linux-kernel - Re: [PATCH v3 3/4] powerpc/fsl: set fsl,i2c-erratum-a004447 flag for P1010 i2c controllers

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Message-ID: <871r9ui9y5.fsf@mpe.ellerman.id.au>
Date:   Wed, 26 May 2021 11:02:26 +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 3/4] powerpc/fsl: set fsl,i2c-erratum-a004447 flag
 for P1010 i2c controllers

Chris Packham <chris.packham@...iedtelesis.co.nz> writes:
> The i2c controllers on the P1010 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 P1010 Chip Errata Rev L.
>
> Signed-off-by: Chris Packham <chris.packham@...iedtelesis.co.nz>
> ---
>
> Notes:
>     Changes in v3:
>     - New
>
>  arch/powerpc/boot/dts/fsl/p1010si-post.dtsi | 8 ++++++++
>  1 file changed, 8 insertions(+)

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

cheers

> diff --git a/arch/powerpc/boot/dts/fsl/p1010si-post.dtsi b/arch/powerpc/boot/dts/fsl/p1010si-post.dtsi
> index c2717f31925a..ccda0a91abf0 100644
> --- a/arch/powerpc/boot/dts/fsl/p1010si-post.dtsi
> +++ b/arch/powerpc/boot/dts/fsl/p1010si-post.dtsi
> @@ -122,7 +122,15 @@ memory-controller@...0 {
>  	};
>  
>  /include/ "pq3-i2c-0.dtsi"
> +	i2c@...0 {
> +		fsl,i2c-erratum-a004447;
> +	};
> +
>  /include/ "pq3-i2c-1.dtsi"
> +	i2c@...0 {
> +		fsl,i2c-erratum-a004447;
> +	};
> +
>  /include/ "pq3-duart-0.dtsi"
>  /include/ "pq3-espi-0.dtsi"
>  	spi0: spi@...0 {
> -- 
> 2.31.1