1 STMicroelectronics Low Power Controller (LPC) 1 STMicroelectronics Low Power Controller (LPC) - Watchdog
2 ============================================== 2 ========================================================
3 3
4 LPC currently supports Watchdog OR Real Time C 4 LPC currently supports Watchdog OR Real Time Clock OR Clocksource
5 functionality. 5 functionality.
6 6
7 [See: ../rtc/rtc-st-lpc.txt for RTC options] 7 [See: ../rtc/rtc-st-lpc.txt for RTC options]
8 [See: ../timer/st,stih407-lpc for Clocksource 8 [See: ../timer/st,stih407-lpc for Clocksource options]
9 9
10 Required properties 10 Required properties
11 11
12 - compatible : Should be: "st,stih407-lpc" 12 - compatible : Should be: "st,stih407-lpc"
13 - reg : LPC registers base address + 13 - reg : LPC registers base address + size
14 - interrupts : LPC interrupt line number an 14 - interrupts : LPC interrupt line number and associated flags
15 - clocks : Clock used by LPC device (Se 15 - clocks : Clock used by LPC device (See: ../clock/clock-bindings.txt)
16 - st,lpc-mode : The LPC can run either one o 16 - st,lpc-mode : The LPC can run either one of three modes:
17 ST_LPC_MODE_RTC [0] 17 ST_LPC_MODE_RTC [0]
18 ST_LPC_MODE_WDT [1] 18 ST_LPC_MODE_WDT [1]
19 ST_LPC_MODE_CLKSRC [2] 19 ST_LPC_MODE_CLKSRC [2]
20 One (and only one) mode must 20 One (and only one) mode must be selected.
21 21
22 Required properties [watchdog mode] 22 Required properties [watchdog mode]
23 23
24 - st,syscfg : Phandle to syscfg node used 24 - st,syscfg : Phandle to syscfg node used to enable watchdog and configure
25 CPU reset type. 25 CPU reset type.
26 - timeout-sec : Watchdog timeout in seconds 26 - timeout-sec : Watchdog timeout in seconds
27 27
28 Optional properties [watchdog mode] 28 Optional properties [watchdog mode]
29 29
30 - st,warm-reset : If present reset type will b 30 - st,warm-reset : If present reset type will be 'warm' - if not it will be cold
31 31
32 Example: 32 Example:
33 lpc@fde05000 { 33 lpc@fde05000 {
34 compatible = "st,stih407- 34 compatible = "st,stih407-lpc";
35 reg = <0xfde05000 35 reg = <0xfde05000 0x1000>;
36 clocks = <&clk_s_d3_f 36 clocks = <&clk_s_d3_flexgen CLK_LPC_0>;
37 st,syscfg = <&syscfg_cor 37 st,syscfg = <&syscfg_core>;
38 timeout-sec = <120>; 38 timeout-sec = <120>;
39 st,lpc-mode = <ST_LPC_MODE 39 st,lpc-mode = <ST_LPC_MODE_WDT>;
40 st,warm-reset; 40 st,warm-reset;
41 }; 41 };
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.