From patchwork Mon Jun 22 23:08:58 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Srinivas Kandagatla X-Patchwork-Id: 487416 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 7ACD914010F for ; Tue, 23 Jun 2015 09:10:52 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932200AbbFVXJM (ORCPT ); Mon, 22 Jun 2015 19:09:12 -0400 Received: from mail-wi0-f176.google.com ([209.85.212.176]:35908 "EHLO mail-wi0-f176.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754313AbbFVXJE (ORCPT ); Mon, 22 Jun 2015 19:09:04 -0400 Received: by wicnd19 with SMTP id nd19so90239594wic.1 for ; Mon, 22 Jun 2015 16:09:02 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=IFzkVNB1mhxx6cX6pEsNN5jXOvyz9nBrsCZxlZq1n3s=; b=NMY8H7ufu5Uml3CR7VBaLaXX9TOh3Th3YYk0WLS1Jer1qE+HUdy5OwJ9e0cmWR5kUQ 0pSJHdugh8JYcnyA311vjsIAR/j/WYl+Shats46V8/Zt+P85MqPwzko+IXvyYLJb3mOp D5KYuQrl79UdcWvg6A2KmyIb9oaMxq7SlgApVe288xxUzBuoKAKqtiWeT1KkUh/B53e5 OxvtGx/zyxNCY2Z1ogFj7waK4XgZ9OBSvMhGjOa4pWFm7q0iFKHclVG5O/D7MDKVyuJg 5z0knrOB7ydEIoWl6MOCqvdYc5Iv0ePchtvzi6Yy8KY7cPZjCoeOU7hHhkHQfo4Fvd9K Y4Rw== X-Gm-Message-State: ALoCoQmPvrtl4LS05BFHZRminHK960EFXyBRquxak+9VT/C2XpJAbdzieD8fgcXcOpQLtEEV0Kao X-Received: by 10.180.87.38 with SMTP id u6mr36335365wiz.43.1435014542872; Mon, 22 Jun 2015 16:09:02 -0700 (PDT) Received: from srini-ThinkPad-X1-Carbon-2nd.dlink.com (host-2-98-208-65.as13285.net. [2.98.208.65]) by mx.google.com with ESMTPSA id q4sm32727186wja.24.2015.06.22.16.09.00 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Mon, 22 Jun 2015 16:09:02 -0700 (PDT) From: Srinivas Kandagatla To: linux-arm-kernel@lists.infradead.org, Greg Kroah-Hartman Cc: Maxime Ripard , Rob Herring , Kumar Gala , Mark Brown , s.hauer@pengutronix.de, linux-api@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-msm@vger.kernel.org, arnd@arndb.de, sboyd@codeaurora.org, pantelis.antoniou@konsulko.com, mporter@konsulko.com, stefan.wahren@i2se.com, wxt@rock-chips.com, Srinivas Kandagatla Subject: [PATCH v6 4/9] nvmem: Add bindings for simple nvmem framework Date: Tue, 23 Jun 2015 00:08:58 +0100 Message-Id: <1435014538-26308-1-git-send-email-srinivas.kandagatla@linaro.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1435014459-26138-1-git-send-email-srinivas.kandagatla@linaro.org> References: <1435014459-26138-1-git-send-email-srinivas.kandagatla@linaro.org> Sender: devicetree-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org This patch adds bindings for simple nvmem framework which allows nvmem consumers to talk to nvmem providers to get access to nvmem cell data. Signed-off-by: Maxime Ripard [Maxime Ripard: intial version of eeprom framework] Signed-off-by: Srinivas Kandagatla --- Documentation/devicetree/bindings/nvmem/nvmem.txt | 85 +++++++++++++++++++++++ 1 file changed, 85 insertions(+) create mode 100644 Documentation/devicetree/bindings/nvmem/nvmem.txt diff --git a/Documentation/devicetree/bindings/nvmem/nvmem.txt b/Documentation/devicetree/bindings/nvmem/nvmem.txt new file mode 100644 index 0000000..d1a37e7 --- /dev/null +++ b/Documentation/devicetree/bindings/nvmem/nvmem.txt @@ -0,0 +1,85 @@ += NVMEM(Non Volatile Memory) Data Device Tree Bindings = + +This binding is intended to represent the location of hardware +configuration data stored in NVMEMs like eeprom, efuses and so on. + +On a significant proportion of boards, the manufacturer has stored +some data on NVMEM, for the OS to be able to retrieve these information +and act upon it. Obviously, the OS has to know about where to retrieve +these data from, and where they are stored on the storage device. + +This document is here to document this. + += Data providers = +Contains bindings specific to provider drivers and data cells as children +of this node. + +Optional properties: + read-only: Mark the provider as read only. + += Data cells = +These are the child nodes of the provider which contain data cell +information like offset and size in nvmem provider. + +Required properties: +reg: specifies the offset in byte within that storage device, start bit + in the byte and the length in bits of the data we care about. + There could be more than one offset-length pairs in this property. + +Optional properties: + +bit-offset: specifies the offset in bit within the address range specified + by reg property. Can take values from 0-7. +nbits: specifies number of bits this cell occupies starting from bit-offset. + +For example: + + /* Provider */ + qfprom: qfprom@00700000 { + ... + + /* Data cells */ + tsens_calibration: calib@404 { + reg = <0x404 0x10>; + }; + + tsens_calibration_bckp: calib_bckp@504 { + reg = <0x504 0x11>; + bit-offset = 6; + nbits = 128; + }; + + pvs_version: pvs-version@6 { + reg = <0x6 0x2> + bit-offset = 7; + nbits = 2; + }; + + speed_bin: speed-bin@c{ + reg = <0xc 0x1>; + bit-offset = 2; + nbits = 3; + + }; + ... + }; + += Data consumers = +Are device nodes which consume nvmem data cells/providers. + +Required-properties: +nvmem-cell: list of phandle to the nvmem data cells. +nvmem-cell-names: names for the each nvmem-cell specified. Required if + nvmem-cell is used. + +Optional-properties: +nvmem : list of phandles to nvmem providers. +nvmem-names: names for the each nvmem provider. required if nvmem is used. + +For example: + + tsens { + ... + nvmem-cell = <&tsens_calibration>; + nvmem-cell-names = "calibration"; + };