[PATCH v3 1/6] dt-bindings: watchdog: renesas,wdt: Add support for RZ/T2H and RZ/N2H
From: Prabhakar <prabhakar.csengg@gmail.com>
Date: 2025-08-04 19:57:31
Also in:
linux-renesas-soc, linux-watchdog, lkml
Subsystem:
open firmware and flattened device tree bindings, the rest, watchdog device drivers · Maintainers:
Rob Herring, Krzysztof Kozlowski, Conor Dooley, Linus Torvalds, Wim Van Sebroeck, Guenter Roeck
From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com> 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. Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com> Reviewed-by: Rob Herring (Arm) <robh@kernel.org> --- v2->v3: - No changes. v1->v2: - Dropped items from clock-names and instead added maxItems: 1. - Added reviewed-by from Rob. --- .../bindings/watchdog/renesas,wdt.yaml | 36 +++++++++++++++++-- 1 file changed, 33 insertions(+), 3 deletions(-)
diff --git a/Documentation/devicetree/bindings/watchdog/renesas,wdt.yaml b/Documentation/devicetree/bindings/watchdog/renesas,wdt.yaml
index 78874b90c88c..b6e60162c263 100644
--- a/Documentation/devicetree/bindings/watchdog/renesas,wdt.yaml
+++ b/Documentation/devicetree/bindings/watchdog/renesas,wdt.yaml@@ -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:
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2.50.1