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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 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: 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 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