Я пытаюсь запустить ядро Linux на плате Rockchip rk3288.
На этой плате работает нативное ядро Android. Я извлек источник дерева устройств (DTS) из Android, чтобы использовать его в качестве ссылки для создания пользовательского DTS для ядра Linux, выполнив следующие действия:
$ mkdir /tmp/dtb
$ adb pull /proc/device-tree/ /tmp/dtb
$ dtc -I fs -O dts /tmp/dtb/ > /tmp/android.dts
Используя android.dts в качестве основы, я пытаюсь написать собственный linux.dts для запуска ядра Linux 4.4.103 на моей плате. Исходники ядра Linux можно скачать из этого репозитория:
git://github.com/rockchip-linux/kernel.git
Используя мое пользовательское linux.dts , загружается ядро Linux, оно прекрасно монтирует корневую файловую систему, появляется консоль входа в систему (последовательная), и даже устройство Ethernet работает как положено.
Но у меня проблемы с питанием с USB-OTG и с mini-pci-e. Используя проверенный мультиметр, разъем USB-OTG получает 0 В при работе моего ядра Linux, но он получает 4,8 В при работе ядра Android. Кроме того, mini-pci-e получает 0 В при работе с ядром Linux, но получает 3,75 В при работе с ядром Android.
Я не знаю, какие линии GPIO должны управляться для включения питания на этих двух устройствах. Мой опыт работы с деревьями устройств довольно ограничен, поэтому любой совет с этим может быть очень полезным. Заранее большое спасибо! :)
Это текущая linux.dts версия:
/dts-v1/;
#include <dt-bindings/clock/rockchip,rk808.h>
#include "rk3288.dtsi"
/ {
model = "Linux RK3288";
compatible = "rockchip,rk3288-merrii-k2", "rockchip,rk3288";
memory {
reg = <0x0 0x0 0x0 0x80000000>;
device_type = "memory";
};
ext_gmac: external-gmac-clock {
compatible = "fixed-clock";
#clock-cells = <0>;
clock-frequency = <125000000>;
clock-output-names = "ext_gmac";
};
sdio_pwrseq: sdio-pwrseq {
compatible = "mmc-pwrseq-simple";
clocks = <&rk808 RK808_CLKOUT1>;
clock-names = "ext_clock";
pinctrl-names = "default";
pinctrl-0 = <&wifi_enable_h>;
reset-gpios = <&gpio4 28 GPIO_ACTIVE_LOW>;
};
vcc_5v: usb-regulator {
compatible = "regulator-fixed";
regulator-name = "vcc_5v";
regulator-min-microvolt = <5000000>;
regulator-max-microvolt = <5000000>;
regulator-always-on;
regulator-boot-on;
vin-supply = <&vcc_sys>;
};
vcc_host_5v: usb-host-regulator {
compatible = "regulator-fixed";
enable-active-high;
gpio = <&gpio0 14 GPIO_ACTIVE_HIGH>;
pinctrl-names = "default";
pinctrl-0 = <&host_vbus_drv>;
regulator-name = "vcc_host_5v";
regulator-min-microvolt = <5000000>;
regulator-max-microvolt = <5000000>;
regulator-always-on;
vin-supply = <&vcc_5v>;
};
vcc_otg_5v: usb-otg-regulator {
compatible = "regulator-fixed";
enable-active-high;
gpio = <&gpio0 12 GPIO_ACTIVE_HIGH>;
pinctrl-names = "default";
pinctrl-0 = <&otg_vbus_drv>;
regulator-name = "vcc_otg_5v";
regulator-min-microvolt = <5000000>;
regulator-max-microvolt = <5000000>;
regulator-always-on;
vin-supply = <&vcc_5v>;
};
vcc_sys: vsys-regulator {
compatible = "regulator-fixed";
regulator-name = "vcc_sys";
regulator-min-microvolt = <5000000>;
regulator-max-microvolt = <5000000>;
regulator-always-on;
regulator-boot-on;
};
usb_control {
compatible = "rockchip,rk3288-usb-control";
host_drv_gpio = <&gpio0 14 GPIO_ACTIVE_LOW>;
otg_drv_gpio = <&gpio0 12 GPIO_ACTIVE_LOW>;
rockchip,remote_wakeup;
rockchip,usb_irq_wakeup;
};
};
&hdmi {
status = "okay";
rockchip,cec_enable = <0>;
