linux-kernel - [RFC PATCH 2/6] mtd: part: pass OF node to the MTD partition layer

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Date:	Thu, 30 Jul 2015 15:50:21 +0200
From:	Boris Brezillon <boris.brezillon@...e-electrons.com>
To:	David Woodhouse <dwmw2@...radead.org>,
	Brian Norris <computersforpeace@...il.com>,
	linux-mtd@...ts.infradead.org
Cc:	linux-kernel@...r.kernel.org, Roy Spliet <r.spliet@...imaker.com>,
	Richard Weinberger <richard@....at>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	linux-sunxi@...glegroups.com, linux-arm-kernel@...ts.infradead.org,
	Boris Brezillon <boris.brezillon@...e-electrons.com>
Subject: [RFC PATCH 2/6] mtd: part: pass OF node to the MTD partition layer

Pass the OF node attached an MTD partition so that specific MTD device
implementations can extract extra information from the DT definition.

Signed-off-by: Boris Brezillon <boris.brezillon@...e-electrons.com>
---
 drivers/mtd/mtdpart.c          | 2 ++
 drivers/mtd/ofpart.c           | 1 +
 include/linux/mtd/partitions.h | 3 ++-
 3 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c
index 9a45230..c2e5920 100644
--- a/drivers/mtd/mtdpart.c
+++ b/drivers/mtd/mtdpart.c
@@ -362,6 +362,8 @@ static struct mtd_part *allocate_partition(struct mtd_info *master,
 		return ERR_PTR(-ENOMEM);
 	}
 
+	slave->mtd.dev.of_node = part->of_node;
+
 	/* set up the MTD object for this partition */
 	slave->mtd.type = master->type;
 	slave->mtd.flags = master->flags & ~part->mask_flags;
diff --git a/drivers/mtd/ofpart.c b/drivers/mtd/ofpart.c
index aa26c32..8a06cfb 100644
--- a/drivers/mtd/ofpart.c
+++ b/drivers/mtd/ofpart.c
@@ -73,6 +73,7 @@ static int parse_ofpart_partitions(struct mtd_info *master,
 			continue;
 		}
 
+		(*pparts)[i].of_node = pp;
 		a_cells = of_n_addr_cells(pp);
 		s_cells = of_n_size_cells(pp);
 		(*pparts)[i].offset = of_read_number(reg, a_cells);
diff --git a/include/linux/mtd/partitions.h b/include/linux/mtd/partitions.h
index 6a35e6d..e4ff8a3 100644
--- a/include/linux/mtd/partitions.h
+++ b/include/linux/mtd/partitions.h
@@ -12,6 +12,7 @@
 #include <linux/types.h>
 
 
+
 /*
  * Partition definition structure:
  *
@@ -42,6 +43,7 @@ struct mtd_partition {
 	uint64_t offset;		/* offset within the master MTD space */
 	uint32_t mask_flags;		/* master MTD flags to mask out for this partition */
 	struct nand_ecclayout *ecclayout;	/* out of band layout for this partition (NAND only) */
+	struct device_node *of_node;	/* OF node attached to this partition (optional) */
 };
 
 #define MTDPART_OFS_RETAIN	(-3)
@@ -63,7 +65,6 @@ struct mtd_part_parser_data {
 	struct device_node *of_node;
 };
 
-
 /*
  * Functions dealing with the various ways of partitioning the space
  */
-- 
1.9.1

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