From patchwork Fri Jun 9 22:39:35 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Joshua Clayton X-Patchwork-Id: 9779507 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 7248C60352 for ; Fri, 9 Jun 2017 22:40:50 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 63E39286C1 for ; Fri, 9 Jun 2017 22:40:50 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 57B2F286CD; Fri, 9 Jun 2017 22:40:50 +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=-6.8 required=2.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED, DKIM_SIGNED, FREEMAIL_FROM, RCVD_IN_DNSWL_HI, T_DKIM_INVALID autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id D336F286C1 for ; Fri, 9 Jun 2017 22:40:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751806AbdFIWj4 (ORCPT ); Fri, 9 Jun 2017 18:39:56 -0400 Received: from mail-pg0-f65.google.com ([74.125.83.65]:35671 "EHLO mail-pg0-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751633AbdFIWjw (ORCPT ); Fri, 9 Jun 2017 18:39:52 -0400 Received: by mail-pg0-f65.google.com with SMTP id f127so8802828pgc.2; Fri, 09 Jun 2017 15:39:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :in-reply-to:references; bh=OP2rSAg5Qr1rhlZll0Exytk2+XGEQYEXRCQ2Bb5FMHY=; b=SickKWcH5yWZomcHcK1dV9XW1aWA6UG6zK2w1TcIJ+GVc3SdOVZvLW8hEWsbpIujh6 OBW61N/qJebIXvog691i68Np21U+80+P7X3ZbvS1s4TDE7ODrkhvH1DFdUkhqlhQ8mxN uMgULCadMQ01t1rv93ocTx38ksq5UcA3mQl6UWBdKBTq5QbSRK4OoydrYv97UuDqD+Jl 08kTAgaiUrUKlqR051ozHTI7KkokCWMp+nSv8R9eSZhqz64OZjeJ3ujd/ovcZYCYdy+z lNsVgndO2lkPL6p2WHEj+z/fqDd2LJA++kSzxF6H1hzTfS2GShlIV9P96DB13twwalFj cUIA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:in-reply-to:references; bh=OP2rSAg5Qr1rhlZll0Exytk2+XGEQYEXRCQ2Bb5FMHY=; b=qkOGersHeUeXakx1t9bBXY/2/TdWXjWP+ShRaGQhAraIGiZlv7UwZY7T2M4bB2Vvi0 kPO+8Q7UOfY7VXnQGThvNZWPbTvRGHJ53lDaMJYSxYxvGYfv6EhkFK2UKojOJsiyOzKq bHpD56VAhrJW2Pnv74x7eILQHxsOCCaYq/LV8jG+0bfCm+V0E2LVPfjWOAwCMW7W9yk1 pXIF8kKRZbKMSDIWr7dNf8W4SzAsC0Umlik09x5D1QBbCxpp4l5BqLh/RGjNG5hfTdtt sibXb5z+uvicnuOm3HmCS3CrVewjuvQOus1teEoG9DKvoRM0riBSdduKwxnWc1o+sI0i nohQ== X-Gm-Message-State: AODbwcBuC25VRw/FhVJoiOc9i/KnVC0RuM0LMJDty7KP+kTover+AyD8 affvUdNob4f/Kg== X-Received: by 10.99.141.200 with SMTP id z191mr33313755pgd.99.1497047992020; Fri, 09 Jun 2017 15:39:52 -0700 (PDT) Received: from localhost.localdomain (68-185-59-186.static.knwc.wa.charter.com. [68.185.59.186]) by smtp.gmail.com with ESMTPSA id s4sm4771804pgr.10.2017.06.09.15.39.49 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 09 Jun 2017 15:39:51 -0700 (PDT) From: Joshua Clayton To: Alan Tull , Moritz Fischer , Anatolij Gustschin , Bastian Stender , Shawn Guo , Joshua Clayton Cc: Rob Herring , Mark Rutland , Sascha Hauer , Fabio Estevam , Russell King , linux-fpga@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH v13 2/6] doc: dt: document altera-passive-serial binding Date: Fri, 9 Jun 2017 15:39:35 -0700 Message-Id: <239fb9ad4848c96ddc944f99db811721653da95b.1497047816.git.stillcompiling@gmail.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <03e591707dc72f4c2b5e63a1272060956294ea51.1497047816.git.stillcompiling@gmail.com> References: <03e591707dc72f4c2b5e63a1272060956294ea51.1497047816.git.stillcompiling@gmail.com> In-Reply-To: <03e591707dc72f4c2b5e63a1272060956294ea51.1497047816.git.stillcompiling@gmail.com> References: <03e591707dc72f4c2b5e63a1272060956294ea51.1497047816.git.stillcompiling@gmail.com> Sender: linux-fpga-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fpga@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Describe an altera-passive-serial devicetree entry, required features Signed-off-by: Joshua Clayton Acked-by: Rob Herring --- .../bindings/fpga/altera-passive-serial.txt | 29 ++++++++++++++++++++++ 1 file changed, 29 insertions(+) create mode 100644 Documentation/devicetree/bindings/fpga/altera-passive-serial.txt diff --git a/Documentation/devicetree/bindings/fpga/altera-passive-serial.txt b/Documentation/devicetree/bindings/fpga/altera-passive-serial.txt new file mode 100644 index 000000000000..48478bc07e29 --- /dev/null +++ b/Documentation/devicetree/bindings/fpga/altera-passive-serial.txt @@ -0,0 +1,29 @@ +Altera Passive Serial SPI FPGA Manager + +Altera FPGAs support a method of loading the bitstream over what is +referred to as "passive serial". +The passive serial link is not technically SPI, and might require extra +circuits in order to play nicely with other SPI slaves on the same bus. + +See https://www.altera.com/literature/hb/cyc/cyc_c51013.pdf + +Required properties: +- compatible: Must be one of the following: + "altr,fpga-passive-serial", + "altr,fpga-arria10-passive-serial" +- reg: SPI chip select of the FPGA +- nconfig-gpios: config pin (referred to as nCONFIG in the manual) +- nstat-gpios: status pin (referred to as nSTATUS in the manual) + +Optional properties: +- confd-gpios: confd pin (referred to as CONF_DONE in the manual) + +Example: + fpga: fpga@0 { + compatible = "altr,fpga-passive-serial"; + spi-max-frequency = <20000000>; + reg = <0>; + nconfig-gpios = <&gpio4 9 GPIO_ACTIVE_LOW>; + nstat-gpios = <&gpio4 11 GPIO_ACTIVE_LOW>; + confd-gpios = <&gpio4 12 GPIO_ACTIVE_LOW>; + };