diff options
| author | Ivan Zaentsev | 2020-09-04 19:00:04 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman | 2020-10-02 11:49:54 +0200 |
| commit | 9ace0b4dab1c3913810c50948d714afcbd2c767e (patch) | |
| tree | 2b582e74038935f0e9ec6260cd65e38ecf723b7e /Documentation | |
| parent | 021da53e65fdd0e1b8492c2670dd075c0ea910fc (diff) | |
w1: w1_therm: Add support for GXCAS GX20MH01 device.
GX20MH01 device shares family number 0x28 with DS18B20. The device
is generally compatible with DS18B20. Added are the lowest 2^-5, 2^-6
temperature bits in Config register; R2 bit in Config register
enabling 13 and 14 bit resolutions. It is powered up in 14 bit mode.
Signed-off-by: Ivan Zaentsev <ivan.zaentsev@wirenboard.ru>
Link: https://lore.kernel.org/r/20200904160004.87710-2-ivan.zaentsev@wirenboard.ru
Acked-by: Evgeniy Polyakov <zbr@ioremap.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-driver-w1_therm | 4 | ||||
| -rw-r--r-- | Documentation/w1/slaves/w1_therm.rst | 15 |
2 files changed, 14 insertions, 5 deletions
diff --git a/Documentation/ABI/testing/sysfs-driver-w1_therm b/Documentation/ABI/testing/sysfs-driver-w1_therm index b44b51a88c5e..9f05bcdcd762 100644 --- a/Documentation/ABI/testing/sysfs-driver-w1_therm +++ b/Documentation/ABI/testing/sysfs-driver-w1_therm @@ -49,7 +49,7 @@ Description: will be changed only in device RAM, so it will be cleared when power is lost. Trigger a 'save' to EEPROM command to keep values after power-on. Read or write are : - * '9..12': device resolution in bit + * '9..14': device resolution in bit or resolution to set in bit * '-xx': xx is kernel error when reading the resolution * Anything else: do nothing @@ -89,7 +89,7 @@ Description: *write* : * '0' : save the 2 or 3 bytes to the device EEPROM (i.e. TH, TL and config register) - * '9..12' : set the device resolution in RAM + * '9..14' : set the device resolution in RAM (if supported) * Anything else: do nothing refer to Documentation/w1/slaves/w1_therm.rst for detailed diff --git a/Documentation/w1/slaves/w1_therm.rst b/Documentation/w1/slaves/w1_therm.rst index f1148181f53e..00376501a5ef 100644 --- a/Documentation/w1/slaves/w1_therm.rst +++ b/Documentation/w1/slaves/w1_therm.rst @@ -6,6 +6,7 @@ Supported chips: * Maxim ds18*20 based temperature sensors. * Maxim ds1825 based temperature sensors. + * GXCAS GC20MH01 temperature sensor. Author: Evgeniy Polyakov <johnpol@2ka.mipt.ru> @@ -13,8 +14,8 @@ Author: Evgeniy Polyakov <johnpol@2ka.mipt.ru> Description ----------- -w1_therm provides basic temperature conversion for ds18*20 devices, and the -ds28ea00 device. +w1_therm provides basic temperature conversion for ds18*20, ds28ea00, GX20MH01 +devices. Supported family codes: @@ -130,4 +131,12 @@ conversion and temperature reads 85.00 (powerup value) or 127.94 (insufficient power), the driver returns a conversion error. Bit mask ``2`` enables poll for conversion completion (normal power only) by generating read cycles on the bus after conversion starts. In parasite power mode this feature is not available. -Feature bit masks may be combined (OR). +Feature bit masks may be combined (OR). See accompanying sysfs documentation: +:ref:`Documentation/w1/slaves/w1_therm.rst <w1_therm>` + +GX20MH01 device shares family number 0x28 with DS18*20. The device is generally +compatible with DS18B20. Added are lowest 2^-5, 2^-6 temperature bits in Config +register; R2 bit in Config register enabling 13 and 14 bit resolutions. The +device is powered up in 14-bit resolution mode. The conversion times specified +in the datasheet are too low and have to be increased. The device supports +driver features ``1`` and ``2``. |