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 D849FEF06E2 for ; Sun, 8 Feb 2026 10:37:06 +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=JkPin0ayRbWV2bcMnyTq8ACbHp5CZQECHoTkeUwS6Lc=; b=afHgqm3JqsSQab6mmeftu4L8nR tfwiaGzTVBEq6Zm+AcYvcJExmTeoEE4LdsGmn4JRkaFWRCYsowcOGmwgdNInCmaBD1z8vhAHyiRDR AEQu14ZX6Xqw7I7vU5p5WoUroi64N+4IK8F94f9XTYDCTEYdvc3vFVZ6Ac2EuKnRIsNDCcnBDEfiR 5+hkX2q1Kt6kW0mzFNzPPTXIvy8dcdRes0kJNoSfqy2flMhLyi3Pks85EsnAl+3tK/SThblJ1OTIj FI+KOU+7U7VGS/Ef2HmZY3np44qn4lA8VBGO27c8wPLv/Fe8exykbxA8vrk855KoIJatTZxvYJ8uw I4QxQbrg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vp29z-0000000DER0-3ktQ; Sun, 08 Feb 2026 10:36:59 +0000 Received: from tor.source.kernel.org ([172.105.4.254]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1vp29x-0000000DEQs-3GXt for linux-arm-kernel@lists.infradead.org; Sun, 08 Feb 2026 10:36:58 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id D91AC60054; Sun, 8 Feb 2026 10:36:56 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id CA43AC4CEF7; Sun, 8 Feb 2026 10:36:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1770547016; bh=ZJcNQC83teh7+Vsu+y7dgbRiRrWJD7su7SWlEPJlW1M=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=XyOb958dXTZfuEfbYtFB67DGgAvKYnFxNTUpXJ5cXTe4FROOCAA10L/6g9QQCDPeS UVgL5PPSTuQ1Sz+vJXaCAn0vZrISkIArThW+IsV+nTwWgDJVie63a6PSBw8x63QMZK pEwxYJEcSN5tqIIM/XZZWKN2kcjasw9ZhMyGJyyTmW0pBMmBh6WxaVMKPLkm13Icgk J9jCUEDAcV9z/rAmon3e1hQhJshqUUrTOr83uDlr0FPMppFo369wAljb9p+YvcfW4K NT50YceUpUTAel0mHUJGS2T9XNytu8o379k7AnUPlIk/mGHVhhAMiqijOYKO05dwfi FIbVo9IEltAkA== Message-ID: Date: Sun, 8 Feb 2026 11:36:51 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] dt-bindings: mailbox: xlnx,zynqmp-ipi-mailbox: Document msg region requirement To: "T, Harini" Cc: "jassisinghbrar@gmail.com" , "robh@kernel.org" , "krzk+dt@kernel.org" , "conor+dt@kernel.org" , "Simek, Michal" , "Datta, Shubhrajyoti" , "linux-kernel@vger.kernel.org" , "devicetree@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "git (AMD-Xilinx)" References: <20251222044653.1757886-1-harini.t@amd.com> <20251222-funny-aspiring-seal-05c4ae@quoll> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit 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 23/12/2025 11:48, T, Harini wrote: > [Public] What? Fix your email client, so we wan't be dealing with your corporate rules. [Private] or rather let's mess with corporate systems: [Confidential] > > Hi, > >> -----Original Message----- >> From: Krzysztof Kozlowski >> Sent: Monday, December 22, 2025 2:39 PM >> To: T, Harini >> Cc: jassisinghbrar@gmail.com; robh@kernel.org; krzk+dt@kernel.org; >> conor+dt@kernel.org; Simek, Michal ; Datta, >> Shubhrajyoti ; linux-kernel@vger.kernel.org; >> devicetree@vger.kernel.org; linux-arm-kernel@lists.infradead.org; git (AMD- >> Xilinx) >> Subject: Re: [PATCH] dt-bindings: mailbox: xlnx,zynqmp-ipi-mailbox: >> Document msg region requirement >> >> Caution: This message originated from an External Source. Use proper caution >> when opening attachments, clicking links, or responding. >> >> >> On Mon, Dec 22, 2025 at 10:16:53AM +0530, Harini T wrote: >>> Add description clarifying that for Versal IPI mailboxes, both host >>> and remote agents must have the "msg" register region defined for >>> successful message passing. Without both, only notification-based >>> communication works. >>> >>> Signed-off-by: Harini T >>> --- >>> .../bindings/mailbox/xlnx,zynqmp-ipi-mailbox.yaml | 6 ++++++ >>> 1 file changed, 6 insertions(+) >>> >>> diff --git >>> a/Documentation/devicetree/bindings/mailbox/xlnx,zynqmp-ipi-mailbox.ya >>> ml >>> b/Documentation/devicetree/bindings/mailbox/xlnx,zynqmp-ipi-mailbox.ya >>> ml index 04d6473d666f..8fdf77c7935c 100644 >>> --- >>> a/Documentation/devicetree/bindings/mailbox/xlnx,zynqmp-ipi-mailbox.ya >>> ml >>> +++ b/Documentation/devicetree/bindings/mailbox/xlnx,zynqmp-ipi-mailbo >>> +++ x.yaml >>> @@ -165,6 +165,12 @@ allOf: >>> reg-names: false >>> >>> else: >>> + description: >> >> Else block cannot have description. > > Can I remove the description from else block and move the clarifying text to the top-level description field? > >> >>> + For Versal IPI mailboxes, the "msg" register region is optional. >> >> So it is optional... > > The schema marks "msg" as optional to support both notification-only and message-passing use-cases. In hardware, some mailbox channels may be designed for notification only (no buffer), while others support full message passing (with buffer). The schema allows both, but for message passing, "msg" is required on both ends This is not wrapped. Again, fix your email client. > >> >>> + However, for successful message passing via mailbox, both the >>> + host IPI >> >> And it is not optional. If nothing works, then it is not optional. >> >> And why would it be optional in the first place? You generate your same IP >> with different settings? > > There are 2 types of IPI channels (Buffered and Buffer-less) > Some IPI channels are used only for notification (no message buffer, so "msg" is omitted). Confusing description then. > Best regards, Krzysztof