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

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Date:   Tue, 4 Apr 2017 13:11:58 +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,

Just as an update (and for future reference for anyone having similar issue):

I got this all this sorted-out. Had to change some dt-binding for
device and it was mostly drivers related changes for hardware
components. Mostly nothing to do with DT.

Thanks

Fawad Lateef

-- Fawad Lateef


On 3 April 2017 at 10:54, Fawad Lateef <fawadlateef@...il.com> wrote:
> 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 boot-time "Outdated DT detected, suspend/resume will NOT work" and few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 Now no warning of outdated DT _but_ still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