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    Subject[PATCH 09/10] mtd: st_spi_fsm: Dynamically setup flash device based on JEDEC ID
    Date
    Using previously added infrastructure we can now extract a device's JEDEC
    ID, compare it to a list of known and supported devices and make assumptions
    based on known characteristics of a given chip.

    Signed-off-by: Lee Jones <lee.jones@linaro.org>
    ---
    drivers/mtd/devices/st_spi_fsm.c | 24 +++++++++++++++++++++++-
    1 file changed, 23 insertions(+), 1 deletion(-)

    diff --git a/drivers/mtd/devices/st_spi_fsm.c b/drivers/mtd/devices/st_spi_fsm.c
    index 230024c..42dd4d9 100644
    --- a/drivers/mtd/devices/st_spi_fsm.c
    +++ b/drivers/mtd/devices/st_spi_fsm.c
    @@ -357,6 +357,7 @@ static int stfsm_read_jedec(struct stfsm *fsm, uint8_t *const jedec)

    static struct flash_info * stfsm_jedec_probe(struct stfsm *fsm)
    {
    + struct flash_info *info;
    u16 ext_jedec;
    u32 jedec;
    u8 id[5];
    @@ -380,6 +381,15 @@ static struct flash_info * stfsm_jedec_probe(struct stfsm *fsm)
    dev_dbg(fsm->dev, "JEDEC = 0x%08x [%02x %02x %02x %02x %02x]\n",
    jedec, id[0], id[1], id[2], id[3], id[4]);

    + for (info = flash_types; info->name; info++) {
    + if (info->jedec_id == jedec) {
    + if (info->ext_id && info->ext_id != ext_jedec)
    + continue;
    + return info;
    + }
    + }
    + dev_err(fsm->dev, "Unrecognized JEDEC id %06x\n", jedec);
    +
    return NULL;
    }

    @@ -490,6 +500,7 @@ static int stfsm_init(struct stfsm *fsm)
    static int stfsm_probe(struct platform_device *pdev)
    {
    struct device_node *np = pdev->dev.of_node;
    + struct flash_info *info;
    struct resource *res;
    struct stfsm *fsm;
    int ret;
    @@ -536,7 +547,9 @@ static int stfsm_probe(struct platform_device *pdev)
    }

    /* Detect SPI FLASH device */
    - stfsm_jedec_probe(fsm);
    + info = stfsm_jedec_probe(fsm);
    + if (!info)
    + return -ENODEV;

    platform_set_drvdata(pdev, fsm);

    @@ -545,6 +558,15 @@ static int stfsm_probe(struct platform_device *pdev)
    fsm->mtd.writesize = 4;
    fsm->mtd.writebufsize = fsm->mtd.writesize;
    fsm->mtd.flags = MTD_CAP_NORFLASH;
    + fsm->mtd.size = info->sector_size * info->n_sectors;
    + fsm->mtd.erasesize = info->sector_size;
    +
    + dev_err(&pdev->dev,
    + "Found serial flash device: %s\n"
    + " size = %llx (%lldMiB) erasesize = 0x%08x (%uKiB)\n",
    + info->name,
    + (long long)fsm->mtd.size, (long long)(fsm->mtd.size >> 20),
    + fsm->mtd.erasesize, (fsm->mtd.erasesize >> 10));

    return mtd_device_parse_register(&fsm->mtd, NULL, NULL, NULL, 0);
    }
    --
    1.8.1.2


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