我最近开始在 BeagleBone Black 上工作,并且在应用设备树覆盖来修改 pinmux 以使用一些 gpios 时遇到了一些问题。我发现了很多关于设备树覆盖的教程,但我很难应用配置。我需要一些帮助。
这是我正在使用的 dts 文件:(BBB-CAM-00A0.dts)
/dts-v1/;
/plugin/;
/ {
compatible = "ti,beaglebone", "ti,beaglebone-black";
/* identification */
part-number = "BB-CAM";
version = "00A0";
exclusive-use =
/* the pin header uses */
"P8.07",
"P8.08",
"P8.09",
"P8.10",
"P8.11",
"P8.12",
"P8.13",
"P8.14",
"P8.15",
"P8.16",
"P8.17",
"P8.18",
"P8.19",
"P9.11",
"P9.12",
"P9.13",
"P9.14";
fragment@0 {
target = <&am33xx_pinmux>;
__overlay__ {
pinctrl_test: pinctrl_test_0_pins {
pinctrl-single,pins = <
0x090 0x07
0x094 0x07
0x09c 0x07
0x098 0x07
0x034 0x07
0x030 0x07
0x024 0x07
0x028 0x07
0x03c 0x07
0x038 0x07
0x02c 0x07
0x08c 0x07
0x020 0x07
0x070 0x07
0x078 0x07
0x074 0x07
0x048 0x07
>;
};
};
};
fragment@1 {
target = <&ocp>;
__overlay__ {
test_helper: helper {
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_test>;
};
};
};
};
我正在使用的所有引脚都没有从另一个覆盖中使用,所有引脚都是:
pin xx (44e10xxx): (MUX UNCLAIMED) (GPIO UNCLAIMED)
我使用以下方法编译 dts:
dtc -O dtb -o BBB-CAM-00A0.dtbo -b O -@ BBB-CAM-00A0.dts
然后 :
cp BBB-CAM-00A0.dtbo /lib/firmware/
然后:
echo BBB-CAM > /sys/devices/bone_capemgr.*/slots
此时覆盖似乎被接受:
0: 54:PF---
1: 55:PF---
2: 56:PF---
3: 57:PF---
4: ff:P-O-L Bone-LT-eMMC-2G,00A0,Texas Instrument,BB-BONE-EMMC-2G
5: ff:P-O-L Bone-Black-HDMI,00A0,Texas Instrument,BB-BONELT-HDMI
7: ff:P-O-L Override Board Name,00A0,Override Manuf,BBB-CAM
但是pinmux似乎没有改变:
root@beaglebone:~/Desktop# cat $PINS |grep 890
pin 36 (44e10890) 00000037 pinctrl-single
root@beaglebone:~/Desktop# cat $PINS |grep 894
pin 37 (44e10894) 00000037 pinctrl-single
root@beaglebone:~/Desktop# cat $PINS |grep 89c
pin 39 (44e1089c) 00000037 pinctrl-single
root@beaglebone:~/Desktop# cat $PINS |grep 898
pin 38 (44e10898) 00000037 pinctrl-single
root@beaglebone:~/Desktop# cat $PINS |grep 834
pin 13 (44e10834) 00000027 pinctrl-single
root@beaglebone:~/Desktop# cat $PINS |grep 830
pin 12 (44e10830) 00000027 pinctrl-single
root@beaglebone:~/Desktop# cat $PINS |grep 824
pin 9 (44e10824) 00000027 pinctrl-single
root@beaglebone:~/Desktop# cat $PINS |grep 828
pin 10 (44e10828) 00000027 pinctrl-single
root@beaglebone:~/Desktop# cat $PINS |grep 83c
pin 15 (44e1083c) 00000027 pinctrl-single
dmesg
不返回相关信息。
有关信息,这是我未更改的内核:
Linux beaglebone 3.8.13 #1 SMP Wed Sep 4 09:09:32 CEST 2013 armv7l GNU/Linux
我真的不知道如何处理这个问题,有什么建议吗?
非常感谢