37 lines
1.2 KiB
Plaintext
37 lines
1.2 KiB
Plaintext
|
* Qualcomm MSM Watchdog
|
||
|
|
|
||
|
|
Watchdog timer is configured with a bark and a bite time.
|
||
|
|
if the watchdog is not "pet" at regular intervals, the system
|
||
|
|
is assumed to have become non responsive and needs to be reset.
|
||
|
|
A warning in the form of a bark timeout leads to a bark interrupt
|
||
|
|
and a kernel panic. if the watchdog timer is still not reset,
|
||
|
|
a bite timeout occurs, which is an interrupt in the secure mode,
|
||
|
|
which leads to a reset of the SOC via the secure watchdog. The
|
||
|
|
driver needs the petting time, and the bark timeout to be programmed
|
||
|
|
into the watchdog, as well as the bark and bite irqs.
|
||
|
|
|
||
|
|
The device tree parameters for the watchdog are:
|
||
|
|
|
||
|
|
Required properties:
|
||
|
|
|
||
|
|
- compatible : "qcom,msm-watchdog"
|
||
|
|
- reg : offset and length of the register set for the watchdog block.
|
||
|
|
- interrupts : should contain bark and bite irq numbers
|
||
|
|
- qcom,pet-time : Non zero time interval at which watchdog should be pet in ms.
|
||
|
|
- qcom,bark-time : Non zero timeout value for a watchdog bark in ms.
|
||
|
|
|
||
|
|
Optional properties:
|
||
|
|
|
||
|
|
- qcom,ipi-ping : (boolean) send keep alive ping to other cpus if present
|
||
|
|
|
||
|
|
Example:
|
||
|
|
|
||
|
|
qcom,wdt@f9017000 {
|
||
|
|
compatible = "qcom,msm-watchdog";
|
||
|
|
reg = <0xf9017000 0x1000>;
|
||
|
|
interrupts = <0 3 0>, <0 4 0>;
|
||
|
|
qcom,bark-time = <11000>;
|
||
|
|
qcom,pet-time = <10000>;
|
||
|
|
qcom,ipi-ping;
|
||
|
|
};
|