This patch allows to read the REV_ID register in SPI mode and consequently
to properly detect the max3109. Indeed in SPI mode, this register is only
accessible by using indirect addressing.
Signed-off-by: Gregory Hermant <gregory.hermant@xxxxxxxxxxxxxxxxx>
---
drivers/tty/serial/max310x.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/tty/serial/max310x.c b/drivers/tty/serial/max310x.c
index 82573dc..e7cb897 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);
--
1.7.9.5
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