hwmon: (lm90) Add partial PEC support for ADT7461

Revision 0 of the ADT7461 datasheet suggests that the chip supports PEC (packet error checking). This information is gone in later versions of the datasheet. Experiments show that PEC support on ADT7461 is similar to PEC support in ADM1032, ie it is only supported for read operations. Add support for it to the driver. Signed-off-by: Guenter Roeck <linux@roeck-us.net>
mariux64 · Jul 13, 2022 · 425f5b5 · 425f5b5
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diff --git a/Documentation/hwmon/lm90.rst b/Documentation/hwmon/lm90.rst
@@ -322,6 +322,7 @@ ADM1032:
 ADT7461, ADT7461A, NCT1008:
   * Extended temperature range (breaks compatibility)
   * Lower resolution for remote temperature
+  * SMBus PEC support for Write Byte and Receive Byte transactions.
 
 MAX6654:
   * Better local resolution

diff --git a/drivers/hwmon/lm90.c b/drivers/hwmon/lm90.c
@@ -356,7 +356,7 @@ static const struct lm90_params lm90_params[] = {
 	[adt7461] = {
 		.flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT
 		  | LM90_HAVE_BROKEN_ALERT | LM90_HAVE_EXTENDED_TEMP
-		  | LM90_HAVE_CRIT,
+		  | LM90_HAVE_CRIT | LM90_HAVE_PARTIAL_PEC,
 		.alert_alarms = 0x7c,
 		.max_convrate = 10,
 	},