mtd: move support for struct flash_platform_data into m25p80

This "type" seems to be an extra hint for m25p80 about the flash. Some
archs register flash_platform_data with "name" set to "m25p80" and then
with a real flash name set in "type". It seems to be a trick specific
to the m25p80 so let's move it out of spi-nor.
Btw switch to the spi_nor_match_id instead of iterating spi_nor_ids.

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c
index ed7e0a1..dcda628 100644 (file)
--- a/drivers/mtd/devices/m25p80.c
+++ b/drivers/mtd/devices/m25p80.c
@@ -193,11 +193,14 @@ static int m25p_probe(struct spi_device *spi)
 {
        struct mtd_part_parser_data     ppdata;
        struct flash_platform_data      *data;
+       const struct spi_device_id *id = NULL;
        struct m25p *flash;
        struct spi_nor *nor;
        enum read_mode mode = SPI_NOR_NORMAL;
        int ret;
 
+       data = dev_get_platdata(&spi->dev);
+
        flash = devm_kzalloc(&spi->dev, sizeof(*flash), GFP_KERNEL);
        if (!flash)
                return -ENOMEM;
@@ -223,11 +226,26 @@ static int m25p_probe(struct spi_device *spi)
                mode = SPI_NOR_QUAD;
        else if (spi->mode & SPI_RX_DUAL)
                mode = SPI_NOR_DUAL;
-       ret = spi_nor_scan(nor, spi_get_device_id(spi), mode);
+
+       if (data && data->name)
+               flash->mtd.name = data->name;
+
+       /* For some (historical?) reason many platforms provide two different
+        * names in flash_platform_data: "name" and "type". Quite often name is
+        * set to "m25p80" and then "type" provides a real chip name.
+        * If that's the case, respect "type" and ignore a "name".
+        */
+       if (data && data->type)
+               id = spi_nor_match_id(data->type);
+
+       /* If we didn't get name from platform, simply use "modalias". */
+       if (!id)
+               id = spi_get_device_id(spi);
+
+       ret = spi_nor_scan(nor, id, mode);
        if (ret)
                return ret;
 
-       data = dev_get_platdata(&spi->dev);
        ppdata.of_node = spi->dev.of_node;
 
        return mtd_device_parse_register(&flash->mtd, NULL, &ppdata,

diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
index 11459f6..ae16aa2 100644 (file)
--- a/drivers/mtd/spi-nor/spi-nor.c
+++ b/drivers/mtd/spi-nor/spi-nor.c
@@ -915,7 +915,6 @@ int spi_nor_scan(struct spi_nor *nor, const struct spi_device_id *id,
                        enum read_mode mode)
 {
        struct flash_info               *info;
-       struct flash_platform_data      *data;
        struct device *dev = nor->dev;
        struct mtd_info *mtd = nor->mtd;
        struct device_node *np = dev->of_node;
@@ -926,28 +925,6 @@ int spi_nor_scan(struct spi_nor *nor, const struct spi_device_id *id,
        if (ret)
                return ret;
 
-       /* Platform data helps sort out which chip type we have, as
-        * well as how this board partitions it.  If we don't have
-        * a chip ID, try the JEDEC id commands; they'll work for most
-        * newer chips, even if we don't recognize the particular chip.
-        */
-       data = dev_get_platdata(dev);
-       if (data && data->type) {
-               const struct spi_device_id *plat_id;
-
-               for (i = 0; i < ARRAY_SIZE(spi_nor_ids) - 1; i++) {
-                       plat_id = &spi_nor_ids[i];
-                       if (strcmp(data->type, plat_id->name))
-                               continue;
-                       break;
-               }
-
-               if (i < ARRAY_SIZE(spi_nor_ids) - 1)
-                       id = plat_id;
-               else
-                       dev_warn(dev, "unrecognized id %s\n", data->type);
-       }
-
        info = (void *)id->driver_data;
 
        if (info->jedec_id) {
@@ -985,11 +962,8 @@ int spi_nor_scan(struct spi_nor *nor, const struct spi_device_id *id,
                write_sr(nor, 0);
        }
 
-       if (data && data->name)
-               mtd->name = data->name;
-       else
+       if (!mtd->name)
                mtd->name = dev_name(dev);
-
        mtd->type = MTD_NORFLASH;
        mtd->writesize = 1;
        mtd->flags = MTD_CAP_NORFLASH;