linux-kernel - Re: [PATCH 19/22] soc: sunxi: mbus: Add A31 ISP compatibles to the list

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Date:   Mon, 13 Sep 2021 10:32:48 +0200
From:   Maxime Ripard <maxime@...no.tech>
To:     Paul Kocialkowski <paul.kocialkowski@...tlin.com>
Cc:     Samuel Holland <samuel@...lland.org>,
        Yong Deng <yong.deng@...ewell.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Helen Koike <helen.koike@...labora.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
        linux-kernel@...r.kernel.org, linux-phy@...ts.infradead.org,
        linux-clk@...r.kernel.org, linux-staging@...ts.linux.dev
Subject: Re: [PATCH 19/22] soc: sunxi: mbus: Add A31 ISP compatibles to the
 list

On Mon, Sep 13, 2021 at 09:45:22AM +0200, Paul Kocialkowski wrote:
> Hi Samuel,
> 
> On Fri 10 Sep 21, 21:36, Samuel Holland wrote:
> > On 9/10/21 1:41 PM, Paul Kocialkowski wrote:
> > > The A31 ISP sits on the mbus and requires the usual bus address
> > > adaptation. Add its compatibles to the list.
> > 
> > My understanding is that this driver only exists to work around old DT
> > bindings where the interconnects/interconnect-names = "dma-mem"
> > properties are not required (and so they are historically missing from
> > the device trees).
> > 
> > For new bindings, it would be better to use those properties and not add
> > to this list.
> 
> Oh okay, I didn't really look into it and just did the same thing that was
> done for the CSI controller. Thanks for the heads up!

This code was done to maintain backward compatibility. New DT should
indeed use the interconnects property.

Maxime

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