From patchwork Fri May 31 14:33:17 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sudeep Holla X-Patchwork-Id: 10970343 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 09501933 for ; Fri, 31 May 2019 14:34:28 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id EC13728A4F for ; Fri, 31 May 2019 14:34:27 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id DFEC628AD0; Fri, 31 May 2019 14:34:27 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 465FC28A6B for ; Fri, 31 May 2019 14:34:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:References: In-Reply-To:Message-Id:Date:Subject:To:From:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=bwrsxwvEQ/09QK+X840s3ocaPmXNqyZV2Xr2JDJ3YJ8=; b=lhGQoD9x4NNBI0tT8QjRtDfs6+ 59Go76xxfVMAhKeXrWdiSLd715dLuVpjoCnvD3eGHj8nSZXL8X31+wweJOMFLmijyeKjqxw3RjMa8 HsWmouPQBQvngbnhyCEg0UdXcELgcq4yQeCbMSs525IGLjjxVREs0zkWcEXSmYk+fHwexTJdb6KhZ 23SX2NELp0bqUb7qlF50yedFftRg8PgfLCp5O5M9R7ObsDD0X/5FozFfluznJxPvsz+75czBLuu4A pUjm75MG+Rp3MIhGZZpfuvT+HRK8TBK+Lm0CJpcvSe7ay6h0YuttUyTTlZ0Ky3txNT2lbX7PY+c7W g1cDiPpg==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1hWibt-0007o4-64; Fri, 31 May 2019 14:34:21 +0000 Received: from foss.arm.com ([217.140.101.70]) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1hWibG-000737-R9 for linux-arm-kernel@lists.infradead.org; Fri, 31 May 2019 14:33:45 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 8FD911684; Fri, 31 May 2019 07:33:42 -0700 (PDT) Received: from usa.arm.com (e107155-lin.cambridge.arm.com [10.1.196.42]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 9FB433F5AF; Fri, 31 May 2019 07:33:40 -0700 (PDT) From: Sudeep Holla To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Jassi Brar , Arnd Bergmann Subject: [PATCH 3/6] dt-bindings: mailbox: add bindings to support ARM MHU doorbells Date: Fri, 31 May 2019 15:33:17 +0100 Message-Id: <20190531143320.8895-4-sudeep.holla@arm.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190531143320.8895-1-sudeep.holla@arm.com> References: <20190531143320.8895-1-sudeep.holla@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190531_073342_916513_57B8E3DD X-CRM114-Status: GOOD ( 17.01 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, Rob Herring , Bjorn Andersson , Jassi Brar , Mark Brown , Sudeep Holla , Cristian Marussi MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP The ARM MHU has mechanism to assert interrupt signals to facilitate inter-processor message based communication. It drives the signal using a 32-bit register, with all 32-bits logically ORed together. It also enables software to set, clear and check the status of each of the bits of this register independently. Each bit of the register can be associated with a type of event that can contribute to raising the interrupt thereby allowing it to be used as independent doorbells. Since the first version of this binding can't support doorbells, this patch extends the existing binding to support them by allowing "#mbox-cells" to be 2. Cc: Jassi Brar Cc: Rob Herring Cc: devicetree@vger.kernel.org Signed-off-by: Sudeep Holla --- .../devicetree/bindings/mailbox/arm-mhu.txt | 39 ++++++++++++++++++- 1 file changed, 37 insertions(+), 2 deletions(-) diff --git a/Documentation/devicetree/bindings/mailbox/arm-mhu.txt b/Documentation/devicetree/bindings/mailbox/arm-mhu.txt index 4971f03f0b33..ba659bcc7109 100644 --- a/Documentation/devicetree/bindings/mailbox/arm-mhu.txt +++ b/Documentation/devicetree/bindings/mailbox/arm-mhu.txt @@ -10,6 +10,15 @@ STAT register and the remote clears it after having read the data. The last channel is specified to be a 'Secure' resource, hence can't be used by Linux running NS. +The MHU drives the interrupt signal using a 32-bit register, with all +32-bits logically ORed together. It provides a set of registers to +enable software to set, clear and check the status of each of the bits +of this register independently. The use of 32 bits per interrupt line +enables software to provide more information about the source of the +interrupt. For example, each bit of the register can be associated with +a type of event that can contribute to raising the interrupt. Each of +the 32-bits can be used as "doorbell" to alert the remote processor. + Mailbox Device Node: ==================== @@ -18,13 +27,21 @@ used by Linux running NS. - compatible: Shall be "arm,mhu" & "arm,primecell" - reg: Contains the mailbox register address range (base address and length) -- #mbox-cells Shall be 1 - the index of the channel needed. +- #mbox-cells Shall be 1 - the index of the channel needed when + not used as set of doorbell bits. + Shall be 2 - the index of the channel needed, and + the index of the doorbell bit within the channel + when used in doorbell mode. - interrupts: Contains the interrupt information corresponding to - each of the 3 links of MHU. + each of the 3 physical channels of MHU namely low + priority non-secure, high priority non-secure and + secure channels. Example: -------- +1. Controller which doesn't support doorbells + mhu: mailbox@2b1f0000 { #mbox-cells = <1>; compatible = "arm,mhu", "arm,primecell"; @@ -41,3 +58,21 @@ used by Linux running NS. reg = <0 0x2e000000 0x4000>; mboxes = <&mhu 1>; /* HP-NonSecure */ }; + +2. Controller which supports doorbells + + mhu: mailbox@2b1f0000 { + #mbox-cells = <2>; + compatible = "arm,mhu", "arm,primecell"; + reg = <0 0x2b1f0000 0x1000>; + interrupts = <0 36 4>, /* LP-NonSecure */ + <0 35 4>; /* HP-NonSecure */ + clocks = <&clock 0 2 1>; + clock-names = "apb_pclk"; + }; + + mhu_client: scb@2e000000 { + compatible = "arm,scpi"; + reg = <0 0x2e000000 0x200>; + mboxes = <&mhu 1 4>; /* HP-NonSecure 5th doorbell bit */ + };