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223 lines
5.4 KiB
223 lines
5.4 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Renesas R-Car Gen3 for USB3.0 PHY driver |
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* |
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* Copyright (C) 2017 Renesas Electronics Corporation |
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*/ |
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#include <linux/clk.h> |
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#include <linux/delay.h> |
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#include <linux/io.h> |
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#include <linux/module.h> |
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#include <linux/of.h> |
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#include <linux/phy/phy.h> |
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#include <linux/platform_device.h> |
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#include <linux/pm_runtime.h> |
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#define USB30_CLKSET0 0x034 |
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#define USB30_CLKSET1 0x036 |
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#define USB30_SSC_SET 0x038 |
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#define USB30_PHY_ENABLE 0x060 |
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#define USB30_VBUS_EN 0x064 |
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/* USB30_CLKSET0 */ |
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#define CLKSET0_PRIVATE 0x05c0 |
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#define CLKSET0_USB30_FSEL_USB_EXTAL 0x0002 |
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/* USB30_CLKSET1 */ |
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#define CLKSET1_USB30_PLL_MULTI_SHIFT 6 |
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#define CLKSET1_USB30_PLL_MULTI_USB_EXTAL (0x64 << \ |
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CLKSET1_USB30_PLL_MULTI_SHIFT) |
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#define CLKSET1_PHYRESET BIT(4) /* 1: reset */ |
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#define CLKSET1_REF_CLKDIV BIT(3) /* 1: USB_EXTAL */ |
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#define CLKSET1_PRIVATE_2_1 BIT(1) /* Write B'01 */ |
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#define CLKSET1_REF_CLK_SEL BIT(0) /* 1: USB3S0_CLK_P */ |
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/* USB30_SSC_SET */ |
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#define SSC_SET_SSC_EN BIT(12) |
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#define SSC_SET_RANGE_SHIFT 9 |
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#define SSC_SET_RANGE_4980 (0x0 << SSC_SET_RANGE_SHIFT) |
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#define SSC_SET_RANGE_4492 (0x1 << SSC_SET_RANGE_SHIFT) |
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#define SSC_SET_RANGE_4003 (0x2 << SSC_SET_RANGE_SHIFT) |
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/* USB30_PHY_ENABLE */ |
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#define PHY_ENABLE_RESET_EN BIT(4) |
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/* USB30_VBUS_EN */ |
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#define VBUS_EN_VBUS_EN BIT(1) |
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struct rcar_gen3_usb3 { |
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void __iomem *base; |
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struct phy *phy; |
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u32 ssc_range; |
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bool usb3s_clk; |
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bool usb_extal; |
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}; |
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static void write_clkset1_for_usb_extal(struct rcar_gen3_usb3 *r, bool reset) |
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{ |
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u16 val = CLKSET1_USB30_PLL_MULTI_USB_EXTAL | |
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CLKSET1_REF_CLKDIV | CLKSET1_PRIVATE_2_1; |
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if (reset) |
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val |= CLKSET1_PHYRESET; |
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writew(val, r->base + USB30_CLKSET1); |
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} |
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static void rcar_gen3_phy_usb3_enable_ssc(struct rcar_gen3_usb3 *r) |
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{ |
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u16 val = SSC_SET_SSC_EN; |
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switch (r->ssc_range) { |
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case 4980: |
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val |= SSC_SET_RANGE_4980; |
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break; |
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case 4492: |
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val |= SSC_SET_RANGE_4492; |
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break; |
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case 4003: |
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val |= SSC_SET_RANGE_4003; |
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break; |
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default: |
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dev_err(&r->phy->dev, "%s: unsupported range (%x)\n", __func__, |
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r->ssc_range); |
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return; |
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} |
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writew(val, r->base + USB30_SSC_SET); |
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} |
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static void rcar_gen3_phy_usb3_select_usb_extal(struct rcar_gen3_usb3 *r) |
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{ |
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write_clkset1_for_usb_extal(r, false); |
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if (r->ssc_range) |
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rcar_gen3_phy_usb3_enable_ssc(r); |
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writew(CLKSET0_PRIVATE | CLKSET0_USB30_FSEL_USB_EXTAL, |
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r->base + USB30_CLKSET0); |
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writew(PHY_ENABLE_RESET_EN, r->base + USB30_PHY_ENABLE); |
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write_clkset1_for_usb_extal(r, true); |
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usleep_range(10, 20); |
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write_clkset1_for_usb_extal(r, false); |
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} |
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static int rcar_gen3_phy_usb3_init(struct phy *p) |
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{ |
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struct rcar_gen3_usb3 *r = phy_get_drvdata(p); |
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dev_vdbg(&r->phy->dev, "%s: enter (%d, %d, %d)\n", __func__, |
