From mboxrd@z Thu Jan 1 00:00:00 1970 From: maxime.ripard@free-electrons.com (Maxime Ripard) Date: Mon, 22 Aug 2016 09:54:54 +0200 Subject: [PATCH v2 5/5] ARM: dts: sunxi: Use new sun7i-a20-mmc compatible on sun7i and newer In-Reply-To: <9b6ed836-27ff-c8c8-d886-d86c787605fc@arm.com> References: <1469888748-26085-1-git-send-email-hdegoede@redhat.com> <1469888748-26085-6-git-send-email-hdegoede@redhat.com> <9b6ed836-27ff-c8c8-d886-d86c787605fc@arm.com> Message-ID: <20160822075454.GB7104@lukather> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 > > --- > > 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 at 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 -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 819 bytes Desc: not available URL: