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Message-ID: <20241001221931.9309-5-ansuelsmth@gmail.com>
Date: Wed, 2 Oct 2024 00:18:56 +0200
From: Christian Marangi <ansuelsmth@...il.com>
To: Jens Axboe <axboe@...nel.dk>,
Jonathan Corbet <corbet@....net>,
Ulf Hansson <ulf.hansson@...aro.org>,
Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>,
Christian Marangi <ansuelsmth@...il.com>,
INAGAKI Hiroshi <musashino.open@...il.com>,
Daniel Golle <daniel@...rotopia.org>,
Christian Brauner <brauner@...nel.org>,
Al Viro <viro@...iv.linux.org.uk>,
Ming Lei <ming.lei@...hat.com>,
Jan Kara <jack@...e.cz>,
Li Lingfeng <lilingfeng3@...wei.com>,
Christian Heusel <christian@...sel.eu>,
Avri Altman <avri.altman@....com>,
Adrian Hunter <adrian.hunter@...el.com>,
Linus Walleij <linus.walleij@...aro.org>,
Mikko Rapeli <mikko.rapeli@...aro.org>,
Riyan Dhiman <riyandhiman14@...il.com>,
Jorge Ramirez-Ortiz <jorge@...ndries.io>,
Dominique Martinet <dominique.martinet@...ark-techno.com>,
Jens Wiklander <jens.wiklander@...aro.org>,
Christophe JAILLET <christophe.jaillet@...adoo.fr>,
Li Zhijian <lizhijian@...itsu.com>,
linux-block@...r.kernel.org,
linux-doc@...r.kernel.org,
linux-kernel@...r.kernel.org,
linux-mmc@...r.kernel.org,
devicetree@...r.kernel.org,
Lorenzo Bianconi <lorenzo@...nel.org>,
Miquel Raynal <miquel.raynal@...tlin.com>,
upstream@...oha.com
Subject: [PATCH v5 4/6] mmc: block: attach partitions fwnode if found in mmc-card
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 <ansuelsmth@...il.com>
---
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..01c4ee223156 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 = device_add_of_disk(md->parent, md->disk, mmc_disk_attr_groups,
+ disk_fwnode);
if (ret)
goto err_put_disk;
return md;
--
2.45.2
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