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Tue, 22 Sep 2020 16:33:29 -0700 (PDT) Received: from xps15 ([64.188.179.253]) by smtp.gmail.com with ESMTPSA id c12sm9930706ili.48.2020.09.22.16.33.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 22 Sep 2020 16:33:28 -0700 (PDT) Received: (nullmailer pid 3476406 invoked by uid 1000); Tue, 22 Sep 2020 23:33:27 -0000 Date: Tue, 22 Sep 2020 17:33:27 -0600 From: Rob Herring To: Eugen Hristev Subject: Re: [PATCH 6/7] dt-bindings: dmaengine: at_xdmac: add optional microchip,m2m property Message-ID: <20200922233327.GA3474555@bogus> References: <20200914140956.221432-1-eugen.hristev@microchip.com> <20200914140956.221432-7-eugen.hristev@microchip.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200914140956.221432-7-eugen.hristev@microchip.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200922_193329_817265_F9411F42 X-CRM114-Status: GOOD ( 17.36 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, tudor.ambarus@microchip.com, ludovic.desroches@microchip.com, linux-kernel@vger.kernel.org, vkoul@kernel.org, dmaengine@vger.kernel.org, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Mon, Sep 14, 2020 at 05:09:55PM +0300, Eugen Hristev wrote: > Add optional microchip,m2m property that specifies if a controller is > dedicated to memory to memory operations only. > > Signed-off-by: Eugen Hristev > --- > Documentation/devicetree/bindings/dma/atmel-xdma.txt | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/Documentation/devicetree/bindings/dma/atmel-xdma.txt b/Documentation/devicetree/bindings/dma/atmel-xdma.txt > index 510b7f25ba24..642da6b95a29 100644 > --- a/Documentation/devicetree/bindings/dma/atmel-xdma.txt > +++ b/Documentation/devicetree/bindings/dma/atmel-xdma.txt > @@ -15,6 +15,12 @@ the dmas property of client devices. > interface identifier, > - bit 30-24: PERID, peripheral identifier. > > +Optional properties: > +- microchip,m2m: this controller is connected on AXI only to memory and it's > + dedicated to memory to memory DMA operations. If this option is > + missing, it's assumed that the DMA controller is connected to > + peripherals, thus it's a per2mem and mem2per. Wouldn't 'dma-requests = <0>' cover this case? Rob _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel