Hi Geert, sorry for loooong delay ...
On Thu, 14 Apr 2016 21:06:05 +0200, Geert Uytterhoeven <geert@xxxxxxxxxxxxxx> wrote:
> I've just updated my old rbtx4927 from v3.13-rc3 to v4.6-rc3.
> Surprisingly, it boots to nfsroot without any kernel changes.
Good news! I'm happy to hear that.
> However, there's an annoying warning in the boot log:
>
> gpiod_direction_output_raw: invalid GPIO
>
> This is caused by the following code in arch/mips/txx9/rbtx4927/setup.c:
>
> static void __init rbtx4927_mem_setup(void)
> {
>
> /* TX4927-SIO DTR on (PIO[15]) */
> gpio_request(15, "sio-dtr");
>
> returns -EPROBE_DEFER
>
> gpio_direction_output(15, 1);
>
> VALIDATE_DESC triggers the warning.
>
> Probably a silly GPIO conversion was missed during the last 2+ years?
Maybe txx9_gpio_init() failed to add gpio_chip since it was called too
early on startup.
Nowadays gpiochip_add_data calls kzalloc so cannot be called from
plat_mem_setup context.
Could you try moving these txx9_gpio_init(), gpio_request() and
gpio_direction_output() calls to rbtx4927_arch_init() or
rbtx4927_device_init()?
---
Atsushi Nemoto
