From patchwork Fri Jan 9 13:20:31 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicolas Ferre X-Patchwork-Id: 5600201 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id D58609F1C5 for ; Fri, 9 Jan 2015 13:23:57 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id D378B204DF for ; Fri, 9 Jan 2015 13:23:56 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id CBC9A2011B for ; Fri, 9 Jan 2015 13:23:55 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1Y9ZV1-0007I5-D6; Fri, 09 Jan 2015 13:21:11 +0000 Received: from eusmtp01.atmel.com ([212.144.249.243]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1Y9ZUZ-0006vk-K3 for linux-arm-kernel@lists.infradead.org; Fri, 09 Jan 2015 13:20:44 +0000 Received: from tenerife.corp.atmel.com (10.161.101.13) by eusmtp01.atmel.com (10.161.101.31) with Microsoft SMTP Server id 14.2.347.0; Fri, 9 Jan 2015 14:19:59 +0100 From: Nicolas Ferre To: , , Arnd Bergmann , Olof Johansson , Subject: [PATCH] ARM: at91/Documentation: add a README for Atmel SoCs Date: Fri, 9 Jan 2015 14:20:31 +0100 Message-ID: <1420809631-26923-1-git-send-email-nicolas.ferre@atmel.com> X-Mailer: git-send-email 2.1.3 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20150109_052044_115118_74CFC4FE X-CRM114-Status: GOOD ( 10.69 ) X-Spam-Score: -0.0 (/) Cc: Boris BREZILLON , ARM Maintainers , Nicolas Ferre , Patrice Vilchez , Ludovic Desroches , Alexandre Belloni , Cyrille Pitchen , Jean-Christophe PLAGNIOL-VILLARD X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Add a README file to describe Atmel SoCs (aka AT91) support in Mainline Linux: - SoC list + datasheet web links - Basic but useful information - Device Tree conventions and Work In Progress statement. Signed-off-by: Nicolas Ferre Cc: ARM Maintainers Acked-by: Olof Johansson --- Documentation/arm/Atmel/README | 120 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 120 insertions(+) create mode 100644 Documentation/arm/Atmel/README diff --git a/Documentation/arm/Atmel/README b/Documentation/arm/Atmel/README new file mode 100644 index 000000000000..538f8a556277 --- /dev/null +++ b/Documentation/arm/Atmel/README @@ -0,0 +1,120 @@ +ARM Atmel SoCs (aka AT91) +========================= + + +Introduction +------------ +This document gives useful information about the ARM Atmel SoCs that are +currently supported in Linux Mainline (you know, the one on kernel.org). + +It is important to note that the Atmel | SMART ARM-based MPU product line is +historically named "AT91" or "at91" throughout the Linux kernel development +process even if this product prefix has completely disappeared from the +official Atmel product name. Anyway, files, directories, git trees, +git branches/tags and email subject always contain this "at91" sub-string. + + +AT91 SoCs +--------- +Documentation and detailled datasheet for each product are available on +the Atmel website: http://www.atmel.com. + + Flavors: + * ARM 920 based SoC + - at91rm9200 + + Datasheet + http://www.atmel.com/Images/doc1768.pdf + + * ARM 926 based SoCs + - at91sam9260 + + Datasheet + http://www.atmel.com/Images/doc6221.pdf + + - at91sam9261 + + Datasheet + http://www.atmel.com/Images/doc6062.pdf + + - at91sam9263 + + Datasheet + http://www.atmel.com/Images/Atmel_6249_32-bit-ARM926EJ-S-Microcontroller_SAM9263_Datasheet.pdf + + - at91sam9rl + + Datasheet + http://www.atmel.com/Images/doc6289.pdf + + - at91sam9g20 + + Datasheet + http://www.atmel.com/Images/doc6384.pdf + + - at91sam9g45 family + - at91sam9g45 + - at91sam9g46 + - at91sam9m10 + - at91sam9m11 (device superset) + + Datasheet + http://www.atmel.com/Images/Atmel-6437-32-bit-ARM926-Embedded-Microprocessor-SAM9M11_Datasheet.pdf + + - at91sam9x5 family (aka "The 5 series") + - at91sam9g15 + - at91sam9g25 + - at91sam9g35 + - at91sam9x25 + - at91sam9x35 + + Datasheet (can be considered as covering the whole family) + http://www.atmel.com/Images/Atmel_11055_32-bit-ARM926EJ-S-Microcontroller_SAM9X35_Datasheet.pdf + + - at91sam9n12 + + Datasheet + http://www.atmel.com/Images/Atmel_11063_32-bit-ARM926EJ-S-Microcontroller_SAM9N12CN11CN12_Datasheet.pdf + + * ARM Cortex-A5 based SoCs + - sama5d3 family + - sama5d31 + - sama5d33 + - sama5d34 + - sama5d35 + - sama5d36 (device superset) + + Datasheet + http://www.atmel.com/Images/Atmel-11121-32-bit-Cortex-A5-Microcontroller-SAMA5D3_Datasheet.pdf + + * ARM Cortex-A5 + NEON based SoCs + - sama5d4 family + - sama5d41 + - sama5d42 + - sama5d43 + - sama5d44 (device superset) + + Datasheet + http://www.atmel.com/Images/Atmel-11238-32-bit-Cortex-A5-Microcontroller-SAMA5D4_Datasheet.pdf + + +Linux kernel information +------------------------ +Linux kernel mach directory: arch/arm/mach-at91 +MAINTAINERS entry is: "ARM/ATMEL AT91RM9200 AND AT91SAM ARM ARCHITECTURES" + + +Device Tree for AT91 SoCs and boards +------------------------------------ +All AT91 SoCs are converted to Device Tree. Since Linux 3.19, these products +must use this method to boot the Linux kernel. + +Work In Progress statement: +Device Tree files and Device Tree bindings that apply to AT91 SoCs and boards are +considered as "Unstable". To be completely clear, any at91 binding can change at +any time. So, be sure to use a Device Tree Binary and a Kernel Image generated from +the same source tree. +Please refer to the Documentation/devicetree/bindings/ABI.txt file for a +definition of a "Stable" binding/ABI. +This statement will be removed by AT91 MAINTAINERS when appropriated. + +Naming conventions and best practice: +- SoCs Device Tree Source Include files are named after the official name of + the product (at91sam9g20.dtsi or sama5d33.dtsi for instance). +- Device Tree Source Include files (.dtsi) are used to collect common nodes that can be + shared across SoCs or boards (sama5d3.dtsi or at91sam9x5cm.dtsi for instance). + When collecting nodes for a particular peripheral or topic, the identifier have to + be placed at the end of the file name, separated with a "_" (at91sam9x5_can.dtsi + or sama5d3_gmac.dtsi for example). +- board Device Tree Source files (.dts) are prefixed by the string "at91-" so + that they can be identified easily. Note that the sama5d3[13456]ek.dts files + are an historical exception to this rule.