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[211.20.114.70]) by smtp.googlemail.com with ESMTPSA id 14sm22026759pfj.36.2019.06.25.03.43.00 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Tue, 25 Jun 2019 03:43:03 -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 Cc: sudheer veliseti , linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org, devicetree@vger.kernel.org, linux-aspeed@lists.ozlabs.org Subject: [patch v3 3/5] DT nodes for AST2500 DMA UART driver Date: Tue, 25 Jun 2019 16:14:34 +0530 Message-Id: <1561459476-14268-4-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> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: sudheer veliseti DT node for DMA controller(ast_uart_sdma) doesn't bind to any DMA controller driver. This is because Software for DMA controller is not based on DMA framework,but is dedicated and serves only UARTs in AST2500. ast_uart_sdma node is searched by compatible string in the driver software.basic use of this node is to provide register base address of DMA controller and DMA irq number(<50>). IRQ of DMA controller is of crucial importance, which does RX and TX of UART data. uart nodes dma_uart1,2...etc binds to the platform driver. irq numbers <9>,<32>,<33>,<34> in dma_uart nodes install ISRs which are of not much interest in uart data TX/RX . Signed-off-by: sudheer veliseti --- changes in v3: - change logs added arch/arm/boot/dts/aspeed-ast2500-evb.dts | 21 +++++++ arch/arm/boot/dts/aspeed-g5.dtsi | 71 ++++++++++++++++++++++-- 2 files changed, 88 insertions(+), 4 deletions(-) diff --git a/arch/arm/boot/dts/aspeed-ast2500-evb.dts b/arch/arm/boot/dts/aspeed-ast2500-evb.dts index 5dbb33c10c4f..4da09fbe94df 100644 --- a/arch/arm/boot/dts/aspeed-ast2500-evb.dts +++ b/arch/arm/boot/dts/aspeed-ast2500-evb.dts @@ -64,6 +64,27 @@ status = "okay"; }; +&ast_uart_sdma { + status = "okay"; +}; + +&dma_uart1 { + status = "okay"; +}; + +&dma_uart2 { + status = "okay"; +}; + +&dma_uart3 { + status = "okay"; +}; + +&dma_uart4 { + status = "okay"; +}; + + &mac0 { status = "okay"; diff --git a/arch/arm/boot/dts/aspeed-g5.dtsi b/arch/arm/boot/dts/aspeed-g5.dtsi index 674746513031..fb7b3ed463de 100644 --- a/arch/arm/boot/dts/aspeed-g5.dtsi +++ b/arch/arm/boot/dts/aspeed-g5.dtsi @@ -23,10 +23,10 @@ i2c11 = &i2c11; i2c12 = &i2c12; i2c13 = &i2c13; - serial0 = &uart1; - serial1 = &uart2; - serial2 = &uart3; - serial3 = &uart4; + serial0 = &dma_uart1; + serial1 = &dma_uart2; + serial2 = &dma_uart3; + serial3 = &dma_uart4; serial4 = &uart5; serial5 = &vuart; peci0 = &peci0; @@ -497,6 +497,69 @@ status = "disabled"; }; + ast_uart_sdma: uart_sdma@1e79e000 { + compatible = "aspeed,ast-uart-sdma"; + reg = <0x1e79e000 0x400>; + interrupts = <50>; + status = "disabled"; + }; + + 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"; + }; + + dma_uart2: dma_uart2@1e78d000{ + compatible = "aspeed,ast-sdma-uart"; + reg = <0x1e78d000 0x1000>; + reg-shift = <2>; + interrupts = <32>; + clocks = <&syscon ASPEED_CLK_GATE_UART2CLK>; + dma-channel = <1>; + no-loopback-test; + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_txd2_default + &pinctrl_rxd2_default>; + status = "disabled"; + }; + + dma_uart3: dma_uart3@1e78e000{ + compatible = "aspeed,ast-sdma-uart"; + reg = <0x1e78e000 0x1000>; + reg-shift = <2>; + interrupts = <33>; + clocks = <&syscon ASPEED_CLK_GATE_UART3CLK>; + dma-channel = <2>; + no-loopback-test; + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_txd3_default + &pinctrl_rxd3_default>; + status = "disabled"; + }; + + dma_uart4: dma_uart4@1e78f000{ + compatible = "aspeed,ast-sdma-uart"; + reg = <0x1e78f000 0x1000>; + reg-shift = <2>; + interrupts = <34>; + clocks = <&syscon ASPEED_CLK_GATE_UART4CLK>; + dma-channel = <3>; + no-loopback-test; + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_txd4_default + &pinctrl_rxd4_default>; + status = "disabled"; + }; + i2c: bus@1e78a000 { compatible = "simple-bus"; #address-cells = <1>; -- 2.17.1