Release 4.7 drivers/phy/phy-miphy365x.c

/*
 * Copyright (C) 2014 STMicroelectronics – All Rights Reserved
 *
 * STMicroelectronics PHY driver MiPHY365 (for SoC STiH416).
 *
 * Authors: Alexandre Torgue <alexandre.torgue@st.com>
 *          Lee Jones <lee.jones@linaro.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2, as
 * published by the Free Software Foundation.
 *
 */

#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/of_address.h>
#include <linux/clk.h>
#include <linux/phy/phy.h>
#include <linux/delay.h>
#include <linux/mfd/syscon.h>
#include <linux/regmap.h>

#include <dt-bindings/phy/phy.h>


#define HFC_TIMEOUT		100


#define SYSCFG_SELECT_SATA_MASK	BIT(1)

#define SYSCFG_SELECT_SATA_POS	1

/* MiPHY365x register definitions */

#define RESET_REG		0x00

#define RST_PLL			BIT(1)

#define RST_PLL_CAL		BIT(2)

#define RST_RX			BIT(4)

#define RST_MACRO		BIT(7)


#define STATUS_REG		0x01

#define IDLL_RDY		BIT(0)

#define PLL_RDY			BIT(1)

#define DES_BIT_LOCK		BIT(2)

#define DES_SYMBOL_LOCK		BIT(3)


#define CTRL_REG		0x02

#define TERM_EN			BIT(0)

#define PCI_EN			BIT(2)

#define DES_BIT_LOCK_EN		BIT(3)

#define TX_POL			BIT(5)


#define INT_CTRL_REG		0x03


#define BOUNDARY1_REG		0x10

#define SPDSEL_SEL		BIT(0)


#define BOUNDARY3_REG		0x12

#define TX_SPDSEL_GEN1_VAL	0

#define TX_SPDSEL_GEN2_VAL	0x01

#define TX_SPDSEL_GEN3_VAL	0x02

#define RX_SPDSEL_GEN1_VAL	0

#define RX_SPDSEL_GEN2_VAL	(0x01 << 3)

#define RX_SPDSEL_GEN3_VAL	(0x02 << 3)


#define PCIE_REG		0x16


#define BUF_SEL_REG		0x20

#define CONF_GEN_SEL_GEN3	0x02

#define CONF_GEN_SEL_GEN2	0x01

#define PD_VDDTFILTER		BIT(4)


#define TXBUF1_REG		0x21

#define SWING_VAL		0x04

#define SWING_VAL_GEN1		0x03

#define PREEMPH_VAL		(0x3 << 5)


#define TXBUF2_REG		0x22

#define TXSLEW_VAL		0x2

#define TXSLEW_VAL_GEN1		0x4


#define RXBUF_OFFSET_CTRL_REG	0x23


#define RXBUF_REG		0x25

#define SDTHRES_VAL		0x01

#define EQ_ON3			(0x03 << 4)

#define EQ_ON1			(0x01 << 4)


#define COMP_CTRL1_REG		0x40

#define START_COMSR		BIT(0)

#define START_COMZC		BIT(1)

#define COMSR_DONE		BIT(2)

#define COMZC_DONE		BIT(3)

#define COMP_AUTO_LOAD		BIT(4)


#define COMP_CTRL2_REG		0x41

#define COMP_2MHZ_RAT_GEN1	0x1e

#define COMP_2MHZ_RAT		0xf


#define COMP_CTRL3_REG		0x42

#define COMSR_COMP_REF		0x33


#define COMP_IDLL_REG		0x47

#define COMZC_IDLL		0x2a


#define PLL_CTRL1_REG		0x50

#define PLL_START_CAL		BIT(0)

#define BUF_EN			BIT(2)

#define SYNCHRO_TX		BIT(3)

#define SSC_EN			BIT(6)

#define CONFIG_PLL		BIT(7)


#define PLL_CTRL2_REG		0x51

#define BYPASS_PLL_CAL		BIT(1)


#define PLL_RAT_REG		0x52


#define PLL_SSC_STEP_MSB_REG	0x56

#define PLL_SSC_STEP_MSB_VAL	0x03


#define PLL_SSC_STEP_LSB_REG	0x57

#define PLL_SSC_STEP_LSB_VAL	0x63


#define PLL_SSC_PER_MSB_REG	0x58

#define PLL_SSC_PER_MSB_VAL	0


#define PLL_SSC_PER_LSB_REG	0x59

#define PLL_SSC_PER_LSB_VAL	0xf1


#define IDLL_TEST_REG		0x72

#define START_CLK_HF		BIT(6)


#define DES_BITLOCK_REG		0x86

#define BIT_LOCK_LEVEL		0x01

#define BIT_LOCK_CNT_512	(0x03 << 5)


struct miphy365x_phy {
	
struct phy *phy;
	
void __iomem *base;
	
bool pcie_tx_pol_inv;
	
bool sata_tx_pol_inv;
	
u32 sata_gen;
	
u32 ctrlreg;
	
u8 type;
};


struct miphy365x_dev {
	
struct device *dev;
	
struct regmap *regmap;
	
struct mutex miphy_mutex;
	
struct miphy365x_phy **phys;
	
int nphys;
};

