linux-kernel - Re: Suggestions needed for resolving DT issues between kernel 3.10 and 4.4

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Date:   Mon, 3 Apr 2017 10:54:48 +0200
From:   Fawad Lateef <fawadlateef@...il.com>
To:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        kernelnewbies@...nelnewbies.org
Subject: Re: Suggestions needed for resolving DT issues between kernel 3.10
 and 4.4

Hi,

One more thing I realised that eth0 which is working is directly out
of SOM/SOC but other 3 eth ports are connected to a internal USB
switch (so Linux should see only eth1 besides eth0).

So seems like flash/nand chip (m25p80) and spi_ks8995 (Micrel KS8995
Ethernet switch SPI) mainly not working.

Thanks



-- Fawad Lateef


On 3 April 2017 at 10:38, Fawad Lateef <fawadlateef@...il.com> wrote:
> Hi,
>
> I am facing some issues with device-trees (I am fairly new to them)
> and need some pointers about how to approach below problem:
>
> I got some I.MX6Q based hardware (some custom made whose hardware
> details are unknown to me). Hardware shipped with 3.10.53 kernel with
> full sources and everything is working on it
>
> Trying to get one of the recent kernel working on it (linux-4.4, from
> linux-linaro-stable with rt patches). I can compile the kernel and
> boot into it using 3.10.xx kernel compiled DTB but getting Warning at
> boot-time "Outdated DT detected, suspend/resume will NOT work" and few
> main hardware components not working (mainly ethernet(s) - 1 out of 4
> ports working though, MTD/NAND (for u-boot environment))
>
> So I looked into compiling the DTS (from 3.10 kernel) for 4.4 and
> managed to get it compiled. Now no warning of outdated DT _but_ still
> hardware components not working.
>
> I was assuming that as hardware is still same for both kernel 3.10 and
> 4.4, so it should work, but seems like something in DT is off for 4.4
> kernel.
>
> Any help and suggestions will be good enough for me to look into above issue.
>
> Thanks and regards,
>
> -- Fawad Lateef