peformed in the following order in pinctrl-msm.c: > 1. pinctrl_register() > 2. gpiochip_add() > 3. gpiochip_add_pin_range() > > The actual error code -517 == -EPROBE_DEFER is coming from > pinctrl_get_device_gpio_range(), which is called through: > gpiochip_add > of_gpiochip_add > of_gpiochip_scan_gpios > gpiod_hog > gpiochip_request_own_desc > __gpiod_request > chip->request > gpiochip_generic_request > pinctrl_gpio_request > pinctrl_get_device_gpio_range > > pinctrl_get_device_gpio_range() is unable to find any valid > pin ranges, since nothing has been added to the pinctrldev_list yet. > so the range can't be found, and the operation fails with -EPROBE_DEFER. > > This patch fixes the issue by adding the "gpio-ranges" property to > the pinctrl device node of all upstream Qcom SoC. The pin ranges are > then added by the gpio core. > > In order to remain compatible with older, existing DTs (and ACPI) > a check for the "gpio-ranges" property has been added to > msm_gpio_init(). This prevents the driver of adding the same entry > to the pinctrldev_list twice. > > Reported-by: Sven Eckelmann <sven.eckelmann@xxxxxxxxxxxx> > Tested-by: Sven Eckelmann <sven.eckelmann@xxxxxxxxxxxx> [ipq4019] > Reviewed-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx> > Signed-off-by: Christian Lamparter <chunkeey@xxxxxxxxx> Patch applied. Yours, Linus Walleij -- To unsubscribe from this list: send the line "unsubscribe linux-arm-msm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
