| # SPDX-License-Identifier: GPL-2.0-only |
| %YAML 1.2 |
| --- |
| $id: http://devicetree.org/schemas/watchdog/snps,dw-wdt.yaml# |
| $schema: http://devicetree.org/meta-schemas/core.yaml# |
| |
| title: Synopsys Designware Watchdog Timer |
| |
| allOf: |
| - $ref: "watchdog.yaml#" |
| |
| maintainers: |
| - Jamie Iles <jamie@jamieiles.com> |
| |
| properties: |
| compatible: |
| const: snps,dw-wdt |
| |
| reg: |
| maxItems: 1 |
| |
| interrupts: |
| description: DW Watchdog pre-timeout interrupt |
| maxItems: 1 |
| |
| clocks: |
| minItems: 1 |
| items: |
| - description: Watchdog timer reference clock |
| - description: APB3 interface clock |
| |
| clock-names: |
| minItems: 1 |
| items: |
| - const: tclk |
| - const: pclk |
| |
| resets: |
| description: Phandle to the DW Watchdog reset lane |
| maxItems: 1 |
| |
| snps,watchdog-tops: |
| $ref: /schemas/types.yaml#/definitions/uint32-array |
| description: | |
| DW APB Watchdog custom timer intervals - Timeout Period ranges (TOPs). |
| Each TOP is a number loaded into the watchdog counter at the moment of |
| the timer restart. The counter decrementing happens each tick of the |
| reference clock. Therefore the TOPs array is equivalent to an array of |
| the timer expiration intervals supported by the DW APB Watchdog. Note |
| DW APB Watchdog IP-core might be synthesized with fixed TOP values, |
| in which case this property is unnecessary with default TOPs utilized. |
| default: [0x0001000 0x0002000 0x0004000 0x0008000 |
| 0x0010000 0x0020000 0x0040000 0x0080000 |
| 0x0100000 0x0200000 0x0400000 0x0800000 |
| 0x1000000 0x2000000 0x4000000 0x8000000] |
| minItems: 16 |
| maxItems: 16 |
| |
| unevaluatedProperties: false |
| |
| required: |
| - compatible |
| - reg |
| - clocks |
| |
| examples: |
| - | |
| watchdog@ffd02000 { |
| compatible = "snps,dw-wdt"; |
| reg = <0xffd02000 0x1000>; |
| interrupts = <0 171 4>; |
| clocks = <&per_base_clk>; |
| resets = <&wdt_rst>; |
| }; |
| |
| - | |
| watchdog@ffd02000 { |
| compatible = "snps,dw-wdt"; |
| reg = <0xffd02000 0x1000>; |
| interrupts = <0 171 4>; |
| clocks = <&per_base_clk>; |
| clock-names = "tclk"; |
| snps,watchdog-tops = <0x000000FF 0x000001FF 0x000003FF |
| 0x000007FF 0x0000FFFF 0x0001FFFF |
| 0x0003FFFF 0x0007FFFF 0x000FFFFF |
| 0x001FFFFF 0x003FFFFF 0x007FFFFF |
| 0x00FFFFFF 0x01FFFFFF 0x03FFFFFF |
| 0x07FFFFFF>; |
| }; |
| ... |
