watchdog: bindings: Provide ST bindings for ST's LPC Watchdog device

On current ST platforms the LPC controls a number of functions including
Watchdog and Real Time Clock.  This patch provides the bindings used to
configure LPC in Watchdog mode.

Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Lee Jones 2015-04-09 15:47:30 +01:00 committed by Wim Van Sebroeck
parent 97faf05aa6
commit 6f48fdf3bb
1 changed files with 38 additions and 0 deletions

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STMicroelectronics Low Power Controller (LPC) - Watchdog
========================================================
LPC currently supports Watchdog OR Real Time Clock functionality.
[See: ../rtc/rtc-st-lpc.txt for RTC options]
Required properties
- compatible : Must be one of: "st,stih407-lpc" "st,stih416-lpc"
"st,stih415-lpc" "st,stid127-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 two modes ST_LPC_MODE_RTC [0] or
ST_LPC_MODE_WDT [1]. 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;
};