From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 209C6246333; Thu, 30 Oct 2025 05:55:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761803722; cv=none; b=dXgeDN7TQ7RzEaMG71LHYbdwKlJ2iySASlUTcEdn/8c8BuKJ7EPyu4Z3MvkwfQGOKXcyE/cSQhYBaL5/rbl8sLNhVk7gQww9+Ytpg90+c/noNYoSdFxFcvGVqclinFtp2jsKbAatrz58fNV5+aU08OTZXOcu2s/O7qDXW1saTc8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761803722; c=relaxed/simple; bh=kmYiPgQoz2pXEhJOd4VNiPMnOXp/QqwNqMVfMuxjpbg=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=P/5OC+Gv61kNvKzlS9+nI2GPTMiwVqxMqXwC7XHQHLlMqW8bzMSd/RGZx0Fo1z7OlLKyadT5u1JU5o3AvJrdxsaroAskRUkbYy+dixt++BIG/u2+dB+jQ/+DU9T2SEWwfNrGC2FkqVtXXI7guB6xCXigae/smWugGWUDuBqEZGU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=MrKptVlO; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="MrKptVlO" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A444DC4CEF1; Thu, 30 Oct 2025 05:55:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1761803721; bh=kmYiPgQoz2pXEhJOd4VNiPMnOXp/QqwNqMVfMuxjpbg=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=MrKptVlOSM6ipxPDG73JLsVaDrZNYXdZh3oH9ZT8e8YVndpOujK/rdakmp9hXTb6w g76twl4dntIzo5YqTTsY6EFzsqtr1GFh2JxEZimADJjHUdXtpmeX17JT/1IQNuHASe M+I7UXLa2EkkLSWM3g7FHpanFdjXxjvZgnqx+tC4DrsJywwW1cdfYPOYnPyAml5bb5 nfXdoO28CfC+hhGesfpRj/O6QFaCQAKLnNV3t4QKDHr7GWIMAC0iJjoa3ZF8B4JBGe Ph17AebxCMsYpRpxou9GOQ+DhgzlavrX0OrI9L16RaDqBBM4c4XOoa9f9rgsD2BOS+ DwY7JtqRN1LNg== Message-ID: Date: Thu, 30 Oct 2025 06:55:16 +0100 Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 1/2] dt-bindings: mailbox: qcom: Add IPCC support for Kaanapali Platform To: Bjorn Andersson Cc: Jingyi Wang , Manivannan Sadhasivam , Jassi Brar , Rob Herring , Krzysztof Kozlowski , Conor Dooley , aiqun.yu@oss.qualcomm.com, tingwei.zhang@oss.qualcomm.com, trilok.soni@oss.qualcomm.com, yijie.yang@oss.qualcomm.com, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org References: <20251029-knp-ipcc-v2-0-8ba303ab82de@oss.qualcomm.com> <20251029-knp-ipcc-v2-1-8ba303ab82de@oss.qualcomm.com> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 29/10/2025 17:15, Bjorn Andersson wrote: > On Wed, Oct 29, 2025 at 04:47:17PM +0100, Krzysztof Kozlowski wrote: >> On 29/10/2025 16:16, Bjorn Andersson wrote: >>> On Wed, Oct 29, 2025 at 01:15:09AM -0700, Jingyi Wang wrote: >>>> Add the physical client ids and binding for Kaanapali platform. Physical >>>> client IDs instead of virtual client IDs are used for qcom new platforms >>>> in the Inter Process Communication Controller (IPCC) driver as virtual to >>>> physical mapping logic is removed in HW. >>> >>> Happy to see the description of what changed wrt physical vs virtual >>> client IDs, but you're leaving the task of figuring out how this >>> explanation is applicable to the imagination of the reader. >>> >>> Nobody knows that the values in dt-bindings/mailbox/qcom-ipcc.h are >>> "virtual client IDs", so it's not clear that you're trying to provide an >>> explanation to why a new, platform-specific, header file is needed here. >>> >>> >> >> >> Physical or virtual, standard expectation is that they are used by the >> driver. This does not happen here, so what do they exactly represent? >> Which part of SW ABI? >> > > I was under the impression that they would be used only in DeviceTree > source, and the driver simply uses the values it reads at runtime. And uses them for what? What do the values mean for the driver, how does it use them? If I change some entry from "1" to "2" does Linux code behave differently? Best regards, Krzysztof