linux-kernel - Re: [PATCH v2 2/2] ARM: dts: at91: disable the nxp,se97b SMBUS timeout on the TSE-850

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Date:   Wed, 29 Nov 2017 12:53:11 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Peter Rosin <peda@...ntia.se>
Cc:     linux-kernel@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
        Russell King <linux@...linux.org.uk>,
        Jean Delvare <jdelvare@...e.com>,
        Ludovic Desroches <ludovic.desroches@...rochip.com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-hwmon@...r.kernel.org
Subject: Re: [PATCH v2 2/2] ARM: dts: at91: disable the nxp,se97b SMBUS
 timeout on the TSE-850

On Mon, Nov 27, 2017 at 05:31:01PM +0100, Peter Rosin wrote:
> The I2C adapter driver is sometimes slow, causing the SCL line to
> be stuck low for more than the stipulated SMBUS timeout of 25-35 ms.
> This causes the client device to give up which in turn causes silent
> corruption of data. So, disable the SMBUS timeout in the client device.
> 
> Signed-off-by: Peter Rosin <peda@...ntia.se>

Acked-by: Guenter Roeck <linux@...ck-us.net>

I assume this will be sent upstream through an arm tree.

Thanks,
Guenter

> ---
>  arch/arm/boot/dts/at91-tse850-3.dts | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/arm/boot/dts/at91-tse850-3.dts b/arch/arm/boot/dts/at91-tse850-3.dts
> index 5f29010cdbd8..9b82cc8843e1 100644
> --- a/arch/arm/boot/dts/at91-tse850-3.dts
> +++ b/arch/arm/boot/dts/at91-tse850-3.dts
> @@ -221,6 +221,7 @@
>  	jc42@18 {
>  		compatible = "nxp,se97b", "jedec,jc-42.4-temp";
>  		reg = <0x18>;
> +		smbus-timeout-disable;
>  	};
>  
>  	dpot: mcp4651-104@28 {
> -- 
> 2.11.0
>