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: 11046747 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id B1B5714DB for ; Tue, 16 Jul 2019 21:48:51 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 963252869D for ; Tue, 16 Jul 2019 21:48:51 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 89C59286A2; Tue, 16 Jul 2019 21:48:51 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id E98692869D for ; Tue, 16 Jul 2019 21:48:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-ID:Date:Subject:To :From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=1fLRmr2r75pyw3yEj5tIKQDziG8x7wBynaA/41dIzHw=; b=uS5CvM/t3r2Hd4 ScdvBzUzOVfQMi5bEHq+540xLxoIRocivNnMeji+tDZQReoI7p49H76TZXJQWKabNkyIcepzx9kj2 EeocyUzOQZXbrLXSXqY9IKkNEodbF08ve7UOtgsRv+QTuyZUuDOlsr0AnhPIWK43GUG79/YriiNig BxxxXZF1Hec0b2R4ZwrcGOWvVNBp/xfc+SmHJilmwcaQb1UrTcWUBsXYa/kvPd6wTJenWgHn6EiDf E5Df49D4+zjnsWbG3m0yQdZoPMh5jHswp2SiuY8RuCk2R4XsfXzcUAIHYE6bGFFQAM2kMzsCjWvu5 z0WQzO8W3o7Jg/YWxfMA==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1hnVJa-0002dD-E8; Tue, 16 Jul 2019 21:48:50 +0000 Received: from atlmailgw2.ami.com ([63.147.10.42]) by bombadil.infradead.org with esmtps (Exim 4.92 #3 (Red Hat Linux)) id 1hnVJV-0002c9-UE for linux-arm-kernel@lists.infradead.org; Tue, 16 Jul 2019 21:48:47 +0000 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-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190716_144846_052351_48375F6B X-CRM114-Status: GOOD ( 31.85 ) 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: 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 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 --- .../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>; + };