linux-kernel - Re: [RFC PATCH 0/9] initial support for "suniv" Allwinner new ARM9 SoC

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Date:   Wed, 24 Jan 2018 21:10:34 +0800
From:   Icenowy Zheng <icenowy@...c.io>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     Maxime Ripard <maxime.ripard@...e-electrons.com>,
        devicetree@...r.kernel.org, linux-sunxi@...glegroups.com,
        Marc Zyngier <marc.zyngier@....com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Russell King <linux@...linux.org.uk>,
        linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
        Chen-Yu Tsai <wens@...e.org>, linux-clk@...r.kernel.org
Subject: Re: [RFC PATCH 0/9] initial support for "suniv" Allwinner new ARM9 SoC

在 2018年1月22日星期一 CST 下午8:14:35，Maxime Ripard 写道：
> On Sat, Jan 20, 2018 at 07:17:26AM +0800, Icenowy Zheng wrote:
> > This is the RFC initial patchset for the "new" Allwinner SUNIV ARM9 SoC.
> > 
> > The same die is packaged differently, come with different co-packaged
> > DRAM or shipped with different SDK; and then made many model names: F23,
> > F25, F1C100A, F1C100S, F1C200S, F1C500, F1C600, R6, etc. These SoCs all
> > share a common feature set and are packaged similarly (eLQFP128 for SoCs
> > without co-packaged DRAM, QFN88 for with DRAM). As their's no
> > functionality hidden on the QFN88 models (except DRAM interface not
> > exported), it's not clever to differentiate them. So I will use suniv as
> > common name of all these SoCs.
> 
> Where is that suniv prefix coming from?

The BSP (Melis and Linux). (e.g. "libs/suniv" directory of the Melis SDK and 
"arch/arm/boot/dts/sunivw1p1.dtsi" in the Linux SDK)

> 
> And you need to have a SoC in all your compatibles. This isn't about
> being clever or not, this is just a matter of being able to accurately
> read in a crystal ball. Or maybe it's just the same, in which case,
> I'd really like to have a course :)

Okay. I will choose to use f1c100s in my next patchset, as it's where
it's developed. (Although I mainly refered F1C600 BSP and document)

> 
> You should really answer two questions here:
>   - Are you able to predict whether you'll find an SoC part of that
>     family in the future that derives a bit and will need a compatible
>     of its own?
>   - Are you able to predict which quirks we'll need along the way to
>     support all the SoCs you've listed there?
> 
> If you can't answer yes to both these questions, with a 100%
> certainty, then you'll need a SoC name in the compatible.
> 
> Which doesn't prevent you from sharing as much as possible the DT like
> we did between the A10s and the A13 for example.

So the suniv-f1c100s.dtsi will still be kept empty and all peripherals known 
should go through suniv.dtsi.

> 
> Maxime