From patchwork Tue Jul 16 21:48:31 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hongwei Zhang X-Patchwork-Id: 1132959 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 45pDYh58QGz9s8m for ; Wed, 17 Jul 2019 07:48:56 +1000 (AEST) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=ami.com Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 45pDYh2VdtzDqXw for ; Wed, 17 Jul 2019 07:48:56 +1000 (AEST) X-Original-To: linux-aspeed@lists.ozlabs.org Delivered-To: linux-aspeed@lists.ozlabs.org Authentication-Results: lists.ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=ami.com (client-ip=63.147.10.42; helo=atlmailgw2.ami.com; envelope-from=hongweiz@ami.com; receiver=) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=ami.com Received: from atlmailgw2.ami.com (atlmailgw2.ami.com [63.147.10.42]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 45pDYX6cVbzDqQB for ; Wed, 17 Jul 2019 07:48:47 +1000 (AEST) X-AuditID: ac10606f-d11ff70000003324-70-5d2e463cf93b 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 atlmailgw2.ami.com (Symantec Messaging Gateway) with SMTP id 38.D3.13092.C364E2D5; Tue, 16 Jul 2019 17:48:44 -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; Tue, 16 Jul 2019 17:48:43 -0400 From: Hongwei Zhang To: Joel Stanley , Andrew Jeffery , Linus Walleij , Subject: [PATCH 2/3 v3] dt-bindings: gpio: aspeed: Add SGPIO support Date: Tue, 16 Jul 2019 17:48:31 -0400 Message-ID: <1563313711-17961-1-git-send-email-hongweiz@ami.com> X-Mailer: git-send-email 2.7.4 MIME-Version: 1.0 X-Originating-IP: [172.16.98.93] X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFjrPLMWRmVeSWpSXmKPExsWyRiBhgq6Nm16swedDqha7LnNYfJl7isVi /pFzrBa/z/9ltpjyZzmTxabH11gtmlefY7bYPP8Po8XlXXPYLJZev8hk0br3CLsDt8fV9l3s HmvmrWH0eH+jld3j4sdjzB6bVnWyedy5tofNY/OSeo/zMxYyenzeJBfAGcVlk5Kak1mWWqRv l8CVcWbCO6aCVWYVPRfaWRoYj2p3MXJySAiYSNy48pali5GLQ0hgF5PE75nNTBDOYUaJnh1b GUGq2ATUJPZungOWEBHoZZRY+HUxmMMssJpJon3DcXaQKmEBF4kvbafYQGwWAVWJ/7OPMYPY vAIOErMbX7BD7JOTuHmuEyouKHFy5hMWEJtZQELi4IsXYHEhAVmJW4ceM0HUK0g873vMMoGR bxaSlllIWhYwMq1iFEosyclNzMxJLzfSS8zN1EvOz93ECAn0/B2MHz+aH2Jk4mA8xCjBwawk wmv7VTtWiDclsbIqtSg/vqg0J7X4EKM0B4uSOO+qNd9ihATSE0tSs1NTC1KLYLJMHJxSDYxR Hr4sTptep+9/slP0i0fML4fZx3/FO2t6t8sZG9R8mvEtmfmXi4bFmolRT8sM1A0kfgd2Shu6 7jCuThO3udZmculNxF3OPa8jlSvX+b09eviN367wFbzbPyQvXFtxa/639zU7P/0/XpbnySE9 JXyGv5Ty4tyM97N9424c1ml7UFu5ZNpDnVAlluKMREMt5qLiRADOyDkEYgIAAA== 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: Mark Rutland , 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 Errors-To: linux-aspeed-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Linux-aspeed" Add bindings to support SGPIO on AST2400 or AST2500. Signed-off-by: Hongwei Zhang --- .../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..8c3a747 --- /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 + +- nr-gpios : number of GPIO pins to serialise. + (should be multiple of 8, up to 80 pins; 0 if not used) + +- clocks : A phandle to the APB clock for SGPM clock division + +- bus-frequency : SGPM CLK frequency, derived from APB bus clock by a programmable devisor + + +The sgpio and interrupt properties are further described in their respective bindings documentation: + +- Documentation/devicetree/bindings/sgpio/gpio.txt +- Documentation/devicetree/bindings/interrupt-controller/interrupts.txt + + Example: + sgpio@1e780200 { + #gpio-cells = <2>; + compatible = "aspeed,ast2500-sgpio"; + gpio-controller; + interrupts = <40>; + reg = <0x1e780200 0x0100>; + clocks = <&syscon ASPEED_CLK_APB>; + interrupt-controller; + nr-gpios = <8>; + bus-frequency = <12000000>; + };