linux-kernel - Re: [GIT PULL 1/6] samsung: soc: drivers: for v5.17

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Message-ID: <CAK8P3a1A+6f1OsJ-8-8kbmXXbbsrQZTQywOAy59tJoUmdDN49g@mail.gmail.com>
Date:   Mon, 20 Dec 2021 17:26:17 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
Cc:     Olof Johansson <olof@...om.net>, Arnd Bergmann <arnd@...db.de>,
        arm-soc <arm@...nel.org>, SoC Team <soc@...nel.org>,
        Sam Protsenko <semen.protsenko@...aro.org>,
        Chanho Park <chanho61.park@...sung.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/SAMSUNG EXYNOS ARM ARCHITECTURES" 
        <linux-samsung-soc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>
Subject: Re: [GIT PULL 1/6] samsung: soc: drivers: for v5.17

On Mon, Dec 20, 2021 at 12:54 PM Krzysztof Kozlowski
<krzysztof.kozlowski@...onical.com> wrote:
> ----------------------------------------------------------------
> Samsung SoC drivers changes for v5.17
>
> 1. Exynos ChipID: add Exynos7885 support.
> 2. Exynos PMU: add Exynos850 support.
> 3. Minor bindings cleanup.
> 4. Add Exynos USIv2 (Universal Serial Interface) driver. The USI block is
>    a shared IP block between I2C, UART/serial and SPI. Basically one has
>    to choose which feature the USI block will support and later the
>    regular I2C/serial/SPI driver will bind and work.
>    This merges also one commit with dt-binding headers from my dts64
>    pull request.
>
>    Together with a future serial driver change, this will break the ABI.
>
>    Affected: Serial on ExynosAutov9 SADK and out-of-tree ExynosAutov9 boards
>
>    Why: To properly and efficiently support the USI with new hierarchy
>    of USI-{serial,SPI,I2C} devicetree nodes.
>
>    Rationale:
>    Recently added serial and USI support was short-sighted and did not
>    allow to smooth support of other features (SPI and I2C). Adding
>    support for USI-SPI and USI-I2C would effect in code duplication.
>    Adding support for different USI versions (currently supported is
>    USIv2 but support for v1 is planned) would cause even more code
>    duplication and create a solution difficult to maintain.
>    Since USI-serial and ExynosAutov9 have been added recently, are
>    considered fresh development features and there are no supported
>    products using them, the code/solution is being refactored in
>    non-backwards compatible way.  The compatibility is not broken yet.
>    It will be when serial driver changes are accepted.
>    The ABI break was discussed with only known users of ExynosAutov9 and
>    received their permission.

Thanks a lot for the detailed description, very helpful!

I've applied pull requests 1 through 4, though it seems that once more
the automated emails did not go out.

I can't find the two defconfig patches you mentioned in the introductory
mail, neither in patchwork nor in my inbox, I assume these were
numbered 5/6 and 6/6?

        Arnd