linux-kernel - Re: [PATCH] ARM: dts: am3874-iceboard: Fix 'i2c-mux-idle-disconnect' usage

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Date:   Fri, 4 Oct 2019 16:52:23 -0700
From:   Graeme Smecher <gsmecher@...eespeedlogic.com>
To:     Andrey Smirnov <andrew.smirnov@...il.com>,
        linux-omap@...r.kernel.org
Cc:     Benoît Cousson <bcousson@...libre.com>,
        Tony Lindgren <tony@...mide.com>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: dts: am3874-iceboard: Fix 'i2c-mux-idle-disconnect'
 usage

Hi Andrey,

On 2019-10-03 6:45 p.m., Andrey Smirnov wrote:
> According to
> Documentation/devicetree/bindings/i2c/i2c-mux-pca954x.txt,
> i2c-mux-idle-disconnect is a property of a parent node since it
> pertains to the mux/switch as a whole, so move it there and drop all
> of the concurrences in child nodes.
> 
> Fixes: d031773169df ("ARM: dts: Adds device tree file for McGill's IceBoard, based on TI AM3874")
> Signed-off-by: Andrey Smirnov <andrew.smirnov@...il.com>
> Cc: Benoît Cousson <bcousson@...libre.com>
> Cc: Tony Lindgren <tony@...mide.com>
> Cc: Graeme Smecher <gsmecher@...eespeedlogic.com>
> Cc: linux-omap@...r.kernel.org
> Cc: devicetree@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> ---
> 
> This is purely a drive-by fix, since it concerns the HW I've never
> heard of before. However I was working with PCA9548
> (vf610-zii-scu4-aib is my HW) and looking at various users in the
> kernel, when this code caught my eye. Apologies for the noise if this
> fix is somehow bogus.
> 
> In case that it matters this patch is based on top of 5.4-rc1.

Thanks! We do have I2C address collisions on downstream bus segments, so
keeping these segments isolated is important. I'm surprised this patch
was necessary and happy to see it.

Lightly tested on 5.3.

Tested-by: Graeme Smecher <gsmecher@...eespeedlogic.com>

cheers,
Graeme

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