Hi guys.
I need some help with my device tree overlay. I'm trying to change the pin
mux settings on pins 7 thru 10 on the P8 header to pull down so they can be
used at outputs. I'm putting these in a separate group in my DTO, but it's
not showing up in /sys/kernel/debug/pinctrl/44e10800.pinmux/pingroups, nor
do the settings show up differently in
/sys/kernel/debug/pinctrl/44e10800.pinmux/pins.
The relevant sections of the DTO:
/dts-v1/;
/plugin/;
/ {
compatible = "ti,beaglebone", "ti,beaglebone-black";
/* identification */
part-number = "BB-BONELT-WEICS";
version = "00A0";
/* state the resources this cape uses */
exclusive-use =
/* the pin header uses */
"P8.07",
"P8.08",
"P8.09",
"P8.10",
.
.
.
fragment@0 {
target = <&am33xx_pinmux>;
__overlay__ {
weics_override_pins: pinmux_weics_override_pins {
pinctrl-single,pins = <
0x090 0x27 /* P8_07 */
0x094 0x27 /* P8_08 */
0x09c 0x27 /* P8_09 */
0x098 0x27 /* P8_10 */
>;
};
.
.
.
fragment@3 {
target = <&ocp>;
__overlay__ {
/* avoid stupid warning */
#address-cells = <1>;
#size-cells = <1>;
weics_override_helper: helper {
compatible = "weics-override-helper";
pinctrl-names="default";
pinctrl-0 = <&weics_override_pins>;
status="okay";
};
.
.
.
};
Two things to note:
1: The rest of this DTO does work. I have an LCD panel as part of the DTO
which will adjust its viewable resolution to whatever is set in the panel's
node of the DTO.
2: We are not using the cape manager in order to optimize the BBB's boot
time. I'm working with an Angstrom build someone else compiled, so I'm not
certain (yet) how this DTO is loaded.
My questions are this: Is there anything else that needs to be added to
this DTO to get the new pin mux settings applied correctly for these four
pins?
Am I missing in the SRM documentation somewhere these pins can't be muxed
to something different?
Apologies if something doesn't make sense in my post... I'm still quite a
newbie to device tree overlays.
Thanks!
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