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

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Date:   Wed, 23 Mar 2022 02:29:59 +0000
From:   Jiaxun Yang <jiaxun.yang@...goat.com>
To:     Sui Jingfeng <15330273260@....cn>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Roland Scheidegger <sroland@...are.com>,
        Zack Rusin <zackr@...are.com>,
        Christian Gmeiner <christian.gmeiner@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Andrey Zhizhikin <andrey.zhizhikin@...ca-geosystems.com>,
        Sam Ravnborg <sam@...nborg.org>,
        "David S . Miller" <davem@...emloft.net>,
        Lucas Stach <l.stach@...gutronix.de>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Ilia Mirkin <imirkin@...m.mit.edu>,
        Qing Zhang <zhangqing@...ngson.cn>,
        suijingfeng <suijingfeng@...ngson.cn>
Cc:     linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        chenhuacai@...nel.org, Tiezhu Yang <yangtiezhu@...ngson.cn>,
        liyi@...ngson.cn
Subject: Re: [PATCH v11 2/7] MIPS: Loongson64: dts: introduce ls3A4000
 evaluation board



在 2022/3/23 1:53, Sui Jingfeng 写道:
> 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.
Hi,

I insist my taste on those code. If the only intention is to demonstrate
the usage of the driver then please just leave them in dt document
or commit message.

>
> 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?
Note that we are supporting all those boards on "platform" bias. Which
means if they share similar design then they will use the same DTS.
If we have a new design then unfortunately our kernel binary must grow.

For those who intended to build a size-optimized kernel they will be
able to disable unused DTS in Kconfig.

If you want to blame somebody for the problem then please don't
blame us. We tried very hard to fit all those stuff into kernel's model
of devices. You should blame those who did the initial design of
Loongson's boot interface that failed to introduce a proper way
to describe the platform.

>
> Besides, ls7a1000 and ls2k1000 lack a i2c driver, gpio driver,
> pwm driver, clk driver, can you pay more attention to salve those
> problems, please ?
Are you trying to make a TODO list for your colleague :-)

We , community developers, don't owe you anything. So please
don't expect anything from us. I lost access to most Loongson
devices since I'm currently study abroad, but I'm determined to
keep platform code in a good shape. That's my duty as a maintainer.

Thanks.
- Jiaxun