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Release 4.10 drivers/phy/phy-ti-pipe3.c

Directory: drivers/phy
/*
 * phy-ti-pipe3 - PIPE3 PHY driver.
 *
 * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * Author: Kishon Vijay Abraham I <kishon@ti.com>
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 */

#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/phy/phy.h>
#include <linux/of.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/pm_runtime.h>
#include <linux/delay.h>
#include <linux/phy/omap_control_phy.h>
#include <linux/of_platform.h>
#include <linux/mfd/syscon.h>
#include <linux/regmap.h>


#define	PLL_STATUS		0x00000004

#define	PLL_GO			0x00000008

#define	PLL_CONFIGURATION1	0x0000000C

#define	PLL_CONFIGURATION2	0x00000010

#define	PLL_CONFIGURATION3	0x00000014

#define	PLL_CONFIGURATION4	0x00000020


#define	PLL_REGM_MASK		0x001FFE00

#define	PLL_REGM_SHIFT		0x9

#define	PLL_REGM_F_MASK		0x0003FFFF

#define	PLL_REGM_F_SHIFT	0x0

#define	PLL_REGN_MASK		0x000001FE

#define	PLL_REGN_SHIFT		0x1

#define	PLL_SELFREQDCO_MASK	0x0000000E

#define	PLL_SELFREQDCO_SHIFT	0x1

#define	PLL_SD_MASK		0x0003FC00

#define	PLL_SD_SHIFT		10

#define	SET_PLL_GO		0x1

#define PLL_LDOPWDN		BIT(15)

#define PLL_TICOPWDN		BIT(16)

#define	PLL_LOCK		0x2

#define	PLL_IDLE		0x1


#define SATA_PLL_SOFT_RESET	BIT(18)


#define PIPE3_PHY_PWRCTL_CLK_CMD_MASK	0x003FC000

#define PIPE3_PHY_PWRCTL_CLK_CMD_SHIFT	14


#define PIPE3_PHY_PWRCTL_CLK_FREQ_MASK	0xFFC00000

#define PIPE3_PHY_PWRCTL_CLK_FREQ_SHIFT	22


#define PIPE3_PHY_TX_RX_POWERON		0x3

#define PIPE3_PHY_TX_RX_POWEROFF	0x0


#define PCIE_PCS_MASK			0xFF0000

#define PCIE_PCS_DELAY_COUNT_SHIFT	0x10

/*
 * This is an Empirical value that works, need to confirm the actual
 * value required for the PIPE3PHY_PLL_CONFIGURATION2.PLL_IDLE status
 * to be correctly reflected in the PIPE3PHY_PLL_STATUS register.
 */

#define PLL_IDLE_TIME	100	
/* in milliseconds */

#define PLL_LOCK_TIME	100	
/* in milliseconds */


struct pipe3_dpll_params {
	
u16	m;
	
u8	n;
	
u8	freq:3;
	
u8	sd;
	
u32	mf;
};


struct pipe3_dpll_map {
	
unsigned long rate;
	
struct pipe3_dpll_params params;
};


struct ti_pipe3 {
	
void __iomem		*pll_ctrl_base;
	
struct device		*dev;
	
struct device		*control_dev;
	
struct clk		*wkupclk;
	
struct clk		*sys_clk;
	
struct clk		*refclk;
	
struct clk		*div_clk;
	
struct pipe3_dpll_map	*dpll_map;
	
struct regmap		*phy_power_syscon; /* ctrl. reg. acces */
	
struct regmap		*pcs_syscon; /* ctrl. reg. acces */
	
struct regmap		*dpll_reset_syscon; /* ctrl. reg. acces */
	
unsigned int		dpll_reset_reg; /* reg. index within syscon */
	
unsigned int		power_reg; /* power reg. index within syscon */
	
unsigned int		pcie_pcs_reg; /* pcs reg. index in syscon */
	
bool			sata_refclk_enabled;
};


static struct pipe3_dpll_map dpll_map_usb[] = {
	{12000000, {1250, 5, 4, 20, 0} },	/* 12 MHz */
	{16800000, {3125, 20, 4, 20, 0} },	/* 16.8 MHz */
	{19200000, {1172, 8, 4, 20, 65537} },	/* 19.2 MHz */
	{20000000, {1000, 7, 4, 10, 0} },	/* 20 MHz */
	{26000000, {1250, 12, 4, 20, 0} },	/* 26 MHz */
	{38400000, {3125, 47, 4, 20, 92843} },	/* 38.4 MHz */
	{ },					/* Terminator */
};


static struct pipe3_dpll_map dpll_map_sata[] = {
	{12000000, {1000, 7, 4, 6, 0} },	/* 12 MHz */
	{16800000, {714, 7, 4, 6, 0} },		/* 16.8 MHz */
	{19200000, {625, 7, 4, 6, 0} },		/* 19.2 MHz */
	{20000000, {600, 7, 4, 6, 0} },		/* 20 MHz */
	{26000000, {461, 7, 4, 6, 0} },		/* 26 MHz */
	{38400000, {312, 7, 4, 6, 0} },		/* 38.4 MHz */
	{ },					/* Terminator */
};


static inline u32 ti_pipe3_readl(void __iomem *addr, unsigned offset) { return __raw_readl(addr + offset); }

