From patchwork Wed Aug 3 01:24:20 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ying Liu X-Patchwork-Id: 595164 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7DF4BC00140 for ; Wed, 3 Aug 2022 01:23:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235628AbiHCBXE (ORCPT ); Tue, 2 Aug 2022 21:23:04 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44078 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235426AbiHCBW5 (ORCPT ); Tue, 2 Aug 2022 21:22:57 -0400 Received: from EUR05-DB8-obe.outbound.protection.outlook.com (mail-db8eur05on2040.outbound.protection.outlook.com [40.107.20.40]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6744C564C4; Tue, 2 Aug 2022 18:22:55 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=jpzkLUcB70QH07K562qll24diYPi163aaeYTfZZgLLhGsu4c9Lnbhi+6Xr2PrY8/0N6dhRuKssLcAYIRBqzpgnFJvFkdJCSqQRbu2OKTJbNv1ZPxvvg+KsvpVdm+04J1nh3uru1uw/mMQtb8wiFUWIh/lvMcdpITKZtGob6sb6HbW0Ok3cJzNn7tOrebYr1gfQkJ/Nx/DdN/T5KRqz/cf6fyPGLYgFXylD425u+41XMkpIG6CSqZpDyUxV1Z6Jut0pe+04DvBhf1ZhIMz+mtY1z3XeZrgrPtFzLn8hDkBHWhvRsoMYsXvFJU/AXXbwALDHaMVCrK4B8k2EtmSQ0DCA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=VTA1xZE5g6eK6lR/E0NIVumBT9olJ5kQ9LGNSe3P7Fk=; b=FrGNAndK4DW4oLNVOkqFhPcJjz2ptknmaeShS44QsI4M6gnMJpycc3zuqkaAsQ6nvJyfskPQcydMk7N/uSD5omV92VJENh2rOcMt+e35A/xebJqP7HOtLYbSLtL8lXqXICEZ36u0lyXxN05WQAm6KfodpnkTH9bJtSRTbiL1USITuuFTFf12pi6RjhRC05p1gsJvVXLN6DCLpDky7h8LZkQ2QL8xomRiQU4/d0sQHWcm2657RpCbW/F3cG9Si/mvbp4KV+ehsqGiQjkD8MlAWZyQI0A++uQkCBzAV1X27w4QYGwVQRxr18XRDiNHJuJ63KFWykX/U38vvJWnu7Dgpg== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=nxp.com; dmarc=pass action=none header.from=nxp.com; dkim=pass header.d=nxp.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nxp.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=VTA1xZE5g6eK6lR/E0NIVumBT9olJ5kQ9LGNSe3P7Fk=; b=KXqxnrVRXJqB8CSLYEDGW2ji6NKX8okpKweIf04BSdWdZMoTGcHPNAoQlH43Kgsamr2rVDdRnqS8p4Gx9Psdx78NIukcJuhlu08tpb20U8WKr9g+F8rxj4ZFoKeSdpSsbJKgqL7NawN+Eq4Gs7uZo8fBGJC1Xy6wLONAx88r4/U= Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=nxp.com; Received: from AM7PR04MB7046.eurprd04.prod.outlook.com (2603:10a6:20b:113::22) by DB8PR04MB6891.eurprd04.prod.outlook.com (2603:10a6:10:112::7) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5504.14; Wed, 3 Aug 2022 01:22:53 +0000 Received: from AM7PR04MB7046.eurprd04.prod.outlook.com ([fe80::2549:869e:d80b:3a1b]) by AM7PR04MB7046.eurprd04.prod.outlook.com ([fe80::2549:869e:d80b:3a1b%6]) with mapi id 15.20.5504.014; Wed, 3 Aug 2022 01:22:53 +0000 From: Liu Ying To: devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Cc: robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, shawnguo@kernel.org, s.hauer@pengutronix.de, kernel@pengutronix.de, festevam@gmail.com, linux-imx@nxp.com, saravanak@google.com, gregkh@linuxfoundation.org, geert+renesas@glider.be, krzysztof.kozlowski@linaro.org Subject: [PATCH v2 2/3] drivers: bus: simple-pm-bus: Use clocks Date: Wed, 3 Aug 2022 09:24:20 +0800 Message-Id: <20220803012421.3410226-3-victor.liu@nxp.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220803012421.3410226-1-victor.liu@nxp.com> References: <20220803012421.3410226-1-victor.liu@nxp.com> X-ClientProxiedBy: SI2PR04CA0009.apcprd04.prod.outlook.com (2603:1096:4:197::8) To AM7PR04MB7046.eurprd04.prod.outlook.com (2603:10a6:20b:113::22) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: edae6ed7-a895-4698-48f4-08da74eeafeb X-MS-TrafficTypeDiagnostic: DB8PR04MB6891:EE_ X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255; CTRY:; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:AM7PR04MB7046.eurprd04.prod.outlook.com; PTR:; CAT:NONE; SFS:(13230016)(4636009)(366004)(376002)(346002)(396003)(136003)(39860400002)(316002)(86362001)(5660300002)(7416002)(8936002)(66556008)(8676002)(66946007)(66476007)(4326008)(26005)(6512007)(1076003)(83380400001)(2616005)(186003)(52116002)(478600001)(6486002)(6666004)(38100700002)(38350700002)(6506007)(41300700001)(2906002)(36756003); DIR:OUT; SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 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 X-OriginatorOrg: nxp.com X-MS-Exchange-CrossTenant-Network-Message-Id: edae6ed7-a895-4698-48f4-08da74eeafeb X-MS-Exchange-CrossTenant-AuthSource: AM7PR04MB7046.