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| author | Guenter Roeck <linux@roeck-us.net> | 2021-11-13 09:03:31 +0300 |
|---|---|---|
| committer | Guenter Roeck <linux@roeck-us.net> | 2022-07-13 18:38:18 +0300 |
| commit | 399a8a0046cfc878203b0a1c990f81c8153757f3 (patch) | |
| tree | b29c2a93a1490f5597612485d9c7a2fe50c025e6 | |
| parent | 9888775be8c07e134c1c5b281ee0a4e01773aed1 (diff) | |
| download | linux-399a8a0046cfc878203b0a1c990f81c8153757f3.tar.xz | |
hwmon: (lm90) Add support for MAX6690
MAX6690 is all but identical to MAX6654. Revision 1 of its
datasheet lists the same chip ID as MAX6654, and a chip labeled
MAX6654 was found to have the chip ID listed as MAX6690 chip ID
in Revision 2 of its datasheet.
A devicetree node is not added for this chip since it is quite unlikely
that such an old chip will ever be used in a devicetree based system.
It can be added later if needed.
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
| -rw-r--r-- | Documentation/hwmon/lm90.rst | 2 | ||||
| -rw-r--r-- | drivers/hwmon/lm90.c | 17 |
2 files changed, 17 insertions, 2 deletions
diff --git a/Documentation/hwmon/lm90.rst b/Documentation/hwmon/lm90.rst index 53429f79b819..45bc333a1219 100644 --- a/Documentation/hwmon/lm90.rst +++ b/Documentation/hwmon/lm90.rst @@ -370,7 +370,7 @@ MAX6648, MAX6692: * Better local resolution * Unsigned temperature -MAX6654: +MAX6654, MAX6690: * Better local resolution * Selectable address * Remote sensor type selection diff --git a/drivers/hwmon/lm90.c b/drivers/hwmon/lm90.c index 66d706d665bd..1f5e2dd765d8 100644 --- a/drivers/hwmon/lm90.c +++ b/drivers/hwmon/lm90.c @@ -42,7 +42,8 @@ * accordingly, and is done during initialization. Extended precision is only * available at conversion rates of 1 Hz and slower. Note that extended * precision is not enabled by default, as this driver initializes all chips - * to 2 Hz by design. + * to 2 Hz by design. The driver also supports MAX6690, which is practically + * identical to MAX6654. * * This driver also supports the MAX6646, MAX6647, MAX6648, MAX6649 and * MAX6692 chips made by Maxim. These are again similar to the LM86, @@ -237,6 +238,7 @@ static const struct i2c_device_id lm90_id[] = { { "max6659", max6659 }, { "max6680", max6680 }, { "max6681", max6680 }, + { "max6690", max6654 }, { "max6692", max6648 }, { "max6695", max6696 }, { "max6696", max6696 }, @@ -1718,6 +1720,19 @@ static const char *lm90_detect_maxim(struct i2c_client *client, int chip_id, if (!(config1 & 0x07) && convrate <= 0x07) name = "max6654"; break; + case 0x09: + /* + * The chip_id of the MAX6690 holds the revision of the chip. + * The lowest 3 bits of the config1 register are unused and + * should return zero when read. + * Note that MAX6654 and MAX6690 are practically the same chips. + * The only diference is the rated accuracy. Rev. 1 of the + * MAX6690 datasheet lists a chip ID of 0x08, and a chip labeled + * MAX6654 was observed to have a chip ID of 0x09. + */ + if (!(config1 & 0x07) && convrate <= 0x07) + name = "max6690"; + break; case 0x4d: /* * The MAX6657, MAX6658 and MAX6659 do NOT have a chip_id |