Re: [PATCH v11 2/7] MIPS: Loongson64: dts: introduce ls3A4000 evaluation board

[Sui Jingfeng <15330273260@189.cn>]

On 2022/3/23 20:53, Rob Herring wrote:
> On Wed, Mar 23, 2022 at 09:53:14AM +0800, Sui Jingfeng wrote:
>> On 2022/3/23 00:06, Jiaxun Yang wrote:
>>>
>>> 在 2022/3/22 13:38, Sui Jingfeng 写道:
>>>> On 2022/3/22 21:05, Jiaxun Yang wrote:
>>>>>
>>>>> 在 2022/3/21 16:29, Sui Jingfeng 写道:
>>>>>> From: suijingfeng <suijingfeng@loongson.cn>
>>>>>>
>>>>>> The board name is LS3A4000_7A1000_EVB_BOARD_V1.4, it consist of 1.8Ghz
>>>>>> mips64r5 4-core CPU and LS7A1000 bridge chip. It has PCIe
>>>>>> GEN2 x8 slot,
>>>>>> therefore can play with discrete graphics card.
>>>>> Hi Jingfeng,
>>>>>
>>>>> As we've discussed before if you are going to introduce new dts
>>>>> then you *MUST*
>>>>> include it in makefile and wire it up in code.
>>>>>
>>>>> A dts file doing nothing lying in the tree is just suspicious.
>>>>>
>>>>> Thanks.
>>>>> - Jiaxun
>>>>>
>>>> Hi, Jiaxun,
>>>>
>>>> I know what you means, but it is the kernel side developer's job.
>>>> I am just a naive graphic driver developer,I can not care so much.
>>>> Below is my private patch which can be used to built specific dts
>>>> into the linux kernel, therefore make the verification easier.
>>> Hi Jingfeng,
>>>
>>> In kernel world we take care all the stuff we touched ourself :-)
>>>
>>> If you are not confident with them please drop those DTS from the
>>> patchset
>>> besides the generic one. I can do the rest for you after getting this
>>> set merged.
>>>
>>> Thanks.
>>> - Jiaxun
>>>
>> Hi, Jiaxun
>>
>> Build all dts into vmlinuz will make the vmlinuz bigger and bigger.
>> How does the kernel get the dtb is another big issue, either from built-in
>> dtb or pass from the firmware(pmon and uefi etc). This should be
>> solved with another patch carefully. Providing board specific dts
>> helps to code review, it helps reviewers understand that there are
>> variant boards and have to be express with different OF graph.
> Built-in DTBs are for legacy bootloaders that don't understand DT. I
> would not expect a new platform to need this.
>
>> Now, there are about 6 dts under arch/mips/boot/dts/loongson/,
>> Suppose loongson have 1000+ different board, do you want built all
>> of them into vmlinuz?
> The point was to add the .dts to Makefile so it builds, not so it is
> built-in. How are you testing those build with dtc and dtschema if not
> added to kbuild?
OK, i see the key point.
> Rob