5. VIVO-Y927 Linux 内核设备树完善（GPIO按键）
|字数总计:1.5k|阅读时长:8分钟|阅读量:|
第4阶段：完善 GPIO 按键
目标
支持音量键/电源键
DTS 改动分析
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| #include <dt-bindings/input/input.h>
/ {
gpio-keys {
compatible = "gpio-keys";
pinctrl-names = "default";
pinctrl-0 = <&gpio_keys_default>;
label = "GPIO Buttons";
button-volume-up {
label = "Volume Up";
gpios = <&tlmm 107 GPIO_ACTIVE_LOW>;
linux,code = <KEY_VOLUMEUP>;
};
};
};
&pm8916_resin {
linux,code = <KEY_VOLUMEDOWN>;
status = "okay";
};
&tlmm {
gpio_keys_default: gpio-keys-default-state {
pins = "gpio107";
function = "gpio";
drive-strength = <2>;
bias-pull-up;
};
};
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最后的 DTS 如下：
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|
/dts-v1/;
#include "msm8916-pm8916.dtsi"
#include <dt-bindings/gpio/gpio.h>
#include <dt-bindings/input/input.h>
/ {
model = "vivo Y927 (PD1410V)";
compatible = "vivo,y927", "qcom,msm8916";
chassis-type = "handset";
aliases {
mmc0 = &sdhc_1;
mmc1 = &sdhc_2;
};
usb_id: usb-id {
compatible = "linux,extcon-usb-gpio";
id-gpios = <&tlmm 110 GPIO_ACTIVE_HIGH>;
pinctrl-names = "default";
pinctrl-0 = <&usb_id_default>;
};
backlight: backlight {
compatible = "gpio-backlight";
gpios = <&tlmm 8 GPIO_ACTIVE_HIGH>;
default-on;
};
reg_lcd_enp: regulator-lcd-enp {
compatible = "regulator-fixed";
regulator-name = "lcd_enp";
gpio = <&tlmm 97 GPIO_ACTIVE_HIGH>;
enable-active-high;
regulator-always-on;
regulator-boot-on;
};
reg_lcd_enn: regulator-lcd-enn {
compatible = "regulator-fixed";
regulator-name = "lcd_enn";
gpio = <&tlmm 98 GPIO_ACTIVE_HIGH>;
enable-active-high;
regulator-always-on;
regulator-boot-on;
};
reserved-memory {
cont-splash@83200000 {
reg = <0 0x83200000 0 0x800000>;
no-map;
};
};
gpio-keys {
compatible = "gpio-keys";
pinctrl-names = "default";
pinctrl-0 = <&gpio_keys_default>;
label = "GPIO Buttons";
button-volume-up {
label = "Volume Up";
gpios = <&tlmm 107 GPIO_ACTIVE_LOW>;
linux,code = <KEY_VOLUMEUP>;
};
};
};
&usb {
dr_mode = "peripheral";
extcon = <&usb_id>, <&usb_id>;
status = "okay";
};
&usb_hs_phy {
extcon = <&usb_id>;
status = "okay";
};
&tlmm {
usb_id_default: usb-id-default {
pins = "gpio110";
function = "gpio";
drive-strength = <8>;
bias-pull-up;
};
mdss_default: mdss-default-state {
pins = "gpio25";
function = "gpio";
drive-strength = <8>;
bias-disable;
};
mdss_sleep: mdss-sleep-state {
pins = "gpio25";
function = "gpio";
drive-strength = <2>;
bias-pull-down;
};
gpio_keys_default: gpio-keys-default-state {
pins = "gpio107";
function = "gpio";
drive-strength = <2>;
bias-pull-up;
};
};
&pm8916_resin {
linux,code = <KEY_VOLUMEDOWN>;
status = "okay";
};
&sdhc_1 {
status = "okay";
};
&sdhc_2 {
status = "okay";
cd-gpios = <&tlmm 38 GPIO_ACTIVE_LOW>;
};
&mdss {
status = "okay";
};
&mdss_dsi0 {
pinctrl-names = "default", "sleep";
pinctrl-0 = <&mdss_default>;
pinctrl-1 = <&mdss_sleep>;
status = "okay";
panel@0 {
compatible = "vivo,y927-hx8394a";
reg = <0>;
reset-gpios = <&tlmm 25 GPIO_ACTIVE_LOW>;
backlight = <&backlight>;
vsp-supply = <®_lcd_enp>;
vsn-supply = <®_lcd_enn>;
port {
panel_in: endpoint {
remote-endpoint = <&mdss_dsi0_out>;
};
};
};
};
&mdss_dsi0_out {
data-lanes = <0 1 2 3>;
remote-endpoint = <&panel_in>;
};
|
编译 Linux 内核
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| cd ~/y927/linux
make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- -j$(nproc) Image.gz dtbs
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构建 boot.img 文件
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| cd ~/y927/linux
cat arch/arm64/boot/Image.gz \
arch/arm64/boot/dts/qcom/msm8916-vivo-y927.dtb \
> vmlinuz-dtb
~/y927/lk2nd/lk2nd/scripts/mkbootimg \
--kernel vmlinuz-dtb \
--ramdisk $HOME/y927/initramfs/initramfs-phase-3.cpio.gz \
--cmdline "console=tty0 console=ttyMSM0,115200 panic=1 initcall_blacklist=simpledrm_platform_driver_init" \
--base 0x80000000 \
--kernel_offset 0x00008000 \
--ramdisk_offset 0x01000000 \
--second_offset 0x00f00000 \
--tags_offset 0x00000100 \
--pagesize 2048 \
--header_version 0 \
--output boot-phase4.img
