[PATCH v2 1/2] pinctrl: bcm2835: Change init order for gpio hogs

[Linus Walleij]

On Wed, Dec 29, 2021 at 8:07 PM Stefan Wahren <stefan.wahren at i2se.com> wrote:
> Am 10.12.21 um 00:24 schrieb Linus Walleij:
> > On Mon, Dec 6, 2021 at 10:22 AM Phil Elwell <phil at raspberrypi.com> wrote:
> >
> >> ...and gpio-ranges
> >>
> >> pinctrl-bcm2835 is a combined pinctrl/gpio driver. Currently the gpio
> >> side is registered first, but this breaks gpio hogs (which are
> >> configured during gpiochip_add_data). Part of the hog initialisation
> >> is a call to pinctrl_gpio_request, and since the pinctrl driver hasn't
> >> yet been registered this results in an -EPROBE_DEFER from which it can
> >> never recover.
> >>
> >> Change the initialisation sequence to register the pinctrl driver
> >> first.
> >>
> >> This also solves a similar problem with the gpio-ranges property, which
> >> is required in order for released pins to be returned to inputs.
> >>
> >> Fixes: 73345a18d464b ("pinctrl: bcm2835: Pass irqchip when adding gpiochip")
> >> Signed-off-by: Phil Elwell <phil at raspberrypi.com>
> > This patch (1/2) applied for fixes.
>
> Unfortunately this change breaks all GPIO LEDs at least on the Raspberry
> Pi 3 Plus (Linux 5.16-rc7, multi_v7_defconfig). The ACT LED for instance
> stays in the last state instead of the configured heartbeat behavior.
> Also there are no GPIO LEDs in /sys/class/leds/ directory.
>
> After reverting this change everything is back to normal.

Oh what a mess. OK I reverted the fix.

Yours,
Linus Walleij