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Has anyone got DS18b20 to work on rock64? If you can point in the right direction, I would appreciate that very much. I've been searching and cant find anything other the a post for pine64 that said that I need to use pin 12.
(12-23-2018, 12:32 PM)mypineme Wrote: [ -> ]Has anyone got DS18b20 to work on rock64?

Yes. Step by step:
  1. Hardware setup: I suppose pin12 is unusable (works only as input). Let's make following pin connection setup - rock64 pin1 (3.3V) = DS18B20 pin3 (VDD), rock64 pin7 (GPIO1_D4) = DS18B20 pin2 (DQ), rock64 pin9 (GND) = DS18B20 pin1 (GND) and pullup resistor 4k7 ohm between DS18B20 pin3 and DS18B20 pin2.
  2. Prepare DTOVERLAY for "w1_gpio" driver association. Let's assume GPIO1_D4 == id 60, GPIO1_D4 == GPIO1 + bit 28.
    Code:
    $ cat > w1_pin60.dts << 'EOF'
    /dts-v1/;
    /plugin/;

    / {
        compatible = "pine64,rock64", "rockchip,rk3328";
        [email protected] {
            target-path = "/";
            __overlay__ {
                w1: [email protected] {
                    compatible = "w1-gpio";
                    pinctrl-names = "default";
                    pinctrl-0 = <&w1_pins>;
                    gpios = <&gpio1 28 0>;
                    status = "okay";
                };
            };
        };
        [email protected] {
            target = <&gpio1>;
            __overlay__ {
                w1_pins: [email protected] {
                    rockchip,pins = <1 28 0 &pcfg_pull_up>;
                };
            };
        };
    };
    EOF
    $ dtc -I dts -O dtb [email protected] w1_pin60.dts -o w1_pin60.dtbo
    $ ### ignore warnings
  3. Successful load of DTOVERLAY depends on your device tree (DTB symbols must be included). Check DTB symbols if exists skip to step 5.
    Code:
    $ dtc /boot/dtbs/$(uname -r)/rockchip/rk3328-rock64.dtb -o - 2>/dev/null | grep __symbols__
        __symbols__ {
    $ ### ^^^^ symbols included or not included if no output
  4. Symbols are NOT present in latest stable 0.7.9 based on kernel 4.4.132-1075 Sad
    So you must rebuild rk3328-rock64.dtb with symbols.
    Code:
    $ uname -a
    Linux rock64 4.4.132-1075-rockchip-ayufan-ga83beded8524 #1 SMP Thu Jul 26 08:22:22 UTC 2018 aarch64 aarch64 aarch64 GNU/Linux
    $ sudo bash
    # wget https://github.com/ayufan-rock64/linux-kernel/archive/4.4.132-1075-rockchip-ayufan.tar.gz
    # tar xzf 4.4.132-1075-rockchip-ayufan.tar.gz
    # cd linux-kernel-4.4.132-1075-rockchip-ayufan/
    # export ARCH=arm64
    # make rockchip_linux_defconfig
    # make DTC_FLAGS="[email protected]" dtbs
    # mv /boot/dtbs/4.4.132-1075-rockchip-ayufan-ga83beded8524/rockchip/rk3328-rock64.dtb /boot/dtbs/4.4.132-1075-rockchip-ayufan-ga83beded8524/rockchip/rk3328-rock64.dtb_orig
    # cp arch/arm64/boot/dts/rockchip/rk3328-rock64.dtb /boot/dtbs/4.4.132-1075-rockchip-ayufan-ga83beded8524/rockchip/rk3328-rock64.dtb
    # reboot
    # ### after reboot check presented symbols
  5. Load DTOVERLAY:
    Code:
    $ sudo bash
    # ### speedup minimum CPU frequency due to polling behavior of w1-gpio
    # echo 600000 > /sys/devices/system/cpu/cpufreq/policy0/scaling_min_freq

    # ### load DTOVERLAY
    # mkdir -p /sys/kernel/config/device-tree/overlays/w1
    # cat w1_pin60.dtbo > /sys/kernel/config/device-tree/overlays/w1/dtbo
    # lsmod | grep w1
    w1_gpio                16384  0
    wire                   32768  1 w1_gpio

    # find /sys/bus/w1/
    /sys/bus/w1/
    /sys/bus/w1/devices
    /sys/bus/w1/devices/w1_bus_master1
    /sys/bus/w1/drivers
    /sys/bus/w1/drivers/w1_master_driver
    /sys/bus/w1/drivers/w1_master_driver/bind
    /sys/bus/w1/drivers/w1_master_driver/w1_bus_master1
    /sys/bus/w1/drivers/w1_master_driver/uevent
    /sys/bus/w1/drivers/w1_master_driver/unbind
    /sys/bus/w1/drivers/w1_slave_driver
    /sys/bus/w1/drivers/w1_slave_driver/bind
    /sys/bus/w1/drivers/w1_slave_driver/uevent
    /sys/bus/w1/drivers/w1_slave_driver/unbind
    /sys/bus/w1/uevent
    /sys/bus/w1/drivers_probe
    /sys/bus/w1/drivers_autoprobe

    # ### autoprobe should discover sensor after few seconds
    # find /sys/bus/w1/
    /sys/bus/w1/
    /sys/bus/w1/devices
    /sys/bus/w1/devices/w1_bus_master1
    /sys/bus/w1/devices/28-000000423711
    /sys/bus/w1/drivers
    /sys/bus/w1/drivers/w1_master_driver
    /sys/bus/w1/drivers/w1_master_driver/bind
    /sys/bus/w1/drivers/w1_master_driver/w1_bus_master1
    /sys/bus/w1/drivers/w1_master_driver/uevent
    /sys/bus/w1/drivers/w1_master_driver/unbind
    /sys/bus/w1/drivers/w1_slave_driver
    /sys/bus/w1/drivers/w1_slave_driver/bind
    /sys/bus/w1/drivers/w1_slave_driver/28-000000423711
    /sys/bus/w1/drivers/w1_slave_driver/uevent
    /sys/bus/w1/drivers/w1_slave_driver/unbind
    /sys/bus/w1/uevent
    /sys/bus/w1/drivers_probe
    /sys/bus/w1/drivers_autoprobe

    # ### check w1
    # grep '' /sys/bus/w1/devices/w1_bus_master1/w1_master_slave_count /sys/bus/w1/devices/w1_bus_master1/w1_master_slaves
    /sys/bus/w1/devices/w1_bus_master1/w1_master_slave_count:1
    /sys/bus/w1/devices/w1_bus_master1/w1_master_slaves:28-000000423711

    # ### thermal driver automatically loaded
    # lsmod | grep w1
    w1_therm               16384  0
    w1_gpio                16384  0
    wire                   32768  2 w1_gpio,w1_therm

    # ### read temperature
    # cat /sys/bus/w1/devices/*/w1_slave
    6b 01 4b 46 7f ff 05 10 49 : crc=49 YES
    6b 01 4b 46 7f ff 05 10 49 t=22687

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