linux-kernel - Re: [PATCH v3 2/4] arm64: tegra: Add Tegra234 I2C devicetree nodes

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Message-ID: <c323b734-b134-2dc0-cfa2-c9f63f1c3ad8@gmail.com>
Date:   Mon, 24 Jan 2022 19:48:46 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Akhil R <akhilrajeev@...dia.com>, devicetree@...r.kernel.org,
        jonathanh@...dia.com, ldewangan@...dia.com,
        linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-tegra@...r.kernel.org, mperttunen@...dia.com,
        robh+dt@...nel.org, thierry.reding@...il.com
Subject: Re: [PATCH v3 2/4] arm64: tegra: Add Tegra234 I2C devicetree nodes

24.01.2022 14:18, Akhil R пишет:
> Add device tree nodes for Tegra234 I2C controllers
> 
> Signed-off-by: Akhil R <akhilrajeev@...dia.com>
> ---
>  arch/arm64/boot/dts/nvidia/tegra234.dtsi | 121 +++++++++++++++++++++++++++++++
>  1 file changed, 121 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/nvidia/tegra234.dtsi b/arch/arm64/boot/dts/nvidia/tegra234.dtsi
> index 6b6f1580..c686827 100644
> --- a/arch/arm64/boot/dts/nvidia/tegra234.dtsi
> +++ b/arch/arm64/boot/dts/nvidia/tegra234.dtsi
> @@ -144,6 +144,96 @@
>  			status = "disabled";
>  		};
>  
> +		gen1_i2c: i2c@...0000 {
> +			compatible = "nvidia,tegra194-i2c";
> +			reg = <0x3160000 0x100>;
> +			status = "disabled";
> +			interrupts = <GIC_SPI 25 IRQ_TYPE_LEVEL_HIGH>;
> +			clock-frequency = <400000>;
> +			clocks = <&bpmp TEGRA234_CLK_I2C1
> +				  &bpmp TEGRA234_CLK_PLLP_OUT0>;
> +			assigned-clocks = <&bpmp TEGRA234_CLK_I2C1>;
> +			assigned-clock-parents = <&bpmp TEGRA234_CLK_PLLP_OUT0>;
> +			clock-names = "div-clk", "parent";
> +			resets = <&bpmp TEGRA234_RESET_I2C1>;
> +			reset-names = "i2c";
> +		};

The patchset looks okay to me, thank you. I've one question:

Could you please explain why the "PLLP" I2C timing configuration that is
specified in the "example" section of Tegra TRM isn't suitable for
T194/234? Why I2C Tegra kernel driver uses a different configuration?