linux-kernel - Re: [PATCH v14 1/2] drm: add kms driver for loongson display controller

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Message-ID: <73447e35-f4df-9871-6210-b7bf1a3f04fc@189.cn>
Date:   Mon, 22 May 2023 16:02:34 +0800
From:   Sui Jingfeng <15330273260@....cn>
To:     WANG Xuerui <kernel@...0n.name>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Sui Jingfeng <suijingfeng@...ngson.cn>,
        Li Yi <liyi@...ngson.cn>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Christian Koenig <christian.koenig@....com>,
        Emil Velikov <emil.l.velikov@...il.com>
Cc:     linaro-mm-sig@...ts.linaro.org, loongson-kernel@...ts.loongnix.cn,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        Javier Martinez Canillas <javierm@...hat.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Liu Peibao <liupeibao@...ngson.cn>, linux-media@...r.kernel.org
Subject: Re: [PATCH v14 1/2] drm: add kms driver for loongson display
 controller

Hi,

On 2023/5/21 20:21, WANG Xuerui wrote:
>> --- /dev/null
>> +++ b/drivers/gpu/drm/loongson/Kconfig
>> @@ -0,0 +1,17 @@
>> +# SPDX-License-Identifier: GPL-2.0
>> +
>> +config DRM_LOONGSON
>> +    tristate "DRM support for Loongson Graphics"
>> +    depends on DRM && PCI && MMU
>> +    select DRM_KMS_HELPER
>> +    select DRM_TTM
>> +    select I2C
>> +    select I2C_ALGOBIT
>> +    help
>> +      This is a DRM driver for Loongson Graphics, it may including
>
> Drop "it may"; "including" should be enough.
>
'it may' is more *precise* here, because currently we don't ship with 
the support for loongson 2K series SoC.

I'm try to be precise as far as I can, we avoid made this driver too 
large by ignore loongson 2K series SoC temporary.

>> +      LS7A2000, LS7A1000, LS2K2000 and LS2K1000 etc. Loongson LS7A
>> +      series are bridge chipset, while Loongson LS2K series are SoC.
>> +
>> +      If "M" is selected, the module will be called loongson.
>
> Just "loongson"? 

Yes,  when compile this driver as module,  loongson.ko will be generated.

  drm radeon is also doing so, See drm/radeon/Kconfig.

> I know it's like this for ages (at least dating back to the MIPS days) 
> but you really don't want to imply Loongson is mainly a GPU company. 
> Something like "loongson_drm" or "lsdc" or "gsgpu" could be better. 

No, these name may have backward compatibility problems.

Downstream driver already taken those name.

userspace driver need to differentiate them who is who.