linux-kernel - Re: [PATCH v6] ARM: dts: wheat: Fix ADV7513 address usage

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Message-ID: <20180323085140.g3golwdtpezo7fhi@verge.net.au>
Date:   Fri, 23 Mar 2018 09:51:40 +0100
From:   Simon Horman <horms@...ge.net.au>
To:     Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
Cc:     linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-renesas-soc@...r.kernel.org,
        Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Magnus Damm <magnus.damm@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Russell King <linux@...linux.org.uk>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "moderated list:ARM PORT" <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v6] ARM: dts: wheat: Fix ADV7513 address usage

On Thu, Mar 22, 2018 at 09:30:40PM +0000, Kieran Bingham wrote:
> The r8a7792 Wheat board has two ADV7513 devices sharing a single I2C
> bus, however in low power mode the ADV7513 will reset it's slave maps to
> use the hardware defined default addresses.
> 
> The ADV7511 driver was adapted to allow the two devices to be registered
> correctly - but it did not take into account the fault whereby the
> devices reset the addresses.
> 
> This results in an address conflict between the device using the default
> addresses, and the other device if it is in low-power-mode.
> 
> Repair this issue by moving both devices away from the default address
> definitions.

Hi Kierean,

as this is a fix
a) Does it warrant a fixes tag?
   Fixes: f6eea82a87db ("ARM: dts: wheat: add DU support")
b) Does it warrant being posted as a fix for v4.16;
c) or v4.17?