From patchwork Wed Jul 19 22:01:14 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Golle X-Patchwork-Id: 13319532 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 09F10C001B0 for ; Wed, 19 Jul 2023 22:02:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229651AbjGSWCq (ORCPT ); Wed, 19 Jul 2023 18:02:46 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42326 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229503AbjGSWCq (ORCPT ); Wed, 19 Jul 2023 18:02:46 -0400 Received: from pidgin.makrotopia.org (pidgin.makrotopia.org [185.142.180.65]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 86AFB199A; Wed, 19 Jul 2023 15:02:43 -0700 (PDT) Received: from local by pidgin.makrotopia.org with esmtpsa (TLS1.3:TLS_AES_256_GCM_SHA384:256) (Exim 4.96) (envelope-from ) id 1qMFEZ-0008I7-1O; Wed, 19 Jul 2023 22:01:23 +0000 Date: Wed, 19 Jul 2023 23:01:14 +0100 From: Daniel Golle To: Jens Axboe , Ulf Hansson , Miquel Raynal , Richard Weinberger , Vignesh Raghavendra , Dave Chinner , Matthew Wilcox , Thomas =?iso-8859-1?q?Wei=DFschuh?= , Jan Kara , Daniel Golle , Damien Le Moal , Ming Lei , Min Li , Christian Loehle , Adrian Hunter , Hannes Reinecke , Jack Wang , Florian Fainelli , Yeqi Fu , Avri Altman , Hans de Goede , Ye Bin , Greg Kroah-Hartman , =?utf-8?b?UmFmYcWCIE1pxYJl?= =?utf-8?b?Y2tp?= , linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mmc@vger.kernel.org, linux-mtd@lists.infradead.org Subject: [RFC PATCH 0/6] nvmem: add block device NVMEM provider Message-ID: MIME-Version: 1.0 Content-Disposition: inline Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org On embedded devices using an eMMC it is common that one or more (hw/sw) partitions on the eMMC are used to store MAC addresses and Wi-Fi calibration EEPROM data. Implement an NVMEM provider backed by block devices as typically the NVMEM framework is used to have kernel drivers read and use binary data from EEPROMs, efuses, flash memory (MTD), ... In order to be able to reference hardware partitions on an eMMC, add code to bind each hardware partition to a specific firmware subnode. This series is meant to open the discussion on how exactly the device tree schema for block devices and partitions may look like, and even if using the block layer to back the NVMEM device is at all the way to go -- to me it seemed to be a good solution because it will be reuable e.g. for NVMe. Daniel Golle (6): mmc: core: set card fwnode_handle mmc: block: set fwnode of disk devices block: add new genhd flag GENHD_FL_NO_NVMEM mtd: blkdevs: set GENHD_FL_NO_NVMEM mtd: ubi: block: set GENHD_FL_NO_NVMEM block: implement NVMEM provider block/Kconfig | 8 ++ block/Makefile | 1 + block/blk-nvmem.c | 187 ++++++++++++++++++++++++++++++++++++++ block/blk.h | 13 +++ block/genhd.c | 2 + block/partitions/core.c | 2 + drivers/mmc/core/block.c | 8 ++ drivers/mmc/core/bus.c | 2 + drivers/mtd/mtd_blkdevs.c | 1 + drivers/mtd/ubi/block.c | 2 +- include/linux/blkdev.h | 3 + 11 files changed, 228 insertions(+), 1 deletion(-) create mode 100644 block/blk-nvmem.c