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static inline void ti_pipe3_writel(void __iomem *addr, unsigned offset, u32 data) { __raw_writel(data, addr + offset); }

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static struct pipe3_dpll_params *ti_pipe3_get_dpll_params(struct ti_pipe3 *phy) { unsigned long rate; struct pipe3_dpll_map *dpll_map = phy->dpll_map; rate = clk_get_rate(phy->sys_clk); for (; dpll_map->rate; dpll_map++) { if (rate == dpll_map->rate) return &dpll_map->params; } dev_err(phy->dev, "No DPLL configuration for %lu Hz SYS CLK\n", rate); return NULL; }

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static int ti_pipe3_enable_clocks(struct ti_pipe3 *phy); static void ti_pipe3_disable_clocks(struct ti_pipe3 *phy);
static int ti_pipe3_power_off(struct phy *x) { u32 val; int ret; struct ti_pipe3 *phy = phy_get_drvdata(x); if (!phy->phy_power_syscon) { omap_control_phy_power(phy->control_dev, 0); return 0; } val = PIPE3_PHY_TX_RX_POWEROFF << PIPE3_PHY_PWRCTL_CLK_CMD_SHIFT; ret = regmap_update_bits(phy->phy_power_syscon, phy->power_reg, PIPE3_PHY_PWRCTL_CLK_CMD_MASK, val); return ret; }

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static int ti_pipe3_power_on(struct phy *x) { u32 val; u32 mask; int ret; unsigned long rate; struct ti_pipe3 *phy = phy_get_drvdata(x); if (!phy->phy_power_syscon) { omap_control_phy_power(phy->control_dev, 1); return 0; } rate = clk_get_rate(phy->sys_clk); if (!rate) { dev_err(phy->dev, "Invalid clock rate\n"); return -EINVAL; } rate = rate / 1000000; mask = OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_CMD_MASK | OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_FREQ_MASK; val = PIPE3_PHY_TX_RX_POWERON << PIPE3_PHY_PWRCTL_CLK_CMD_SHIFT; val |= rate << OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_FREQ_SHIFT; ret = regmap_update_bits(phy->phy_power_syscon, phy->power_reg, mask, val); return ret; }

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static int ti_pipe3_dpll_wait_lock(struct ti_pipe3 *phy) { u32 val; unsigned long timeout; timeout = jiffies + msecs_to_jiffies(PLL_LOCK_TIME); do { cpu_relax(); val = ti_pipe3_readl(phy->pll_ctrl_base, PLL_STATUS); if (val & PLL_LOCK) return 0; } while (!time_after(jiffies, timeout)); dev_err(phy->dev, "DPLL failed to lock\n"); return -EBUSY; }

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static int ti_pipe3_dpll_program(struct ti_pipe3 *phy) { u32 val; struct pipe3_dpll_params *dpll_params; dpll_params = ti_pipe3_get_dpll_params(phy); if (!dpll_params) return -EINVAL; val = ti_pipe3_readl(phy->pll_ctrl_base, PLL_CONFIGURATION1); val &= ~PLL_REGN_MASK; val |= dpll_params->n << PLL_REGN_SHIFT; ti_pipe3_writel(phy->pll_ctrl_base, PLL_CONFIGURATION1, val); val = ti_pipe3_readl(phy->pll_ctrl_base, PLL_CONFIGURATION2); val &= ~PLL_SELFREQDCO_MASK; val |= dpll_params->freq << PLL_SELFREQDCO_SHIFT; ti_pipe3_writel(phy->pll_ctrl_base, PLL_CONFIGURATION2, val); val = ti_pipe3_readl(phy->pll_ctrl_base, PLL_CONFIGURATION1); val &= ~PLL_REGM_MASK; val |= dpll_params->m << PLL_REGM_SHIFT; ti_pipe3_writel(phy->pll_ctrl_base, PLL_CONFIGURATION1, val); val = ti_pipe3_readl(phy->pll_ctrl_base, PLL_CONFIGURATION4); val &= ~PLL_REGM_F_MASK; val |= dpll_params->mf << PLL_REGM_F_SHIFT; ti_pipe3_writel(phy->pll_ctrl_base, PLL_CONFIGURATION4, val); val = ti_pipe3_readl(phy->pll_ctrl_base, PLL_CONFIGURATION3); val &= ~PLL_SD_MASK; val |= dpll_params->sd << PLL_SD_SHIFT; ti_pipe3_writel(phy->pll_ctrl_base, PLL_CONFIGURATION3, val); ti_pipe3_writel(phy->pll_ctrl_base, PLL_GO, SET_PLL_GO); return ti_pipe3_dpll_wait_lock(phy); }

