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[188.155.176.92]) by smtp.gmail.com with ESMTPSA id s6-20020a1709062ec600b00711d88ae162sm7496130eji.24.2022.06.29.01.40.14 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 29 Jun 2022 01:40:15 -0700 (PDT) Message-ID: Date: Wed, 29 Jun 2022 10:40:14 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.10.0 Subject: Re: [PATCH 2/3] arm64: dts: exynosautov9: add exynosautov9-usi.dtsi Content-Language: en-US To: Chanho Park , Krzysztof Kozlowski , Rob Herring Cc: Alim Akhtar , Sam Protsenko , Jaewon Kim , devicetree@vger.kernel.org, linux-samsung-soc@vger.kernel.org, linux-arm-kernel@lists.infradead.org References: <20220629015650.138527-1-chanho61.park@samsung.com> <20220629015650.138527-3-chanho61.park@samsung.com> From: Krzysztof Kozlowski In-Reply-To: <20220629015650.138527-3-chanho61.park@samsung.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org On 29/06/2022 03:56, Chanho Park wrote: > Universal Serial Interface (USI) supports three types of serial interface > such as Universal Asynchronous Receiver and Transmitter (UART), Serial > Peripheral Interface (SPI), and Inter-Integrated Circuit (I2C). > Each protocols can be working independently and configured as one of > those using external configuration inputs. > Exynos Auto v9 SoC support 12 USIs. When a USI uses two pins such as i2c > and 3 wire uarts(RX/TX only), we can use remain two pins as i2c mode. > So, we can define one USI node that includes serial/spi and hsi2c. > usi_i2c nodes can be used only for i2c mode. > > We can have below combinations for one USI. > 1) The usi node is used either 4 pin uart or 4 pin spi > -> No usi_i2c can be used > 2) The usi node is used 2 pin uart(RX/TX) and i2c(SDA/SCL) > -> usi_i2c should be enabled to use the latter i2c > 3) The usi node is used i2c(SDA/SCL) and i2c(SDA/SCL) > -> usi_i2c should be enabled to use the latter i2c > > By default, all USIs are initially set to uart mode by below setting. > samsung,mode = ; > You can change it either USI_V2_SPI or USI_V2_I2C. > > Signed-off-by: Chanho Park > --- > .../boot/dts/exynos/exynosautov9-usi.dtsi | 1127 +++++++++++++++++ > 1 file changed, 1127 insertions(+) > create mode 100644 arch/arm64/boot/dts/exynos/exynosautov9-usi.dtsi Put all this directly in exynosautov9.dtsi, because this is not a re-usable piece among different DTSI. > > diff --git a/arch/arm64/boot/dts/exynos/exynosautov9-usi.dtsi b/arch/arm64/boot/dts/exynos/exynosautov9-usi.dtsi > new file mode 100644 > index 000000000000..0e4c6332770b > --- /dev/null > +++ b/arch/arm64/boot/dts/exynos/exynosautov9-usi.dtsi > @@ -0,0 +1,1127 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * Samsung's ExynosAutov9 SoC USI device tree source > + * > + * Copyright (c) 2022 Samsung Electronics Co., Ltd. > + * > + * Samsung's ExynosAutov9 SoC USI(Universal Serial Interface, uart/spi/i2c) > + * are listed as device tree nodes in this file. > + */ > + > +/* PERIC0 USIs */ > +&soc { > + syscon_peric0: syscon@10220000 { > + compatible = "samsung,exynosautov9-sysreg", "syscon"; > + reg = <0x10220000 0x2000>; > + }; > + > + usi_0: usi@103000c0 { > + compatible = "samsung,exynos850-usi"; We should start adding dedicated compatible, so: "samsung,exynosautov9-usi", "samsung,exynos850-usi" > + reg = <0x103000c0 0x20>; > + samsung,sysreg = <&syscon_peric0 0x1000>; > + samsung,mode = ; > + #address-cells = <1>; > + #size-cells = <1>; > + ranges; > + clocks = <&cmu_peric0 CLK_GOUT_PERIC0_PCLK_0>, > + <&cmu_peric0 CLK_GOUT_PERIC0_IPCLK_0>; > + clock-names = "pclk", "ipclk"; > + status = "disabled"; > + > + /* USI: UART */ Skip the comments, they are