I am able to have a 32Khz signal output from PI12 if I add a pullup
definition to
clk_out_a_pins_a: clk_out_a@0 {
allwinner,pins = "PI12";
allwinner,function = "clk_out_a";
allwinner,drive = <SUN4I_PINCTRL_10_MA>;
/* allwinner,pull = <SUN4I_PINCTRL_NO_PULL>; */
allwinner,pull = <SUN4I_PINCTRL_PULL_UP>;
in the file sun71-a20-dtsi
Clearly the rising front is a capacitor charge slope, but it is at 32Khz,
the falling front is correct
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