OrangePiZero 3 and w1-gpio for DS18B20

[TRay]

I try to understand problem

 

[ 4.997793] sun50i-h616-pinctrl 300b000.pinctrl: pin PC10 already requested by onewire@0; cannot claim for 300b000.pinctrl:74

 

and I see this message is generate by:

 

https://github.com/torvalds/linux/blob/master/drivers/pinctrl/pinmux.c#L102

 

/**
 * pin_request() - request a single pin to be muxed in, typically for GPIO
 * @pctldev: the associated pin controller device
 * @pin: the pin number in the global pin space
 * @owner: a representation of the owner of this pin; typically the device
 *    name that controls its mux function, or the requested GPIO name
 * @gpio_range: the range matching the GPIO pin if this is a request for a
 *    single GPIO pin
 */

......


	if ((!gpio_range || ops->strict) &&
	    desc->mux_usecount && strcmp(desc->mux_owner, owner)) {
		dev_err(pctldev->dev,
			"pin %s already requested by %s; cannot claim for %s\n",
			desc->name, desc->mux_owner, owner);
		goto out;
	}

	if ((gpio_range || ops->strict) && desc->gpio_owner) {
		dev_err(pctldev->dev,
			"pin %s already requested by %s; cannot claim for %s\n",
			desc->name, desc->gpio_owner, owner);
		goto out;
	}
.....

 

[TRay]

I used simple dts file as possible :

 

/dts-v1/;
/plugin/;
/ {
    model = "OrangePi Zero3";
    compatible = "xunlong,orangepi-zero3", "allwinner,sun50i-h618";
    fragment@0 {
            target-path = "/";
            __overlay__ {
                    w1: onewire@0 {
                            compatible = "w1-gpio";
                            pinctrl-names = "default";
                            gpios = <&pio 2 7 0>;
                            status = "okay";
                    };
            };
    };
};

 

compiled:

 

armbian-add-overlay w1-gpio.dts

 

and works  🙂 with armbianEnv.txt

 

user_overlays=w1-gpio
param_w1_pin=PC10
param_w1_pin_int_pullup=0

 

demsg show

 

[    5.015541] Driver for 1-wire Dallas network protocol.
[    5.019754] gpio-74 (onewire@0): enforced open drain please flag it properly in DT/ACPI DSDT/board file
[    5.046831] w1_master_driver w1_bus_master1: Attaching one wire slave 28.03165129ecff crc 24

 

and

cat /sys//bus/w1/devices/28-03165129ecff/w1_slave

76 01 4b 46 7f ff 0c 10 d3 : crc=d3 YES
76 01 4b 46 7f ff 0c 10 d3 t=23375

 

      SBC                         DS18B20
  
VCC (3V3)    Pin 1 ----------   VCC    DS18B20
                            |
                          R1 = 4k7
                            |
GPIO74       Pin 26 ---------   Data   DS18B20

GND          Pin 6 ----------   GND    DS18B20