Commit 5cacd264 authored by Lad Prabhakar's avatar Lad Prabhakar Committed by Wim Van Sebroeck
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dt-bindings: watchdog: renesas,wdt: Add support for RZ/T2H and RZ/N2H 



Extend the Renesas WDT device tree bindings to support the watchdog timer
found on the RZ/T2H (R9A09G077) and RZ/N2H (R9A09G087) SoCs.

The RZ/T2H WDT is mostly compatible with the one found on the RZ/V2H(P),
but includes an additional register and differs in the clock division
ratio settings for the WDTCR[CKS] field. To reflect these differences,
introduce a new compatible string, "renesas,r9a09g077-wdt".

The binding schema is updated accordingly. On RZ/T2H, the WDT does not
require the "resets" property. It also requires two register regions and
the presence of a "power-domains" property. The "clock-names" property is
limited to a single entry, "pclk", for this SoC.

The RZ/N2H SoC uses the same WDT IP as the RZ/T2H. It is supported by
using "renesas,r9a09g087-wdt" as the primary compatible string, with
"renesas,r9a09g077-wdt" listed as a fallback to describe the shared
hardware features.

Example:
    wdt0: watchdog@80082000 {
        compatible = "renesas,r9a09g077-wdt";
        reg = <0 0x80082000 0 0x400>,
              <0 0x81295100 0 0x04>;
        clocks = <&cpg CPG_CORE R9A09G077_CLK_PCLKL>;
        clock-names = "pclk";
        power-domains = <&cpg>;
        status = "disabled";
    };

Signed-off-by: default avatarLad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: default avatarRob Herring (Arm) <robh@kernel.org>
Reviewed-by: default avatarGeert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: default avatarGuenter Roeck <linux@roeck-us.net>
Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
Signed-off-by: default avatarWim Van Sebroeck <wim@linux-watchdog.org>
parent bdbb4a2d

Documentation/devicetree/bindings/watchdog/renesas,wdt.yaml

+33 −3
Original line number Diff line number Diff line
@@ -81,10 +81,17 @@ properties: 
              - renesas,r9a09g056-wdt # RZ/V2N

          - const: renesas,r9a09g057-wdt # RZ/V2H(P)



      - const: renesas,r9a09g057-wdt       # RZ/V2H(P)

      - enum:

          - renesas,r9a09g057-wdt    # RZ/V2H(P)

          - renesas,r9a09g077-wdt    # RZ/T2H



      - items:

          - const: renesas,r9a09g087-wdt # RZ/N2H

          - const: renesas,r9a09g077-wdt # RZ/T2H



  reg:

    maxItems: 1

    minItems: 1

    maxItems: 2



  interrupts:

    minItems: 1
@@ -132,6 +139,7 @@ allOf: 
          compatible:

            contains:

              enum:

                - renesas,r9a09g077-wdt

                - renesas,rza-wdt

                - renesas,rzn1-wdt

    then:
@@ -183,7 +191,9 @@ allOf: 
      properties:

        compatible:

          contains:

            const: renesas,r9a09g057-wdt

            enum:

              - renesas,r9a09g057-wdt

              - renesas,r9a09g077-wdt

    then:

      properties:

        interrupts: false
@@ -192,6 +202,26 @@ allOf: 
      required:

        - interrupts



  - if:

      properties:

        compatible:

          contains:

            const: renesas,r9a09g077-wdt

    then:

      properties:

        resets: false

        clock-names:

          maxItems: 1

        reg:

          minItems: 2

      required:

        - clock-names

        - power-domains

    else:

      properties:

        reg:

          maxItems: 1



additionalProperties: false



examples: