Hi everybody, I'm trying to add ntc thermistor as hwmon in linux. Firts I tried to add hwmon manually, but I simple dont know how. Now I'm trying to create device tree overlay, but I have no luck.
I compiled ntc_thermistor module out-of-tree and loaded to kernel. I think this is ok. # modinfo ntc_thermistor.ko filename: /root/ntc_thermistor/ntc_thermistor.ko alias: platform:ntc-thermistor license: GPL author: MyungJoo Ham <[email protected]> description: NTC Thermistor Driver srcversion: DBAD01E8C409F3A3514FAD2 depends: vermagic: 3.8.13-35-ARCH SMP mod_unload modversions ARMv7 p2v8 # lsmod Module Size Used by ntc_thermistor 4075 0 omap_rng 4599 0 autofs4 21976 2 My .dts file looks like this /dts-v1/; /plugin/; / { compatible = "ti,beaglebone", "ti,beaglebone-black"; /* identification */ part-number = "BB-NTC"; version = "00A0"; /* state the resources this cape uses */ exclusive-use = /* the pin header uses */ "P9.39", /* AIN0 */ "P9.40", /* AIN1 */ "P9.37", /* AIN2 */ "P9.38", /* AIN3 */ "P9.33", /* AIN4 */ "P9.36", /* AIN5 */ "P9.35", /* AIN6 */ /* the hardware IP uses */ "tscadc"; fragment@0 { target = <&ocp>; __overlay__ { /* avoid stupid warning */ #address-cells = <1>; #size-cells = <1>; tscadc { compatible = "ti,ti-tscadc"; reg = <0x44e0d000 0x1000>; interrupt-parent = <&intc>; interrupts = <16>; ti,hwmods = "adc_tsc"; status = "okay"; adc { ti,adc-channels = <0 1 2 3 4 5 6 7>; }; }; ntc@0 { compatible = "ntc,ncp15wb473"; pullup-uv = <1800000>; pullup-ohm = <0>; pulldown-ohm = <12000>; io-channels = <&tscadc 0>; }; test_helper: helper { compatible = "bone-iio-helper"; vsense-name = "AIN0", "AIN1", "AIN2", "AIN3", "AIN4", "AIN5", "AIN6", "AIN7"; vsense-scale = <100 100 100 100 100 100 100 100>; status = "okay"; }; }; }; }; After I add .dtbo to capemgr it looks like everything is ok. #dmesg [ 102.513840] bone-capemgr bone_capemgr.9: part_number 'BB-NTC', version 'N/A' [ 102.514030] bone-capemgr bone_capemgr.9: slot #10: generic override [ 102.514081] bone-capemgr bone_capemgr.9: bone: Using override eeprom data at slot 10 [ 102.514134] bone-capemgr bone_capemgr.9: slot #10: 'Override Board Name,00A0,Override Manuf,BB-NTC' [ 102.514409] bone-capemgr bone_capemgr.9: slot #10: Requesting part number/version based 'BB-NTC-00A0.dtbo [ 102.514463] bone-capemgr bone_capemgr.9: slot #10: Requesting firmware 'BB-NTC-00A0.dtbo' for board-name 'Override Board Name', version '00A0' [ 102.521859] bone-capemgr bone_capemgr.9: slot #10: dtbo 'BB-NTC-00A0.dtbo' loaded; converting to live tree [ 102.525143] bone-capemgr bone_capemgr.9: slot #10: #1 overlays [ 102.551219] bone-iio-helper helper.16: ready [ 102.551443] bone-capemgr bone_capemgr.9: slot #10: Applied #1 overlays. I'm expecting to see hwmon1 in /sys/class/hwmon/, but there is still only hwmon0 from am33xx internal temp sensor. I would really appreciate any help. PS: I still not added compensation table for my NTC to module, but this is test only. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
