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Wed, 31 Jul 2019 20:02:17 +0000 Received: from atlmailgw1.ami.com ([63.147.10.40]) by bombadil.infradead.org with esmtps (Exim 4.92 #3 (Red Hat Linux)) id 1hsunP-0002RA-SR for linux-arm-kernel@lists.infradead.org; Wed, 31 Jul 2019 20:02:01 +0000 X-AuditID: ac1060b2-3fdff70000003a7d-99-5d41f3b6d51d Received: from atlms1.us.megatrends.com (atlms1.us.megatrends.com [172.16.96.144]) (using TLS with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (Client did not present a certificate) by atlmailgw1.ami.com (Symantec Messaging Gateway) with SMTP id EA.F1.14973.6B3F14D5; Wed, 31 Jul 2019 16:01:59 -0400 (EDT) Received: from hongweiz-Ubuntu-AMI.us.megatrends.com (172.16.98.93) by atlms1.us.megatrends.com (172.16.96.144) with Microsoft SMTP Server (TLS) id 14.3.408.0; Wed, 31 Jul 2019 16:01:57 -0400 From: Hongwei Zhang To: Andrew Jeffery , Linus Walleij , Joel Stanley , Subject: [v7 1/2] dt-bindings: gpio: aspeed: Add SGPIO support Date: Wed, 31 Jul 2019 16:01:36 -0400 Message-ID: <1564603297-1391-2-git-send-email-hongweiz@ami.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1564603297-1391-1-git-send-email-hongweiz@ami.com> References: <1564603297-1391-1-git-send-email-hongweiz@ami.com> MIME-Version: 1.0 X-Originating-IP: [172.16.98.93] X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrNLMWRmVeSWpSXmKPExsWyRiBhgu72z46xBs9n8ljsusxh8WXuKRaL +UfOsVr8Pv+X2WLKn+VMFpseX2O1aF59jtli8/w/jBaXd81hs2jde4Tdgcvjavsudo/3N1rZ PS5+PMbssWlVJ5vHnWt72Dw2L6n3OD9jIaPH501yARxRXDYpqTmZZalF+nYJXBlLtnxgLTgp UrHqQzNzA+MTgS5GTg4JAROJ/Tv2sHYxcnEICexiktjV/ogRwjnMKPG79Rs7SBWbgJrE3s1z mEASIgL9jBJ3ehvAEswCLUwSn5cVgdjCAnYSF7/+ZAWxWQRUJR5MX8wCYvMK2Escvb2KHWKd nMTNc53MIDangIPEr1/rgIZyAG2zl5j6vRqiXFDi5MwnLBDjJSQOvngBVi4kICtx69BjJogx ChLP+x6zTGAUmIWkZRaSlgWMTKsYhRJLcnITM3PSyw31EnMz9ZLzczcxQiJg0w7GlovmhxiZ OBgPMUpwMCuJ8C4Wt48V4k1JrKxKLcqPLyrNSS0+xCjNwaIkzrtyzbcYIYH0xJLU7NTUgtQi mCwTB6dUAyPv5zvTpTS7ljf7XbBx2m/PL1Xt/oBjG8M2LYbXX85WK7FGeFutPxlpuuBaY/rH olvuev03TkhM9N1jeMXvn8/BgKs6JhHH76mczfjtr3ToqP/a7LBV18q4Xq3ZsvLO4ZNhVwr6 fHPsni77oNbrf2br9+QpuZdOZFYn8Hw3ZWhRXnXO0uuvywElluKMREMt5qLiRAA4kPZzbgIA AA== X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190731_130200_002469_66863AF6 X-CRM114-Status: GOOD ( 13.71 ) 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: linux-aspeed@lists.ozlabs.org, linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, Bartosz Golaszewski , Rob Herring , Hongwei Zhang , linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP Add bindings to support SGPIO on AST2400 or AST2500. Signed-off-by: Hongwei Zhang Reviewed-by: Andrew Jeffery --- .../devicetree/bindings/gpio/sgpio-aspeed.txt | 55 ++++++++++++++++++++++ 1 file changed, 55 insertions(+) create mode 100644 Documentation/devicetree/bindings/gpio/sgpio-aspeed.txt diff --git a/Documentation/devicetree/bindings/gpio/sgpio-aspeed.txt b/Documentation/devicetree/bindings/gpio/sgpio-aspeed.txt new file mode 100644 index 0000000..8545bbc --- /dev/null +++ b/Documentation/devicetree/bindings/gpio/sgpio-aspeed.txt @@ -0,0 +1,55 @@ +Aspeed SGPIO controller Device Tree Bindings +------------------------------------------- + +This SGPIO controller is for ASPEED AST2500 SoC, it supports up to 80 full +featured Serial GPIOs. Each of the Serial GPIO pins can be programmed to +support the following options: +- Support interrupt option for each input port and various interrupt + sensitivity option (level-high, level-low, edge-high, edge-low) +- Support reset tolerance option for each output port +- Directly connected to APB bus and its shift clock is from APB bus clock + divided by a programmable value. +- Co-work with external signal-chained TTL components (74LV165/74LV595) + + +Required properties: + +- compatible : Either "aspeed,ast2400-sgpio" or "aspeed,ast2500-sgpio" + +- #gpio-cells : Should be two + - First cell is the GPIO line number + - Second cell is used to specify optional + parameters (unused) + +- reg : Address and length of the register set for the device +- gpio-controller : Marks the device node as a GPIO controller +- interrupts : Interrupt specifier (see interrupt bindings for + details) + +- interrupt-controller : Mark the GPIO controller as an interrupt-controller + +- ngpios : number of GPIO pins to serialise. + (should be multiple of 8, up to 80 pins) + +- clocks : A phandle to the APB clock for SGPM clock division + +- bus-frequency : SGPM CLK frequency + + +The sgpio and interrupt properties are further described in their respective bindings documentation: + +- Documentation/devicetree/bindings/gpio/gpio.txt +- Documentation/devicetree/bindings/interrupt-controller/interrupts.txt + + Example: + sgpio: sgpio@1e780200 { + #gpio-cells = <2>; + compatible = "aspeed,ast2500-sgpio"; + gpio-controller; + interrupts = <40>; + reg = <0x1e780200 0x0100>; + clocks = <&syscon ASPEED_CLK_APB>; + interrupt-controller; + ngpios = <8>; + bus-frequency = <12000000>; + };