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r->usb3s_clk, r->usb_extal, r->ssc_range); |
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if (!r->usb3s_clk && r->usb_extal) |
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rcar_gen3_phy_usb3_select_usb_extal(r); |
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/* Enables VBUS detection anyway */ |
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writew(VBUS_EN_VBUS_EN, r->base + USB30_VBUS_EN); |
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return 0; |
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} |
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static const struct phy_ops rcar_gen3_phy_usb3_ops = { |
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.init = rcar_gen3_phy_usb3_init, |
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.owner = THIS_MODULE, |
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}; |
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static const struct of_device_id rcar_gen3_phy_usb3_match_table[] = { |
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{ .compatible = "renesas,rcar-gen3-usb3-phy" }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(of, rcar_gen3_phy_usb3_match_table); |
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static int rcar_gen3_phy_usb3_probe(struct platform_device *pdev) |
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{ |
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struct device *dev = &pdev->dev; |
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struct rcar_gen3_usb3 *r; |
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struct phy_provider *provider; |
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struct resource *res; |
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int ret = 0; |
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struct clk *clk; |
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if (!dev->of_node) { |
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dev_err(dev, "This driver needs device tree\n"); |
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return -EINVAL; |
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} |
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r = devm_kzalloc(dev, sizeof(*r), GFP_KERNEL); |
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if (!r) |
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return -ENOMEM; |
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
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r->base = devm_ioremap_resource(dev, res); |
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if (IS_ERR(r->base)) |
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return PTR_ERR(r->base); |
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clk = devm_clk_get(dev, "usb3s_clk"); |
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if (!IS_ERR(clk) && !clk_prepare_enable(clk)) { |
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r->usb3s_clk = !!clk_get_rate(clk); |
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clk_disable_unprepare(clk); |
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} |
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clk = devm_clk_get(dev, "usb_extal"); |
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if (!IS_ERR(clk) && !clk_prepare_enable(clk)) { |
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r->usb_extal = !!clk_get_rate(clk); |
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clk_disable_unprepare(clk); |
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} |
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if (!r->usb3s_clk && !r->usb_extal) { |
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dev_err(dev, "This driver needs usb3s_clk and/or usb_extal\n"); |
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ret = -EINVAL; |
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goto error; |
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} |
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/* |
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* devm_phy_create() will call pm_runtime_enable(&phy->dev); |
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* And then, phy-core will manage runtime pm for this device. |
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*/ |
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pm_runtime_enable(dev); |
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r->phy = devm_phy_create(dev, NULL, &rcar_gen3_phy_usb3_ops); |
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if (IS_ERR(r->phy)) { |
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dev_err(dev, "Failed to create USB3 PHY\n"); |
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ret = PTR_ERR(r->phy); |
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goto error; |
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} |
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of_property_read_u32(dev->of_node, "renesas,ssc-range", &r->ssc_range); |
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platform_set_drvdata(pdev, r); |
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phy_set_drvdata(r->phy, r); |
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provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate); |
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if (IS_ERR(provider)) { |
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dev_err(dev, "Failed to register PHY provider\n"); |
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ret = PTR_ERR(provider); |
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goto error; |
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} |
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return 0; |
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error: |
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pm_runtime_disable(dev); |
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return ret; |
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} |
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static int rcar_gen3_phy_usb3_remove(struct platform_device *pdev) |
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{ |
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pm_runtime_disable(&pdev->dev); |
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return 0; |
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}; |
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static struct platform_driver rcar_gen3_phy_usb3_driver = { |
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.driver = { |
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.name = "phy_rcar_gen3_usb3", |
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.of_match_table = rcar_gen3_phy_usb3_match_table, |
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}, |
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.probe = rcar_gen3_phy_usb3_probe, |
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.remove = rcar_gen3_phy_usb3_remove, |
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}; |
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module_platform_driver(rcar_gen3_phy_usb3_driver); |
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MODULE_LICENSE("GPL v2"); |
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MODULE_DESCRIPTION("Renesas R-Car Gen3 USB 3.0 PHY"); |
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MODULE_AUTHOR("Yoshihiro Shimoda <[email protected]>");
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