Hi all,
I want to enable the pull-up resistors for some gpio pins on a BananaPi-R1
when the pins are accessed from user space through /sys/class/gpio/.
Therefore I have added the following to the pio node of the device tree:
&pio {
...
switch3: switch3@0 {
allwinner,pins = "PI20";
allwinner,function = "gpio_in";
allwinner,drive = <SUN4I_PINCTRL_10_MA>;
allwinner,pull = <SUN4I_PINCTRL_PULL_UP>;
gpio = <&pio 8 20 GPIO_ACTIVE_HIGH>;
};
...
};
I could see the corresponding entry in
/proc/device-tree/soc@01c00000/pinctrl@01c20800 but the pin (located on the
GPIO-J12 jumper) does not show a high state. I would have expected to
measure +3.3V at this pin, but I get only some milivolts. So it seems, that
enabling the pull up seems not working this way. The log when enabling the
pin:
[ 99.024155] sun7i-a20-pinctrl 1c20800.pinctrl: request pin 276 (PI20)
for 1c20800.pinctrl:276
I use currently kernel 4.7.0. Do I miss something?
Regards,
Uli
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