linux-kernel - [PATCH] mtd: ofpart: Assign device node to partitions parsed with ofpart

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Message-Id: <1464136660-13222-1-git-send-email-moritz.fischer@ettus.com>
Date:	Tue, 24 May 2016 17:37:40 -0700
From:	Moritz Fischer <moritz.fischer@...us.com>
To:	dwmw2@...radead.org
Cc:	computersforpeace@...il.com, linux-mtd@...ts.infradead.org,
	linux-kernel@...r.kernel.org, moritz.fischer.private@...il.com,
	Moritz Fischer <moritz.fischer@...us.com>
Subject: [PATCH] mtd: ofpart: Assign device node to partitions parsed with ofpart

This patch adds a struct device_node pointer to struct mtd_partition.
Partitions parsed via ofpart can now be referenced via devicetree.

Cc: David Woodhouse <dwmw2@...radead.org>
Cc: Brian Norris <computersforpeace@...il.com>

Signed-off-by: Moritz Fischer <moritz.fischer@...us.com>
---
Hi all,

during my work on another patch series for supporting
otp regions as nvmem providers via dt (follow up series),
I realized we don't actually assign node pointers.
While not used for ofpart atm, I can see cases where having
the pointer is useful to reference raw mtd partitions.
I can also (re)submit this as part of my upcoming series for
nvmem / otp support

Cheers,

Moritz

---
 drivers/mtd/mtdpart.c          | 1 +
 drivers/mtd/ofpart.c           | 1 +
 include/linux/mtd/partitions.h | 4 ++++
 3 files changed, 6 insertions(+)

diff --git a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c
index 6778ba2..3af9cf5 100644
--- a/drivers/mtd/mtdpart.c
+++ b/drivers/mtd/mtdpart.c
@@ -439,6 +439,7 @@ static struct mtd_part *allocate_partition(struct mtd_info *master,
 
 	slave->mtd.name = name;
 	slave->mtd.owner = master->owner;
+	slave->mtd.dev.of_node = part->node;
 
 	/* NOTE: Historically, we didn't arrange MTDs as a tree out of
 	 * concern for showing the same data in multiple partitions.
diff --git a/drivers/mtd/ofpart.c b/drivers/mtd/ofpart.c
index 6127ee6..caeaef0 100644
--- a/drivers/mtd/ofpart.c
+++ b/drivers/mtd/ofpart.c
@@ -108,6 +108,7 @@ static int parse_ofpart_partitions(struct mtd_info *master,
 
 		parts[i].offset = of_read_number(reg, a_cells);
 		parts[i].size = of_read_number(reg + a_cells, s_cells);
+		parts[i].node = pp;
 
 		partname = of_get_property(pp, "label", &len);
 		if (!partname)
diff --git a/include/linux/mtd/partitions.h b/include/linux/mtd/partitions.h
index 70736e1..51d36ac 100644
--- a/include/linux/mtd/partitions.h
+++ b/include/linux/mtd/partitions.h
@@ -31,6 +31,9 @@
  * 	master MTD flag set for the corresponding MTD partition.
  * 	For example, to force a read-only partition, simply adding
  * 	MTD_WRITEABLE to the mask_flags will do the trick.
+ * node: contains device node pointer, necessary to reference device using
+ *	devicetree.
+
  *
  * Note: writeable partitions require their size and offset be
  * erasesize aligned (e.g. use MTDPART_OFS_NEXTBLK).
@@ -41,6 +44,7 @@ struct mtd_partition {
 	uint64_t size;			/* partition size */
 	uint64_t offset;		/* offset within the master MTD space */
 	uint32_t mask_flags;		/* master MTD flags to mask out for this partition */
+	struct device_node *node;	/* pointer to the device node */
 };
 
 #define MTDPART_OFS_RETAIN	(-3)
-- 
2.5.5