From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B10E2C2BBCF for ; Fri, 18 Dec 2020 15:44:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 71B3323B77 for ; Fri, 18 Dec 2020 15:44:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729104AbgLRPoV (ORCPT ); Fri, 18 Dec 2020 10:44:21 -0500 Received: from mx2.suse.de ([195.135.220.15]:43184 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726264AbgLRPoU (ORCPT ); Fri, 18 Dec 2020 10:44:20 -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 4C86AADE1; Fri, 18 Dec 2020 15:43:38 +0000 (UTC) From: Nicolas Saenz Julienne To: srinivas.kandagatla@linaro.org, linux-kernel@vger.kernel.org, Rob Herring , Nicolas 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, bcm-kernel-feedback-list@broadcom.com, tim.gover@raspberrypi.com, phil@raspberrypi.com Subject: [PATCH v2 3/5] ARM: dts: bcm2711: Add reserved memory template to hold firmware configuration Date: Fri, 18 Dec 2020 16:43:18 +0100 Message-Id: <20201218154320.28368-4-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 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org RPi4's co-processor will copy the board's bootloader[1] configuration into memory for the OS to consume. Specifically, for the bootloader configuration and upgrade user-space routines to query it through nvmem's sysfs interface. Introduce a reserved-memory area template for the co-processor to edit before booting the system so as for Linux not to overwrite that memory and to expose it as an nvmem device. Signed-off-by: Nicolas Saenz Julienne [1] https://www.raspberrypi.org/documentation/hardware/raspberrypi/bcm2711_bootloader_config.md --- Changes since v1: - Introduce compatible string - Change alias name to something more explicit arch/arm/boot/dts/bcm2711-rpi-4-b.dts | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/arch/arm/boot/dts/bcm2711-rpi-4-b.dts b/arch/arm/boot/dts/bcm2711-rpi-4-b.dts index 403bacf986eb..3b4ab947492a 100644 --- a/arch/arm/boot/dts/bcm2711-rpi-4-b.dts +++ b/arch/arm/boot/dts/bcm2711-rpi-4-b.dts @@ -25,6 +25,7 @@ aliases { emmc2bus = &emmc2bus; ethernet0 = &genet; pcie0 = &pcie0; + blconfig = &blconfig; }; leds { @@ -218,6 +219,22 @@ &pwm1 { status = "okay"; }; +&rmem { + /* + * RPi4's co-processor will copy the board's bootloader configuration + * into memory for the OS to consume. It'll also update this node with + * its placement information. + */ + blconfig: nvram@0 { + compatible = "raspberrypi,bootloader-config", "nvmem-rmem"; + #address-cells = <1>; + #size-cells = <1>; + reg = <0x0 0x0 0x0>; + no-map; + status = "disabled"; + }; +}; + /* SDHCI is used to control the SDIO for wireless */ &sdhci { #address-cells = <1>; -- 2.29.2