2 * dwc3-of-simple.c - OF glue layer for simple integrations
4 * Copyright (c) 2015 Texas Instruments Incorporated - http://www.ti.com
6 * Author: Felipe Balbi <balbi@ti.com>
8 * This program is free software: you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 of
10 * the License as published by the Free Software Foundation.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * This is a combination of the old dwc3-qcom.c by Ivan T. Ivanov
18 * <iivanov@mm-sol.com> and the original patch adding support for Xilinx' SoC
19 * by Subbaraya Sundeep Bhatta <subbaraya.sundeep.bhatta@xilinx.com>
22 #include <linux/module.h>
23 #include <linux/kernel.h>
24 #include <linux/slab.h>
25 #include <linux/platform_device.h>
26 #include <linux/dma-mapping.h>
27 #include <linux/clk.h>
28 #include <linux/clk-provider.h>
30 #include <linux/of_platform.h>
31 #include <linux/pm_runtime.h>
33 struct dwc3_of_simple {
39 static int dwc3_of_simple_probe(struct platform_device *pdev)
41 struct dwc3_of_simple *simple;
42 struct device *dev = &pdev->dev;
43 struct device_node *np = dev->of_node;
48 simple = devm_kzalloc(dev, sizeof(*simple), GFP_KERNEL);
52 ret = of_clk_get_parent_count(np);
56 simple->num_clocks = ret;
58 simple->clks = devm_kcalloc(dev, simple->num_clocks,
59 sizeof(struct clk *), GFP_KERNEL);
65 for (i = 0; i < simple->num_clocks; i++) {
68 clk = of_clk_get(np, i);
71 clk_put(simple->clks[i]);
75 ret = clk_prepare_enable(clk);
78 clk_disable_unprepare(simple->clks[i]);
79 clk_put(simple->clks[i]);
86 simple->clks[i] = clk;
89 ret = of_platform_populate(np, NULL, NULL, dev);
91 for (i = 0; i < simple->num_clocks; i++) {
92 clk_disable_unprepare(simple->clks[i]);
93 clk_put(simple->clks[i]);
99 pm_runtime_set_active(dev);
100 pm_runtime_enable(dev);
101 pm_runtime_get_sync(dev);
106 static int dwc3_of_simple_remove(struct platform_device *pdev)
108 struct dwc3_of_simple *simple = platform_get_drvdata(pdev);
109 struct device *dev = &pdev->dev;
112 for (i = 0; i < simple->num_clocks; i++) {
113 clk_unprepare(simple->clks[i]);
114 clk_put(simple->clks[i]);
117 of_platform_depopulate(dev);
119 pm_runtime_put_sync(dev);
120 pm_runtime_disable(dev);
126 static int dwc3_of_simple_runtime_suspend(struct device *dev)
128 struct dwc3_of_simple *simple = dev_get_drvdata(dev);
131 for (i = 0; i < simple->num_clocks; i++)
132 clk_disable(simple->clks[i]);
137 static int dwc3_of_simple_runtime_resume(struct device *dev)
139 struct dwc3_of_simple *simple = dev_get_drvdata(dev);
143 for (i = 0; i < simple->num_clocks; i++) {
144 ret = clk_enable(simple->clks[i]);
147 clk_disable(simple->clks[i]);
156 static const struct dev_pm_ops dwc3_of_simple_dev_pm_ops = {
157 SET_RUNTIME_PM_OPS(dwc3_of_simple_runtime_suspend,
158 dwc3_of_simple_runtime_resume, NULL)
161 static const struct of_device_id of_dwc3_simple_match[] = {
162 { .compatible = "qcom,dwc3" },
163 { .compatible = "xlnx,zynqmp-dwc3" },
166 MODULE_DEVICE_TABLE(of, of_dwc3_simple_match);
168 static struct platform_driver dwc3_of_simple_driver = {
169 .probe = dwc3_of_simple_probe,
170 .remove = dwc3_of_simple_remove,
172 .name = "dwc3-of-simple",
173 .of_match_table = of_dwc3_simple_match,
177 module_platform_driver(dwc3_of_simple_driver);
178 MODULE_LICENSE("GPL v2");
179 MODULE_DESCRIPTION("DesignWare USB3 OF Simple Glue Layer");
180 MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");