【RK3399】WDT相关分析

dts

arch/arm64/boot/dts/rockchip/rk3399.dtsi
watchdog@ff848000 {
compatible = “snps,dw-wdt”;
reg = <0x0 0xff848000 0x0 0x100>;#watchdog寄存器基址和大小
clocks = <&cru PCLK_WDT>;#watchdog时钟
interrupts = <GIC_SPI 120 IRQ_TYPE_LEVEL_HIGH 0>;
};
RK3399 watchdog用的是新思（Synopsys）的IP

kernel配置

CONFIG_WATCHDOG=y
CONFIG_WATCHDOG_CORE=y
CONFIG_DW_WATCHDOG=y

wdt 驱动

drivers/watchdog/dw_wdt.c

static const struct of_device_id dw_wdt_of_match[] = {
{ .compatible = “snps,dw-wdt”, },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, dw_wdt_of_match);

static struct platform_driver dw_wdt_driver = {
.probe = dw_wdt_drv_probe,
.remove = dw_wdt_drv_remove,
.driver = {
.name = “dw_wdt”,
.of_match_table = of_match_ptr(dw_wdt_of_match),
.pm = &dw_wdt_pm_ops,
},
};

module_platform_driver(dw_wdt_driver);