[OpenWrt-Devel] Device tree issues with TL-WDR4900 (mpc85xx) and kernel 4.0.1

[Wojciech Dubowik]

On 04/05/15 22:45, Heiner Kallweit wrote:
> I tried to make the TL-WDR4900 work under kernel 4.0.
> Adjusting the platform-specific patches was quickly done and the system boots.
> However I get the following error messages.
>
> [    2.959975] /leds/system: could not get #gpio-cells for /soc at ffe00000/gpio-controller at f000
> [    2.968276] leds-gpio: probe of leds failed with error -22
> [   34.622909] /buttons/reset: could not get #gpio-cells for /soc at ffe00000/gpio-controller at f000
> [   34.631383] gpio-keys buttons: Failed to get gpio flags, error: -22
> [   34.637657] gpio-keys: probe of buttons failed with error -22
>
> I'm not a device tree expert, what I checked so far:
> The gpio-related section in tl-wdr4900-v1.dts is empty
>
> gpio0: gpio-controller at f000 {
>                  };
Gpio controller is now at fc00. See latest commit for 
arch/powerpc/boot/dts/fsl/pq3-gpio-0.dtsi.
Regards,
Wojtek

PS. I have been also trying 4.0 but I have ran into so many problems 
with gianfar that I have given it up.
For now...
> However #gpio-cells is defined in fsl/pq3-gpio-0.dtsi and this file is imported by fsl/p1010si-post.dtsi.
> And fsl/p1010si-post.dtsi is imported by tl-wdr4900-v1.dts.
>
> This worked under 3.19 (despite the fact that 3.19 was never officially supported for this device),
> seems like something with the DT handling has changed in 4.0.
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