rockchip,hdcp_enable = <0>;
rockchip,defaultmode = <16>;
};
&dmc {
status = "okay";
};
&cpu0 {
cpu0-supply = <&vdd_cpu>;
enable-method = "psci";
};
&cpu1 {
enable-method = "psci";
};
&cpu2 {
enable-method = "psci";
};
&cpu3 {
enable-method = "psci";
};
&pwm0 {
status = "okay";
};
&pwm1 {
status = "okay";
};
&emmc {
bus-width = <8>;
cap-mmc-highspeed;
disable-wp;
non-removable;
num-slots = <1>;
pinctrl-names = "default";
pinctrl-0 = <&emmc_clk &emmc_cmd &emmc_pwr &emmc_bus8>;
status = "okay";
};
&sdmmc {
bus-width = <4>;
cap-mmc-highspeed;
cap-sd-highspeed;
card-detect-delay = <200>;
disable-wp;
num-slots = <1>;
pinctrl-names = "default";
pinctrl-0 = <&sdmmc_clk &sdmmc_cmd &sdmmc_cd &sdmmc_bus4>;
status = "okay";
supports-sd;
vmmc-supply = <&vcc_sd>;
vqmmc-supply = <&vccio_sd>;
};
&sdio0 {
status = "okay";
clock-frequency = <50000000>;
clock-freq-min-max = <200000 50000000>;
bus-width = <4>;
cap-sd-highspeed;
cap-sdio-irq;
disable-wp;
keep-power-in-suspend;
mmc-pwrseq = <&sdio_pwrseq>;
non-removable;
num-slots = <1>;
pinctrl-names = "default";
pinctrl-0 = <&sdio0_bus4 &sdio0_cmd &sdio0_clk>;
supports-sdio;
};
&gmac {
assigned-clocks = <&cru SCLK_MAC>;
assigned-clock-parents = <&ext_gmac>;
clock_in_out = "input";
pinctrl-names = "default";
pinctrl-0 = <&rmii_pins>;
phy-supply = <&vcc_lan>;
phy-mode = "rmii";
rx_delay = <0x20>;
tx_delay = <0x30>;
status = "okay";
snps,reset-gpio = <&gpio4 7 0>;
};
&gpu {
mali-supply = <&vdd_gpu>;
status = "okay";
};
&hevc_service {
status = "okay";
};
&i2c0 {
status = "okay";
clock-frequency = <400000>;
rk808: pmic@1b {
compatible = "rockchip,rk808";
reg = <0x1b>;
status = "okay";
interrupt-parent = <&gpio0>;
interrupts = <4 IRQ_TYPE_LEVEL_LOW>;
#clock-cells = <1>;
clock-output-names = "rk808-clkout1", "rk808-clkout2";
pinctrl-names = "default";
pinctrl-0 = <&pmic_int &global_pwroff>;
rockchip,system-power-controller;
wakeup-source;
vcc1-supply = <&vcc_sys>;
vcc2-supply = <&vcc_sys>;
vcc3-supply = <&vcc_sys>;
vcc4-supply = <&vcc_sys>;
vcc6-supply = <&vcc_sys>;
vcc7-supply = <&vcc_sys>;
vcc8-supply = <&vcc_io>;
vcc9-supply = <&vcc_io>;
vcc10-supply = <&vcc_io>;
vcc11-supply = <&vcc_io>;
vcc12-supply = <&vcc_io>;
vddio-supply = <&vcc_io>;
regulators {
vdd_cpu: DCDC_REG1 {
regulator-always-on;
regulator-boot-on;
regulator-min-microvolt = <900000>;
regulator-max-microvolt = <1500000>;
regulator-name = "vdd_arm";
regulator-state-mem {
regulator-off-in-suspend;
};
};
vdd_gpu: DCDC_REG2 {
regulator-always-on;
regulator-boot-on;
regulator-min-microvolt = <900000>;
regulator-max-microvolt = <1500000>;
regulator-name = "vdd_gpu";
regulator-ramp-delay = <6000>;
regulator-state-mem {
regulator-on-in-suspend;
regulator-suspend-microvolt = <1100000>;
};
};
vcc_ddr: DCDC_REG3 {
regulator-always-on;
regulator-boot-on;
regulator-name = "vcc_ddr";
regulator-state-mem {
regulator-on-in-suspend;
};
};
vcc_io: DCDC_REG4 {
regulator-always-on;
regulator-boot-on;
regulator-min-microvolt = <3300000>;
regulator-max-microvolt = <3300000>;
regulator-name = "vcc_io";
regulator-state-mem {
regulator-on-in-suspend;
regulator-suspend-microvolt = <3300000>;
};
};
vccio_pmu: LDO_REG1 {
regulator-always-on;
regulator-boot-on;
regulator-min-microvolt = <3300000>;
regulator-max-microvolt = <3300000>;
regulator-name = "vccio_pmu";
regulator-state-mem {
regulator-on-in-suspend;
regulator-suspend-microvolt = <3300000>;
