From patchwork Wed Mar 13 15:50:32 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Fabien DESSENNE X-Patchwork-Id: 1056120 Return-Path: X-Original-To: incoming-dt@patchwork.ozlabs.org Delivered-To: patchwork-incoming-dt@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=devicetree-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=st.com Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 44KGXs5ZW7z9s4Y for ; Thu, 14 Mar 2019 02:51:25 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726713AbfCMPvW (ORCPT ); Wed, 13 Mar 2019 11:51:22 -0400 Received: from mx08-00178001.pphosted.com ([91.207.212.93]:47042 "EHLO mx07-00178001.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726074AbfCMPvU (ORCPT ); Wed, 13 Mar 2019 11:51:20 -0400 Received: from pps.filterd (m0046661.ppops.net [127.0.0.1]) by mx08-00178001.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x2DFp5Kb012434; Wed, 13 Mar 2019 16:51:05 +0100 Received: from beta.dmz-eu.st.com (beta.dmz-eu.st.com [164.129.1.35]) by mx08-00178001.pphosted.com with ESMTP id 2r458mjyf1-1 (version=TLSv1 cipher=ECDHE-RSA-AES256-SHA bits=256 verify=NOT); Wed, 13 Mar 2019 16:51:05 +0100 Received: from zeta.dmz-eu.st.com (zeta.dmz-eu.st.com [164.129.230.9]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id C82E038; Wed, 13 Mar 2019 15:51:02 +0000 (GMT) Received: from Webmail-eu.st.com (Safex1hubcas24.st.com [10.75.90.94]) by zeta.dmz-eu.st.com (STMicroelectronics) with ESMTP id A2A8953EF; Wed, 13 Mar 2019 15:51:02 +0000 (GMT) Received: from SAFEX1HUBCAS22.st.com (10.75.90.93) by Safex1hubcas24.st.com (10.75.90.94) with Microsoft SMTP Server (TLS) id 14.3.435.0; Wed, 13 Mar 2019 16:51:02 +0100 Received: from localhost (10.201.23.25) by Webmail-ga.st.com (10.75.90.48) with Microsoft SMTP Server (TLS) id 14.3.361.1; Wed, 13 Mar 2019 16:51:02 +0100 From: Fabien Dessenne To: Ohad Ben-Cohen , Bjorn Andersson , Rob Herring , Mark Rutland , Maxime Coquelin , Alexandre Torgue , Jonathan Corbet , , , , , , CC: Fabien Dessenne , Benjamin Gaignard Subject: [PATCH 1/6] dt-bindings: hwlock: add support of shared locks Date: Wed, 13 Mar 2019 16:50:32 +0100 Message-ID: <1552492237-28810-2-git-send-email-fabien.dessenne@st.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1552492237-28810-1-git-send-email-fabien.dessenne@st.com> References: <1552492237-28810-1-git-send-email-fabien.dessenne@st.com> MIME-Version: 1.0 X-Originating-IP: [10.201.23.25] X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2019-03-13_09:, , signatures=0 Sender: devicetree-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org Use #hwlock-cells value to define whether the locks can be shared by several users. Signed-off-by: Fabien Dessenne Reviewed-by: Rob Herring --- .../devicetree/bindings/hwlock/hwlock.txt | 27 ++++++++++++++++------ 1 file changed, 20 insertions(+), 7 deletions(-) diff --git a/Documentation/devicetree/bindings/hwlock/hwlock.txt b/Documentation/devicetree/bindings/hwlock/hwlock.txt index 085d1f5..e98088a 100644 --- a/Documentation/devicetree/bindings/hwlock/hwlock.txt +++ b/Documentation/devicetree/bindings/hwlock/hwlock.txt @@ -13,7 +13,7 @@ hwlock providers: Required properties: - #hwlock-cells: Specifies the number of cells needed to represent a - specific lock. + specific lock. Shall be 1 or 2 (see hwlocks below). hwlock users: ============= @@ -27,6 +27,11 @@ Required properties: #hwlock-cells. The list can have just a single hwlock or multiple hwlocks, with each hwlock represented by a phandle and a corresponding args specifier. + If #hwlock-cells is 1, all of the locks are exclusive + (cannot be used by several users). + If #hwlock-cells is 2, the value of the second cell + defines whether the lock is for exclusive usage (0) or + shared (1) i.e. can be used by several users. Optional properties: - hwlock-names: List of hwlock name strings defined in the same order @@ -46,14 +51,22 @@ of length 1. ... }; -2. Example of a node using multiple specific hwlocks: +2. Example of nodes using multiple and shared specific hwlocks: -The following example has a node requesting two hwlocks, a hwlock within -the hwlock device node 'hwlock1' with #hwlock-cells value of 1, and another -hwlock within the hwlock device node 'hwlock2' with #hwlock-cells value of 2. +The following example has a nodeA requesting two hwlocks: +- an exclusive one (#hwlock-cells = 1) within the hwlock device node 'hwlock1' +- a shared one (#hwlock-cells = 2, second cell = 1) within the hwlock device + node 'hwlock2'. +The shared lock is also be used by nodeB. - node { + nodeA { ... - hwlocks = <&hwlock1 2>, <&hwlock2 0 3>; + hwlocks = <&hwlock1 2>, <&hwlock2 0 1>; ... }; + + nodeB { + ... + hwlocks = <&hwlock2 0 1>; + ... + }; \ No newline at end of file