linux-kernel - Re: [PATCH] arm64: dts: ensure backward compatibility of the AP807 Xenon

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Date:   Thu, 17 Jun 2021 15:49:55 +0200
From:   Marcin Wojtas <mw@...ihalf.com>
To:     Gregory CLEMENT <gregory.clement@...tlin.com>
Cc:     linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Andrew Lunn <andrew@...n.ch>, Rob Herring <robh+dt@...nel.org>
Subject: Re: [PATCH] arm64: dts: ensure backward compatibility of the AP807 Xenon

czw., 17 cze 2021 o 15:14 Gregory CLEMENT
<gregory.clement@...tlin.com> napisał(a):
>
> Hi Marcin,
>
> > A recent switch to a dedicated AP807 compatible string for the Xenon
> > SD/MMC controller result in the driver not being probed when
> > using updated device tree with the older kernel revisions.
> > It may also be problematic for other OSs/firmware that use
> > Linux device tree sources as a reference. Resolve the problem
> > with backward compatibility by restoring a previous compatible
> > string as secondary one.
> >
> > Signed-off-by: Marcin Wojtas <mw@...ihalf.com>
>
> Applied on mvebu/dt64
>

Thank you!
Marcin

>
> > ---
> >  arch/arm64/boot/dts/marvell/armada-ap807.dtsi | 3 ++-
> >  1 file changed, 2 insertions(+), 1 deletion(-)
> >
> > diff --git a/arch/arm64/boot/dts/marvell/armada-ap807.dtsi b/arch/arm64/boot/dts/marvell/armada-ap807.dtsi
> > index d9bbbfa4b4eb..4a23f65d475f 100644
> > --- a/arch/arm64/boot/dts/marvell/armada-ap807.dtsi
> > +++ b/arch/arm64/boot/dts/marvell/armada-ap807.dtsi
> > @@ -29,6 +29,7 @@ cpu_clk: clock-cpu {
> >  };
> >
> >  &ap_sdhci0 {
> > -     compatible = "marvell,armada-ap807-sdhci";
> > +     compatible = "marvell,armada-ap807-sdhci",
> > +                  "marvell,armada-ap806-sdhci"; /* Backward compatibility */
> >  };
> >
> > --
> > 2.29.0
> >
> >
> > _______________________________________________
> > linux-arm-kernel mailing list
> > linux-arm-kernel@...ts.infradead.org
> > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
>
> --
> Gregory Clement, Bootlin
> Embedded Linux and Kernel engineering
> http://bootlin.com

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