From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f182.google.com (mail-pl1-f182.google.com [209.85.214.182]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id F004330AD12 for ; Wed, 12 Nov 2025 11:17:42 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.182 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762946264; cv=none; b=sV7jNCA3ibPS6Rrvi+AX2PoxACUv3+A3SLa0em2vb6q1PBqmi+HrDOJY5Pkt5iw4I9R3AGma7vqdM+V0kZagpfhTNubAm1zX44T7LjhFcJoFc/zpCZh+1LWNfB4nkn+04JkMBZ6gsd33xFF9kuDTaHPkywVU3DVleplLNGmUpuA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762946264; c=relaxed/simple; bh=Ys2W7bVXS/rMb7lzjzuNB+sgh7O/1vg8ds/1vxXK880=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=sSF0qBiYn6UWlLEPEjjYhSj0NgZmAoOOKReWKbV4Of7ph9oKoR3+qT+T4982IXLkxtPvWp6fMrwfBs73614pHkVLuzdFH7gf9O9WE/ztdnZO/LQN+I12tBrivH0tDrcBbe47E6vtwVFDnPU3kN0J7PnS40LTkVY8ruaZpXxAqow= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=DUSRk/W/; arc=none smtp.client-ip=209.85.214.182 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="DUSRk/W/" Received: by mail-pl1-f182.google.com with SMTP id d9443c01a7336-297f35be2ffso7836665ad.2 for ; Wed, 12 Nov 2025 03:17:42 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1762946262; x=1763551062; darn=vger.kernel.org; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:from:to:cc:subject:date:message-id :reply-to; bh=LgbjWrvK8elb98wH0NVYO1wkwh6HfRo9teorVSr5yAE=; b=DUSRk/W/7kxoQPlXuFGKfdyz1kBDZleJTZrsizgg8H1XB7tceYe+rzWa2DmcsbPAkS DNmbKhhOzX5NTnLiwqo5gM6b4LU6WiiFS3LOT0bCcYuNaYWYI+Xe/YR2pmGDIw7cd+y6 dr8JOSJh7DVcyCVZDvILlysESzw5ck9D6tD1jCTMcX+IKe8OykwZ5nWKFp6wDOet2aKN euTXx96qkemvzmHu0YkrAigsxDCP2Ar3dxEtuyOORyhXsNtkFDlmvZvVUTelwQPLjeDa M+YPtUQFJU7TiO9FvKpdobOXHXEs7xjK7RMDtLyJ72ra11hDgM3xr5s7zrTzKSu4+VLB fvvg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1762946262; x=1763551062; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:x-gm-gg:x-gm-message-state:from:to :cc:subject:date:message-id:reply-to; bh=LgbjWrvK8elb98wH0NVYO1wkwh6HfRo9teorVSr5yAE=; b=gj7SQn7psORHKHwPEigceuSZ0WTI/yZeItTpiGB0bCWx8BazNqDeDHCbiaxlrHWbB5 A5QPONa9bQgXzN3S6SqCJlfONokg/vVfgYsXvqVLlY2IQn7Lq7xvnLG3JpnHcEseAfJS 0teysYTRHKG0H+uhNKsXuycmng3zreMwwaxhWH8J8oGp/+wHwgr3/6uXk1LAJvR5O/CS Stp6Q0Iy4oX1IxwGteH3ephkStqKK+mhh3b4b4lhDwBFHRokHZ2Krg7tgGea91RYmcWV Zz3aCIkU/40pbUbPP9jg6iEoru007cJtPlcjkaY4HMc2sCDFHc//ytL1PJVaEjUY3bWM lGnw== X-Forwarded-Encrypted: i=1; AJvYcCWoDFYgqzIgxMpqI6d0kKlyG6nRQtUYMF8iAPeWcTIzf4rrgSro9kWJynU1hhMr98fiSH8xm/G0JIM=@vger.kernel.org X-Gm-Message-State: AOJu0YyXy7FmPvnbqxttWRknLWS2mkYGjLploGFh7BAoDVG7jZsjFaHQ /QC+tWUSnhqxgh8f2ZPlnRafQg3o5h3swNs5p2+UhluNd1MW9rmHU8Da X-Gm-Gg: ASbGnctZF3UV8aMQnP51CfhYTGPTjHnOk4eEO3LtaLk5nWvJCFSXW6s5rkOb0crOu8E