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static int ti_pipe3_init(struct phy *x) { struct ti_pipe3 *phy = phy_get_drvdata(x); u32 val; int ret = 0; ti_pipe3_enable_clocks(phy); /* * Set pcie_pcs register to 0x96 for proper functioning of phy * as recommended in AM572x TRM SPRUHZ6, section 18.5.2.2, table * 18-1804. */ if (of_device_is_compatible(phy->dev->of_node, "ti,phy-pipe3-pcie")) { if (!phy->pcs_syscon) { omap_control_pcie_pcs(phy->control_dev, 0x96); return 0; } val = 0x96 << OMAP_CTRL_PCIE_PCS_DELAY_COUNT_SHIFT; ret = regmap_update_bits(phy->pcs_syscon, phy->pcie_pcs_reg, PCIE_PCS_MASK, val); return ret; } /* Bring it out of IDLE if it is IDLE */ val = ti_pipe3_readl(phy->pll_ctrl_base, PLL_CONFIGURATION2); if (val & PLL_IDLE) { val &= ~PLL_IDLE; ti_pipe3_writel(phy->pll_ctrl_base, PLL_CONFIGURATION2, val); ret = ti_pipe3_dpll_wait_lock(phy); } /* SATA has issues if re-programmed when locked */ val = ti_pipe3_readl(phy->pll_ctrl_base, PLL_STATUS); if ((val & PLL_LOCK) && of_device_is_compatible(phy->dev->of_node, "ti,phy-pipe3-sata")) return ret; /* Program the DPLL */ ret = ti_pipe3_dpll_program(phy); if (ret) { ti_pipe3_disable_clocks(phy); return -EINVAL; } return ret; }

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static int ti_pipe3_exit(struct phy *x) { struct ti_pipe3 *phy = phy_get_drvdata(x); u32 val; unsigned long timeout; /* If dpll_reset_syscon is not present we wont power down SATA DPLL * due to Errata i783 */ if (of_device_is_compatible(phy->dev->of_node, "ti,phy-pipe3-sata") && !phy->dpll_reset_syscon) return 0; /* PCIe doesn't have internal DPLL */ if (!of_device_is_compatible(phy->dev->of_node, "ti,phy-pipe3-pcie")) { /* Put DPLL in IDLE mode */ val = ti_pipe3_readl(phy->pll_ctrl_base, PLL_CONFIGURATION2); val |= PLL_IDLE; ti_pipe3_writel(phy->pll_ctrl_base, PLL_CONFIGURATION2, val); /* wait for LDO and Oscillator to power down */ timeout = jiffies + msecs_to_jiffies(PLL_IDLE_TIME); do { cpu_relax(); val = ti_pipe3_readl(phy->pll_ctrl_base, PLL_STATUS); if ((val & PLL_TICOPWDN) && (val & PLL_LDOPWDN)) break; } while (!time_after(jiffies, timeout)); if (!(val & PLL_TICOPWDN) || !(val & PLL_LDOPWDN)) { dev_err(phy->dev, "Failed to power down: PLL_STATUS 0x%x\n", val); return -EBUSY; } } /* i783: SATA needs control bit toggle after PLL unlock */ if (of_device_is_compatible(phy->dev->of_node, "ti,phy-pipe3-sata")) { regmap_update_bits(phy->dpll_reset_syscon, phy->dpll_reset_reg, SATA_PLL_SOFT_RESET, SATA_PLL_SOFT_RESET); regmap_update_bits(phy->dpll_reset_syscon, phy->dpll_reset_reg, SATA_PLL_SOFT_RESET, 0); } ti_pipe3_disable_clocks(phy); return 0; }

