To specify spi flash layouts by "mtdparts=..." in cmdline, we must
give mtd_info a fixed name, because the cmdlinepart's parser will
match the name of mtd_info given in cmdline.
Now, if it use DT, the mtd_info's name will be spi->dev->name. It
consists of spi_master->bus_num, and the spi_master->bus_num maybe
dynamically fetched. So, in this case, replace the component bus_num
with the physical address of spi master.
Signed-off-by: Hou Zhiqiang <b48...@freescale.com>
---
V5:
Rebase on the latest l2-mtd tree.
V4:
add check no-NULL for pointer of master's device node, and if it failed
to get physcial address of the master, then name the mtd_info by the
name of spi->dev.
V3:
Fix a bug, matching unsigned long long with "%llx".
V2:
1. Fix some code style issue.
2. Cast physical address to unsigned long long.
drivers/mtd/devices/m25p80.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c
index 1557d8f..329aa2c 100644
--- a/drivers/mtd/devices/m25p80.c
+++ b/drivers/mtd/devices/m25p80.c
@@ -26,6 +26,7 @@
#include <linux/spi/spi.h>
#include <linux/spi/flash.h>
#include <linux/mtd/spi-nor.h>
+#include <linux/of_address.h>
#define MAX_CMD_SIZE 6
struct m25p {
@@ -196,6 +197,8 @@ static int m25p_probe(struct spi_device *spi)
struct m25p *flash;
struct spi_nor *nor;
enum read_mode mode = SPI_NOR_NORMAL;
+ struct resource res;
+ struct device_node *mnp = spi->master->dev.of_node;
int ret;
flash = devm_kzalloc(&spi->dev, sizeof(*flash), GFP_KERNEL);
@@ -228,6 +231,17 @@ static int m25p_probe(struct spi_device *spi)
data = dev_get_platdata(&spi->dev);
ppdata.of_node = spi->dev.of_node;
+ if (mnp) {
+ ret = of_address_to_resource(mnp, 0, &res);
+ if (!ret) {
+ flash->mtd.name = kasprintf(GFP_KERNEL, "spi%llx.%d",
+ (unsigned long long)res.start,
+ spi->chip_select);
+ if (!flash->mtd.name)
+ return -ENOMEM;
+ }
+ }
+
return mtd_device_parse_register(&flash->mtd, NULL, &ppdata,
data ? data->parts : NULL,
data ? data->nr_parts : 0);
--
1.8.5
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