diff options
Diffstat (limited to 'drivers/tty/serial/max310x.c')
| -rw-r--r-- | drivers/tty/serial/max310x.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/tty/serial/max310x.c b/drivers/tty/serial/max310x.c index 0041a64cc86e..4cdc555604c9 100644 --- a/drivers/tty/serial/max310x.c +++ b/drivers/tty/serial/max310x.c @@ -346,10 +346,13 @@ static int max3109_detect(struct device *dev) unsigned int val = 0; int ret; - ret = regmap_read(s->regmap, MAX310X_REVID_REG, &val); + ret = regmap_write(s->regmap, MAX310X_GLOBALCMD_REG, + MAX310X_EXTREG_ENBL); if (ret) return ret; + regmap_read(s->regmap, MAX310X_REVID_EXTREG, &val); + regmap_write(s->regmap, MAX310X_GLOBALCMD_REG, MAX310X_EXTREG_DSBL); if (((val & MAX310x_REV_MASK) != MAX3109_REV_ID)) { dev_err(dev, "%s ID 0x%02x does not match\n", s->devtype->name, val); |