linux-kernel - Re: From a5f512cb01e48f5bfcdef800dd477c8b04a4cacf Mon Sep 17 00:00:00 2001

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Message-ID: <CAPLW+4mqqk0XfdvsyGLeUdqQssQss3-C4BB4iMRMVSSm8dOa4A@mail.gmail.com>
Date:   Sat, 4 Dec 2021 23:56:02 +0200
From:   Sam Protsenko <semen.protsenko@...aro.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Rob Herring <robh+dt@...nel.org>
Cc:     Jaewon Kim <jaewon02.kim@...sung.com>,
        Chanho Park <chanho61.park@...sung.com>,
        David Virag <virag.david003@...il.com>,
        Youngmin Nam <youngmin.nam@...sung.com>,
        Wolfram Sang <wsa@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        linux-i2c@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-samsung-soc@...r.kernel.org
Subject: Re: From a5f512cb01e48f5bfcdef800dd477c8b04a4cacf Mon Sep 17 00:00:00 2001

On Sat, 4 Dec 2021 at 23:50, Sam Protsenko <semen.protsenko@...aro.org> wrote:
>
> Modern ARM64 Samsung Exynos SoCs (like Exynos Auto V9 and Exynos850) use
> pretty much the same High-Speed I2C controller supported in i2c-exynos5
> driver ("samsung,exynos7-hsi2c" variant), but with some differences:
> - timings are now calculated and configured a bit differently
> - two clocks are now provided to HSI2C controller (and must be
> asserted during I2C operation and register access)
>
> This patch series implements these changes, making it possible to use
> HSI2C driver on modern Exynos SoCs.
>
> Another change in mentioned SoCs is that HSI2C controller is now a part
> of USIv2 IP-core. But no USI modifications are needed in HSI2C driver,
> as all USI related configuration is done in USI driver independently.
> USI driver is added in [1] series (or its later revision, if available).
> To make HSI2C functional, both patch series (this one and [1]) have to
> be applied, but those can be applied independently.
>
> Changes in v2:
> - Added new patches renaming "hsi2c@*" nodes to "i2c@*" for Exynos
> dts's
> - Added R-b tags from v1 review
> - Fixed and improved i2c-exynos5 dt-bindings
>
> [1] https://patchwork.kernel.org/project/linux-samsung-soc/cover/20211204195757.8600-1-semen.protsenko@linaro.org/
>
> Jaewon Kim (2):
>   dt-bindings: i2c: exynos5: Add exynosautov9-hsi2c compatible
>   i2c: exynos5: Add support for ExynosAutoV9 SoC
>
> Sam Protsenko (6):
>   dt-bindings: i2c: exynos5: Convert to dtschema
>   dt-bindings: i2c: exynos5: Add bus clock
>   i2c: exynos5: Add bus clock support
>   i2c: exynos5: Mention Exynos850 and ExynosAutoV9 in Kconfig
>   arm: dts: exynos: Rename hsi2c nodes to i2c for Exynos5260
>   arm64: dts: exynos: Rename hsi2c nodes to i2c for Exynos5433 and
>     Exynos7
>
>  .../devicetree/bindings/i2c/i2c-exynos5.txt   |  53 -------
>  .../devicetree/bindings/i2c/i2c-exynos5.yaml  | 133 ++++++++++++++++++
>  arch/arm/boot/dts/exynos5260.dtsi             |   8 +-
>  arch/arm64/boot/dts/exynos/exynos5433.dtsi    |  24 ++--
>  arch/arm64/boot/dts/exynos/exynos7.dtsi       |  24 ++--
>  drivers/i2c/busses/Kconfig                    |   2 +-
>  drivers/i2c/busses/i2c-exynos5.c              | 108 +++++++++++---
>  7 files changed, 253 insertions(+), 99 deletions(-)
>  delete mode 100644 Documentation/devicetree/bindings/i2c/i2c-exynos5.txt
>  create mode 100644 Documentation/devicetree/bindings/i2c/i2c-exynos5.yaml
>
> --

Please ignore this series, patch 0/8 was malformed for some reason.
I'll resend it soon, with [PATCH v2 RESEND] prefix.

> 2.30.2
>