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258 lines
5.9 KiB
258 lines
5.9 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/** |
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* dwc3-exynos.c - Samsung Exynos DWC3 Specific Glue layer |
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* |
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* Copyright (c) 2012 Samsung Electronics Co., Ltd. |
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* http://www.samsung.com |
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* |
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* Author: Anton Tikhomirov <[email protected]> |
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*/ |
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#include <linux/module.h> |
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#include <linux/kernel.h> |
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#include <linux/slab.h> |
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#include <linux/platform_device.h> |
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#include <linux/clk.h> |
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#include <linux/of.h> |
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#include <linux/of_platform.h> |
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#include <linux/regulator/consumer.h> |
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#define DWC3_EXYNOS_MAX_CLOCKS 4 |
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struct dwc3_exynos_driverdata { |
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const char *clk_names[DWC3_EXYNOS_MAX_CLOCKS]; |
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int num_clks; |
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int suspend_clk_idx; |
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}; |
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struct dwc3_exynos { |
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struct device *dev; |
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const char **clk_names; |
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struct clk *clks[DWC3_EXYNOS_MAX_CLOCKS]; |
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int num_clks; |
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int suspend_clk_idx; |
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struct regulator *vdd33; |
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struct regulator *vdd10; |
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}; |
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static int dwc3_exynos_remove_child(struct device *dev, void *unused) |
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{ |
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struct platform_device *pdev = to_platform_device(dev); |
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platform_device_unregister(pdev); |
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return 0; |
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} |
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static int dwc3_exynos_probe(struct platform_device *pdev) |
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{ |
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struct dwc3_exynos *exynos; |
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struct device *dev = &pdev->dev; |
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struct device_node *node = dev->of_node; |
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const struct dwc3_exynos_driverdata *driver_data; |
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int i, ret; |
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exynos = devm_kzalloc(dev, sizeof(*exynos), GFP_KERNEL); |
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if (!exynos) |
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return -ENOMEM; |
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driver_data = of_device_get_match_data(dev); |
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exynos->dev = dev; |
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exynos->num_clks = driver_data->num_clks; |
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exynos->clk_names = (const char **)driver_data->clk_names; |
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exynos->suspend_clk_idx = driver_data->suspend_clk_idx; |
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platform_set_drvdata(pdev, exynos); |
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for (i = 0; i < exynos->num_clks; i++) { |
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exynos->clks[i] = devm_clk_get(dev, exynos->clk_names[i]); |
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if (IS_ERR(exynos->clks[i])) { |
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dev_err(dev, "failed to get clock: %s\n", |
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exynos->clk_names[i]); |
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return PTR_ERR(exynos->clks[i]); |
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} |
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} |
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for (i = 0; i < exynos->num_clks; i++) { |
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ret = clk_prepare_enable(exynos->clks[i]); |
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if (ret) { |
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while (i-- > 0) |
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clk_disable_unprepare(exynos->clks[i]); |
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return ret; |
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} |
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} |
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if (exynos->suspend_clk_idx >= 0) |
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clk_prepare_enable(exynos->clks[exynos->suspend_clk_idx]); |
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exynos->vdd33 = devm_regulator_get(dev, "vdd33"); |
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if (IS_ERR(exynos->vdd33)) { |
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ret = PTR_ERR(exynos->vdd33); |
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goto vdd33_err; |
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} |
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ret = regulator_enable(exynos->vdd33); |
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if (ret) { |
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dev_err(dev, "Failed to enable VDD33 supply\n"); |
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goto vdd33_err; |
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} |
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exynos->vdd10 = devm_regulator_get(dev, "vdd10"); |
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if (IS_ERR(exynos->vdd10)) { |
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ret = PTR_ERR(exynos->vdd10); |
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goto vdd10_err; |
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} |
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ret = regulator_enable(exynos->vdd10); |
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if (ret) { |
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dev_err(dev, "Failed to enable VDD10 supply\n"); |
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goto vdd10_err; |
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} |
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if (node) { |
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ret = of_platform_populate(node, NULL, NULL, dev); |
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if (ret) { |
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dev_err(dev, "failed to add dwc3 core\n"); |
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goto populate_err; |
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} |
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} else { |
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dev_err(dev, "no device node, failed to add dwc3 core\n"); |
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ret = -ENODEV; |
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goto populate_err; |
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} |
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return 0; |
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populate_err: |
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regulator_disable(exynos->vdd10); |
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vdd10_err: |
