Add temperature sensor support to device tree

[hansemro]

Reference:

• Documentation/devicetree/bindings/hwmon/lm75.yaml
• https://www.rot13.org/~dpavlin/presentations/dc2018-linux_sensor_device-tree_shell_IoT.pdf
• https://github.com/hansemro/kernel_omap_otter-common/blob/84763bbf0a9138cb0ba7b42411cd8d0405c1c684/arch/arm/mach-omap2/board-4430kc1-tablet.c#L610

National Semiconductor/TI LM75 ~ TI TMP105

arch/arm/boot/dts/omap4-kc1.dts:

&i2c4 {
    ...
    tmp@49 {
        compatible = "ti,tmp105";
        reg = <0x49>;
        status = "okay";
    };
    ...
};

[hansemro]

Kernel log:

[    3.680664] lm75 3-0049: supply vs not found, using dummy regulator
[    3.721069] lm75: probe of 3-0049 failed with error -121

[hansemro]

Device tree fix: Use register 0x48 instead of 0x49

&i2c4 {
    ...
    tmp@48 {
        compatible = "ti,tmp105";
        reg = <0x48>;
        status = "okay";
    };
    ...
};

Kernel log:

[    3.669189] lm75 3-0048: supply vs not found, using dummy regulator
[    3.700195] lm75 3-0048: hwmon2: sensor 'tmp105'

sysfs:

amazon-otter:~# ls /sys/class/hwmon/hwmon2
device  of_node  subsystem    temp1_max       uevent
name    power    temp1_input  temp1_max_hyst  update_interval
amazon-otter:~# cat /sys/class/hwmon/hwmon2/name 
tmp105
amazon-otter:~# cat /sys/class/hwmon/hwmon2/temp1_max
72000
amazon-otter:~# cat /sys/class/hwmon/hwmon2/temp1_max_hyst 
70000
amazon-otter:~# cat /sys/class/hwmon/hwmon2/temp1_input 
30562

[hansemro]

Added to dtb_dev (commit 6383856e7fc67974ec5624cbae6d4233445c8caa)

[hansemro]

Merged to main (relevant pull request: #14)