Commit 4ce4e7fd authored by Serge Semin's avatar Serge Semin Committed by Wim Van Sebroeck
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dt-bindings: watchdog: dw-wdt: Add watchdog TOPs array property 



In case if DW Watchdog IP core is built with WDT_USE_FIX_TOP == false,
a custom timeout periods are used to preset the timer counter. In
this case that periods should be specified in a new "snps,watchdog-tops"
property of the DW watchdog dts node.

Signed-off-by: default avatarSerge Semin <Sergey.Semin@baikalelectronics.ru>
Reviewed-by: default avatarRob Herring <robh@kernel.org>
Reviewed-by: default avatarGuenter Roeck <linux@roeck-us.net>
Cc: Alexey Malahov <Alexey.Malahov@baikalelectronics.ru>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: linux-mips@vger.kernel.org
Link: https://lore.kernel.org/r/20200530073557.22661-4-Sergey.Semin@baikalelectronics.ru


Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
Signed-off-by: default avatarWim Van Sebroeck <wim@linux-watchdog.org>
parent 5b4f68f8

Documentation/devicetree/bindings/watchdog/snps,dw-wdt.yaml

+32 −0
Original line number Diff line number Diff line
@@ -39,6 +39,23 @@ properties: 
    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:
@@ -55,4 +72,19 @@ examples: 
      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>;

    };

...

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