linux-kernel - Re: [PATCH RFC 00/20] ARM: oxnas support removal

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Message-ID: <23e513ad-9fca-30cd-1f08-2ff559072314@linaro.org>
Date:   Fri, 31 Mar 2023 16:57:05 +0200
From:   Neil Armstrong <neil.armstrong@...aro.org>
To:     Arnd Bergmann <arnd@...db.de>, Olof Johansson <olof@...om.net>,
        soc@...nel.org, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Russell King <linux@...linux.org.uk>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Sebastian Reichel <sre@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Marc Zyngier <maz@...nel.org>
Cc:     linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-mtd@...ts.infradead.org, Netdev <netdev@...r.kernel.org>,
        linux-stm32@...md-mailman.stormreply.com,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        linux-pm@...r.kernel.org, Daniel Golle <daniel@...rotopia.org>
Subject: Re: [PATCH RFC 00/20] ARM: oxnas support removal

On 31/03/2023 15:42, Arnd Bergmann wrote:
> On Fri, Mar 31, 2023, at 10:34, Neil Armstrong wrote:
>> With [1] removing MPCore SMP support, this makes the OX820 barely usable,
>> associated with a clear lack of maintainance, development and migration to
>> dt-schema it's clear that Linux support for OX810 and OX820 should be removed.
>>
>> In addition, the OX810 hasn't been booted for years and isn't even present
>> in an ARM config file.
>>
>> For the OX820, lack of USB and SATA support makes the platform not usable
>> in the current Linux support and relies on off-tree drivers hacked from the
>> vendor (defunct for years) sources.
>>
>> The last users are in the OpenWRT distribution, and today's removal means
>> support will still be in stable 6.1 LTS kernel until end of 2026.
>>
>> If someone wants to take over the development even with lack of SMP, I'll
>> be happy to hand off maintainance.
>>
>> The plan is to apply the first 4 patches first, then the drivers
>> followed by bindings. Finally the MAINTAINANCE entry can be removed.
>>
>> I'm not sure about the process of bindings removal, but perhaps the bindings
>> should be marked as deprecated first then removed later on ?
>>
>> It has been a fun time adding support for this architecture, but it's time
>> to get over!
>>
>> Patch 2 obviously depends on [1].
>>
>> [1] https://lore.kernel.org/all/20230327121317.4081816-1-arnd@kernel.org/
>>
>> Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
> 
> Thanks a lot for going through this and preparing the patches!
> 
> I've discussed this with Daniel Golle on the OpenWRT channel as well,
> and he indicated that the timing is probably fine here, as there are
> already close to zero downloads for oxnas builds, and the 6.1 kernel
> will only be part of a release in 2024.
> 
> For the dependency on my other patch, I'd suggest you instead
> remove the SMP files here as well, which means we can merge either
> part independently based on just 6.3-rc. I can do that change
> myself by picking up patches 1-4 of your RFC series, or maybe you
> can send resend them after rebase to 6.3-rc1.

Ack I'll send patches 1-4 rebased on v6.3-rc1 with the acks
and sent a PR next week.

> 
> For the driver removals, I think we can merge those at the same
> time as the platform removal since there are no shared header files
> that would cause build time regressions and there are no runtime
> regressions other than breaking the platform itself. Maybe
> just send the driver removal separately to the subsystem
> maintainers with my
> 
> Acked-by: Arnd Bergmann <arnd@...db.de>

Thanks, I'll submit those individually once the first patches are merged.

Neil

> 
>       Arnd