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[212.71.14.70]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-49fe0c3731fsm57230235e9.2.2026.09.23.06.13.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 23 Sep 2026 06:13:43 -0700 (PDT) From: Sander Speetjens To: Alexandre Belloni Cc: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Florian Fainelli , Jonathan Bell , Stefan Wahren , linux-rtc@vger.kernel.org, devicetree@vger.kernel.org, linux-rpi-kernel@lists.infradead.org, linux-arm-kernel@lists.infradead.org, sander.speetjens@gmail.com Subject: [PATCH v4 1/2] dt-bindings: rtc: Add property for Raspberry Pi 5 RTC Date: Wed, 23 Sep 2026 15:13:22 +0200 Message-ID: <20260923131323.1099979-2-sander.speetjens@gmail.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260923131323.1099979-1-sander.speetjens@gmail.com> References: <20260923131323.1099979-1-sander.speetjens@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260923_061346_750899_6D44AD75 X-CRM114-Status: GOOD ( 11.43 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org The Raspberry Pi 5 has a built-in RTC that can be battery-backed via the VBAT pin. When a rechargeable coin cell is used, the hardware requires a trickle-charge voltage to keep the battery topped up. Expose the trickle-voltage-millivolt DT property so the driver can program the correct charge voltage for board specific configurations with the attached battery. Signed-off-by: Sander Speetjens --- V3 -> V4: Add a reff to uint32 V2 -> V3: Fixed the firmware property naming V1 -> V2: As discussed with Krzysztof Kozlowski, this property is folded into the existing raspberrypi,bcm2835-firmware properties. .../bindings/arm/bcm/raspberrypi,bcm2835-firmware.yaml | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/Documentation/devicetree/bindings/arm/bcm/raspberrypi,bcm2835-firmware.yaml b/Documentation/devicetree/bindings/arm/bcm/raspberrypi,bcm2835-firmware.yaml index 983ea80eaec9..9349fc8908a5 100644 --- a/Documentation/devicetree/bindings/arm/bcm/raspberrypi,bcm2835-firmware.yaml +++ b/Documentation/devicetree/bindings/arm/bcm/raspberrypi,bcm2835-firmware.yaml @@ -133,6 +133,13 @@ properties: required: - compatible + trickle-voltage-millivolt: + allOf: + - $ref: /schemas/rtc/rtc.yaml#/properties/trickle-voltage-millivolt + - $ref: /schemas/types.yaml#/definitions/uint32 + - minimum: 1300 + maximum: 5000 + required: - compatible - mboxes @@ -144,6 +151,7 @@ examples: firmware { compatible = "raspberrypi,bcm2835-firmware", "simple-mfd"; mboxes = <&mailbox>; + trickle-voltage-millivolt = <3300>; firmware_clocks: clocks { compatible = "raspberrypi,firmware-clocks"; -- 2.55.0