From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id ED33DCD6138 for ; Mon, 9 Oct 2023 21:04:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1378153AbjJIVEG (ORCPT ); Mon, 9 Oct 2023 17:04:06 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39824 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1378204AbjJIVDz (ORCPT ); Mon, 9 Oct 2023 17:03:55 -0400 Received: from mail-lj1-x231.google.com (mail-lj1-x231.google.com [IPv6:2a00:1450:4864:20::231]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 84021E9 for ; Mon, 9 Oct 2023 14:03:49 -0700 (PDT) Received: by mail-lj1-x231.google.com with SMTP id 38308e7fff4ca-2c00e1d4c08so63368411fa.3 for ; Mon, 09 Oct 2023 14:03:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1696885427; x=1697490227; darn=vger.kernel.org; h=content-transfer-encoding:in-reply-to:from:references:cc:to :content-language:subject:user-agent:mime-version:date:message-id :from:to:cc:subject:date:message-id:reply-to; bh=43JczQhR06svhP3+MFO67a4XDgSpc7xK7wWPqbVY3mc=; b=Tf09s6ZuTFQ61khnhibD7Law+sJmp194b8dKjNVEczJTXEhSz/iVrQ/og+vR7IueXD iPeRaN50OUwiiJwg3v5pn9mrFTc1IBPzFhe/41h9cogtoH64juBQPq7CPoMyd1ux+nfT TsvA3ttggXKCHyvvNk2XEnqpYC38TW8Jg0kOUB2zIw0sGUGwVUMnbMz/UohfBJQqT9Ua XwikSQjW3z7gF5C+sh5o18UHRX0BYYQRMSaXwMZybOf7wWaYhC8ejAYBrBm/BV5Pcgft 15l42CY0jrN8qqG5NVelUakkdT0BdfXGJxcpjPvuaRv2qKoRXShg27SwaHAv43H2ZeXJ Sw8w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1696885427; x=1697490227; h=content-transfer-encoding:in-reply-to:from:references:cc:to :content-language:subject:user-agent:mime-version:date:message-id :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=43JczQhR06svhP3+MFO67a4XDgSpc7xK7wWPqbVY3mc=; b=dWI5rNbxvNY9KgukMNUWaPcbiNrM+cAkffuC/6Mw3/irMdaA0eOStGl9Fl8/S8MeLw NowyaTpsP/BDac/aHY69ZycfB67aOkHtY2oGFbDi51O+YW6A+Jd72m7PsHkuUxnZFenu Sq4puORr6daCYOap8UTvvYZErw/spiSYTwmZoNPIfkV53GmpzYRbPjYeZGgoaxm2Xi7x Ad0wUv8vlFXGFQGIovkAKO8C68IgM2Ti0xexLGwrDZlwLRulKIRfTXYpFGhs7dxUL32r ZuDE9GfXsZD2rYIcMljiyWqBNXfJOdD9GkaPTUjQJOOE4sXhB5gXGT+xUhPiSjyFrQZh sVTQ== X-Gm-Message-State: AOJu0YymkymKr+5Uoxqglcsx18J2E8YAFsUfh8jVStvM72MzOqdBy8/W HFUZPsNlW8RLkhoc/AIXH3nDig== X-Google-Smtp-Source: AGHT+IFMY7QqUdgo8VEEaNfc3AJxOGVDc5LmcHQuYLgMIPjPJlsAadiflZalp6ZB8QmqLruGsgB5CQ== X-Received: by 2002:a05:651c:104:b0:2c0:240:b564 with SMTP id a4-20020a05651c010400b002c00240b564mr13779157ljb.15.1696885427576; Mon, 09 Oct 2023 14:03:47 -0700 (PDT) Received: from [172.30.204.90] (UNUSED.212-182-62-129.lubman.net.pl. [212.182.62.129]) by smtp.gmail.com with ESMTPSA id a19-20020a05651c011300b002bff365c7bfsm2155195ljb.35.2023.10.09.14.03.46 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 09 Oct 2023 14:03:47 -0700 (PDT) Message-ID: <0a039a5a-46c8-4f63-a9e4-fd5b197340ab@linaro.org> Date: Mon, 9 Oct 2023 23:03:45 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 1/2] dt-bindings: arm: Add new compatible for smc/hvc transport for SCMI Content-Language: en-US To: Nikunj Kela , Sudeep Holla Cc: cristian.marussi@arm.com, robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, conor+dt@kernel.org, andersson@kernel.org, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org References: <20230718160833.36397-1-quic_nkela@quicinc.com> <20231006164206.40710-1-quic_nkela@quicinc.com> <20231006164206.40710-2-quic_nkela@quicinc.com> <20231009144154.vfx5caqxtyezulxx@bogus> From: Konrad Dybcio In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 10/9/23 16:52, Nikunj Kela wrote: > > On 10/9/2023 7:41 AM, Sudeep Holla wrote: >> On Fri, Oct 06, 2023 at 09:42:05AM -0700, Nikunj Kela wrote: >>> Introduce compatible "qcom,scmi-smc" for SCMI smc/hvc transport >>> channel for >>> Qualcomm virtual platforms. >>> >>> This compatible mandates populating an additional parameter >>> 'capability-id' >>> from the last 8 bytes of the shmem channel. >>> >> While I am happy with the simplification here, I am also bit nervous how >> long before Qualcomm abandons this. I hope this is adopted as is in all >> internal and downstream code without any modifications and this is not >> just a push for upstreaming some change to minimise delta with internal/ >> downstream code. >> >> -- >> Regards, >> Sudeep > > Qualcomm is using patch on all the virtual auto platforms using > shmem/doorbell as scmi channel. This is already being used without any > modifications in our downstream code. No delta for this patch series. > Thanks! AFAICT Sudeep is looking for a solid guarantee that it will continue to be used as-is, on more than one platform and on more than one BSP version. There have been cases where such firmware interfaces had silent ABI breaks (or were replaced altogether) between qc downstream branches and this would be unacceptable. Understandably, having a unified means of communication for *all* Qualcomm chips (i.e. not only auto) going forward would likely be expected.. Konrad