lwn.git/Documentation/hwmon/lm90.rst, branch v6.9-rc4

hwmon: (lm90) Add support and detection of Philips/NXP NE1618

2022-07-13T15:38:19+00:00

NE1618 is similar to NE1617 but supports manufacturer and chip ID registers as well as 11 bit external temperature resolution. Signed-off-by: Guenter Roeck

hwmon: (lm90) Add explicit support for ADM1020

2022-07-13T15:38:19+00:00

ADM1020 is compatible with ADM1021 but has a separate chip revision and a limited I2C address range. Signed-off-by: Guenter Roeck

hwmon: (lm90) Add support for ON Semiconductor NCT218

2022-07-13T15:38:18+00:00

NCT218 is compatible to NCT72 and NCT214. It also supports PEC (packet error checking). Similar to NCT72 and NCT214, PEC support is undocumented. Unlike NCT214 and NCT72, NCT218 does not support the undocumented secondary chip and manufacturer ID registers at 0x3e and 0x3f and returns 0x00 when reading those registers. The value for the chip revision register is not documented but was observed to be 0xca. Use that information to improve chip detection accuracy. Signed-off-by: Guenter Roeck

hwmon: (lm90) Add support for ON Semiconductor NCT214 and NCT72

2022-07-13T15:38:18+00:00

NCT214 and NCT72 are compatible to ADT7461/ADT7461A but have full PEC (packet error checking) support. PEC support is undocumented. Both chips support the undocumented secondary chip and manufacturer ID registers at 0x3e and 0x3f, and return 0x61 as chip ID. Use this information to improve the accuracy of chip detection code. Signed-off-by: Guenter Roeck

hwmon: (lm90) Add explicit support for NCT210

2022-07-13T15:38:18+00:00

Unlike ADM1023 and compatible chips, NCT210 does not support a temperature offset register. A real chip was found to have a chip revision of 0x3f. Use it to detect NCT210 explicitly. Signed-off-by: Guenter Roeck

hwmon: (lm90) Add remaining chips supported by adm1021 driver

2022-07-13T15:38:18+00:00

All chips supported by the ADM1021 driver are also supported by the LM90 driver. Make that support official. After this change, the adm1021 driver is only needed if the lm90 driver is disabled. Also, the adm1021 driver misdetects a variety of chips as MAX1617A, which is unwanted if any of those chips is in the system. For this reason. make the adm1021 driver dependent on !SENSORS_LM90 to show that it is not needed if the lm90 driver is enabled, and to avoid misdetection if a chip supported by the lm90 driver is in the system. Devicetree nodes are not added for the added chips since it is quite unlikely that such old chips will ever be used in a devicetree based system. They can be added later if needed. Signed-off-by: Guenter Roeck

hwmon: (lm90) Add support for ADM1021, ADM1021A, and ADM1023

2022-07-13T15:38:18+00:00

Both chips are quite similar to other chips of this series, so add support for them to the lm90 driver. Also mention ON Semiconductor NCT210, which is pin and register compatible to ADM1021A. None of the chips support the secondary manufacturer and chip ID registers at 0x3e and 0x3f, but return 0 when reading from those registers. Use that information to improve the accuracy of chip detection code. Devicetree nodes are not added for the added chips since it is quite unlikely that such old chips will ever be used in a devicetree based system. They can be added later if needed. Signed-off-by: Guenter Roeck

hwmon: (lm90) Support MAX1617 and LM84

2022-07-13T15:38:18+00:00

MAX1617 and LM84 are stripped-down versions of LM90, so they can easily be supported by the LM90 driver. The most difficult part is chip detection, since those old chips do not support manufacturer ID or chip ID registers. The "alarms" attribute is enabled for both chips to match the functionality of the adm1021 driver. Chip detection was improved and is less prone to misdetection than the chip detection in the adm1021 driver. Devicetree nodes are not added for the added chips since it is quite unlikely that such old chips will ever be used in a devicetree based system. They can be added later if needed. Signed-off-by: Guenter Roeck

hwmon: (lm90) Add support for MAX6642

2022-07-13T15:38:18+00:00

MAX6642 is a reduced version of LM90 with no low limits and no conversion rate register. Its alert functionality is broken, similar to many other chips supported by the lm90 driver. After this change, the stand-alone max6642 driver is only needed if the lm90 driver is disabled. Make it dependent on SENSORS_LM90=n to show that it is not needed if the lm90 driver is enabled. 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

hwmon: (lm90) Add support for MAX6690

2022-07-13T15:38:18+00:00

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