From patchwork Thu Apr 28 12:03:27 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Boris Brezillon X-Patchwork-Id: 616140 Return-Path: X-Original-To: incoming-dt@patchwork.ozlabs.org Delivered-To: patchwork-incoming-dt@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 3qwb8Y2LMDz9t73 for ; Thu, 28 Apr 2016 22:03:57 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753614AbcD1MDi (ORCPT ); Thu, 28 Apr 2016 08:03:38 -0400 Received: from down.free-electrons.com ([37.187.137.238]:59541 "EHLO mail.free-electrons.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753592AbcD1MDe (ORCPT ); Thu, 28 Apr 2016 08:03:34 -0400 Received: by mail.free-electrons.com (Postfix, from userid 110) id 84CD747E; Thu, 28 Apr 2016 14:03:32 +0200 (CEST) X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on mail.free-electrons.com X-Spam-Level: X-Spam-Status: No, score=-1.0 required=5.0 tests=ALL_TRUSTED,SHORTCIRCUIT, URIBL_BLOCKED shortcircuit=ham autolearn=disabled version=3.4.0 Received: from bbrezillon.home (LStLambert-657-1-97-87.w90-63.abo.wanadoo.fr [90.63.216.87]) by mail.free-electrons.com (Postfix) with ESMTPSA id 2739547D; Thu, 28 Apr 2016 14:03:32 +0200 (CEST) From: Boris Brezillon To: Nicolas Ferre , Jean-Christophe Plagniol-Villard , Alexandre Belloni , Rob Herring , Pawel Moll , Mark Rutland , Ian Campbell , Kumar Gala , devicetree@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Arnd Bergmann , Jean-Jacques Hiblot , Boris Brezillon Subject: [PATCH v7 2/2] memory: atmel-ebi: add DT bindings documentation Date: Thu, 28 Apr 2016 14:03:27 +0200 Message-Id: <1461845007-23139-2-git-send-email-boris.brezillon@free-electrons.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1461845007-23139-1-git-send-email-boris.brezillon@free-electrons.com> References: <1461845007-23139-1-git-send-email-boris.brezillon@free-electrons.com> Sender: devicetree-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org The EBI (External Bus Interface) is used to access external peripherals (NOR, SRAM, NAND, and other specific devices like ethernet controllers). Each device is assigned a CS line and an address range and can have its own configuration (timings, access mode, bus width, ...). This driver provides a generic DT binding to configure a device according to its requirements. For specific device controllers (like the NAND one) the SMC timings should be configured by the controller driver through the matrix and smc syscon regmaps. Signed-off-by: Boris Brezillon --- .../bindings/memory-controllers/atmel,ebi.txt | 136 +++++++++++++++++++++ 1 file changed, 136 insertions(+) create mode 100644 Documentation/devicetree/bindings/memory-controllers/atmel,ebi.txt diff --git a/Documentation/devicetree/bindings/memory-controllers/atmel,ebi.txt b/Documentation/devicetree/bindings/memory-controllers/atmel,ebi.txt new file mode 100644 index 0000000..a6dca5c --- /dev/null +++ b/Documentation/devicetree/bindings/memory-controllers/atmel,ebi.txt @@ -0,0 +1,136 @@ +* Device tree bindings for Atmel EBI + +The External Bus Interface (EBI) controller is a bus where you can connect +asynchronous (NAND, NOR, SRAM, ....) and synchronous memories (SDR/DDR SDRAMs). +The EBI provides a glue-less interface to asynchronous memories through the SMC +(Static Memory Controller). + +Required properties: + +- compatible: "atmel,at91sam9260-ebi" + "atmel,at91sam9261-ebi" + "atmel,at91sam9263-ebi0" + "atmel,at91sam9263-ebi1" + "atmel,at91sam9rl-ebi" + "atmel,at91sam9g45-ebi" + "atmel,at91sam9x5-ebi" + "atmel,sama5d3-ebi" + +- reg: Contains offset/length value for EBI memory mapping. + This property might contain several entries if the EBI + memory range is not contiguous + +- #address-cells: Must be 2. + The first cell encodes the CS. + The second cell encode the offset into the CS memory + range. + +- #size-cells: Must be set to 1. + +- ranges: Encodes CS to memory region association. + +- clocks: Clock feeding the EBI controller. + See clock-bindings.txt + +Children device nodes are representing device connected to the EBI bus. + +Required device node properties: + +- #reg: Contains the chip-select id, the offset and the length + of the memory region requested by the device. + +EBI bus configuration associated with specific chip-select will be defined in +the configs subnode. This configs node will in turn contain several subnodes +named config-, each of them containing the following properties. + +Optional config- node properties: + +- atmel,bus-width: width of the asynchronous device's data bus + 8, 16 or 32. + Default to 8 when undefined. + +- atmel,byte-access-type "write" or "select" (see Atmel datasheet). + Default to "select" when undefined. + +- atmel,read-mode "nrd" or "ncs". + Default to "ncs" when undefined. + +- atmel,write-mode "nwe" or "ncs". + Default to "ncs" when undefined. + +- atmel,exnw-mode "disabled", "frozen" or "ready". + Default to "disabled" when undefined. + +- atmel,page-mode enable page mode if present. The provided value + defines the page size (supported values: 4, 8, + 16 and 32). + +- atmel,tdf-mode: "normal" or "optimized". When set to + "optimized" the data float time is optimized + depending on the next device being accessed + (next device setup time is subtracted to the + current device data float time). + Default to "normal" when undefined. + +Mandatory timings expressed in nanoseconds (see Atmel datasheet for a full +description). + +- atmel,ncs-rd-setup-ns +- atmel,nrd-setup-ns +- atmel,ncs-wr-setup-ns +- atmel,nwe-setup-ns +- atmel,ncs-rd-pulse-ns +- atmel,nrd-pulse-ns +- atmel,ncs-wr-pulse-ns +- atmel,nwe-pulse-ns +- atmel,nwe-cycle-ns +- atmel,nrd-cycle-ns +- atmel,tdf-ns + +Example: + + ebi: ebi@10000000 { + compatible = "atmel,sama5d3-ebi"; + #address-cells = <2>; + #size-cells = <1>; + atmel,smc = <&hsmc>; + atmel,matrix = <&matrix>; + reg = <0x10000000 0x10000000 + 0x40000000 0x30000000>; + ranges = <0x0 0x0 0x10000000 0x10000000 + 0x1 0x0 0x40000000 0x10000000 + 0x2 0x0 0x50000000 0x10000000 + 0x3 0x0 0x60000000 0x10000000>; + clocks = <&mck>; + + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_ebi_addr>; + + configs { + config-0 { + atmel,read-mode = "nrd"; + atmel,write-mode = "nwe"; + atmel,bus-width = <16>; + atmel,ncs-rd-setup-ns = <0>; + atmel,ncs-wr-setup-ns = <0>; + atmel,nwe-setup-ns = <8>; + atmel,nrd-setup-ns = <16>; + atmel,ncs-rd-pulse-ns = <84>; + atmel,ncs-wr-pulse-ns = <84>; + atmel,nrd-pulse-ns = <76>; + atmel,nwe-pulse-ns = <76>; + atmel,nrd-cycle-ns = <107>; + atmel,nwe-cycle-ns = <84>; + atmel,tdf-ns = <16>; + }; + }; + + nor: flash@0,0 { + compatible = "cfi-flash"; + #address-cells = <1>; + #size-cells = <1>; + reg = <0x0 0x0 0x1000000>; + bank-width = <2>; + }; + }; +