From patchwork Fri Dec 18 15:43:16 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicolas Saenz Julienne X-Patchwork-Id: 1418470 Return-Path: X-Original-To: incoming-dt@patchwork.ozlabs.org Delivered-To: patchwork-incoming-dt@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=devicetree-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=suse.de Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4CyCqR29g7z9sVJ for ; Sat, 19 Dec 2020 02:45:07 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726269AbgLRPod (ORCPT ); Fri, 18 Dec 2020 10:44:33 -0500 Received: from mx2.suse.de ([195.135.220.15]:43026 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726616AbgLRPoS (ORCPT ); Fri, 18 Dec 2020 10:44:18 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 42DE4AD60; Fri, 18 Dec 2020 15:43:36 +0000 (UTC) From: Nicolas Saenz Julienne To: srinivas.kandagatla@linaro.org, linux-kernel@vger.kernel.org, Saenz Julienne Cc: linux-arm-kernel@lists.infradead.org, linux@armlinux.org.uk, catalin.marinas@arm.com, will@kernel.org, devicetree@vger.kernel.org, linux-rpi-kernel@lists.infradead.org, robh+dt@kernel.org, bcm-kernel-feedback-list@broadcom.com, tim.gover@raspberrypi.com, phil@raspberrypi.com Subject: [PATCH v2 1/5] dt-bindings: nvmem: Add bindings for rmem driver Date: Fri, 18 Dec 2020 16:43:16 +0100 Message-Id: <20201218154320.28368-2-nsaenzjulienne@suse.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201218154320.28368-1-nsaenzjulienne@suse.de> References: <20201218154320.28368-1-nsaenzjulienne@suse.de> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org Firmware/co-processors might use reserved memory areas in order to pass data stemming from an nvmem device otherwise non accessible to Linux. For example an EEPROM memory only physically accessible to firmware, or data only accessible early at boot time. Introduce the dt-bindings to nvmem's rmem. Signed-off-by: Nicolas Saenz Julienne --- Changes since v1: - Update schema to new driver design .../devicetree/bindings/nvmem/rmem.yaml | 49 +++++++++++++++++++ 1 file changed, 49 insertions(+) create mode 100644 Documentation/devicetree/bindings/nvmem/rmem.yaml diff --git a/Documentation/devicetree/bindings/nvmem/rmem.yaml b/Documentation/devicetree/bindings/nvmem/rmem.yaml new file mode 100644 index 000000000000..29b53871aa02 --- /dev/null +++ b/Documentation/devicetree/bindings/nvmem/rmem.yaml @@ -0,0 +1,49 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/nvmem/rmem.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Reserved Memory Based nvmem Device + +maintainers: + - Nicolas Saenz Julienne + +allOf: + - $ref: "nvmem.yaml#" + +properties: + compatible: + items: + - enum: + - raspberrypi,bootloader-config + - const: nvmem-rmem + + no-map: + $ref: /schemas/types.yaml#/definitions/flag + description: + Avoid creating a virtual mapping of the region as part of the OS' + standard mapping of system memory. + +required: + - compatible + - no-map + +unevaluatedProperties: false + +examples: + - | + reserved-memory { + #address-cells = <1>; + #size-cells = <1>; + + blconfig: nvram@10000000 { + compatible = "raspberrypi,bootloader-config", "nvmem-rmem"; + #address-cells = <1>; + #size-cells = <1>; + reg = <0x10000000 0x1000>; + no-map; + }; + }; + +...