From: Tero Kristo <t-kristo@ti.com>
To: <wim@linux-watchdog.org>, <linux@roeck-us.net>,
<linux-watchdog@vger.kernel.org>
Cc: <linux-kernel@vger.kernel.org>, Rob Herring <robh@kernel.org>,
<devicetree@vger.kernel.org>
Subject: [PATCH 1/4] dt-bindings: watchdog: Add support for TI K3 RTI watchdog
Date: Fri, 28 Feb 2020 16:23:28 +0200 [thread overview]
Message-ID: <20200228142331.13716-2-t-kristo@ti.com> (raw)
In-Reply-To: <20200228142331.13716-1-t-kristo@ti.com>
TI K3 SoCs contain an RTI (Real Time Interrupt) module which can be
used to implement a windowed watchdog functionality. Windowed watchdog
will generate an error if it is petted outside the time window, either
too early or too late.
Cc: Rob Herring <robh@kernel.org>
Cc: devicetree@vger.kernel.org
Signed-off-by: Tero Kristo <t-kristo@ti.com>
---
.../bindings/watchdog/ti,rti-wdt.yaml | 52 +++++++++++++++++++
1 file changed, 52 insertions(+)
create mode 100644 Documentation/devicetree/bindings/watchdog/ti,rti-wdt.yaml
diff --git a/Documentation/devicetree/bindings/watchdog/ti,rti-wdt.yaml b/Documentation/devicetree/bindings/watchdog/ti,rti-wdt.yaml
new file mode 100644
index 000000000000..3813f59fb6c3
--- /dev/null
+++ b/Documentation/devicetree/bindings/watchdog/ti,rti-wdt.yaml
@@ -0,0 +1,52 @@
+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/watchdog/ti,rti-wdt.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Texas Instruments K3 SoC Watchdog Timer
+
+maintainers:
+ - Tero Kristo <t-kristo@ti.com>
+
+description: |+
+ The TI K3 SoC watchdog timer is implemented via the RTI (Real Time
+ Interrupt) IP module. This timer adds a support for windowed watchdog
+ mode, which will signal an error if it is pinged outside the watchdog
+ time window, meaning either too early or too late. The error signal
+ generated can be routed to either interrupt a safety controller or
+ to directly reset the SoC.
+
+properties:
+ compatible:
+ enum:
+ - ti,rti-wdt
+
+ reg:
+ maxItems: 1
+
+ clocks:
+ maxItems: 1
+
+required:
+ - compatible
+ - reg
+ - clocks
+
+examples:
+ - |
+ /*
+ * RTI WDT in main domain on J721e SoC. Assigned clocks are used to
+ * select the source clock for the watchdog, forcing it to tick with
+ * a 32kHz clock in this case.
+ */
+ #include <dt-bindings/soc/ti,sci_pm_domain.h>
+
+ main_rti0: rti@2200000 {
+ compatible = "ti,rti-wdt";
+ reg = <0x0 0x2200000 0x0 0x100>;
+ clocks = <&k3_clks 252 1>;
+ power-domains = <&k3_pds 252 TI_SCI_PD_EXCLUSIVE>;
+ assigned-clocks = <&k3_clks 252 1>;
+ assigned-clock-parents = <&k3_clks 252 5>;
+ };
--
2.17.1
--
Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki. Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki
next prev parent reply other threads:[~2020-02-28 14:24 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-28 14:23 [PATCH 0/4] watchdog: add TI K3 SoC watchdog support Tero Kristo
2020-02-28 14:23 ` Tero Kristo [this message]
2020-02-28 14:23 ` [PATCH 2/4] watchdog: add support for resetting keepalive timers at start Tero Kristo
2020-02-28 17:13 ` Guenter Roeck
2020-03-02 13:09 ` Tero Kristo
2020-02-28 14:23 ` [PATCH 3/4] watchdog: Add K3 RTI watchdog support Tero Kristo
2020-02-28 17:45 ` Guenter Roeck
2020-03-02 13:07 ` Tero Kristo
2020-02-28 14:23 ` [PATCH 4/4] arm64: dts: ti: k3-j721e-main: Add MAIN domain watchdog entries Tero Kristo
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