On Mon, Aug 01, 2016 at 02:11:09PM +0100, Andre Przywara wrote:
> Hi Hans,
>
> On 30/07/16 15:25, Hans de Goede wrote:
> > Use the new sun7i-a20-mmc compatible for the mmc controllers on sun7i
> > and newer.
> >
> > Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
> > ---
> > Changes in v2:
> > -New patch in v2 of this patch-set
> > ---
> > arch/arm/boot/dts/sun6i-a31.dtsi | 8 ++++----
> > arch/arm/boot/dts/sun7i-a20.dtsi | 8 ++++----
> > arch/arm/boot/dts/sun8i-a23-a33.dtsi | 6 +++---
> > arch/arm/boot/dts/sun8i-h3.dtsi | 6 +++---
> > 4 files changed, 14 insertions(+), 14 deletions(-)
> >
> > diff --git a/arch/arm/boot/dts/sun6i-a31.dtsi b/arch/arm/boot/dts/sun6i-a31.dtsi
> > index 1867af2..0d24f10 100644
> > --- a/arch/arm/boot/dts/sun6i-a31.dtsi
> > +++ b/arch/arm/boot/dts/sun6i-a31.dtsi
> > @@ -469,7 +469,7 @@
> > };
> >
> > mmc0: mmc@01c0f000 {
> > - compatible = "allwinner,sun5i-a13-mmc";
> > + compatible = "allwinner,sun7i-a20-mmc";
>
> But that breaks systems with newer DTs on older kernels, which do not
> know about sun7i-a20-mmc.
That's not backward compatibility. That's the forward one, and that
has never been something we supported.
See https://www.kernel.org/doc/Documentation/devicetree/bindings/ABI.txt
Maxime
--
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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