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刷入 boot.img 文件
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| fastboot flash boot boot-phase4.img
fastboot reboot
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测试
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| sudo picocom -b 115200 /dev/ttyACM0
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2026-06-14 12:32 所有物理按键被成功识别
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| ~
I: Bus=0000 Vendor=0000 Product=0000 Version=0000
N: Name="pm8941_pwrkey"
P: Phys=pm8941_pwrkey/input0
S: Sysfs=/devices/platform/soc@0/200f000.spmi/spmi-0/0-00/200f000.spmi:pmic@0:pon@800/200f000.spmi:pmic@0:pon@800:pwrkey/input/input0
U: Uniq=
H: Handlers=kbd event0
B: PROP=0
B: EV=3
B: KEY=10000000000000 0
I: Bus=0000 Vendor=0000 Product=0000 Version=0000
N: Name="pm8941_resin"
P: Phys=pm8941_resin/input0
S: Sysfs=/devices/platform/soc@0/200f000.spmi/spmi-0/0-00/200f000.spmi:pmic@0:pon@800/200f000.spmi:pmic@0:pon@800:resin/input/input1
U: Uniq=
H: Handlers=kbd event1
B: PROP=0
B: EV=3
B: KEY=4000000000000 0
I: Bus=0019 Vendor=0001 Product=0001 Version=0100
N: Name="GPIO Buttons"
P: Phys=gpio-keys/input0
S: Sysfs=/devices/platform/gpio-keys/input/input2
U: Uniq=
H: Handlers=kbd event2
B: PROP=0
B: EV=3
B: KEY=8000000000000 0
|
第4.1阶段：编译evtest打包进initramfs测试
目标
编译一个arm64版本的evtest，并打包到initramfs里用于测试物理按键是否正常工作。
工具准备
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| sudo apt install -y autoconf automake libtool pkg-config gcc-aarch64-linux-gnu
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克隆源码
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| mkdir -p ~/y927/evtest && cd ~/y927/evtest
git clone https://gitlab.freedesktop.org/libevdev/evtest.git src
cd src
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交叉编译
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| cd ~/y927/evtest/src
./autogen.sh --host=aarch64-linux-gnu \
CC=aarch64-linux-gnu-gcc \
CFLAGS='-Os -static' \
LDFLAGS='-static'
make -j$(nproc)
file evtest
aarch64-linux-gnu-strip evtest
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制作initramfs
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| BUSYBOX_BINARY=~/y927/busybox-1.38.0/busybox
EVTEST_BINARY=~/y927/evtest/src/evtest
cd ~/y927/initramfs
rm -rf phase-4
mkdir -p phase-4 && cd phase-4
mkdir -p bin dev proc sys lib/modules
cp $BUSYBOX_BINARY bin/
cp $EVTEST_BINARY bin/
cd bin
for cmd in sh mount ls cat sleep exec echo; do
ln -sf busybox $cmd
done
cd ..
cat > init << 'EOF'
mount -t proc proc /proc
mount -t sysfs sys /sys
mount -t devtmpfs dev /dev
echo "===== Phase 1: kernel booted! ====="
echo "Serial: $(cat /proc/cmdline)"
sleep 5
exec sh </dev/ttyGS0 >/dev/ttyGS0 2>&1
EOF
chmod +x init
find . | cpio -o -H newc | gzip > ../initramfs-phase-4.cpio.gz
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构建 boot.img 文件
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| cd ~/y927/linux
cat arch/arm64/boot/Image.gz \
arch/arm64/boot/dts/qcom/msm8916-vivo-y927.dtb \
> vmlinuz-dtb
~/y927/lk2nd/lk2nd/scripts/mkbootimg \
--kernel vmlinuz-dtb \
--ramdisk $HOME/y927/initramfs/initramfs-phase-4.cpio.gz \
--cmdline "console=tty0 console=ttyMSM0,115200 panic=1 initcall_blacklist=simpledrm_platform_driver_init" \
--base 0x80000000 \
--kernel_offset 0x00008000 \
--ramdisk_offset 0x01000000 \
--second_offset 0x00f00000 \
--tags_offset 0x00000100 \
--pagesize 2048 \
--header_version 0 \
--output boot-phase4.img
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刷入 boot.img 文件
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| fastboot flash boot boot-phase4.img
fastboot reboot
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测试
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| sudo picocom -b 115200 /dev/ttyACM0
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| evtest /dev/input/event0
evtest /dev/input/event1
evtest /dev/input/event2
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然后按对应的按键，就可以滚动输出对应的按键状态了
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