From patchwork Wed Jul 17 20:12:05 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hongwei Zhang X-Patchwork-Id: 11048221 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 E1ED91510 for ; Wed, 17 Jul 2019 20:12:18 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id D0C8A286C4 for ; Wed, 17 Jul 2019 20:12:18 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id C459B28720; Wed, 17 Jul 2019 20:12:18 +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 47680286C4 for ; Wed, 17 Jul 2019 20:12:18 +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=5srlZvqQ0McmQUFMVEAeE2BMB/89vVn3KLmEbQn1uRk=; b=ohENXuBKkwBFFx DvASsIM9VDt7Oq62LLHLeJyyUBDnitGEIAZCCXJLIOuv6yk9O9mFvclW+FPluLISJL8oM43v+lDLt 9Xr/aANVup6yO+OT8mHgpz3mXsDvQ0VKnP+wrkbnf3cbh79uRJc/FLw33F2FymyWz1o0nEReFlfOd ttkXvP34OfcjKmFAyKkEJBUbK0v6TZGUoph33lDoJCPs++KRE8cOggs+K35yBchhcuVSoRiR9anf8 J1Jp8UFcT2ASVQMKuDTqc3tjMc1e6SnObNvW0vPwGrUCrJ2bsR3OwiaZe+P0lA/Md9eqIo5Fxfe4N J6i/OLDpIJffMoyZIU1A==; 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 1hnqHg-0004FK-Cc; Wed, 17 Jul 2019 20:12:16 +0000 Received: from atlmailgw2.ami.com ([63.147.10.42]) by bombadil.infradead.org with esmtps (Exim 4.92 #3 (Red Hat Linux)) id 1hnqHc-0004EA-N1 for linux-arm-kernel@lists.infradead.org; Wed, 17 Jul 2019 20:12:14 +0000 X-AuditID: ac10606f-d11ff70000003324-a1-5d2f811a4366 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 D3.B5.13092.A118F2D5; Wed, 17 Jul 2019 16:12:10 -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, 17 Jul 2019 16:12:09 -0400 From: Hongwei Zhang To: Joel Stanley , Andrew Jeffery , Linus Walleij , Subject: [PATCH 2/3 v4] dt-bindings: gpio: aspeed: Add SGPIO support Date: Wed, 17 Jul 2019 16:12:05 -0400 Message-ID: <1563394325-15941-1-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+NgFjrHLMWRmVeSWpSXmKPExsWyRiBhgq5Uo36swcx1aha7LnNYfJl7isVi /pFzrBa/z/9ltpjyZzmTxabH11gtmlefY7bYPP8Po8XlXXPYLJZev8hk0br3CLsDt8fV9l3s HmvmrWH0eH+jld3j4sdjzB6bVnWyedy5tofNY/OSeo/zMxYyenzeJBfAGcVlk5Kak1mWWqRv l8CVsX7LcpaCuSIVX2YaNDDuF+hi5OSQEDCRuHHnOFMXIxeHkMAuJonNa/awQDiHGSUWX9jA DFLFJqAmsXfzHLAqEYFeRomFXxeDOcwCq5kk2jccZwepEhZwkVhxux3MZhFQleh/tZ8RxOYV cJC4sAKkG2SfnMTNc53MEHFBiZMzn7CA2MwCEhIHX7wAiwsJyErcOvQYql5B4nnfY5YJjHyz kLTMQtKygJFpFaNQYklObmJmTnq5kV5ibqZecn7uJkZImOfvYPz40fwQIxMH4yFGCQ5mJRFe 26/asUK8KYmVValF+fFFpTmpxYcYpTlYlMR5V635FiMkkJ5YkpqdmlqQWgSTZeLglGpgNHx4 p+L9a5nanOj3n0K4mmcyfF00T5F5wvG9EhOW2/M921nz07xVsnBSBmP4mUOhio8Dnp1dyrD3 lc9Spv5Mrhmu3JGiXqJ2G568dXktv/f8lCSGaT2XHnPKfuP6tZ5flunhJOG0ecnP2r7JJc1K nHn+dDj/17O5K+axaSXpd7dsXyJ4hGkvvxJLcUaioRZzUXEiANmQldVhAgAA X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190717_131212_818972_5B0814E0 X-CRM114-Status: GOOD ( 13.28 ) 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..2d6305e --- /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) + +- 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/sgpio/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; + nr-gpios = <8>; + bus-frequency = <12000000>; + };