linux-kernel - Re: [PATCH 00/21] ARM: s3c: clean out obsolete platforms

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Message-Id: <e5aa233d-526b-45ab-9acb-ab792b8686bc@app.fastmail.com>
Date:   Mon, 24 Oct 2022 15:18:41 +0200
From:   "Arnd Bergmann" <arnd@...db.de>
To:     "Rob Herring" <robh@...nel.org>, "Arnd Bergmann" <arnd@...nel.org>
Cc:     linux-arm-kernel@...ts.infradead.org,
        "Krzysztof Kozlowski" <krzysztof.kozlowski@...aro.org>,
        linux-kernel@...r.kernel.org, "Ben Dooks" <ben-linux@...ff.org>,
        "Simtec Linux Team" <linux@...tec.co.uk>,
        linux-doc@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
        devicetree@...r.kernel.org, patches@...nsource.cirrus.com,
        linux-stm32@...md-mailman.stormreply.com,
        linux-ide@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-pm@...r.kernel.org, dmaengine@...r.kernel.org,
        linux-hwmon@...r.kernel.org, linux-i2c@...r.kernel.org,
        linux-iio@...r.kernel.org, linux-input@...r.kernel.org,
        linux-leds@...r.kernel.org, linux-media@...r.kernel.org,
        "linux-mmc @ vger . kernel . org" <linux-mmc@...r.kernel.org>,
        linux-mtd@...ts.infradead.org,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        linux-rtc@...r.kernel.org, linux-spi@...r.kernel.org,
        linux-serial@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-fbdev@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-watchdog@...r.kernel.org, alsa-devel@...a-project.org,
        linux-pwm@...r.kernel.org
Subject: Re: [PATCH 00/21] ARM: s3c: clean out obsolete platforms

On Mon, Oct 24, 2022, at 15:00, Rob Herring wrote:
> On Fri, Oct 21, 2022 at 10:22:28PM +0200, Arnd Bergmann wrote:
>> From: Arnd Bergmann <arnd@...db.de>
>> 
>> The s3c24xx platform was marked as deprecated a while ago,
>> and for the s3c64xx platform, we marked all except one legacy
>> board file as unused.
>> 
>> This series removes all of those, leaving only s3c64xx support
>> for DT based boots as well as the cragg6410 board file.
>> 
>> About half of the s3c specific drivers were only used on
>> the now removed machines, so these drivers can be retired
>> as well. I can either merge the driver removal patches through
>> the soc tree along with the board file patches, or subsystem
>> maintainers can pick them up into their own trees, whichever
>> they prefer.
>
> [...]
>
>>  Documentation/arm/index.rst                   |    1 -
>>  Documentation/arm/samsung-s3c24xx/cpufreq.rst |   77 -
>>  .../arm/samsung-s3c24xx/eb2410itx.rst         |   59 -
>>  Documentation/arm/samsung-s3c24xx/gpio.rst    |  172 --
>>  Documentation/arm/samsung-s3c24xx/h1940.rst   |   41 -
>>  Documentation/arm/samsung-s3c24xx/index.rst   |   20 -
>>  Documentation/arm/samsung-s3c24xx/nand.rst    |   30 -
>>  .../arm/samsung-s3c24xx/overview.rst          |  311 ---
>>  Documentation/arm/samsung-s3c24xx/s3c2412.rst |  121 -
>>  Documentation/arm/samsung-s3c24xx/s3c2413.rst |   22 -
>>  .../arm/samsung-s3c24xx/smdk2440.rst          |   57 -
>>  Documentation/arm/samsung-s3c24xx/suspend.rst |  137 --
>>  .../arm/samsung-s3c24xx/usb-host.rst          |   91 -
>>  Documentation/arm/samsung/overview.rst        |   13 -
>
> What about?:
>
> Documentation/devicetree/bindings/clock/samsung,s3c2410-clock.txt
> Documentation/devicetree/bindings/interrupt-controller/samsung,s3c24xx-irq.txt
> Documentation/devicetree/bindings/mmc/samsung,s3cmci.txt

Good catch!

I've removed these three now and and will add the removal to
the same patch, also the related
samsung,s3c2412-clock.txt and samsung,s3c2443-clock.txt
files.

> Documentation/devicetree/bindings/mtd/samsung-s3c2410.txt

samsung,s3c2412-nand is apparently still used on s3c6400,
and the driver is selectable on that platform, so I think
that should remain in there until we remove s3c64xx in 2024,
even if it is not referenced by the dts files in the kernel.

> Documentation/devicetree/bindings/usb/s3c2410-usb.txt

Similarly, the driver is used on the crag6410 board
(without DT), and probably just works with the DT based
boards if one adds a node to s3c64xx.dtsi.

I've also checked if any of the other removed drivers
matches of_device_id[] strings to see if there are more
bindings to kill off, but I don't see any that have
now become obsolete. It did point me to pxa2xx_ac97_dt_ids,
which Robert already complained about, this apparently
is still used with dts files outside of mainline.

      Arnd