obvious from device node name. Long time ago I was not advocating this, but I see it's benefits - much easier to introduce changes to DTS or binding in case of some differences. > + serial_0: serial@10300000 { > + compatible = "samsung,exynos850-uart"; Here as well. > + reg = <0x10300000 0xc0>; > + interrupts = ; > + pinctrl-names = "default"; > + pinctrl-0 = <&uart0_bus>; > + clocks = <&cmu_peric0 CLK_GOUT_PERIC0_PCLK_0>, > + <&cmu_peric0 CLK_GOUT_PERIC0_IPCLK_0>; > + clock-names = "uart", "clk_uart_baud0"; > + samsung,uart-fifosize = <256>; > + status = "disabled"; > + }; > + > + /* USI: SPI */ > + spi_0: spi@10300000 { > + compatible = "samsung,exynosautov9-spi"; > + reg = <0x10300000 0x30>; > + interrupts = ; > + pinctrl-names = "default"; > + pinctrl-0 = <&spi0_bus &spi0_cs_func>; > + clocks = <&cmu_peric0 CLK_GOUT_PERIC0_IPCLK_0>, > + <&cmu_peric0 CLK_DOUT_PERIC0_USI00_USI>, > + <&cmu_peric0 CLK_GOUT_PERIC0_PCLK_0>; > + clock-names = "spi", "spi_busclk0", "spi_ioclk"; > + samsung,spi-src-clk = <0>; > + dmas = <&pdma0 1 &pdma0 0>; These are two separate phandles <>, not one. > + dma-names = "tx", "rx"; > + num-cs = <1>; > + #address-cells = <1>; > + #size-cells = <0>; > + status = "disabled"; > + }; > + > + /* USI: I2C */ > + hsi2c_0: hsi2c@10300000 { > + compatible = "samsung,exynosautov9-hsi2c"; > + reg = <0x10300000 0xc0>; > + interrupts = ; > + pinctrl-names = "default"; > + pinctrl-0 = <&hsi2c0_bus>; > + clocks = <&cmu_peric0 CLK_GOUT_PERIC0_IPCLK_0>, > + <&cmu_peric0 CLK_GOUT_PERIC0_PCLK_0>; > + clock-names = "hsi2c", "hsi2c_pclk"; > + #address-cells = <1>; > + #size-cells = <0>; > + status = "disabled"; > + }; > + }; Best regards, Krzysztof From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 4E4DEC433EF for ; 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[188.155.176.92]) by smtp.gmail.com with ESMTPSA id s6-20020a1709062ec600b00711d88ae162sm7496130eji.24.2022.06.29.01.40.14 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 29 Jun 2022 01:40:15 -0700 (PDT) Message-ID: Date: Wed, 29 Jun 2022 10:40:14 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.10.0 Subject: Re: [PATCH 2/3] arm64: dts: exynosautov9: add exynosautov9-usi.dtsi Content-Language: en-US To: Chanho Park , Krzysztof Kozlowski , Rob Herring Cc: Alim Akhtar , Sam Protsenko , Jaewon Kim , devicetree@vger.kernel.org, linux-samsung-soc@vger.kernel.org, linux-arm-kernel@lists.infradead.org References: <20220629015650.138527-1-chanho61.park@samsung.com> <20220629015650.138527-3-chanho61.park@samsung.com> From: Krzysztof Kozlowski In-Reply-To: <20220629015650.138527-3-chanho61.park@samsung.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220629_014018_107440_9B596CD1 X-CRM114-Status: GOOD ( 23.24 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , 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 29/06/2022 03:56, Chanho Park wrote: > Universal Serial Interface (USI) supports three types of serial interface > such as Universal Asynchronous Receiver and Transmitter (UART), Serial > Peripheral Interface (SPI), and Inter-Integrated Circuit (I2C). > Each protocols can be working independently and configured as one of > those using external configuration inputs. > Exynos Auto v9 SoC support 12 USIs. When a USI uses two pins such as i2c > and 3 wire uarts(RX/TX only), we can use remain two pins as i2c mode. > So, we can define one USI node that includes serial/spi and hsi2c. > usi_i2c nodes can be used only for i2c mode. > > We can have below combinations for one USI. > 1) The usi node is used either 4 pin uart or 4 pin spi > -> No usi_i2c can be used > 2) The usi node is used 2 pin uart(RX/TX) and