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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. Reviewed-by: Geert Uytterhoeven Signed-off-by: Liu Ying --- v3->v4: * Drop unnecessary 'bus == NULL' check from simple_pm_bus_runtime_{suspend,resume}. (Geert) * Add Geert's R-b tag. * Resend v4 based on v6.1-rc1. (Greg) v1->v3: * No change. drivers/bus/simple-pm-bus.c | 48 +++++++++++++++++++++++++++++++++++++ 1 file changed, 48 insertions(+) diff --git a/drivers/bus/simple-pm-bus.c b/drivers/bus/simple-pm-bus.c index 6b8d6257ed8a..d7b043fefde9 100644 --- a/drivers/bus/simple-pm-bus.c +++ b/drivers/bus/simple-pm-bus.c @@ -8,17 +8,24 @@ * for more details. */ +#include #include #include #include #include +struct simple_pm_bus { + struct clk_bulk_data *clks; + int num_clks; +}; + static int simple_pm_bus_probe(struct platform_device *pdev) { const struct device *dev = &pdev->dev; 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 @@ -44,6 +51,16 @@ 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); @@ -67,6 +84,36 @@ 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); + + 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; + + 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[] = { @@ -85,6 +132,7 @@ 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, }, }; From patchwork Mon Oct 17 07:40:39 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Liu Ying X-Patchwork-Id: 3256 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a5d:4ac7:0:0:0:0:0 with SMTP id y7csp1318535wrs; Mon, 17 Oct 2022 00:44:13 -0700 (PDT) X-Google-Smtp-Source: AMsMyM7yhExZKkXwpIGrlbgXuByDJXnLbez6P8Ff59ZltJ1tNs2qdkaqJ4TcE+zjiklxB7Rst7nx X-Received: by 2002:a17:907:2c59:b0:78d:8e03:134 with SMTP id hf25-20020a1709072c5900b0078d8e030134mr7473357ejc.310.1665992653628; Mon, 17 Oct 2022 00:44:13 -0700 (PDT) ARC-Seal: i=2; a=rsa-sha256; t=1665992653; cv=pass; d=google.com; s=arc-20160816; b=zhXMM0wr6S42cDmYcUnpHT5PMgA0KdOfVYuSp7KNoOBCt6gBRXDikqNriZPcBhy7EL XjbRDcvrIS/ALKjoaVTH5jmZiQTWQjt9Ber82WAtSqr5ug48lkWUDN2SSWSSXd5v9fLM kBK6wZa4HSUnd3SjmoMbIQVkJIHYsOm9ChAUoGIAU6NIK6kvs1KvWo8txORhLvi4KpRV ih2U0RTIjPgnuha8NomLzLnGnt4czzQFtD2/n4AySPHl9oimk6G4aKtILBT+eRGP4MSw e+49k4AFEqQOPh4fHard8CehsSXZIOi0pYgrbPsvvuOnXgbAmL2GyAGHAgQOUTq8BSfg xVCw== ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:mime-version:content-transfer-encoding :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=nJDEDv1VRRd0eGjIGre7g6bjvhDBPv81iXX5yZ29A5s=; b=dcYkJHZ1s7Bx1zmtFQ/oaz1/CRvf7G2mEmKRX2oAA2BsFb9i3mdz62a/+vwPiGP1El eh9pNU9tDhniq9HIDNbKGJOFsiWeDhipZCLhQixrvahQyLbJIwE5u7VEFCqrzdsKYt+e n99tBNSmBCkE8OwgwB1xl4rjNMHiyD/DQTOQ5ufCA/iwcTBFTSk3z1mIbQHe34D7hABm TMfudgq9EJiW7kcm0Rivu9H1otfsDxnZ2Amu/xndR5m140TDtTRhV/EMyzgi08HFQB1P KZ6CK+Sj6L6aYeEWZi0r3OcrnmhmQSm+WUQbtd/6oZWuUQUbxD6LI0giKmWDRjfuafzs 4wOg== ARC-Authentication-Results: i=2; mx.google.com; dkim=pass header.i=@nxp.com header.s=selector2 header.b=gj0rl7lp; arc=pass (i=1 spf=pass spfdomain=nxp.com dkim=pass dkdomain=nxp.com dmarc=pass fromdomain=nxp.com); spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=nxp.com Received: from out1.vger.email (out1.vger.email. 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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: 49754669-1f02-4a7d-3ab1-08dab012b984 X-MS-Exchange-CrossTenant-AuthSource: AM7PR04MB7046.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 17 Oct 2022 07:39:29.7977 (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: q7zTplxcey6Y0SJbvDiUvvU4efq7PDfg9PFjZ8HDsLJO4uGjuraFxJ79p7TxFrU7IA0aRIW2+swg6/h7CW6Flg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: AS8PR04MB8296 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2,SPF_HELO_PASS,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1746919912487095681?