xref: /freebsd/sys/contrib/device-tree/Bindings/watchdog/st_lpc_wdt.txt (revision c66ec88fed842fbaad62c30d510644ceb7bd2d71)

STMicroelectronics Low Power Controller (LPC) - Watchdog
========================================================

LPC currently supports Watchdog OR Real Time Clock OR Clocksource
functionality.

[See: ../rtc/rtc-st-lpc.txt for RTC options]
[See: ../timer/st,stih407-lpc for Clocksource options]

Required properties

- compatible 	: Should be: "st,stih407-lpc"
- reg		: LPC registers base address + size
- interrupts    : LPC interrupt line number and associated flags
- clocks	: Clock used by LPC device (See: ../clock/clock-bindings.txt)
- st,lpc-mode	: The LPC can run either one of three modes:
                  ST_LPC_MODE_RTC    [0]
                  ST_LPC_MODE_WDT    [1]
                  ST_LPC_MODE_CLKSRC [2]
		 One (and only one) mode must be selected.

Required properties [watchdog mode]

- st,syscfg	: Phandle to syscfg node used to enable watchdog and configure
		  CPU reset type.
- timeout-sec	: Watchdog timeout in seconds

Optional properties [watchdog mode]

- st,warm-reset	: If present reset type will be 'warm' - if not it will be cold

Example:
	lpc@fde05000 {
		compatible	= "st,stih407-lpc";
		reg		= <0xfde05000 0x1000>;
		clocks 		= <&clk_s_d3_flexgen CLK_LPC_0>;
		st,syscfg	= <&syscfg_core>;
		timeout-sec	= <120>;
		st,lpc-mode	= <ST_LPC_MODE_WDT>;
		st,warm-reset;
	};