From: Christopher Bostic <cbostic@linux.vnet.ibm.com>
To: wim@iguana.be, linux@roeck-us.net, robh+dt@kernel.org,
mark.rutland@arm.com, joel@jms.id.au,
linux-watchdog@vger.kernel.org, devicetree@vger.kernel.org
Cc: Christopher Bostic <cbostic@linux.vnet.ibm.com>,
linux-kernel@vger.kernel.org
Subject: [PATCH v2 1/2] drivers/watchdog: Add optional ASPEED device tree properties
Date: Tue, 27 Jun 2017 16:17:33 -0500 [thread overview]
Message-ID: <20170627211734.60477-2-cbostic@linux.vnet.ibm.com> (raw)
In-Reply-To: <20170627211734.60477-1-cbostic@linux.vnet.ibm.com>
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
next prev parent reply other threads:[~2017-06-27 21:18 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-27 21:17 [PATCH v2 0/2] Add ASPEED watchdog device tree properties Christopher Bostic
2017-06-27 21:17 ` Christopher Bostic [this message]
2017-06-27 21:32 ` [PATCH v2 1/2] drivers/watchdog: Add optional ASPEED " Guenter Roeck
2017-06-27 21:42 ` Christopher Bostic
2017-06-27 22:07 ` Guenter Roeck
2017-06-28 14:55 ` Christopher Bostic
2017-06-28 15:06 ` Guenter Roeck
2017-06-27 21:17 ` [PATCH v2 2/2] drivers/watchdog: ASPEED reference dev tree properties for config Christopher Bostic
2017-06-28 11:31 ` Guenter Roeck
2017-06-28 14:29 ` Christopher Bostic
2017-06-28 14:54 ` Guenter Roeck
2017-06-28 14:59 ` Christopher Bostic
2017-06-28 15:08 ` Guenter Roeck
2017-06-28 15:55 ` Christopher Bostic
2017-06-28 16:06 ` Guenter Roeck
2017-06-28 16:09 ` Christopher Bostic
2017-06-28 17:52 ` Guenter Roeck
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