From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 099ED474245; Fri, 2 Oct 2026 09:39:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790933961; cv=none; b=hKRieSfbFG9EvOp310pBCWXmP4yuittOnsk3kzW0tDuYXdatxvJnRginJuHtcAZNLvq8d86MOfbLqIwn1FgsONzc8mM/2npPELutxP2jBHrbV+SmOVy6V1sym0Zf7UmjK5emxZhsr861tucJnNt8aVNG3n3SllkAC4t2j6kSZ2Q= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790933961; c=relaxed/simple; bh=hA1zeAk4wxpxXGX4kPhV20Ts9tikCfkkYTnQNM8EwqM=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=ozgvn3OL9UYL6orJPnPqpvVqT6rP32kEiP4Dppmb9U1B3gb1uI4bqA7R7KudO1PnNdtEIySkRYPMW48MiwfFzLVRP8rV6Nru9oupTLGWd2agGiPN0FJSQbuNK0eDLTz0KFn1DT8GVTw+p87XoxVVlue5OQYxy6EX2lDMghHse6Y= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Trs8e8WE; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Trs8e8WE" Received: by smtp.kernel.org (Postfix) with ESMTPSA id F06C91F000FF; Fri, 2 Oct 2026 09:39:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1790933959; bh=fjj+f5ijhUmhJthBkgxDWQqiZjrQVyrTMW5I1jLfkXY=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=Trs8e8WE4T7ghZ6J2kcvRzDd0DVCDTPX6L68v8d5dXlAwzAWeMXWbzzq8jBLz0R0u vw9YwyWOV1syIYezd4ixmTAeQQcPPj3Ub6H1lE0BT5jL/aktfvL9Jm0G3fol5pZa7R tONxMxHzUdbCoUGXmYvCZgD9IY6hQA07u3wk6+Qoq34z2Xl5jcGinVkblKveXL96BZ YdqZooGF1WY+jhnpfQehYlyhMxfZBydrAJv1a8FBkdtfIHiZu2g++MRKnWLqCYJcIg Ujtya90RKbBwlZmO8VXKhBAYvjbduRxIkFQRlVNOXXpYEkF+Evv8yb2+TPa7NOu+XV wFxHrH1SO5bPg== Message-ID: <7a66abc8-3b9a-4a9d-a094-e47e3588091a@kernel.org> Date: Fri, 2 Oct 2026 11:39:11 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 2/6] dt-bindings: arm: keystone: ti,sci: Add ti,tda54-sci-pdm compatible To: "Padhi, Beleswar" Cc: nm@ti.com, kristo@kernel.org, ssantosh@kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, afd@ti.com, u-kumar1@ti.com, vigneshr@ti.com, Rob Herring , Krzysztof Kozlowski , Conor Dooley , devicetree@vger.kernel.org References: <20260930194131.117129-1-b-padhi@ti.com> <20260930194131.117129-3-b-padhi@ti.com> <20261002-observant-prudent-booby-eac28e@quoll> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 02/10/2026 11:30, Padhi, Beleswar wrote: > > On 10/2/2026 12:01 PM, Krzysztof Kozlowski wrote: >> On Thu, Oct 01, 2026 at 01:11:27AM +0530, Beleswar Padhi wrote: >>> The previous TI K2G and K3 architectures were tightly coupled systems in >>> terms of Safety and Security. All the TI-SCI messages from HLOS (Linux) >>> were sent to a single sec proxy thread terminating at the core running >>> Safety service (DM). In K2G systems, DM handled both Safety & Security >>> requests by itself. Whereas in K3 systems, DM serviced the Safety >>> requests itself, and forwarded the Security requests to core running >>> Security service (TIFS) on the HLOS's behalf. This posed various >>> limitations: >>> a. Increased latency: An extra forwarding hop through DM adds latency >>> in requests and responses. >>> b. Freedom From Interference (FFI) concerns: Having Safety service >>> proxy Security's requests (& vice versa) undermines the isolation >>> and FFI of the system. >>> c. Potential Deadlock Scenario: Forwarding messages between Safety >>> and Security cores can result in a deadlock if there are circular >>> dependencies. >>> >>> To eliminate all the above limitations, the TI TDA54 class of SoCs >>> introduce an architectural change: Isolation of Security and Safety >>> services. To realize this enhanced isolation in hardware, two >>> independent sec proxy threads are now provided for HLOS to communicate >>> separately with the Security and Safety cores respectively. And the >>> TI-SCI message forwarding has been eliminated in Software. The System >>> Firmware ABI5.0 version necessitates this improved isolation and FFI >>> change. >> I don't get at all how above description helps to understand this patch >> and this new compatible, except that this is not compatible with old >> variants. > > > You just answered your own question. > >> So 30 lines of text instead of 3? > > > The existing system controllers have been compatible in all TI SoCs > for over 10+ years since Keystone generations. Using 30 lines of > text to explain "why" the new system controller is not compatible > with old variants is worth it. If you decide to spam us with a lot of description, including marketing crap ("To realize this enhanced isolation in hardware", "this improved isolation") instead of writing concise and precise messages, accept the outcome of maintainers choosing to allocate their time in "improved way". Best regards, Krzysztof