linux-kernel - Re: [PATCH 2/5] arm64: dts: exynos: gs101: fix usi8 default mode

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Message-ID: <CAPLW+4ka0Wmvt9h=rxxGacoBOCOisF=+p5_xYPmFgSYT0Ndehw@mail.gmail.com>
Date: Fri, 26 Jan 2024 21:05:18 -0600
From: Sam Protsenko <semen.protsenko@...aro.org>
To: André Draszik <andre.draszik@...aro.org>
Cc: peter.griffin@...aro.org, robh+dt@...nel.org, 
	krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org, 
	linux-kernel@...r.kernel.org, kernel-team@...roid.com, 
	tudor.ambarus@...aro.org, willmcvicker@...gle.com, alim.akhtar@...sung.com, 
	s.nawrocki@...sung.com, tomasz.figa@...il.com, cw00.choi@...sung.com, 
	mturquette@...libre.com, sboyd@...nel.org, 
	linux-arm-kernel@...ts.infradead.org, linux-samsung-soc@...r.kernel.org, 
	linux-clk@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH 2/5] arm64: dts: exynos: gs101: fix usi8 default mode

On Fri, Jan 26, 2024 at 6:37 PM André Draszik <andre.draszik@...aro.org> wrote:
>
> While commit 6d44d1a1fb62 ("arm64: dts: exynos: gs101: define USI8 with
> I2C configuration") states that the USI8 CONFIG is 0 at reset, the boot
> loader has configured it by the time Linux runs and it has a different
> value at this stage.
>
> Since we want board DTS files to explicitly select the mode, we should
> set it to none here so as to ensure things don't work by accident and
> to make it clear that board DTS actually need to set the mode based on
> the configuration.
>
> Fixes: 6d44d1a1fb62 ("arm64: dts: exynos: gs101: define USI8 with I2C configuration")
> Signed-off-by: André Draszik <andre.draszik@...aro.org>
> ---

Reviewed-by: Sam Protsenko <semen.protsenko@...aro.org>

>  arch/arm64/boot/dts/exynos/google/gs101.dtsi | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/arch/arm64/boot/dts/exynos/google/gs101.dtsi b/arch/arm64/boot/dts/exynos/google/gs101.dtsi
> index aaac04df5e65..bc251e565be6 100644
> --- a/arch/arm64/boot/dts/exynos/google/gs101.dtsi
> +++ b/arch/arm64/boot/dts/exynos/google/gs101.dtsi
> @@ -384,6 +384,7 @@ usi8: usi@...700c0 {
>                                  <&cmu_peric0 CLK_GOUT_PERIC0_PERIC0_TOP0_IPCLK_7>;
>                         clock-names = "pclk", "ipclk";
>                         samsung,sysreg = <&sysreg_peric0 0x101c>;
> +                       samsung,mode = <USI_V2_NONE>;
>                         status = "disabled";
>
>                         hsi2c_8: i2c@...70000 {
> --
> 2.43.0.429.g432eaa2c6b-goog
>