};
};
vcca_33: LDO_REG2 {
regulator-always-on;
regulator-boot-on;
regulator-min-microvolt = <3300000>;
regulator-max-microvolt = <3300000>;
regulator-name = "vcca_33";
regulator-state-mem {
regulator-off-in-suspend;
};
};
vdd_10: LDO_REG3 {
regulator-always-on;
regulator-boot-on;
regulator-min-microvolt = <1000000>;
regulator-max-microvolt = <1000000>;
regulator-name = "vdd_10";
regulator-state-mem {
regulator-on-in-suspend;
regulator-suspend-microvolt = <1000000>;
};
};
vcc_wl: LDO_REG4 {
regulator-always-on;
regulator-boot-on;
regulator-min-microvolt = <1800000>;
regulator-max-microvolt = <1800000>;
regulator-name = "vcc_wl";
regulator-state-mem {
regulator-on-in-suspend;
regulator-suspend-microvolt = <1800000>;
};
};
vccio_sd: LDO_REG5 {
regulator-always-on;
regulator-boot-on;
regulator-min-microvolt = <1800000>;
regulator-max-microvolt = <3300000>;
regulator-name = "vccio_sd";
regulator-state-mem {
regulator-on-in-suspend;
regulator-suspend-microvolt = <3300000>;
};
};
vdd10_lcd: LDO_REG6 {
regulator-always-on;
regulator-boot-on;
regulator-min-microvolt = <1000000>;
regulator-max-microvolt = <1000000>;
regulator-name = "vdd10_lcd";
regulator-state-mem {
regulator-on-in-suspend;
regulator-suspend-microvolt = <1000000>;
};
};
vcc_18: LDO_REG7 {
regulator-always-on;
regulator-boot-on;
regulator-min-microvolt = <1800000>;
regulator-max-microvolt = <1800000>;
regulator-name = "vcc_18";
regulator-state-mem {
regulator-on-in-suspend;
regulator-suspend-microvolt = <1800000>;
};
};
vcc18_lcd: LDO_REG8 {
regulator-always-on;
regulator-boot-on;
regulator-min-microvolt = <1800000>;
regulator-max-microvolt = <1800000>;
regulator-name = "vcc18_lcd";
regulator-state-mem {
regulator-on-in-suspend;
regulator-suspend-microvolt = <1800000>;
};
};
vcc_sd: SWITCH_REG1 {
regulator-always-on;
regulator-boot-on;
regulator-name = "vcc_sd";
regulator-state-mem {
regulator-on-in-suspend;
};
};
vcc_lan: SWITCH_REG2 {
regulator-always-on;
regulator-boot-on;
regulator-name = "vcc_lan";
regulator-state-mem {
regulator-on-in-suspend;
};
};
};
};
};
&i2c1 {
status = "okay";
};
&i2c2 {
status = "okay";
};
&i2c3 {
status = "okay";
};
&i2c4 {
status = "okay";
};
&i2c5 {
status = "disabled";
};
&i2s {
#sound-dai-cells = <0>;
status = "okay";
};
&io_domains {
status = "okay";
};
&uart0 {
status = "okay";
};
&uart1 {
status = "okay";
};
&uart2 {
status = "okay";
};
&uart3 {
status = "okay";
};
&uart4 {
status = "okay";
};
&usbphy {
status = "okay";
};
&usb_host0_ehci {
status = "okay";
compatible = "rockchip,rk3288_rk_ehci_host";
};
&usb_host0_ohci {
status = "okay";
};
&usb_host1 {
status = "okay";
};
&usb_otg {
status = "okay";
};
&vopb {
status = "okay";
};
&vopb_mmu {
status = "okay";
};
&vopl {
status = "okay";
};
&vopl_mmu {
status = "okay";
};
&vpu_service {
status = "okay";
};
&wdt {
status = "okay";
};
&pinctrl {
pcfg_output_high: pcfg-output-high {
output-high;
};
pcfg_output_low: pcfg-output-low {
output-low;
};
pmic {
pmic_int: pmic-int {
rockchip,pins = <RK_GPIO0 4 RK_FUNC_GPIO &pcfg_pull_up>;
};
};
sdio-pwrseq {
wifi_enable_h: wifi-enable-h {
rockchip,pins = <RK_GPIO4 28 RK_FUNC_GPIO &pcfg_pull_none>;
};
};
usb_host {
host_vbus_drv: host-vbus-drv {
rockchip,pins = <RK_GPIO0 14 RK_FUNC_GPIO &pcfg_pull_none>;
};
};
usb_otg {
otg_vbus_drv: otg-vbus-drv {
rockchip,pins = <RK_GPIO0 12 RK_FUNC_GPIO &pcfg_pull_none>;
};
};
};