From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from inva021.nxp.com (inva021.nxp.com [92.121.34.21]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 823AD3E7179; Mon, 24 Aug 2026 06:55:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=92.121.34.21 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787554549; cv=none; b=SPLJV+jWUpQnnVbLAZ33bdTUqlL5z6rvUf82EGwi/enyF4jXlbMXly65OdLPVWyqqlCTpPlyiQmoikjoJTeoM9iELPLQ/aB6kuXxk9bMJ30t9sFzNFgGvZ80UJhQW5dsbEifPPExy+1pdsaU7IOfT4Or6uDL3ytVCl/rnyMvobo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787554549; c=relaxed/simple; bh=WxRlZjVNETTMSTcclpLOqw9plGQYEebMiGINfrHFxDU=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=hNuZOMzqcsMLsFRQR4sfhjPgrMVsCXMd2bWCIb8H8weHXAU+K8xIhjJ8datijvysaM6iNWw8MRYWVPRGv47hCyo2dl8fPaB8snEUvecH7T8Za+N3oolioXbtqojZT/fT7J+FkYAc7gOhIZHyVnhhO7LJeTKFMEqb6TtKLvh5Zxk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=nxp.com; spf=pass smtp.mailfrom=nxp.com; arc=none smtp.client-ip=92.121.34.21 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=nxp.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=nxp.com Received: from inva021.nxp.com (localhost [127.0.0.1]) by inva021.eu-rdc02.nxp.com (Postfix) with ESMTP id 24994200097; Mon, 24 Aug 2026 08:55:40 +0200 (CEST) Received: from aprdc01srsp001v.ap-rdc01.nxp.com (aprdc01srsp001v.ap-rdc01.nxp.com [165.114.16.16]) by inva021.eu-rdc02.nxp.com (Postfix) with ESMTP id E288D20009F; Mon, 24 Aug 2026 08:55:39 +0200 (CEST) Received: from lsv031125.swis.in-blr01.nxp.com (lsv031125.swis.in-blr01.nxp.com [10.12.177.172]) by aprdc01srsp001v.ap-rdc01.nxp.com (Postfix) with ESMTP id B18A718000B6; Mon, 24 Aug 2026 14:55:36 +0800 (+08) From: Shiv Prakash Gupta To: linux-kernel@vger.kernel.org, linux-rtc@vger.kernel.org, linux-hwmon@vger.kernel.org, linux-watchdog@vger.kernel.org, devicetree@vger.kernel.org, alexandre.belloni@bootlin.com, krzk+dt@kernel.org, robh@kernel.org, conor+dt@kernel.org, linux@roeck-us.net, wim@linux-watchdog.org Cc: vikash.bansal@nxp.com, priyanka.jain@nxp.com, lakshay.piplani@nxp.com, Shiv Prakash Gupta Subject: [PATCH v2 1/4] dt-bindings: rtc: Add NXP PCF8525 RTC Date: Mon, 24 Aug 2026 12:25:28 +0530 Message-Id: <20260824065531.693701-2-shivprakash.gupta@nxp.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260824065531.693701-1-shivprakash.gupta@nxp.com> References: <20260824065531.693701-1-shivprakash.gupta@nxp.com> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Virus-Scanned: ClamAV using ClamSMTP Add a Devicetree binding for the NXP PCF8525 I2C RTC. Describe the optional INTA interrupt used for RTC alarm and timestamp events, and the INTB interrupt used by the watchdog. Add properties to select the external crystal load capacitance and temperature-compensation crystal model. Also allow the common start-year, wakeup-source and reset-source properties, with reset-source enabling watchdog registration Signed-off-by: Lakshay Piplani Signed-off-by: Shiv Prakash Gupta Reviewed-by: Rob Herring (Arm) --- Changes in v2: - No changes to DT binding --- .../devicetree/bindings/rtc/nxp,pcf8525.yaml | 86 +++++++++++++++++++ 1 file changed, 86 insertions(+) create mode 100644 Documentation/devicetree/bindings/rtc/nxp,pcf8525.yaml diff --git a/Documentation/devicetree/bindings/rtc/nxp,pcf8525.yaml b/Documentation/devicetree/bindings/rtc/nxp,pcf8525.yaml new file mode 100644 index 000000000000..bee71ec3da80 --- /dev/null +++ b/Documentation/devicetree/bindings/rtc/nxp,pcf8525.yaml @@ -0,0 +1,86 @@ +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/rtc/nxp,pcf8525.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: NXP PCF8525 Real Time Clock + +description: + The PCF8525 is an I2C real-time clock with alarm, timestamp, watchdog, + backup battery switch-over, and temperature compensation for an external + 32.768 kHz crystal. + +allOf: + - $ref: rtc.yaml# + +maintainers: + - Lakshay Piplani + - Shiv Prakash Gupta + +properties: + compatible: + enum: + - nxp,pcf8525 + + reg: + maxItems: 1 + + interrupts: + minItems: 1 + maxItems: 2 + description: + INTA, followed by INTB when both interrupt outputs are connected. + + interrupt-names: + minItems: 1 + items: + - const: inta + - const: intb + + quartz-load-femtofarads: + description: + Effective load capacitance of the external 32.768 kHz crystal. + enum: [6000, 7000] + default: 6000 + + nxp,xtal-type: + $ref: /schemas/types.yaml#/definitions/uint32 + description: + Crystal model used by the temperature compensation engine. + Value 1 selects -0.035 ppm/degC^2 and value 2 selects + -0.04 ppm/degC^2. + enum: [1, 2] + default: 1 + + start-year: true + + wakeup-source: true + + reset-source: true + +required: + - compatible + - reg + +additionalProperties: false + +examples: + - | + #include + i2c { + #address-cells = <1>; + #size-cells = <0>; + + rtc@51 { + compatible = "nxp,pcf8525"; + reg = <0x51>; + interrupt-parent = <&gpio2>; + interrupts = <2 IRQ_TYPE_EDGE_FALLING>, + <3 IRQ_TYPE_EDGE_FALLING>; + interrupt-names = "inta", "intb"; + quartz-load-femtofarads = <7000>; + nxp,xtal-type = <2>; + reset-source; + }; + }; -- 2.34.1