According to the March 2013 revision of the LM82 datasheet, the latest
LM82 die revision is 0x03. This was confirmed and observed with a real
chip. Further details in this revision of the LM82 datasheet suggest that
LM82 is now just a repackaged LM83. Such versions of LM82 will be detected
as LM83. Add comment to the code explaining why this may happen.
Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
---
drivers/hwmon/lm83.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/drivers/hwmon/lm83.c b/drivers/hwmon/lm83.c
index 82d7ef264f6f..d9ee01ca8aed 100644
--- a/drivers/hwmon/lm83.c
+++ b/drivers/hwmon/lm83.c
@@ -334,6 +334,14 @@ static int lm83_detect(struct i2c_client *client,
chip_id = i2c_smbus_read_byte_data(client, LM83_REG_R_CHIP_ID);
switch (chip_id) {
case 0x03:
+ /*
+ * According to the LM82 datasheet dated March 2013, recent
+ * revisions of LM82 have a die revision of 0x03. This was
+ * confirmed with a real chip. Further details in this revision
+ * of the LM82 datasheet strongly suggest that LM82 is just a
+ * repackaged LM83. It is therefore impossible to distinguish
+ * those chips from LM83, and they will be misdetected as LM83.
+ */
name = "lm83";
break;
case 0x01:
--
2.33.0
