Hi Tony,
On Wed, Jan 11, 2017 at 11:13 PM, Tony Lindgren <t...@atomide.com> wrote:
> Commit df61b366af26 ("pinctrl: core: Use delayed work for hogs") caused a
> regression at least with sh-pfc that is also a GPIO controller as
> noted by Geert Uytterhoeven <ge...@linux-m68k.org>.
>
> As the original pinctrl_register() has issues calling pin controller
> driver functions early before the controller has finished registering,
> we can't just revert commit df61b366af26. That would break the drivers
> using GENERIC_PINCTRL_GROUPS or GENERIC_PINMUX_FUNCTIONS.
>
> So let's fix the issue with the following steps as a single patch:
>
> 1. Revert the late_init parts of commit df61b366af26.
>
> The late_init clearly won't work and we have to just give up
> on fixing pinctrl_register() for GENERIC_PINCTRL_GROUPS and
> GENERIC_PINMUX_FUNCTIONS.
>
> 2. Split pinctrl_register() into two parts
>
> By splitting pinctrl_register() into pinctrl_init_controller()
> and pinctrl_create_and_start() we have better control over when
> it's safe to call pinctrl_create().
>
> 3. Introduce a new pinctrl_register_and_init() function
>
> As suggested by Linus Walleij <linus.wall...@linaro.org>, we
> can just introduce a new function for the controllers that need
> pinctrl_create() called later.
>
> 4. Convert the four known problem cases to use new function
>
> Let's convert pinctrl-imx, pinctrl-single, sh-pfc and ti-iodelay
> to use the new function to fix the issues. The rest of the drivers
> can be converted later. Let's also update Documentation/pinctrl.txt
> accordingly because of the known issues with pinctrl_register().
>
> Fixes: df61b366af26 ("pinctrl: core: Use delayed work for hogs")
> Reported-by: Geert Uytterhoeven <ge...@linux-m68k.org>
> Cc: Gary Bisson <gary.bis...@boundarydevices.com>
> Signed-off-by: Tony Lindgren <t...@atomide.com>
Thanks, this fixes r8a7740/armadillo.
Tested-by: Geert Uytterhoeven <geert+rene...@glider.be>
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- ge...@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
