[PATCH 3/4] mtd: mchp23k256: add partitioning support

Chris Packham
2017-05-17T05:40:06Z

Setting the of_node for the mtd device allows the generic mtd code to
setup the partitions. Additionally we must specify a non-zero erasesize
for the partitions to be writeable.

Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
---
drivers/mtd/devices/mchp23k256.c | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/drivers/mtd/devices/mchp23k256.c b/drivers/mtd/devices/mchp23k256.c
index 2542f5b8b63f..02c6b9dcbd3e 100644
--- a/drivers/mtd/devices/mchp23k256.c
+++ b/drivers/mtd/devices/mchp23k256.c
@@ -143,6 +143,7 @@ static int mchp23k256_probe(struct spi_device *spi)

data = dev_get_platdata(&spi->dev);

+ mtd_set_of_node(&flash->mtd, spi->dev.of_node);
flash->mtd.dev.parent = &spi->dev;
flash->mtd.type = MTD_RAM;
flash->mtd.flags = MTD_CAP_RAM;
@@ -151,6 +152,10 @@ static int mchp23k256_probe(struct spi_device *spi)
flash->mtd._read = mchp23k256_read;
flash->mtd._write = mchp23k256_write;

+ flash->mtd.erasesize = PAGE_SIZE;
+ while (flash->mtd.size & (flash->mtd.erasesize - 1))
+ flash->mtd.erasesize >>= 1;
+
err = mtd_device_register(&flash->mtd, data ? data->parts : NULL,
data ? data->nr_parts : 0);
if (err)
--
2.11.0.24.ge6920cf