linux-kernel - Re: [PATCH 0/3] add Ebang EBAZ4205 support

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Message-ID: <a346e761397a14d2effd4806e53395e5@walle.cc>
Date:   Thu, 21 Jan 2021 16:14:52 +0100
From:   Michael Walle <michael@...le.cc>
To:     Michal Simek <michal.simek@...inx.com>
Cc:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        Arnd Bergmann <arnd@...db.de>, Olof Johansson <olof@...om.net>,
        soc@...nel.org
Subject: Re: [PATCH 0/3] add Ebang EBAZ4205 support

Am 2021-01-21 14:16, schrieb Michal Simek:
> On 1/21/21 11:41 AM, Michael Walle wrote:
>> Am 2021-01-21 11:23, schrieb Michal Simek:
>>>>> Back to your case. Board is cheap which is not all the time case 
>>>>> for
>>>>> any
>>>>> xilinx board but you have only uart, sd and partially described
>>>>> ethernet
>>>>> which doesn't work without PL. Is it worth to have this described?
>>>> 
>>>> I got your point. But it is at least a jump start for the users if 
>>>> that
>>>> board boots out of the box. And yes, its unfortunate, that ethernet
>>>> just works if the PL is configured. This is already done by the
>>>> bootloader, because there I do have the same problem.
>>> 
>>> Zynq/ZynqMP boards can use U-Boot SPL. "Advantage" of this solution
>>> especially for Zynq is that in u-boot there is open a way for adding
>>> ps7_init file which is determined by device tree name.
>>> I think it would make sense to add these DTs and also ps7_init to 
>>> U-Boot
>>> project and wire it up with zynq_virt platform and then you can boot
>>> Linux with using U-Boot's DT pointed by $fdtcontroladdr.
>>> Then you will get support from scratch to be able to boot.
>> 
>> I already have patches for u-boot (using SPL). But my impression was
>> that linux is the master for the device trees. Esp. if there are some
>> problems with the board its often useful to have an in-tree device
>> tree.
>> 
>> What is the difference between this board and the other zynq boards
>> in the kernel?
>> 
>> In any case, please make this decision now: will you accept this
>> device tree or not?
> 
> If you promise to regularly test it I am fine with it.

I might even integrate it into our lava lab.

-michael