= X-GMAIL-MSGID: =?utf-8?q?1746919912487095681?= Freescale i.MX8qxp pixel link MSI bus is a simple memory-mapped bus. It is used to access peripherals in i.MX8qm/qxp imaging, LVDS, MIPI DSI and HDMI TX subsystems, like I2C controller, PWM controller, MIPI DSI controller and Control and Status Registers (CSR) module. Reference simple-pm-bus bindings and add Freescale i.MX8qxp pixel link MSI bus specific bindings. Reviewed-by: Rob Herring Signed-off-by: Liu Ying --- v3->v4: * Add child nodes in the example MSI bus node of the MSI bus dt-binding. (Krzysztof) * Resend v4 to imply this patch is based on v6.0-rc1 so that there are not any dependencies. (Rob) * Resend v4 based on v6.1-rc1. (Greg) * Add Rob's R-b tag. v2->v3: * Add a pattern property to allow child nodes. (Rob) v1->v2: Address Krzysztof's comments: * Add a select to explicitly select the MSI bus dt-binding. * List 'simple-pm-bus' explicitly as one item of compatible strings. * Require compatible and reg properties. * Put reg property just after compatible property in example. .../bus/fsl,imx8qxp-pixel-link-msi-bus.yaml | 232 ++++++++++++++++++ 1 file changed, 232 insertions(+) create mode 100644 Documentation/devicetree/bindings/bus/fsl,imx8qxp-pixel-link-msi-bus.yaml diff --git a/Documentation/devicetree/bindings/bus/fsl,imx8qxp-pixel-link-msi-bus.yaml b/Documentation/devicetree/bindings/bus/fsl,imx8qxp-pixel-link-msi-bus.yaml new file mode 100644 index 000000000000..b568d0ce438d --- /dev/null +++ b/Documentation/devicetree/bindings/bus/fsl,imx8qxp-pixel-link-msi-bus.yaml @@ -0,0 +1,232 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/bus/fsl,imx8qxp-pixel-link-msi-bus.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Freescale i.MX8qxp Pixel Link Medium Speed Interconnect (MSI) Bus + +maintainers: + - Liu Ying + +description: | + i.MX8qxp pixel link MSI bus is used to control settings of PHYs, I/Os + sitting together with the PHYs. It is not the same as the MSI bus coming + from i.MX8 System Controller Unit (SCU) which is used to control power, + clock and reset through the i.MX8 Distributed Slave System Controller (DSC). + + i.MX8qxp pixel link MSI bus is a simple memory-mapped bus. Two input clocks, + that is, MSI clock and AHB clock, need to be enabled so that peripherals + connected to the bus can be accessed. Also, the bus is part of a power + domain. The power domain needs to be enabled before the peripherals can + be accessed. + + Peripherals in i.MX8qm/qxp imaging, LVDS, MIPI DSI and HDMI TX subsystems, + like I2C controller, PWM controller, MIPI DSI controller and Control and + Status Registers (CSR) module, are accessed through the bus. + + The i.MX System Controller Firmware (SCFW) owns and uses the i.MX8qm/qxp + pixel link MSI bus controller and does not allow SCFW user to control it. + So, the controller's registers cannot be accessed by SCFW user. Hence, + the interrupts generated by the controller don't make any sense from SCFW + user's point of view. + +allOf: + - $ref: simple-pm-bus.yaml# + +# We need a select here so we don't match all nodes with 'simple-pm-bus'. +select: + properties: + compatible: + contains: + enum: + - fsl,imx8qxp-display-pixel-link-msi-bus + - fsl,imx8qm-display-pixel-link-msi-bus + required: + - compatible + +properties: + compatible: + items: + - enum: + - fsl,imx8qxp-display-pixel-link-msi-bus + - fsl,imx8qm-display-pixel-link-msi-bus + - const: simple-pm-bus + + reg: + maxItems: 1 + + interrupts: + maxItems: 1 + + clocks: + items: + - description: master gated clock from system + - description: AHB clock + + clock-names: + items: + - const: msi + - const: ahb + +patternProperties: + "^.