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hwmon: (lm83) Explain why LM82 may be misdetected as LM83 

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@roeck-us.net>
This commit is contained in:
Guenter Roeck 2021-12-24 11:31:32 -08:00
parent 4d63c2d31a
commit 913ac02ade
1 changed files with 8 additions and 0 deletions
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8
drivers/hwmon/lm83.c
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@ -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: