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 D09B3ECAAD3 for ; Sat, 10 Sep 2022 14:41:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Subject:Cc:To:From:Message-ID:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=pzOV1iHSFhrMoxXpjOZRJitN38ZrnlsDRzGZbT54j0M=; b=Qbla7KppTaiID9 KzIuJkbXuSWiY5S9mfUENhOPVNYLL5id140ILquMIGpYlr8mAk9UhzxiylwvDcxUnXV3d+qYamn+2 42A4MEOAIiW/FXO2RDpNTsH1Ef3tzVcn1LnOW/fP780JJ85SK3EnyP4l4/WQJ+MZbymeN4i/r5vx7 HbpocKyx/LBGHH+AcITMoT2bxW8T8mUy5c93vX02J8AhNkKiwPGRuU6MWXXDDkWT1h+o5icIaVYRa 7aaWHdlS6wYq9Dc/spP2OB0Y0NH81HtYhu1TDqFdhPU1nkbgGxWzpxXMXJ0drbbmP64ZzboVP5oAj WYcP0I9OgRgrfL+366yg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1oX1fC-00Atec-UB; Sat, 10 Sep 2022 14:40:55 +0000 Received: from ams.source.kernel.org ([2604:1380:4601:e00::1]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1oX1et-00AtaF-9I for linux-arm-kernel@lists.infradead.org; Sat, 10 Sep 2022 14:40:36 +0000 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 1A351B80A39; Sat, 10 Sep 2022 14:40:33 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id C71C9C433D6; Sat, 10 Sep 2022 14:40:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1662820831; bh=yoLyrhPTFTvBgeQMrdTZ1aOP2pxInq6DJu6Ae8eysg0=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=kdpA6DJoqSDG8On3+fYzAcvlQQH2ovwvFFRtWCSP4W+O8kTwr3A9aTM2+JjrMoL2t qECi7WfNNOgG7gv4KzTvbJgFCg8xD25AOdw7O79YuHJWT9yods0zdEVcL5ZgHO1CB5 To2sUNaMW9MHLarY7xtVShKufm1NFFNTa4y+rMMRxzWfOXNx2mrJtOCiCrpMaTSQZT BnuFtfNkYD2aJOVZNBH59LcJ9b/9ZHl+FNzTH1Y3JBcywMKeCnZHmFJ8zfcYxsTw/k N618MBrj+mCMUMBKRZTgStS6O7Kbh0zMLMFzKjdILtXldKY2iMPJ32j/ghIMew+MF7 o8rmoprpbiWlw== Received: from sofa.misterjones.org ([185.219.108.64] helo=wait-a-minute.misterjones.org) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.95) (envelope-from ) id 1oX1en-009Pak-He; Sat, 10 Sep 2022 15:40:29 +0100 Date: Sat, 10 Sep 2022 15:40:29 +0100 Message-ID: <87wnabpa1u.wl-maz@kernel.org> From: Marc Zyngier To: Frank Li Cc: "tglx@linutronix.de" , "robh+dt@kernel.org" , "krzysztof.kozlowski+dt@linaro.org" , "shawnguo@kernel.org" , "s.hauer@pengutronix.de" , "kw@linux.com" , "bhelgaas@google.com" , "linux-kernel@vger.kernel.org" , "devicetree@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "linux-pci@vger.kernel.org" , Peng Fan , Aisheng Dong , "jdmason@kudzu.us" , "kernel@pengutronix.de" , "festevam@gmail.com" , dl-linux-imx , "kishon@ti.com" , "lorenzo.pieralisi@arm.com" , "ntb@lists.linux.dev" , "lznuaa@gmail.com" , "imx@lists.linux.dev" , "manivannan.sadhasivam@linaro.org" Subject: Re: [EXT] Re: [PATCH v9 2/4] irqchip: Add IMX MU MSI controller driver In-Reply-To: References: <20220907034856.3101570-1-Frank.Li@nxp.com> <20220907034856.3101570-3-Frank.Li@nxp.com> <87fsh2qpq4.wl-maz@kernel.org> User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue) FLIM-LB/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL-LB/10.8 EasyPG/1.0.0 Emacs/27.1 (x86_64-pc-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: frank.li@nxp.com, tglx@linutronix.de, robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, shawnguo@kernel.org, s.hauer@pengutronix.de, kw@linux.com, bhelgaas@google.com, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-pci@vger.kernel.org, peng.fan@nxp.com, aisheng.dong@nxp.com, jdmason@kudzu.us, kernel@pengutronix.de, festevam@gmail.com, linux-imx@nxp.com, kishon@ti.com, lorenzo.pieralisi@arm.com, ntb@lists.linux.dev, lznuaa@gmail.com, imx@lists.linux.dev, manivannan.sadhasivam@linaro.org X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220910_074035_630859_5ED77BDF X-CRM114-Status: GOOD ( 18.63 ) 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: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, 09 Sep 2022 15:52:45 +0100, Frank Li wrote: > > > > + select IRQ_DOMAIN > > > + select IRQ_DOMAIN_HIERARCHY > > > + select GENERIC_MSI_IRQ_DOMAIN > > > + help > > > + MU work as MSI controller to do general doorbell > > > > I'm not sure this is that generic. It really is limited to CPU-to-CPU > > interrupts. > > [Frank Li] I think the only limitation is only 4 irq numbers. > The principle CPU to CPU irq is the same as MSI. Not quite. Normal MSIs are device-to-CPU. CPU-to-CPU are normally IPIs, and this one falls in the middle. > What's your preferred help description? Provide a driver for the MU block used as a CPU-to-CPU MSI controller. This requires a specially crafted DT to make use of this driver. If unsure, say N. M. -- Without deviation from the norm, progress is not possible. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel