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[211.20.114.70]) by smtp.googlemail.com with ESMTPSA id 14sm22026759pfj.36.2019.06.25.03.43.13 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Tue, 25 Jun 2019 03:43:15 -0700 (PDT) From: "sudheer.v" To: gregkh@linuxfoundation.org, jslaby@suse.com, joel@jms.id.au, andrew@aj.id.au, benh@kernel.crashing.org, robh+dt@kernel.org, mark.rutland@arm.com, shivahshankar.shankarnarayanrao@aspeedtech.com, shivahshankar@gmail.com, sudheer.veliseti@aspeedtech.com Subject: [patch v3 5/5] Documentation: DT bindings AST2500 DMA UART driver Date: Tue, 25 Jun 2019 16:14:36 +0530 Message-Id: <1561459476-14268-6-git-send-email-open.sudheer@gmail.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1561459476-14268-1-git-send-email-open.sudheer@gmail.com> References: <1561459476-14268-1-git-send-email-open.sudheer@gmail.com> X-BeenThere: linux-aspeed@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux ASPEED SoC development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, linux-aspeed@lists.ozlabs.org, linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org, sudheer veliseti Errors-To: linux-aspeed-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Linux-aspeed" From: sudheer veliseti documentation for Dt bindings for DMA based UARTs in AST2500 Signed-off-by: sudheer veliseti --- Changes in v3: - change logs added .../bindings/serial/ast2500-dma-uart.txt | 40 +++++++++++++++++++ 1 file changed, 40 insertions(+) create mode 100644 Documentation/devicetree/bindings/serial/ast2500-dma-uart.txt diff --git a/Documentation/devicetree/bindings/serial/ast2500-dma-uart.txt b/Documentation/devicetree/bindings/serial/ast2500-dma-uart.txt new file mode 100644 index 000000000000..6f01ddecba56 --- /dev/null +++ b/Documentation/devicetree/bindings/serial/ast2500-dma-uart.txt @@ -0,0 +1,40 @@ + +node for DMA controller: + ast_uart_sdma: uart_sdma@1e79e000 { + compatible = "aspeed,ast-uart-sdma"; + reg = <0x1e79e000 0x400>; + interrupts = <50>; + status = "disabled"; + }; +this node doesn't binds with any driver. +DMA controller is handled as a separate SW layer,and is included in the same driver. +This DMA controller node is included in DT just for Register base and interrupt details + + + +node for DMA-UART : + + +Required properties: + +- compatible: "aspeed,ast-sdma-uart" +- reg: The base address of the UART register bank +- interrupts: should contain interrupt specifier. +- clocks: Clock driving the hardware; +- pinctrl-0 : list of pinconfigurations +- dma-channel: channel of DMA-controller which is used + +Example: + + dma_uart1: dma_uart1@1e783000{ + compatible = "aspeed,ast-sdma-uart"; + reg = <0x1e783000 0x1000>; + reg-shift = <2>; + interrupts = <9>; + clocks = <&syscon ASPEED_CLK_GATE_UART1CLK>; + dma-channel = <0>; + no-loopback-test; + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_txd1_default &pinctrl_rxd1_default>; + status = "disabled"; + };