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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 781B6CCD1BF for ; Thu, 23 Oct 2025 13:42:22 +0000 (UTC) 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; bh=liOfj+w7oQQHQDinbActumCxZ7ts8b1PR9+ClEG2E04=; b=EZd3jIPEhyHhvEbZbp4KGLE22T 1nkm8fz3GEgko8M/KgzC8cs/YmNlzWkhP100BK0gi+3rCBZHODXBTxLyYgoFP0jJp2bwhRP8b31L4 LHGaI5zDlOt8g8mi6Q2sK5FvkroWjACCjD+oElPBxg2FlaDgnFQsc2xgpo86tDbym2JgqAqGH4TtH yndi3dY3VIsw0ZCTyrRYLufoPaWr5zUgcGxUd8eqAmALKikfBOBidhIqJpVfZaE244g2IAM5Lgl2c eS7rQtyhlV/IRX5WKWpLhxkDWkErKE/S15WccHVt7JfvWUWIzORIcfRHRcVf7antils/pj1BTQ7Wr rEHtNV4w==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vBva1-00000006S0y-1ZCV; Thu, 23 Oct 2025 13:42:13 +0000 Received: from mout-p-103.mailbox.org ([80.241.56.161]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1vBvZz-00000006S0S-0TOb for linux-arm-kernel@lists.infradead.org; Thu, 23 Oct 2025 13:42:12 +0000 Received: from smtp2.mailbox.org (smtp2.mailbox.org [10.196.197.2]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by mout-p-103.mailbox.org (Postfix) with ESMTPS id 4csnJc1Cmgz9slM; Thu, 23 Oct 2025 15:42:08 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mailbox.org; s=mail20150812; t=1761226928; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=liOfj+w7oQQHQDinbActumCxZ7ts8b1PR9+ClEG2E04=; b=o9+wlKtp+2kDP0Zbjrkwnbw8gWzh21UrNc2ucsM9ov4omiyPctnbOnoSsjI0i/mc93P2K7 Fotzk1NrnxIas6RJz6KAKgbKUfVWbPN2RXt91urKFmxXVDolED2nwYLqtussQQnOyjIl1/ gZ6dtn6k83cUX+d3j4SmOriLX4GMLtpgabRBkDQnvaD4jPXt5b8Qh8bbGcnXQRKkeEtt0X tYJYT17NeaBBxiVEQhMJyl4L74bfRJzjQRDGyy6wGqYbYXRdpkR55ER3cz38+1PpCEB9BT hOm4II+4u95AUPJQztPhy0q076I/ktLAtnSXS4BCudy4m5+pBjZ6i1w+W8rSrg== Message-ID: <066449c8-4bca-41f1-990e-53d7672e3c0a@mailbox.org> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mailbox.org; s=mail20150812; t=1761226926; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=liOfj+w7oQQHQDinbActumCxZ7ts8b1PR9+ClEG2E04=; b=AV+NJSsTsrmJu2xpIi8b3X4WAqCpmXBK6i7v/WDnXuzr7Gg4IKoUADsAAhOCN4rWt9UrIq aeIBV4emYzweIn7+H16S3dLe1TyA6HXoLfuffCUu5mSSIxvgbF12gIx5X0pE24bwHuHrZ3 q4kaZTEt9S8/VybcH7XmQJRr9P0T3j/SDO8b/yKUll37QKvLoe4hfBUXwv0IXur9Rbmc5m SQVLqGyGyAT8OrUEvdENH4xHFWg0vAITTgU/Mb7kOtQ6jQtTi0pLaVcIcg/7N884H9ULy0 VGLaHH+WAMlmevcfutwJh3GqNKUgogPGfisdha+YbyBdXzJ2s5SSPuCoLtIUBw== Date: Thu, 23 Oct 2025 15:42:02 +0200 MIME-Version: 1.0 Subject: Re: [PATCH 1/2] dt-bindings: firmware: arm,scmi: Document arm,poll-transport property To: Sudeep Holla , Marek Vasut Cc: arm-scmi@vger.kernel.org, Conor Dooley , Cristian Marussi , Florian Fainelli , Krzysztof Kozlowski , Rob Herring , devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-renesas-soc@vger.kernel.org References: <20251023123644.8730-1-marek.vasut+renesas@mailbox.org> <20251023-able-fervent-tortoise-e7a6df@sudeepholla> Content-Language: en-US From: Marek Vasut In-Reply-To: <20251023-able-fervent-tortoise-e7a6df@sudeepholla> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-MBO-RS-ID: 2b7b03ec44f958831f6 X-MBO-RS-META: d7cbac4yirg6dmrd4f7ehr3mnryd66c3 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251023_064211_295367_2A50CA02 X-CRM114-Status: GOOD ( 12.87 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 10/23/25 3:16 PM, Sudeep Holla wrote: Hello Sudeep, >> + arm,poll-transport: >> + type: boolean >> + description: >> + An optional property which unconditionally forces polling in all transports. >> + This is mainly mean to work around uncooperative SCP, which does not generate >> + completion interrupts. >> + > > Could you please clarify which platform and transport this change pertains to? Renesas X5H with older SCP firmware , accessible via mailbox. > Introducing a property that enforces unconditional polling across all > platforms is not ideal - particularly if this is intended as a workaround > for a platform- or firmware- specific issue. Such implementations often get > replicated across platforms without addressing the root cause, leading to > wider inconsistencies. The root cause is being addressed already, this is meant to keep the older SCP version operable. > It would be preferable to scope this behavior using the platform’s compatible > string. This approach ensures the workaround is applied only to the affected > platform and prevents it from being inadvertently enabled elsewhere, unless > another platform intentionally uses the same compatible string (which seems > unlikely). This is not platform-specific issue. SCMI provider which fails to generate interrupts can appear on any platform, using either transport, that is why I made the property generic. -- Best regards, Marek Vasut