quoted

This patch causes these new errors on NVIDIA Tegra30 Nexus 7 using recent linux-next:

 gpio-1022 (cpu-pwr-req-hog): hogged as input
 max77620-pinctrl max77620-pinctrl: pin gpio4 already requested by max77620-pinctrl; cannot claim for gpiochip1
 max77620-pinctrl max77620-pinctrl: pin-4 (gpiochip1) status -22
 max77620-pinctrl max77620-pinctrl: could not request pin 4 (gpio4) from group gpio4  on device max77620-pinctrl
 gpio_stub_drv gpiochip1: Error applying setting, reverse things back
 gpio_stub_drv: probe of gpiochip1 failed with error -22

Please fix, thanks in advance.

I have a partial guess on why this is happening. So can you try this patch?

Thanks,
Saravana

--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c

@@ -4213,6 +4213,8 @@ static int gpio_stub_drv_probe(struct device *dev)
         * gpio_device of the GPIO chip with the firmware node and then simply
         * bind it to this stub driver.
         */
+       if (dev->fwnode && dev->fwnode->dev != dev)
+               return -EBUSY;
        return 0;
 }