Hi Geert, sorry for loooong delay ...

On Thu, 14 Apr 2016 21:06:05 +0200, Geert Uytterhoeven [off-list ref] 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