[PATCH v1 1/2] mtd: Add flash_node in struct mtd_info

[Patrice Chotard]

Currently, add_mtd_partitions_of() can be used only if dev field of
mtd_info struct is populated. It's the case, for example, for a spi nor
flash, which has a DT compatible "jedec,spi-nor" and an associated
device. mtd->dev is populated in spi_nor_scan().

But in case of a raw nand node, mtd_info's dev field can't be populated
as flash node has no compatible, so no associated device.
add_mtd_partitions_of() can't be used to parse "partitions" subnode.

To remove this constraint, add an ofnode field in mtd_info struct
which reference the DT flash node. This new field is populated by
nand_scan_tail(). This new field will be used by add_mtd_partitions_of()
to parse the flash node for "partitions" defined in DT.

Signed-off-by: Patrice Chotard <patrice.chotard at foss.st.com>
Cc: Farhan Ali <farhan.ali at broadcom.com>
Cc: Heinrich Schuchardt <xypron.glpk at gmx.de>
Cc: Jagan Teki <jagan at amarulasolutions.com>
Cc: Marek Behun <marek.behun at nic.cz>
Cc: Miquel Raynal <miquel.raynal at bootlin.com>
Cc: Simon Glass <sjg at chromium.org>
Cc: Wolfgang Denk <wd at denx.de>
---

 drivers/mtd/nand/raw/nand_base.c | 1 +
 include/linux/mtd/mtd.h          | 1 +
 2 files changed, 2 insertions(+)

diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/nand_base.c
index f7616985d9..a007603df1 100644
--- a/drivers/mtd/nand/raw/nand_base.c
+++ b/drivers/mtd/nand/raw/nand_base.c
@@ -5257,6 +5257,7 @@ int nand_scan_tail(struct mtd_info *mtd)
 		break;
 	}
 
+	mtd->flash_node = chip->flash_node;
 	/* Fill in remaining MTD driver data */
 	mtd->type = nand_is_slc(chip) ? MTD_NANDFLASH : MTD_MLCNANDFLASH;
 	mtd->flags = (chip->options & NAND_ROM) ? MTD_CAP_ROM :
diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h
index 7455400981..af45e63bf9 100644
--- a/include/linux/mtd/mtd.h
+++ b/include/linux/mtd/mtd.h
@@ -305,6 +305,7 @@ struct mtd_info {
 	struct device dev;
 #else
 	struct udevice *dev;
+	ofnode flash_node;
 #endif
 	int usecount;
 
-- 
2.17.1