i2c(SDA/SCL) > -> usi_i2c should be enabled to use the latter i2c > 3) The usi node is used i2c(SDA/SCL) and i2c(SDA/SCL) > -> usi_i2c should be enabled to use the latter i2c > > By default, all USIs are initially set to uart mode by below setting. > samsung,mode = ; > You can change it either USI_V2_SPI or USI_V2_I2C. > > Signed-off-by: Chanho Park > --- > .../boot/dts/exynos/exynosautov9-usi.dtsi | 1127 +++++++++++++++++ > 1 file changed, 1127 insertions(+) > create mode 100644 arch/arm64/boot/dts/exynos/exynosautov9-usi.dtsi Put all this directly in exynosautov9.dtsi, because this is not a re-usable piece among different DTSI. > > diff --git a/arch/arm64/boot/dts/exynos/exynosautov9-usi.dtsi b/arch/arm64/boot/dts/exynos/exynosautov9-usi.dtsi > new file mode 100644 > index 000000000000..0e4c6332770b > --- /dev/null > +++ b/arch/arm64/boot/dts/exynos/exynosautov9-usi.dtsi > @@ -0,0 +1,1127 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * Samsung's ExynosAutov9 SoC USI device tree source > + * > + * Copyright (c) 2022 Samsung Electronics Co., Ltd. > + * > + * Samsung's ExynosAutov9 SoC USI(Universal Serial Interface, uart/spi/i2c) > + * are listed as device tree nodes in this file. > + */ > + > +/* PERIC0 USIs */ > +&soc { > + syscon_peric0: syscon@10220000 { > + compatible = "samsung,exynosautov9-sysreg", "syscon"; > + reg = <0x10220000 0x2000>; > + }; > + > + usi_0: usi@103000c0 { > + compatible = "samsung,exynos850-usi"; We should start adding dedicated compatible, so: "samsung,exynosautov9-usi", "samsung,exynos850-usi" > + reg = <0x103000c0 0x20>; > + samsung,sysreg = <&syscon_peric0 0x1000>; > + samsung,mode = ; > + #address-cells = <1>; > + #size-cells = <1>; > + ranges; > + clocks = <&cmu_peric0 CLK_GOUT_PERIC0_PCLK_0>, > + <&cmu_peric0 CLK_GOUT_PERIC0_IPCLK_0>; > + clock-names = "pclk", "ipclk"; > + status = "disabled"; > + > + /* USI: UART */ Skip the comments, they are obvious from device node name. Long time ago I was not advocating this, but I see it's benefits - much easier to introduce changes to DTS or binding in case of some differences. > + serial_0: serial@10300000 { > + compatible = "samsung,exynos850-uart"; Here as well. > + reg = <0x10300000 0xc0>; > + interrupts = ; > + pinctrl-names = "default"; > + pinctrl-0 = <&uart0_bus>; > + clocks = <&cmu_peric0 CLK_GOUT_PERIC0_PCLK_0>, > + <&cmu_peric0 CLK_GOUT_PERIC0_IPCLK_0>; > + clock-names = "uart", "clk_uart_baud0"; > + samsung,uart-fifosize = <256>; > + status = "disabled"; > + }; > + > + /* USI: SPI */ > + spi_0: spi@10300000 { > + compatible = "samsung,exynosautov9-spi"; > + reg = <0x10300000 0x30>; > + interrupts = ; > + pinctrl-names = "default"; > + pinctrl-0 = <&spi0_bus &spi0_cs_func>; > + clocks = <&cmu_peric0 CLK_GOUT_PERIC0_IPCLK_0>, > + <&cmu_peric0 CLK_DOUT_PERIC0_USI00_USI>, > + <&cmu_peric0 CLK_GOUT_PERIC0_PCLK_0>; > + clock-names = "spi", "spi_busclk0", "spi_ioclk"; > + samsung,spi-src-clk = <0>; > + dmas = <&pdma0 1 &pdma0 0>; These are two separate phandles <>, not one. > + dma-names = "tx", "rx"; > + num-cs = <1>; > + #address-cells = <1>; > + #size-cells = <0>; > + status = "disabled"; > + }; > + > + /* USI: I2C */ > + hsi2c_0: hsi2c@10300000 { > + compatible = "samsung,exynosautov9-hsi2c"; > + reg = <0x10300000 0xc0>; > + interrupts = ; > + pinctrl-names = "default"; > + pinctrl-0 = <&hsi2c0_bus>; > + clocks = <&cmu_peric0 CLK_GOUT_PERIC0_IPCLK_0>, > + <&cmu_peric0 CLK_GOUT_PERIC0_PCLK_0>; > + clock-names = "hsi2c", "hsi2c_pclk"; > + #address-cells = <1>; > + #size-cells = <0>; > + status = "disabled"; > + }; > + }; Best regards, Krzysztof _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel