From patchwork Thu Sep 28 13:11:25 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sudeep Holla X-Patchwork-Id: 114422 Delivered-To: patch@linaro.org Received: by 10.140.106.117 with SMTP id d108csp727237qgf; Thu, 28 Sep 2017 06:14:11 -0700 (PDT) X-Google-Smtp-Source: AOwi7QDysT3eD1K6XNSjMellizgJ8wGV9RIFZSCmZMlhgFfkmRexUW5uJuzsE/YzcOrnN221qvLf X-Received: by 10.84.194.3 with SMTP id g3mr4141689pld.246.1506604451469; Thu, 28 Sep 2017 06:14:11 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1506604451; cv=none; d=google.com; s=arc-20160816; b=G/mFno+DXRq7mYhe9PDTIDT09jMvAI8NB8v3nYFo4eV1NKSOdg/rYYMnsLJLq4/hjp RX5HHtNxbDt05D3+C8adRYGJ/3d3vAO2APX/weHZPvPVbOsBJgvyk9BTrHJhtUEZ7rtO 87P1QPOliGNtTMmGpnAwHC7wBoYIcqM2T9YFpcsWog2vzP3k5xozqgPT4kYO0MUTX51v nueCzFPj6MwoGuVL3VLQ7Q3sffrNqr20XNTEmWs9pUZPr9jhj9ZJxArYYXt1s5Uc51DE Dlt9Uc2s/6dkTBkpXUaM13pS6BXeQ7hHaGOofAYOimg87R9gcDKZxvInvBOYFWuc0Lms /QQA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:references:in-reply-to:message-id:date :subject:cc:to:from:arc-authentication-results; bh=gxGR7bZ00RcPMxdzG1zm0ZpuijseVr2VvuB23nvc6So=; b=fSV7M5w3OKTgMnTbYC/n6oSuBgUYfbB4/fnBGGeWCoFT6QT6V2VVb+k3wCDjIt8K9a 1oNBMxPUnqbYeLldsaJ0hOlfaqdm3/pVustqTb3FenFo8Nkavwmzlbj6OpQPgs0hpApb TLcpXYEJbQk4RXKj7uNd29nQqWQqTe+rjLjDfHFV816EHSuARHlKmYUf1VgH1BQsHl8o 2beCGb+7IVuaBbq+hSSydoxoK6ytteZ0pqWTBk4qBAHha5bkgff5AFvyKJuHqBgh2wIc XEkewIGjJ2dId5wWSJAXWsSNr7OG6i2gj6VYu3j/RXE53RXMZWRAg9caOewrOWPKSE2t X7aw== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id v11si1386448pgo.292.2017.09.28.06.14.10; Thu, 28 Sep 2017 06:14:11 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753227AbdI1NOI (ORCPT + 26 others); Thu, 28 Sep 2017 09:14:08 -0400 Received: from foss.arm.com ([217.140.101.70]:56922 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751943AbdI1NOG (ORCPT ); Thu, 28 Sep 2017 09:14:06 -0400 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 747E61596; Thu, 28 Sep 2017 06:14:06 -0700 (PDT) Received: from e107155-lin.cambridge.arm.com (unknown [10.1.210.28]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 1B09D3F483; Thu, 28 Sep 2017 06:14:03 -0700 (PDT) From: Sudeep Holla To: ALKML , LKML , DTML Cc: Sudeep Holla , Roy Franz , Harb Abdulhamid , Nishanth Menon , Arnd Bergmann , Loc Ho , Alexey Klimov , Ryan Harkin , Jassi Brar , Rob Herring , Mark Rutland Subject: [PATCH v3 01/22] dt-bindings: mailbox: add support for mailbox client shared memory Date: Thu, 28 Sep 2017 14:11:25 +0100 Message-Id: <1506604306-20739-2-git-send-email-sudeep.holla@arm.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1506604306-20739-1-git-send-email-sudeep.holla@arm.com> References: <1506604306-20739-1-git-send-email-sudeep.holla@arm.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Many users of the mailbox controllers depend on the shared memory between the two end points to exchange the main data while using simple doorbell mechanism to alert the end points of the presence of a message. This patch defines device tree bindings to represent such shared memory in a generic way. Cc: Rob Herring Cc: Mark Rutland Acked-by: Rob Herring Signed-off-by: Sudeep Holla --- .../devicetree/bindings/mailbox/mailbox.txt | 28 ++++++++++++++++++++++ 1 file changed, 28 insertions(+) -- 2.7.4 diff --git a/Documentation/devicetree/bindings/mailbox/mailbox.txt b/Documentation/devicetree/bindings/mailbox/mailbox.txt index be05b9746c69..af8ecee2ac68 100644 --- a/Documentation/devicetree/bindings/mailbox/mailbox.txt +++ b/Documentation/devicetree/bindings/mailbox/mailbox.txt @@ -23,6 +23,11 @@ assign appropriate mailbox channel to client drivers. Optional property: - mbox-names: List of identifier strings for each mailbox channel. +- shmem : List of phandle pointing to the shared memory(SHM) area between the + users of these mailboxes for IPC, one for each mailbox. This shared + memory can be part of any memory reserved for the purpose of this + communication between the mailbox client and the remote. + Example: pwr_cntrl: power { @@ -30,3 +35,26 @@ assign appropriate mailbox channel to client drivers. mbox-names = "pwr-ctrl", "rpc"; mboxes = <&mailbox 0 &mailbox 1>; }; + +Example with shared memory(shmem): + + sram: sram@50000000 { + compatible = "mmio-sram"; + reg = <0x50000000 0x10000>; + + #address-cells = <1>; + #size-cells = <1>; + ranges = <0 0x50000000 0x10000>; + + cl_shmem: shmem@0 { + compatible = "client-shmem"; + reg = <0x0 0x200>; + }; + }; + + client@2e000000 { + ... + mboxes = <&mailbox 0>; + shmem = <&cl_shmem>; + .. + };