CvXHBKAu++XwucDY7gxno/aRSrw0UTaw9sU5ZBvlihAMcU2h85b9Mmn5/FUJsFx8mEbiQTW1JAe esRgnYdtqRddSeXQH0ssPSJPeAc0k39YDKKdMO8138MZ/C2f+PjZ1/BHaihQPaYrhgZrgjNOk8+ uWjopqxJpmKiotsvyQz8bQAcoSEyiMS6tJeWJHBG3eV6h8j5yDRe4GvtxaPlntGK24EP+SsTK2o +6bsf21540UqZ/grrZSn4t/QgTsyKEmZu+QUoUrl/xk3rKWqyJJ36/www+p7h9+LU7aBr033+0E HNFLBnJSAnAJ3ecmK3L15RxkF+qDrWJNjg7NarEAw5/6VuGFcQwXW07lzAyxGby3FKkXisY18sV +dI9NpcJ2KhOgxpMPAJGgPwzKbD3KItEtOqaxgf88ydl8vxGt3envQbisKwx8AIMFRd1nXDGf9S 67yAHMra+fMSyL+n8J6QJdFtMuqNnK3kMDeyihjhFSmg5gLaSr6jJE= X-Google-Smtp-Source: AGHT+IHzzKGS6ukPiu3qZhs2xy9KjVsM2L0MFpMuDNYIYeYdSYNgHuNotiH+CMNMtQb/4PcLQUYTDA== X-Received: by 2002:a17:902:dac3:b0:262:9c4:5470 with SMTP id d9443c01a7336-2984edc800amr35769115ad.28.1762946262292; Wed, 12 Nov 2025 03:17:42 -0800 (PST) Received: from [192.168.2.3] (2403-580a-80ed-0-4835-5a07-49e7-f115.ip6.aussiebb.net. [2403:580a:80ed:0:4835:5a07:49e7:f115]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2984dca0f28sm27386695ad.60.2025.11.12.03.17.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 12 Nov 2025 03:17:42 -0800 (PST) From: James Calligeros Date: Wed, 12 Nov 2025 21:16:47 +1000 Subject: [PATCH v5 01/11] dt-bindings: rtc: Add Apple SMC RTC Precedence: bulk X-Mailing-List: linux-rtc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20251112-macsmc-subdevs-v5-1-728e4b91fe81@gmail.com> References: <20251112-macsmc-subdevs-v5-0-728e4b91fe81@gmail.com> In-Reply-To: <20251112-macsmc-subdevs-v5-0-728e4b91fe81@gmail.com> To: Sven Peter , Janne Grunau , Alyssa Rosenzweig , Neal Gompa , Lee Jones , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Alexandre Belloni , Jean Delvare , Guenter Roeck , Dmitry Torokhov , Jonathan Corbet , James Calligeros Cc: asahi@lists.linux.dev, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-rtc@vger.kernel.org, linux-hwmon@vger.kernel.org, linux-input@vger.kernel.org, linux-doc@vger.kernel.org, Mark Kettenis X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=3352; i=jcalligeros99@gmail.com; h=from:subject:message-id; bh=5rnjjuFINxFZvoBYoUd9LjmfgXR+dmJkDEVsibGRKy8=; b=owGbwMvMwCV2xczoYuD3ygTG02pJDJkiOUce1qazTeLmfLnTij+44+21Ts/axefvRd7jOmBRU 6pv9ja2YyILgxgXg6WYIsuGJiGP2UZsN/tFKvfCzGFlAhkiLdLAAAQsDHy5iXmlRjpGeqbahnqG hjrGOkYMXJwCMNUs3IwMU197tywX5rA+6qDHltJfezFg8be1XbntnS9kApWe7Ds4keF/nM3UDPv tslv37N+8xk+vWWvFol0ZHk2ZujrVi9y4D0xiBgA= X-Developer-Key: i=jcalligeros99@gmail.com; a=openpgp; fpr=B08212489B3206D98F1479BDD43632D151F77960 From: Sven Peter Apple Silicon Macs (M1, etc.) have an RTC that is part of the PMU IC, but most of the PMU functionality is abstracted out by the SMC. An additional RTC offset stored inside NVMEM