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regulator_disable(exynos->vdd33); |
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vdd33_err: |
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for (i = exynos->num_clks - 1; i >= 0; i--) |
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clk_disable_unprepare(exynos->clks[i]); |
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if (exynos->suspend_clk_idx >= 0) |
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clk_disable_unprepare(exynos->clks[exynos->suspend_clk_idx]); |
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return ret; |
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} |
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static int dwc3_exynos_remove(struct platform_device *pdev) |
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{ |
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struct dwc3_exynos *exynos = platform_get_drvdata(pdev); |
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int i; |
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device_for_each_child(&pdev->dev, NULL, dwc3_exynos_remove_child); |
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for (i = exynos->num_clks - 1; i >= 0; i--) |
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clk_disable_unprepare(exynos->clks[i]); |
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if (exynos->suspend_clk_idx >= 0) |
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clk_disable_unprepare(exynos->clks[exynos->suspend_clk_idx]); |
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regulator_disable(exynos->vdd33); |
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regulator_disable(exynos->vdd10); |
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return 0; |
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} |
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static const struct dwc3_exynos_driverdata exynos5250_drvdata = { |
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.clk_names = { "usbdrd30" }, |
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.num_clks = 1, |
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.suspend_clk_idx = -1, |
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}; |
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static const struct dwc3_exynos_driverdata exynos5433_drvdata = { |
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.clk_names = { "aclk", "susp_clk", "pipe_pclk", "phyclk" }, |
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.num_clks = 4, |
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.suspend_clk_idx = 1, |
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}; |
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static const struct dwc3_exynos_driverdata exynos7_drvdata = { |
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.clk_names = { "usbdrd30", "usbdrd30_susp_clk", "usbdrd30_axius_clk" }, |
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.num_clks = 3, |
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.suspend_clk_idx = 1, |
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}; |
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static const struct of_device_id exynos_dwc3_match[] = { |
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{ |
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.compatible = "samsung,exynos5250-dwusb3", |
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.data = &exynos5250_drvdata, |
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}, { |
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.compatible = "samsung,exynos5433-dwusb3", |
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.data = &exynos5433_drvdata, |
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}, { |
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.compatible = "samsung,exynos7-dwusb3", |
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.data = &exynos7_drvdata, |
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}, { |
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} |
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}; |
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MODULE_DEVICE_TABLE(of, exynos_dwc3_match); |
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#ifdef CONFIG_PM_SLEEP |
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static int dwc3_exynos_suspend(struct device *dev) |
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{ |
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struct dwc3_exynos *exynos = dev_get_drvdata(dev); |
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int i; |
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for (i = exynos->num_clks - 1; i >= 0; i--) |
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clk_disable_unprepare(exynos->clks[i]); |
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regulator_disable(exynos->vdd33); |
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regulator_disable(exynos->vdd10); |
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return 0; |
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} |
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static int dwc3_exynos_resume(struct device *dev) |
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{ |
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struct dwc3_exynos *exynos = dev_get_drvdata(dev); |
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int i, ret; |
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ret = regulator_enable(exynos->vdd33); |
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if (ret) { |
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dev_err(dev, "Failed to enable VDD33 supply\n"); |
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return ret; |
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} |
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ret = regulator_enable(exynos->vdd10); |
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if (ret) { |
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dev_err(dev, "Failed to enable VDD10 supply\n"); |
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return ret; |
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} |
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for (i = 0; i < exynos->num_clks; i++) { |
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ret = clk_prepare_enable(exynos->clks[i]); |
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if (ret) { |
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while (i-- > 0) |
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clk_disable_unprepare(exynos->clks[i]); |
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return ret; |
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} |
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} |
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return 0; |
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} |
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static const struct dev_pm_ops dwc3_exynos_dev_pm_ops = { |
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SET_SYSTEM_SLEEP_PM_OPS(dwc3_exynos_suspend, dwc3_exynos_resume) |
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}; |
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#define DEV_PM_OPS (&dwc3_exynos_dev_pm_ops) |
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#else |
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#define DEV_PM_OPS NULL |
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#endif /* CONFIG_PM_SLEEP */ |
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static struct platform_driver dwc3_exynos_driver = { |
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.probe = dwc3_exynos_probe, |
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.remove = dwc3_exynos_remove, |
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.driver = { |
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.name = "exynos-dwc3", |
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.of_match_table = exynos_dwc3_match, |
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.pm = DEV_PM_OPS, |
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}, |
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}; |
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module_platform_driver(dwc3_exynos_driver); |
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MODULE_AUTHOR("Anton Tikhomirov <[email protected]>"); |
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MODULE_LICENSE("GPL v2"); |
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MODULE_DESCRIPTION("DesignWare USB3 Exynos Glue Layer");
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