linux-kernel - [PATCH 4/6] block2mtd: attach device OF node to MTD device

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Message-ID: <20240804114108.1893-5-ansuelsmth@gmail.com>
Date: Sun,  4 Aug 2024 13:41:04 +0200
From: Christian Marangi <ansuelsmth@...il.com>
To: Ulf Hansson <ulf.hansson@...aro.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Miquel Raynal <miquel.raynal@...tlin.com>,
	Richard Weinberger <richard@....at>,
	Vignesh Raghavendra <vigneshr@...com>,
	Joern Engel <joern@...ybastard.org>,
	Keith Busch <kbusch@...nel.org>,
	Jens Axboe <axboe@...nel.dk>,
	Christoph Hellwig <hch@....de>,
	Sagi Grimberg <sagi@...mberg.me>,
	Christian Marangi <ansuelsmth@...il.com>,
	Florian Fainelli <f.fainelli@...il.com>,
	Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
	Wolfram Sang <wsa+renesas@...g-engineering.com>,
	linux-mmc@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-mtd@...ts.infradead.org,
	linux-nvme@...ts.infradead.org
Subject: [PATCH 4/6] block2mtd: attach device OF node to MTD device

Attach device OF node to MTD device if defined and the root blockdev is
being used to add support for partitions defined in DT node.

This permits the usage of fixed-partition or alternative parser with the
use of block2mtd module.

Signed-off-by: Christian Marangi <ansuelsmth@...il.com>
---
 drivers/mtd/devices/block2mtd.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/mtd/devices/block2mtd.c b/drivers/mtd/devices/block2mtd.c
index b06c8dd51562..0c4ecea51717 100644
--- a/drivers/mtd/devices/block2mtd.c
+++ b/drivers/mtd/devices/block2mtd.c
@@ -324,6 +324,15 @@ static struct block2mtd_dev *add_device(char *devname, int erase_size,
 	dev->mtd.priv = dev;
 	dev->mtd.owner = THIS_MODULE;
 
+	/*
+	 * Check if we are using root blockdev.
+	 * If it's the case, connect the MTD of_node to the ddev parent
+	 * to support providing partition in DT node.
+	 */
+	ddev = disk_to_dev(dev->blkdev->bd_disk);
+	if (ddev == &dev->blkdev->bd_device)
+		dev->mtd.dev.of_node = of_node_get(ddev->parent->of_node);
+
 	if (mtd_device_register(&dev->mtd, NULL, 0)) {
 		/* Device didn't get added, so free the entry */
 		goto err_destroy_mutex;
@@ -337,6 +346,7 @@ static struct block2mtd_dev *add_device(char *devname, int erase_size,
 	return dev;
 
 err_destroy_mutex:
+	of_node_put(dev->mtd.dev.of_node);
 	mutex_destroy(&dev->write_mutex);
 err_free_block2mtd:
 	block2mtd_free_device(dev);
@@ -515,6 +525,7 @@ static void block2mtd_exit(void)
 		struct block2mtd_dev *dev = list_entry(pos, typeof(*dev), list);
 		block2mtd_sync(&dev->mtd);
 		mtd_device_unregister(&dev->mtd);
+		of_node_put(dev->mtd.dev.of_node);
 		mutex_destroy(&dev->write_mutex);
 		pr_info("mtd%d: [%s] removed\n",
 			dev->mtd.index,
-- 
2.45.2