linux-kernel - Re: [PATCH] arm64: dts: stratix10: i2c clock running out of spec

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Message-ID: <dd109cc6-00a8-244b-07e9-97e29739d804@kernel.org>
Date:   Wed, 15 Aug 2018 10:08:24 -0500
From:   Dinh Nguyen <dinguyen@...nel.org>
To:     Alan Tull <atull@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>
Cc:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: stratix10: i2c clock running out of spec



On 08/08/2018 10:42 AM, Alan Tull wrote:
> DesignWare I2C controller was observed running at 105.93kHz rather
> than the specified 100kHz.  Adjust device tree settings to bring it
> within spec (a slightly conservative 98 MHz).
> 
> Signed-off-by: Alan Tull <atull@...nel.org>
> ---
>  arch/arm64/boot/dts/altera/socfpga_stratix10_socdk.dts | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/altera/socfpga_stratix10_socdk.dts b/arch/arm64/boot/dts/altera/socfpga_stratix10_socdk.dts
> index 6edc4fa..53cf195 100644
> --- a/arch/arm64/boot/dts/altera/socfpga_stratix10_socdk.dts
> +++ b/arch/arm64/boot/dts/altera/socfpga_stratix10_socdk.dts
> @@ -124,6 +124,8 @@
>  &i2c1 {
>  	status = "okay";
>  	clock-frequency = <100000>;
> +	i2c-sda-falling-time-ns = <890>;  /* hcnt */
> +	i2c-sdl-falling-time-ns = <890>;  /* lcnt */
>  
>  	adc@14 {
>  		compatible = "lltc,ltc2497";
> 

Applied!

Thanks,
Dinh