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[93.34.90.105]) by smtp.googlemail.com with ESMTPSA id 5b1f17b1804b1-42f79ead1absm29218245e9.17.2024.10.02.15.13.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 02 Oct 2024 15:13:50 -0700 (PDT) From: Christian Marangi To: Jens Axboe , Jonathan Corbet , Ulf Hansson , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Christian Marangi , Daniel Golle , INAGAKI Hiroshi , Christian Brauner , Al Viro , Ming Lei , Li Lingfeng , Christian Heusel , Avri Altman , Linus Walleij , Adrian Hunter , Riyan Dhiman , Mikko Rapeli , Jorge Ramirez-Ortiz , Li Zhijian , Dominique Martinet , Jens Wiklander , Christophe JAILLET , linux-block@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mmc@vger.kernel.org, devicetree@vger.kernel.org, Lorenzo Bianconi , Miquel Raynal , upstream@airoha.com, Christoph Hellwig Subject: [PATCH v6 4/6] mmc: block: attach partitions fwnode if found in mmc-card Date: Thu, 3 Oct 2024 00:11:44 +0200 Message-ID: <20241002221306.4403-5-ansuelsmth@gmail.com> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20241002221306.4403-1-ansuelsmth@gmail.com> References: <20241002221306.4403-1-ansuelsmth@gmail.com> Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Attach partitions fwnode if found in mmc-card and register disk with it. This permits block partition to reference the node and register a partition table defined in DT for the special case for embedded device that doesn't have a partition table flashed but have an hardcoded partition table passed from the system. JEDEC BOOT partition boot0/boot1 are supported but in DT we refer with the JEDEC name of boot1 and boot2 to better adhere to documentation. Also JEDEC GP partition gp0/1/2/3 are supported but in DT we refer with the JEDEC name of gp1/2/3/4 to better adhere to documentration. Signed-off-by: Christian Marangi Reviewed-by: Linus Walleij --- drivers/mmc/core/block.c | 55 +++++++++++++++++++++++++++++++++++++++- 1 file changed, 54 insertions(+), 1 deletion(-) diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c index f58bea534004..d7eadf2b407f 100644 --- a/drivers/mmc/core/block.c +++ b/drivers/mmc/core/block.c @@ -2501,6 +2501,56 @@ static inline int mmc_blk_readonly(struct mmc_card *card) !(card->csd.cmdclass & CCC_BLOCK_WRITE); } +/* + * Search for a declared partitions node for the disk in mmc-card related node. + * + * This is to permit support for partition table defined in DT in special case + * where a partition table is not written in the disk and is expected to be + * passed from the running system. + * + * For the user disk, "partitions" node is searched. + * For the special HW disk, "partitions-" node with the appended name is used + * following this conversion table (to adhere to JEDEC naming) + * - boot0 -> partitions-boot1 + * - boot1 -> partitions-boot2 + * - gp0 -> partitions-gp1 + * - gp1 -> partitions-gp2 + * - gp2 -> partitions-gp3 + * - gp3 -> partitions-gp4 + */ +static struct fwnode_handle *mmc_blk_get_partitions_node(struct device *mmc_dev, + const char *subname) +{ + const char *node_name = "partitions"; + + if (subname) { + mmc_dev = mmc_dev->parent; + + /* + * Check if we are allocating a BOOT disk boot0/1 disk. + * In DT we use the JEDEC naming boot1/2. + */ + if (!strcmp(subname, "boot0")) + node_name = "partitions-boot1"; + if (!strcmp(subname, "boot1")) + node_name = "partitions-boot2"; + /* + * Check if we are allocating a GP disk gp0/1/2/3 disk. + * In DT we use the JEDEC naming gp1/2/3/4. + */ + if (!strcmp(subname, "gp0")) + node_name = "partitions-gp1"; + if (!strcmp(subname, "gp1")) + node_name = "partitions-gp2"; + if (!strcmp(subname, "gp2")) + node_name = "partitions-gp3"; + if (!strcmp(subname, "gp3")) + node_name = "partitions-gp4"; + } + + return device_get_named_child_node(mmc_dev, node_name); +} + static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card, struct device *parent, sector_t size, @@ -2509,6 +2559,7 @@ static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card, int area_type, unsigned int part_type) { + struct fwnode_handle *disk_fwnode; struct mmc_blk_data *md; int devidx, ret; char cap_str[10]; @@ -2610,7 +2661,9 @@ static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card, /* used in ->open, must be set before add_disk: */ if (area_type == MMC_BLK_DATA_AREA_MAIN) dev_set_drvdata(&card->dev, md); - ret = device_add_disk(md->parent, md->disk, mmc_disk_attr_groups); + disk_fwnode = mmc_blk_get_partitions_node(parent, subname); + ret = add_disk_fwnode(md->parent, md->disk, mmc_disk_attr_groups, + disk_fwnode); if (ret) goto err_put_disk; return md;