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 03 Aug 2022 01:22:53.1316 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: /7r8OEj080jAoYwzZO8mMRK0YCAyfz8GvmZaT3rG1v5wtdF5Gi6bK2hrYrKldAHLOZWb9QN6h5rRrPq4qMYUjQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB8PR04MB6891 Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org Simple Power-Managed bus controller may need functional clock(s) to be enabled before child devices connected to the bus can be accessed. Get the clock(s) as a bulk and enable/disable the clock(s) when the bus is being power managed. One example is that Freescale i.MX8qxp pixel link MSI bus controller needs MSI clock and AHB clock to be enabled before accessing child devices. Signed-off-by: Liu Ying --- v1->v2: * No change. drivers/bus/simple-pm-bus.c | 54 +++++++++++++++++++++++++++++++++++++ 1 file changed, 54 insertions(+) diff --git a/drivers/bus/simple-pm-bus.c b/drivers/bus/simple-pm-bus.c index ff5f8ca5c024..876a906724b3 100644 --- a/drivers/bus/simple-pm-bus.c +++ b/drivers/bus/simple-pm-bus.c @@ -8,11 +8,17 @@ * for more details. */ +#include #include #include #include #include +struct simple_pm_bus { + struct clk_bulk_data *clks; + int num_clks; +}; + static const struct of_device_id simple_pm_bus_child_matches[] = { { .compatible = "simple-mfd", }, {} @@ -24,6 +30,7 @@ static int simple_pm_bus_probe(struct platform_device *pdev) const struct of_dev_auxdata *lookup = dev_get_platdata(dev); struct device_node *np = dev->of_node; const struct of_device_id *match; + struct simple_pm_bus *bus; /* * Allow user to use driver_override to bind this driver to a @@ -49,6 +56,16 @@ static int simple_pm_bus_probe(struct platform_device *pdev) return -ENODEV; } + bus = devm_kzalloc(&pdev->dev, sizeof(*bus), GFP_KERNEL); + if (!bus) + return -ENOMEM; + + bus->num_clks = devm_clk_bulk_get_all(&pdev->dev, &bus->clks); + if (bus->num_clks < 0) + return dev_err_probe(&pdev->dev, bus->num_clks, "failed to get clocks\n"); + + dev_set_drvdata(&pdev->dev, bus); + dev_dbg(&pdev->dev, "%s\n", __func__); pm_runtime_enable(&pdev->dev); @@ -72,6 +89,42 @@ static int simple_pm_bus_remove(struct platform_device *pdev) return 0; } +static int simple_pm_bus_runtime_suspend(struct device *dev) +{ + struct simple_pm_bus *bus = dev_get_drvdata(dev); + + if (!bus) + return 0; + + clk_bulk_disable_unprepare(bus->num_clks, bus->clks); + + return 0; +} + +static int simple_pm_bus_runtime_resume(struct device *dev) +{ + struct simple_pm_bus *bus = dev_get_drvdata(dev); + int ret; + + if (!bus) + return 0; + + ret = clk_bulk_prepare_enable(bus->num_clks, bus->clks); + if (ret) { + dev_err(dev, "failed to enable clocks: %d\n", ret); + return ret; + } + + return 0; +} + +static const struct dev_pm_ops simple_pm_bus_pm_ops = { + SET_RUNTIME_PM_OPS(simple_pm_bus_runtime_suspend, + simple_pm_bus_runtime_resume, NULL) + SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, + pm_runtime_force_resume) +}; + #define ONLY_BUS ((void *) 1) /* Match if the device is only a bus. */ static const struct of_device_id simple_pm_bus_of_match[] = { @@ -90,6 +143,7 @@ static struct platform_driver simple_pm_bus_driver = { .driver = { .name = "simple-pm-bus", .of_match_table = simple_pm_bus_of_match, + .pm = &simple_pm_bus_pm_ops, }, };