is required to compute the current date/time. Reviewed-by: Mark Kettenis Reviewed-by: Neal Gompa Reviewed-by: Rob Herring (Arm) Signed-off-by: Sven Peter Signed-off-by: James Calligeros --- .../bindings/mfd/apple,smc.yaml | 9 +++++++ .../bindings/rtc/apple,smc-rtc.yaml | 35 +++++++++++++++++++++++++ MAINTAINERS | 1 + 3 files changed, 45 insertions(+) diff --git a/Documentation/devicetree/bindings/mfd/apple,smc.yaml b/Documentation/devicetree/bindings/mfd/apple,smc.yaml index 5429538f7e2e..0410e712c900 100644 --- a/Documentation/devicetree/bindings/mfd/apple,smc.yaml +++ b/Documentation/devicetree/bindings/mfd/apple,smc.yaml @@ -46,6 +46,9 @@ properties: reboot: $ref: /schemas/power/reset/apple,smc-reboot.yaml + rtc: + $ref: /schemas/rtc/apple,smc-rtc.yaml + additionalProperties: false required: @@ -80,5 +83,11 @@ examples: nvmem-cell-names = "shutdown_flag", "boot_stage", "boot_error_count", "panic_count"; }; + + rtc { + compatible = "apple,smc-rtc"; + nvmem-cells = <&rtc_offset>; + nvmem-cell-names = "rtc_offset"; + }; }; }; diff --git a/Documentation/devicetree/bindings/rtc/apple,smc-rtc.yaml b/Documentation/devicetree/bindings/rtc/apple,smc-rtc.yaml new file mode 100644 index 000000000000..607b610665a2 --- /dev/null +++ b/Documentation/devicetree/bindings/rtc/apple,smc-rtc.yaml @@ -0,0 +1,35 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/rtc/apple,smc-rtc.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Apple SMC RTC + +description: + Apple Silicon Macs (M1, etc.) have an RTC that is part of the PMU IC, + but most of the PMU functionality is abstracted out by the SMC. + An additional RTC offset stored inside NVMEM is required to compute + the current date/time. + +maintainers: + - Sven Peter + +properties: + compatible: + const: apple,smc-rtc + + nvmem-cells: + items: + - description: 48bit RTC offset, specified in 32768 (2^15) Hz clock ticks + + nvmem-cell-names: + items: + - const: rtc_offset + +required: + - compatible + - nvmem-cells + - nvmem-cell-names + +additionalProperties: false diff --git a/MAINTAINERS b/MAINTAINERS index f0c8b85baa6b..51942a9a9b43 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -2439,6 +2439,7 @@ F: Documentation/devicetree/bindings/pinctrl/apple,pinctrl.yaml F: Documentation/devicetree/bindings/power/apple* F: Documentation/devicetree/bindings/power/reset/apple,smc-reboot.yaml F: Documentation/devicetree/bindings/pwm/apple,s5l-fpwm.yaml +F: Documentation/devicetree/bindings/rtc/apple,smc-rtc.yaml F: Documentation/devicetree/bindings/spi/apple,spi.yaml F: Documentation/devicetree/bindings/spmi/apple,spmi.yaml F: Documentation/devicetree/bindings/watchdog/apple,wdt.yaml -- 2.51.2