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Wed, 20 Aug 2025 13:23:25 -0700 (PDT) Received: from iku.Home ([2a06:5906:61b:2d00:9b1:f84b:89f6:b00e]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3c0754f3b7esm8471059f8f.30.2025.08.20.13.23.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 20 Aug 2025 13:23:25 -0700 (PDT) From: Prabhakar X-Google-Original-From: Prabhakar To: Wim Van Sebroeck , Guenter Roeck , Rob Herring , Geert Uytterhoeven , Krzysztof Kozlowski , Conor Dooley , Philipp Zabel , Magnus Damm , Wolfram Sang Cc: linux-watchdog@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-renesas-soc@vger.kernel.org, Prabhakar , Biju Das , Fabrizio Castro , Lad Prabhakar Subject: [PATCH v4 1/6] dt-bindings: watchdog: renesas,wdt: Add support for RZ/T2H and RZ/N2H Date: Wed, 20 Aug 2025 21:23:17 +0100 Message-ID: <20250820202322.2051969-2-prabhakar.mahadev-lad.rj@bp.renesas.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20250820202322.2051969-1-prabhakar.mahadev-lad.rj@bp.renesas.com> References: <20250820202322.2051969-1-prabhakar.mahadev-lad.rj@bp.renesas.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Lad Prabhakar 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 =3D "renesas,r9a09g077-wdt"; reg =3D <0 0x80082000 0 0x400>, <0 0x81295100 0 0x04>; clocks =3D <&cpg CPG_CORE R9A09G077_CLK_PCLKL>; clock-names =3D "pclk"; power-domains =3D <&cpg>; status =3D "disabled"; }; Signed-off-by: Lad Prabhakar Reviewed-by: Rob Herring (Arm) Reviewed-by: Geert Uytterhoeven Reviewed-by: Guenter Roeck --- v3->v4: - Updated commit message to include example node - Added reviewed-by from Geert. 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) =20 - - 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 =20 reg: - maxItems: 1 + minItems: 1 + maxItems: 2 =20 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 =20 + - 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 =20 examples: --=20 2.51.0