linux-kernel - Re: [PATCH 2/2] arm64: defconfig: Enable Samsung I2C driver

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Message-ID: <CAPLW+4=RMfTmLnOiC+=rAB1c0+rTqpqDpc-1UO+0BOmP3+0Z_Q@mail.gmail.com>
Date:   Mon, 8 Nov 2021 17:12:44 +0200
From:   Sam Protsenko <semen.protsenko@...aro.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Will McVicker <willmcvicker@...gle.com>,
        Russell King <linux@...linux.org.uk>,
        Arnd Bergmann <arnd@...db.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Michael Ellerman <mpe@...erman.id.au>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-samsung-soc@...r.kernel.org, linux-i2c@...r.kernel.org
Subject: Re: [PATCH 2/2] arm64: defconfig: Enable Samsung I2C driver

On Mon, 8 Nov 2021 at 16:18, Krzysztof Kozlowski
<krzysztof.kozlowski@...onical.com> wrote:
>
> On 08/11/2021 14:49, Sam Protsenko wrote:
> > i2c-s3c2410 driver is needed for some arm64 Exynos SoCs, e.g. Exynos850.
> >
> > Signed-off-by: Sam Protsenko <semen.protsenko@...aro.org>
> > ---
> >  arch/arm64/configs/defconfig | 1 +
> >  1 file changed, 1 insertion(+)
>
> Hm, that's a little bit unexpected. I thought you will be also using the
> HSI2C driver (where Jaewon is adding USI support).
>

Thought you'd ask :) Exynos850 has both I2C and HSI2C blocks:
  - I2C is a regular I2C, and uses s3c2410-i2c driver
  - whilst HSI2C is a high-speed I2C (used for example for cameras),
and uses exynos5-hsi2c driver

I'll look into HSI2C enablement on Exynos850 soon as well, so Jaewon's
patches might be helpful for my case too -- didn't check that yet.

> Best regards,
> Krzysztof