From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 C347D399352; Thu, 10 Sep 2026 07:08:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789024131; cv=none; b=d4q8iKffhJJtu+zrO1mFU5wnPKnAyXDpE3O/3EbWF19NcFDZbXwIk5EvSPf1MHx46CTtEkj3JjEwjQgPE7HABkD6kvqzckoabdlvTD9HnaJqfaP9hsGGaudXW0NNXrHKZjftb0eu/NDj7KBI7JRv1hK5jyGkK8mojboj3JPX5WU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789024131; c=relaxed/simple; bh=84XklZDqCadcFYTuu9xAS7nr1fwKozlO+iA/y46y3fM=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=c+2iWBISSJz+EE3cIGWdC00fSLY3Lw7ydCPY5+0t+dOrksK4Kv76vjwe6VsOKj5+7ciD6ndPM+e7NzMycIi39S3Ho3HYEp+Oidz3lvUzaPvJuMZHQwcBSh8peogKA7MyEVXzRnrEl5Yb9X4QtYY5FVEkbN/icBmiHZnsYeSq5xw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Kn3TV6sH; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Kn3TV6sH" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2F1BA1F000FF; Thu, 10 Sep 2026 07:08:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1789024129; bh=1iAtv2unCZuRSKay79DiZYrgZPynv4zWBTNGjY3xYd4=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=Kn3TV6sHwqFYbruJ8kjg0KQ90hYJiR7ApbX5/uTVmWQVCxD4jgO2hzofkmI293v0J /w7gW8SwP71ls7Pq5d49C2Lm5/wMiKGS77D7/2It38k9A3zgKAJ5LM6SBjr1cRgGrF 6KZuweQ/5IwsbrpaUuFw0BlTbi74C5ImDwtuqTDlv8HNNRhrOFZhoQVYCW1o5CgAnj 9m4Z7QB2bukAA5WzHv2ab00T2DSL4B64L956do+bX37b/JcX68C9i0DcukbJGqVnn1 8lBjhWwJ1h/pINv5ODNcmLGjiK0GpS4XbJtdXkSa2/YvcQh6XGl89teHXhAYUMFCe0 hXx7tiZHnLcUg== Message-ID: <718e88b8-3f3b-410e-8e76-90c370ff920a@kernel.org> Date: Thu, 10 Sep 2026 09:08:41 +0200 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/3] dt-bindings: rtc: Add Raspberry Pi 5 RTC binding To: Sander Speetjens Cc: Alexandre Belloni , 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 References: <20260909141300.1368790-1-sander.speetjens@gmail.com> <20260909141300.1368790-2-sander.speetjens@gmail.com> <4c237cd8-024f-405e-a00e-e22ff9529d08@kernel.org> <8cd19ae8-372b-444b-bd2a-dc01221b5896@kernel.org> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 09/09/2026 22:24, Sander Speetjens wrote: > Thanks for your response > >> And more important, where is any interface to actually control the RTC? >> I see nothing, so your firmware is? Then this is not a separate device >> and you just added DTS for your driver, which is a no go (see writing >> bindings). > > The RTC is a physical, battery-backed RTC, but the Raspberry Pi firmware > exposes its register interface exclusively through the firmware mailbox. > I initially used a firmware phandle so the RTC driver could obtain the > existing rpi_firmware instance. > > Based on your comment, I think it is more appropriate to model > the RTC as a child device of rpi-firmware, > referencing to the existing firmware clock/reset/power services, > and have the driver obtain the firmware interface from its parent > rather than adding a phandle solely for driver plumbing. > Which also means moving this to arm/bcm/raspberrypi,bcm2835-firmware.yaml > Whether device has separate node, depends on it having dedicated resources. I don't see such here, so unlikely it should have a node in the first place (see writing bindings or DTS101 where exactly this question is asked). Best regards, Krzysztof