linux-kernel - Re: [PATCH v3 2/4] powerpc/fsl: set fsl,i2c-erratum-a004447 flag for P2041 i2c controllers

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Message-ID: <874keqi9yq.fsf@mpe.ellerman.id.au>
Date:   Wed, 26 May 2021 11:02:05 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Chris Packham <chris.packham@...iedtelesis.co.nz>, wsa@...nel.org,
        andriy.shevchenko@...ux.intel.com, andy.shevchenko@...il.com,
        robh+dt@...nel.org
Cc:     linux-i2c@...r.kernel.org, devicetree@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        Chris Packham <chris.packham@...iedtelesis.co.nz>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>
Subject: Re: [PATCH v3 2/4] powerpc/fsl: set fsl,i2c-erratum-a004447 flag
 for P2041 i2c controllers

Chris Packham <chris.packham@...iedtelesis.co.nz> writes:
> The i2c controllers on the P2040/P2041 have an erratum where the
> documented scheme for i2c bus recovery will not work (A-004447). A
> different mechanism is needed which is documented in the P2040 Chip
> Errata Rev Q (latest available at the time of writing).
>
> Signed-off-by: Chris Packham <chris.packham@...iedtelesis.co.nz>
> ---
>  arch/powerpc/boot/dts/fsl/p2041si-post.dtsi | 16 ++++++++++++++++
>  1 file changed, 16 insertions(+)

Acked-by: Michael Ellerman <mpe@...erman.id.au>

cheers

> diff --git a/arch/powerpc/boot/dts/fsl/p2041si-post.dtsi b/arch/powerpc/boot/dts/fsl/p2041si-post.dtsi
> index 872e4485dc3f..ddc018d42252 100644
> --- a/arch/powerpc/boot/dts/fsl/p2041si-post.dtsi
> +++ b/arch/powerpc/boot/dts/fsl/p2041si-post.dtsi
> @@ -371,7 +371,23 @@ sdhc@...000 {
>  	};
>  
>  /include/ "qoriq-i2c-0.dtsi"
> +	i2c@...000 {
> +		fsl,i2c-erratum-a004447;
> +	};
> +
> +	i2c@...100 {
> +		fsl,i2c-erratum-a004447;
> +	};
> +
>  /include/ "qoriq-i2c-1.dtsi"
> +	i2c@...000 {
> +		fsl,i2c-erratum-a004447;
> +	};
> +
> +	i2c@...100 {
> +		fsl,i2c-erratum-a004447;
> +	};
> +
>  /include/ "qoriq-duart-0.dtsi"
>  /include/ "qoriq-duart-1.dtsi"
>  /include/ "qoriq-gpio-0.dtsi"
> -- 
> 2.31.1