*@[0-9a-f]+$": + description: Devices attached to the bus + type: object + properties: + reg: + maxItems: 1 + + required: + - reg + +required: + - compatible + - reg + - clocks + - clock-names + - power-domains + +unevaluatedProperties: false + +examples: + - | + #include + #include + bus@56200000 { + compatible = "fsl,imx8qxp-display-pixel-link-msi-bus", "simple-pm-bus"; + reg = <0x56200000 0x20000>; + #address-cells = <1>; + #size-cells = <1>; + interrupt-parent = <&dc0_irqsteer>; + interrupts = <320>; + ranges; + clocks = <&dc0_disp_ctrl_link_mst0_lpcg IMX_LPCG_CLK_4>, + <&dc0_disp_ctrl_link_mst0_lpcg IMX_LPCG_CLK_4>; + clock-names = "msi", "ahb"; + power-domains = <&pd IMX_SC_R_DC_0>; + + syscon@56221000 { + compatible = "fsl,imx8qxp-mipi-lvds-csr", "syscon", "simple-mfd"; + reg = <0x56221000 0x1000>; + clocks = <&mipi_lvds_0_di_mipi_lvds_regs_lpcg IMX_LPCG_CLK_4>; + clock-names = "ipg"; + + pxl2dpi { + compatible = "fsl,imx8qxp-pxl2dpi"; + fsl,sc-resource = ; + power-domains = <&pd IMX_SC_R_MIPI_0>; + + ports { + #address-cells = <1>; + #size-cells = <0>; + + port@0 { + #address-cells = <1>; + #size-cells = <0>; + reg = <0>; + + mipi_lvds_0_pxl2dpi_dc0_pixel_link0: endpoint@0 { + reg = <0>; + remote-endpoint = <&dc0_pixel_link0_mipi_lvds_0_pxl2dpi>; + }; + + mipi_lvds_0_pxl2dpi_dc0_pixel_link1: endpoint@1 { + reg = <1>; + remote-endpoint = <&dc0_pixel_link1_mipi_lvds_0_pxl2dpi>; + }; + }; + + port@1 { + #address-cells = <1>; + #size-cells = <0>; + reg = <1>; + + mipi_lvds_0_pxl2dpi_mipi_lvds_0_ldb_ch0: endpoint@0 { + reg = <0>; + remote-endpoint = <&mipi_lvds_0_ldb_ch0_mipi_lvds_0_pxl2dpi>; + }; + + mipi_lvds_0_pxl2dpi_mipi_lvds_0_ldb_ch1: endpoint@1 { + reg = <1>; + remote-endpoint = <&mipi_lvds_0_ldb_ch1_mipi_lvds_0_pxl2dpi>; + }; + }; + }; + }; + + ldb { + #address-cells = <1>; + #size-cells = <0>; + compatible = "fsl,imx8qxp-ldb"; + clocks = <&clk IMX_SC_R_LVDS_0 IMX_SC_PM_CLK_MISC2>, + <&clk IMX_SC_R_LVDS_0 IMX_SC_PM_CLK_BYPASS>; + clock-names = "pixel", "bypass"; + power-domains = <&pd IMX_SC_R_LVDS_0>; + + channel@0 { + #address-cells = <1>; + #size-cells = <0>; + reg = <0>; + phys = <&mipi_lvds_0_phy>; + phy-names = "lvds_phy"; + + port@0 { + reg = <0>; + + mipi_lvds_0_ldb_ch0_mipi_lvds_0_pxl2dpi: endpoint { + remote-endpoint = <&mipi_lvds_0_pxl2dpi_mipi_lvds_0_ldb_ch0>; + }; + }; + + port@1 { + reg = <1>; + + /* ... */ + }; + }; + + channel@1 { + #address-cells = <1>; + #size-cells = <0>; + reg = <1>; + phys = <&mipi_lvds_0_phy>; + phy-names = "lvds_phy"; + + port@0 { + reg = <0>; + + mipi_lvds_0_ldb_ch1_mipi_lvds_0_pxl2dpi: endpoint { + remote-endpoint = <&mipi_lvds_0_pxl2dpi_mipi_lvds_0_ldb_ch1>; + }; + }; + + port@1 { + reg = <1>; + + /* ... */ + }; + }; + }; + }; + + clock-controller@56223004 { + compatible = "fsl,imx8qxp-lpcg"; + reg = <0x56223004 0x4>; + #clock-cells = <1>; + clocks = <&mipi_lvds_0_ipg_clk>; + clock-indices = ; + clock-output-names = "mipi_lvds_0_di_mipi_lvds_regs_lpcg_ipg_clk"; + power-domains = <&pd IMX_SC_R_MIPI_0>; + }; + + phy@56228300 { + compatible = "fsl,imx8qxp-mipi-dphy"; + reg = <0x56228300 0x100>; + clocks = <&clk IMX_SC_R_LVDS_0 IMX_SC_PM_CLK_PHY>; + clock-names = "phy_ref"; + #phy-cells = <0>; + fsl,syscon = <&mipi_lvds_0_csr>; + power-domains = <&pd IMX_SC_R_MIPI_0>; + }; + };