From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A25A8606A319 for ; Tue, 20 Oct 2026 11:37:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=lists.infradead.org header.i=@lists.infradead.org header.a=rsa-sha256 header.s=bombadil.20210309 header.b=WUgmk3O9; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=WU/4G7zp DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:In-Reply-To:From:References:Cc:To:Subject:MIME-Version:Date: Message-ID:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; 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Tue, 20 Oct 2026 11:37:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1792496249; bh=sVGCrsIumhh2rykiYI3oYotV04vbs8GWIlWmVOoStJo=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=WU/4G7zpnaqjghzcAOdSwlv0am7CrxFwc/lFlbLZbnk3yDpJGmbe9Xecjn7+JyOpu BGZwtxAtS253mXdMUzICd2IQC3LBZs65pesnDnFppXjdkLrrbWOFqI9eYjYwY/cs3n IXcHws5PrDCq/OK7X0whk80EmBJlqmOx9RxMtLn8o4B+oKi4l9BrMPQZRJuA2T5loC rNf3M6/+QFwunTOi+iQGppaHIOIdQI32rrppEE5P4BC4sDMWg1rznYiMIBPnhkS+g8 KOhSvlDl0zUw5CCH3XRK25e+ZmJr1i+mqWpkhP0Rd4DFtBTYTYMIrDvoTNgLMqQVZO +ld0AktKd845w== Message-ID: <6e2d6ae5-20de-4f6d-9403-fbd2f65b5371@kernel.org> Date: Tue, 20 Oct 2026 13:37:06 +0200 X-Archived-By: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH RFC 2/5] dt-bindings: soc: Describe the BCM6846 Processor Monitor Bus To: Linus Walleij Cc: Lee Jones , Rob Herring , Krzysztof Kozlowski , Conor Dooley , William Zhang , Anand Gore , Kursad Oney , Florian Fainelli , =?UTF-8?B?UmFmYcWCIE1pxYJlY2tp?= , Broadcom internal kernel review list , Philipp Zabel , mfd@lists.linux.dev, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org References: <20261014-xg6846b-bcmbca-xrdp-reset-v1-0-daf5d177e113@kernel.org> <20261014-xg6846b-bcmbca-xrdp-reset-v1-2-daf5d177e113@kernel.org> <9ee8a8f1-5e32-4ecc-80dd-027f0424fda4@kernel.org> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" X-Spam-Status: No, score=-7.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 On 19/10/2026 16:03, Linus Walleij wrote: > On Fri, Oct 16, 2026 at 4:20 PM Krzysztof Kozlowski wrote: > >>> + /* Called PMB Processor Monitor Bus in vendor tree */ >>> + bus@ffb20100 { >>> + compatible = "brcm,bcm6846-pmb"; >>> + reg = <0xffb20100 0x200>; >>> + >>> + reset-controller { >>> + compatible = "brcm,bcm6846-pmb-reset"; >>> + #reset-cells = <1>; >> >> Anyway this tells - no resources here. This must be part of the parent >> node, not a separate device. > > It so happens that this bus (PMB) has several children just not defined > in this series. (thermal, clocks, power domains). > > One of the children is the thermal monitor, which in turn is using a > reset from the reset-controller node, to reset just that hardware > which is under the PMB. > > At this point if we put both #reset-cells and #thernal-sensor-cells > in the same PMB root node, the reset resource would come from > one part of the PMB to another part. This would not be a problem but hint that these are the same device and we try not to encode device internals in DT, at least for simple devices. > > They really are different devices under PMB bus, but I'll just go > and implement thermal sensing in the same patch series so > that it becomes obvious what is going on, why not. If they are different devices then it is fine. Usually people cannot actually distinguish different devices and they represent driver model in DT. Bindings are also supposed to be complete, which then avoids such questions/comments as mine. Commit msg or binding description should clarify such points. Best regards, Krzysztof