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Thu, 09 Jul 2026 15:19:58 -0700 (PDT) Received: from Tejas-Legion-7-16IRX9.am.students.amrita.edu ([117.193.77.254]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-13b6596681fsm40380498c88.8.2026.07.09.15.19.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 09 Jul 2026 15:19:58 -0700 (PDT) From: Teja Sai Charan B To: Alexandre Belloni , Rob Herring , Krzysztof Kozlowski , Conor Dooley Cc: linux-rtc@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Teja Sai Charan Bellamkonda Subject: [PATCH v3] dt-bindings: rtc: Convert rtc-cmos binding to YAML Date: Fri, 10 Jul 2026 03:49:44 +0530 Message-ID: <20260709221944.159244-1-tejaasaye@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Teja Sai Charan Bellamkonda Convert the rtc-cmos devicetree bindings to dt schema. The original text binding documents only the motorola,mc146818 compatible. Existing in-tree Devicetree sources also use the intel,ce4100-rtc compatible together with the motorola,mc146818 fallback, but this was not documented. Document the Intel variant in the schema so that these existing configurations are accepted during schema validation. Signed-off-by: Teja Sai Charan Bellamkonda --- Changes in v2: - Allow intel,ce4100-rtc compatible used by existing DTS files Changes in v3: - Drop accidentally added result.txt - Fix example unit-address to match reg property --- .../devicetree/bindings/rtc/rtc-cmos.txt | 27 -------- .../devicetree/bindings/rtc/rtc-cmos.yaml | 63 +++++++++++++++++++ 2 files changed, 63 insertions(+), 27 deletions(-) delete mode 100644 Documentation/devicetree/bindings/rtc/rtc-cmos.txt create mode 100644 Documentation/devicetree/bindings/rtc/rtc-cmos.yaml diff --git a/Documentation/devicetree/bindings/rtc/rtc-cmos.txt b/Documentation/devicetree/bindings/rtc/rtc-cmos.txt deleted file mode 100644 index 7d7b5f6bda65..000000000000 --- a/Documentation/devicetree/bindings/rtc/rtc-cmos.txt +++ /dev/null @@ -1,27 +0,0 @@ - Motorola mc146818 compatible RTC -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - -Required properties: - - compatible : "motorola,mc146818" - - reg : should contain registers location and length. - -Optional properties: - - interrupts : should contain interrupt. - - ctrl-reg : Contains the initial value of the control register also - called "Register B". - - freq-reg : Contains the initial value of the frequency register also - called "Register A". - -"Register A" and "B" are usually initialized by the firmware (BIOS for -instance). If this is not done, it can be performed by the driver. - -ISA Example: - - rtc@70 { - compatible = "motorola,mc146818"; - interrupts = <8 3>; - interrupt-parent = <&ioapic1>; - ctrl-reg = <2>; - freq-reg = <0x26>; - reg = <1 0x70 2>; - }; diff --git a/Documentation/devicetree/bindings/rtc/rtc-cmos.yaml b/Documentation/devicetree/bindings/rtc/rtc-cmos.yaml new file mode 100644 index 000000000000..e37927e9916c --- /dev/null +++ b/Documentation/devicetree/bindings/rtc/rtc-cmos.yaml @@ -0,0 +1,63 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/rtc/rtc-cmos.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Motorola mc146818 compatible RTC + +maintainers: + - Alexandre Belloni + +properties: + compatible: + oneOf: + - const: motorola,mc146818 + + - items: + - const: intel,ce4100-rtc + - const: motorola,mc146818 + + reg: + maxItems: 1 + + interrupts: + maxItems: 1 + + ctrl-reg: + $ref: /schemas/types.yaml#/definitions/uint32 + description: + Initial value of the control register + (also known as Register B). + + freq-reg: + $ref: /schemas/types.yaml#/definitions/uint32 + description: + Initial value of the frequency register + (also known as Register A). + +required: + - compatible + - reg + +allOf: + - $ref: rtc.yaml# + +unevaluatedProperties: false + +examples: + - | + bus { + #address-cells = <2>; + #size-cells = <1>; + + rtc@1,70 { + compatible = "motorola,mc146818"; + reg = <0x1 0x70 0x2>; + + interrupts = <8 3>; + + ctrl-reg = <2>; + freq-reg = <0x26>; + }; + }; -- 2.43.0