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static const struct phy_ops ops = { .init = ti_pipe3_init, .exit = ti_pipe3_exit, .power_on = ti_pipe3_power_on, .power_off = ti_pipe3_power_off, .owner = THIS_MODULE, }; static const struct of_device_id ti_pipe3_id_table[];
static int ti_pipe3_get_clk(struct ti_pipe3 *phy) { struct clk *clk; struct device *dev = phy->dev; struct device_node *node = dev->of_node; phy->refclk = devm_clk_get(dev, "refclk"); if (IS_ERR(phy->refclk)) { dev_err(dev, "unable to get refclk\n"); /* older DTBs have missing refclk in SATA PHY * so don't bail out in case of SATA PHY. */ if (!of_device_is_compatible(node, "ti,phy-pipe3-sata")) return PTR_ERR(phy->refclk); } if (!of_device_is_compatible(node, "ti,phy-pipe3-sata")) { phy->wkupclk = devm_clk_get(dev, "wkupclk"); if (IS_ERR(phy->wkupclk)) { dev_err(dev, "unable to get wkupclk\n"); return PTR_ERR(phy->wkupclk); } } else { phy->wkupclk = ERR_PTR(-ENODEV); } if (!of_device_is_compatible(node, "ti,phy-pipe3-pcie") || phy->phy_power_syscon) { phy->sys_clk = devm_clk_get(dev, "sysclk"); if (IS_ERR(phy->sys_clk)) { dev_err(dev, "unable to get sysclk\n"); return -EINVAL; } } if (of_device_is_compatible(node, "ti,phy-pipe3-pcie")) { clk = devm_clk_get(dev, "dpll_ref"); if (IS_ERR(clk)) { dev_err(dev, "unable to get dpll ref clk\n"); return PTR_ERR(clk); } clk_set_rate(clk, 1500000000); clk = devm_clk_get(dev, "dpll_ref_m2"); if (IS_ERR(clk)) { dev_err(dev, "unable to get dpll ref m2 clk\n"); return PTR_ERR(clk); } clk_set_rate(clk, 100000000); clk = devm_clk_get(dev, "phy-div"); if (IS_ERR(clk)) { dev_err(dev, "unable to get phy-div clk\n"); return PTR_ERR(clk); } clk_set_rate(clk, 100000000); phy->div_clk = devm_clk_get(dev, "div-clk"); if (IS_ERR(phy->div_clk)) { dev_err(dev, "unable to get div-clk\n"); return PTR_ERR(phy->div_clk); } } else { phy->div_clk = ERR_PTR(-ENODEV); } return 0; }

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static int ti_pipe3_get_sysctrl(struct ti_pipe3 *phy) { struct device *dev = phy->dev; struct device_node *node = dev->of_node; struct device_node *control_node; struct platform_device *control_pdev; phy->phy_power_syscon = syscon_regmap_lookup_by_phandle(node, "syscon-phy-power"); if (IS_ERR(phy->phy_power_syscon)) { dev_dbg(dev, "can't get syscon-phy-power, using control device\n"); phy->phy_power_syscon = NULL; } else { if (of_property_read_u32_index(node, "syscon-phy-power", 1, &phy->power_reg)) { dev_err(dev, "couldn't get power reg. offset\n"); return -EINVAL; } } if (!phy->phy_power_syscon) { control_node = of_parse_phandle(node, "ctrl-module", 0); if (!control_node) { dev_err(dev, "Failed to get control device phandle\n"); return -EINVAL; } control_pdev = of_find_device_by_node(control_node); if (!control_pdev) { dev_err(dev, "Failed to get control device\n"); return -EINVAL; } phy->control_dev = &control_pdev->dev; } if (of_device_is_compatible(node, "ti,phy-pipe3-pcie")) { phy->pcs_syscon = syscon_regmap_lookup_by_phandle(node, "syscon-pcs"); if (IS_ERR(phy->pcs_syscon)) { dev_dbg(dev, "can't get syscon-pcs, using omap control\n"); phy->pcs_syscon = NULL; } else { if (of_property_read_u32_index(node, "syscon-pcs", 1, &phy->pcie_pcs_reg)) { dev_err(dev, "couldn't get pcie pcs reg. offset\n"); return -EINVAL; } } } if (of_device_is_compatible(node, "ti,phy-pipe3-sata")) { phy->dpll_reset_syscon = syscon_regmap_lookup_by_phandle(node, "syscon-pllreset"); if (IS_ERR(phy->dpll_reset_syscon)) { dev_info(dev, "can't get syscon-pllreset, sata dpll won't idle\n"); phy->dpll_reset_syscon = NULL; } else { if (of_property_read_u32_index(node, "syscon-pllreset", 1, &phy->dpll_reset_reg)) { dev_err(dev, "couldn't get pllreset reg. offset\n"); return -EINVAL; } } } return 0; }

