[PATCH v2 1/2] drivers/watchdog: Add optional ASPEED device tree properties

Christopher Bostic
2017-06-27T21:18:12Z

Describe device tree optional properties:

* aspeed,arm-reet - ARM CPU reset on signal
* aspeed,soc-reset - SOC reset on signal
* aspeed,sys-reset - System reset on signal
Disabling system reset may be required in situations where
one of the other watchdog engines in the system is responsible
for this.
* aspeed,interrupt - Interrupt CPU on signal
* aspeed,external-signal - Generate external signal (WDT1 and WDT2 only)
* aspeed,alt-boot - Boot from alternate block on signal

Signed-off-by: Christopher Bostic <cbostic@linux.vnet.ibm.com>
---
v2 - Add 'aspeed,' prefix to all optional properties
- Add arm-reset, soc-reset, interrupt, alt-boot properties
---
.../devicetree/bindings/watchdog/aspeed-wdt.txt | 25 ++++++++++++++++++++++
1 file changed, 25 insertions(+)

diff --git a/Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt b/Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt
index c5e74d7..555b8b4 100644
--- a/Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt
+++ b/Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt
@@ -8,9 +8,34 @@ Required properties:
- reg: physical base address of the controller and length of memory mapped
region

+Optional properties:
+ Signal behavior - Whenever a timeout occurs, the watchdog can be programmed
+ to generate 6 types of signals:
+
+ - aspeed,arm-reset: If property is present then reset ARM CPU only.
+
+ - aspeed,soc-reset: If property is present then reset SOC.
+
+ - aspeed,sys-reset: If property is present then reset the entire chip.
+ In cases where one of the other watchdog engines
+ in the system is responsible for system reset it
+ may be required to not specify this property.
+
+ - aspeed,interrupt: If property is present then interrupt CPU.
+
+ - aspeed,external-signal: If property is present then signal is sent to
+ external reset counter (only WDT1 and WDT2).
+ - aspeed,alt-boot: If property is present then boot from alternate block.
+
Example:

wdt1: watchdog@1e785000 {
compatible = "aspeed,ast2400-wdt";
reg = <0x1e785000 0x1c>;
+ aspeed,arm-reset;
+ aspeed,soc-reset;
+ aspeed,sys-reset;
+ aspeed,interrupt;
+ aspeed,external-signal;
+ aspeed,alt-boot;
};
--
1.8.2.2