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Stavinskii" , dmaengine@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, sophgo@lists.linux.dev, linux-riscv@lists.infradead.org, Yixun Lan Subject: Re: [PATCH v6 1/2] dt-bindings: dma: snps,dw-axi-dmac: Add fallback compatible for CV1800B Message-ID: References: <20260511063818.463877-1-inochiama@gmail.com> <20260511063818.463877-2-inochiama@gmail.com> <20260511-crave-sworn-3b43371ce11a@spud> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260511-crave-sworn-3b43371ce11a@spud> On Mon, May 11, 2026 at 05:01:01PM +0100, Conor Dooley wrote: > On Mon, May 11, 2026 at 02:38:16PM +0800, Inochi Amaoto wrote: > > The previous version of the binding change only add compatible > > string without adding the fallback compatible, this breaks > > backward compatibility. Add the needed fallback compatible to > > fix this. > > I don't understand how adding a specific comaptible affected backwards > compatibility. Did the dts originally use the snps compatible before the > device specific one was added? > Yes, the device is already in DTS, and since I find an quirk for it. A new compatible with fallback is necessary. Regards, Inochi > > > > Fixes: be3e2a0419c6 ("dt-bindings: dma: snps,dw-axi-dmac: Add CV1800B compatible") > > Signed-off-by: Inochi Amaoto > > --- > > Documentation/devicetree/bindings/dma/snps,dw-axi-dmac.yaml | 5 +++-- > > 1 file changed, 3 insertions(+), 2 deletions(-) > > > > diff --git a/Documentation/devicetree/bindings/dma/snps,dw-axi-dmac.yaml b/Documentation/devicetree/bindings/dma/snps,dw-axi-dmac.yaml > > index 804514732dbe..0a30a455b0ee 100644 > > --- a/Documentation/devicetree/bindings/dma/snps,dw-axi-dmac.yaml > > +++ b/Documentation/devicetree/bindings/dma/snps,dw-axi-dmac.yaml > > @@ -21,11 +21,12 @@ properties: > > - enum: > > - snps,axi-dma-1.01a > > - intel,kmb-axi-dma > > - - sophgo,cv1800b-axi-dma > > - starfive,jh7110-axi-dma > > - starfive,jh8100-axi-dma > > - items: > > - - const: altr,agilex5-axi-dma > > + - enum: > > + - altr,agilex5-axi-dma > > + - sophgo,cv1800b-axi-dma > > - const: snps,axi-dma-1.01a > > > > reg: > > -- > > 2.54.0 > >