[PATCH 4/4] mtd: mchp23k256: Add support for mchp23lcv1024

Chris Packham
2017-05-17T05:39:42Z

The mchp23lcv1024 is software compatible with the mchp23k256, the
only difference (from a software point of view) is the size. There
is no way to detect the size so we must be told via a Device Tree.

Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
---
.../bindings/mtd/microchip,mchp23k256.txt | 2 +-
drivers/mtd/devices/mchp23k256.c | 21 +++++++++++++++++++--
2 files changed, 20 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/mtd/microchip,mchp23k256.txt b/Documentation/devicetree/bindings/mtd/microchip,mchp23k256.txt
index 25e5ad38b0f0..7328eb92a03c 100644
--- a/Documentation/devicetree/bindings/mtd/microchip,mchp23k256.txt
+++ b/Documentation/devicetree/bindings/mtd/microchip,mchp23k256.txt
@@ -3,7 +3,7 @@
Required properties:
- #address-cells, #size-cells : Must be present if the device has sub-nodes
representing partitions.
-- compatible : Must be "microchip,mchp23k256"
+- compatible : Must be one of "microchip,mchp23k256" or "microchip,mchp23lcv1024"
- reg : Chip-Select number
- spi-max-frequency : Maximum frequency of the SPI bus the chip can operate at

diff --git a/drivers/mtd/devices/mchp23k256.c b/drivers/mtd/devices/mchp23k256.c
index 02c6b9dcbd3e..d1eba587633c 100644
--- a/drivers/mtd/devices/mchp23k256.c
+++ b/drivers/mtd/devices/mchp23k256.c
@@ -21,6 +21,8 @@
#include <linux/spi/spi.h>
#include <linux/of_device.h>

+enum chips { mchp23k256, mchp23lcv1024 };
+
struct mchp23k256_flash {
struct spi_device *spi;
struct mutex lock;
@@ -128,6 +130,7 @@ static int mchp23k256_probe(struct spi_device *spi)
struct mchp23k256_flash *flash;
struct flash_platform_data *data;
int err;
+ enum chips chip;

flash = devm_kzalloc(&spi->dev, sizeof(*flash), GFP_KERNEL);
if (!flash)
@@ -143,15 +146,28 @@ static int mchp23k256_probe(struct spi_device *spi)

data = dev_get_platdata(&spi->dev);

+ if (spi->dev.of_node)
+ chip = (enum chips)of_device_get_match_data(&spi->dev);
+ else
+ chip = mchp23k256;
+
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;
flash->mtd.writesize = 1;
- flash->mtd.size = SZ_32K;
flash->mtd._read = mchp23k256_read;
flash->mtd._write = mchp23k256_write;

+ switch (chip){
+ case mchp23lcv1024:
+ flash->mtd.size = SZ_128K;
+ break;
+ default:
+ flash->mtd.size = SZ_32K;
+ break;
+ }
+
flash->mtd.erasesize = PAGE_SIZE;
while (flash->mtd.size & (flash->mtd.erasesize - 1))
flash->mtd.erasesize >>= 1;
@@ -172,7 +188,8 @@ static int mchp23k256_remove(struct spi_device *spi)
}

static const struct of_device_id mchp23k256_of_table[] = {
- { .compatible = "microchip,mchp23k256" },
+ { .compatible = "microchip,mchp23k256", .data = (void *)mchp23k256 },
+ { .compatible = "microchip,mchp23lcv1024", .data = (void *)mchp23lcv1024 },
{}
};
MODULE_DEVICE_TABLE(of, mchp23k256_of_table);
--
2.11.0.24.ge6920cf