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static int ti_pipe3_get_pll_base(struct ti_pipe3 *phy) { struct resource *res; const struct of_device_id *match; struct device *dev = phy->dev; struct device_node *node = dev->of_node; struct platform_device *pdev = to_platform_device(dev); if (of_device_is_compatible(node, "ti,phy-pipe3-pcie")) return 0; match = of_match_device(ti_pipe3_id_table, dev); if (!match) return -EINVAL; phy->dpll_map = (struct pipe3_dpll_map *)match->data; if (!phy->dpll_map) { dev_err(dev, "no DPLL data\n"); return -EINVAL; } res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pll_ctrl"); phy->pll_ctrl_base = devm_ioremap_resource(dev, res); return PTR_ERR_OR_ZERO(phy->pll_ctrl_base); }

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static int ti_pipe3_probe(struct platform_device *pdev) { struct ti_pipe3 *phy; struct phy *generic_phy; struct phy_provider *phy_provider; struct device_node *node = pdev->dev.of_node; struct device *dev = &pdev->dev; int ret; phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL); if (!phy) return -ENOMEM; phy->dev = dev; ret = ti_pipe3_get_pll_base(phy); if (ret) return ret; ret = ti_pipe3_get_sysctrl(phy); if (ret) return ret; ret = ti_pipe3_get_clk(phy); if (ret) return ret; platform_set_drvdata(pdev, phy); pm_runtime_enable(dev); /* * Prevent auto-disable of refclk for SATA PHY due to Errata i783 */ if (of_device_is_compatible(node, "ti,phy-pipe3-sata")) { if (!IS_ERR(phy->refclk)) { clk_prepare_enable(phy->refclk); phy->sata_refclk_enabled = true; } } generic_phy = devm_phy_create(dev, NULL, &ops); if (IS_ERR(generic_phy)) return PTR_ERR(generic_phy); phy_set_drvdata(generic_phy, phy); ti_pipe3_power_off(generic_phy); phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate); return PTR_ERR_OR_ZERO(phy_provider); }

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static int ti_pipe3_remove(struct platform_device *pdev) { pm_runtime_disable(&pdev->dev); return 0; }

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static int ti_pipe3_enable_clocks(struct ti_pipe3 *phy) { int ret = 0; if (!IS_ERR(phy->refclk)) { ret = clk_prepare_enable(phy->refclk); if (ret) { dev_err(phy->dev, "Failed to enable refclk %d\n", ret); return ret; } } if (!IS_ERR(phy->wkupclk)) { ret = clk_prepare_enable(phy->wkupclk); if (ret) { dev_err(phy->dev, "Failed to enable wkupclk %d\n", ret); goto disable_refclk; } } if (!IS_ERR(phy->div_clk)) { ret = clk_prepare_enable(phy->div_clk); if (ret) { dev_err(phy->dev, "Failed to enable div_clk %d\n", ret); goto disable_wkupclk; } } return 0; disable_wkupclk: if (!IS_ERR(phy->wkupclk)) clk_disable_unprepare(phy->wkupclk); disable_refclk: if (!IS_ERR(phy->refclk)) clk_disable_unprepare(phy->refclk); return ret; }

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static void ti_pipe3_disable_clocks(struct ti_pipe3 *phy) { if (!IS_ERR(phy->wkupclk)) clk_disable_unprepare(phy->wkupclk); if (!IS_ERR(phy->refclk)) { clk_disable_unprepare(phy->refclk); /* * SATA refclk needs an additional disable as we left it * on in probe to avoid Errata i783 */ if (phy->sata_refclk_enabled) { clk_disable_unprepare(phy->refclk); phy->sata_refclk_enabled = false; } } if (!IS_ERR(phy->div_clk)) clk_disable_unprepare(phy->div_clk); }

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static const struct of_device_id ti_pipe3_id_table[] = { { .compatible = "ti,phy-usb3", .data = dpll_map_usb, }, { .compatible = "ti,omap-usb3", .data = dpll_map_usb, }, { .compatible = "ti,phy-pipe3-sata", .data = dpll_map_sata, }, { .compatible = "ti,phy-pipe3-pcie", }, {} }; MODULE_DEVICE_TABLE(of, ti_pipe3_id_table); static struct platform_driver ti_pipe3_driver = { .probe = ti_pipe3_probe, .remove = ti_pipe3_remove, .driver = { .name = "ti-pipe3", .of_match_table = ti_pipe3_id_table, }, }; module_platform_driver(ti_pipe3_driver); MODULE_ALIAS("platform:ti_pipe3"); MODULE_AUTHOR("Texas Instruments Inc."); MODULE_DESCRIPTION("TI PIPE3 phy driver"); MODULE_LICENSE("GPL v2");

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Directory: drivers/phy
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