/*
 * These values are represented in Device tree. They are considered to be ABI
 * and although they can be extended any existing values must not change.
 */

enum miphy_sata_gen {
	
SATA_GEN1 = 1,
	
SATA_GEN2,
	
SATA_GEN3
};


static u8 rx_tx_spd[] = {
	0, /* GEN0 doesn't exist. */
	TX_SPDSEL_GEN1_VAL | RX_SPDSEL_GEN1_VAL,
	TX_SPDSEL_GEN2_VAL | RX_SPDSEL_GEN2_VAL,
	TX_SPDSEL_GEN3_VAL | RX_SPDSEL_GEN3_VAL
};

/*
 * This function selects the system configuration,
 * either two SATA, one SATA and one PCIe, or two PCIe lanes.
 */


static int miphy365x_set_path(struct miphy365x_phy *miphy_phy,
			      struct miphy365x_dev *miphy_dev)
{
	bool sata = (miphy_phy->type == PHY_TYPE_SATA);

	return regmap_update_bits(miphy_dev->regmap,
				  miphy_phy->ctrlreg,
				  SYSCFG_SELECT_SATA_MASK,
				  sata << SYSCFG_SELECT_SATA_POS);
}

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static int miphy365x_init_pcie_port(struct miphy365x_phy *miphy_phy,
				    struct miphy365x_dev *miphy_dev)
{
	u8 val;

	if (miphy_phy->pcie_tx_pol_inv) {
		/* Invert Tx polarity and clear pci_txdetect_pol bit */
		val = TERM_EN | PCI_EN | DES_BIT_LOCK_EN | TX_POL;
		writeb_relaxed(val, miphy_phy->base + CTRL_REG);
		writeb_relaxed(0x00, miphy_phy->base + PCIE_REG);
	}

	return 0;
}

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static inline int miphy365x_hfc_not_rdy(struct miphy365x_phy *miphy_phy,
					struct miphy365x_dev *miphy_dev)
{
	unsigned long timeout = jiffies + msecs_to_jiffies(HFC_TIMEOUT);
	u8 mask = IDLL_RDY | PLL_RDY;
	u8 regval;

	do {
		regval = readb_relaxed(miphy_phy->base + STATUS_REG);
		if (!(regval & mask))
			return 0;

		usleep_range(2000, 2500);
	} while (time_before(jiffies, timeout));

	dev_err(miphy_dev->dev, "HFC ready timeout!\n");
	return -EBUSY;
}

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static inline int miphy365x_rdy(struct miphy365x_phy *miphy_phy,
				struct miphy365x_dev *miphy_dev)
{
	unsigned long timeout = jiffies + msecs_to_jiffies(HFC_TIMEOUT);
	u8 mask = IDLL_RDY | PLL_RDY;
	u8 regval;

	do {
		regval = readb_relaxed(miphy_phy->base + STATUS_REG);
		if ((regval & mask) == mask)
			return 0;

		usleep_range(2000, 2500);
	} while (time_before(jiffies, timeout));

	dev_err(miphy_dev->dev, "PHY not ready timeout!\n");
	return -EBUSY;
}

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static inline void miphy365x_set_comp(struct miphy365x_phy *miphy_phy,
				      struct miphy365x_dev *miphy_dev)
{
	u8 val, mask;

	if (miphy_phy->sata_gen == SATA_GEN1)
		writeb_relaxed(COMP_2MHZ_RAT_GEN1,
			       miphy_phy->base + COMP_CTRL2_REG);
	else
		writeb_relaxed(COMP_2MHZ_RAT,
			       miphy_phy->base + COMP_CTRL2_REG);

	if (miphy_phy->sata_gen != SATA_GEN3) {
		writeb_relaxed(COMSR_COMP_REF,
			       miphy_phy->base + COMP_CTRL3_REG);
		/*
                 * Force VCO current to value defined by address 0x5A
                 * and disable PCIe100Mref bit
                 * Enable auto load compensation for pll_i_bias
                 */
		writeb_relaxed(BYPASS_PLL_CAL, miphy_phy->base + PLL_CTRL2_REG);
		writeb_relaxed(COMZC_IDLL, miphy_phy->base + COMP_IDLL_REG);
	}

	/*
         * Force restart compensation and enable auto load
         * for Comzc_Tx, Comzc_Rx and Comsr on macro
         */
	val = START_COMSR | START_COMZC | COMP_AUTO_LOAD;
	writeb_relaxed(val, miphy_phy->base + COMP_CTRL1_REG);

	mask = COMSR_DONE | COMZC_DONE;
	while ((readb_relaxed(miphy_phy->base + COMP_CTRL1_REG) & mask)	!= mask)
		cpu_relax();
}

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static inline void miphy365x_set_ssc(struct miphy365x_phy *miphy_phy,
				     struct miphy365x_dev *miphy_dev)
{
	u8 val;

	/*
         * SSC Settings. SSC will be enabled through Link
         * SSC Ampl. = 0.4%
         * SSC Freq = 31KHz
         */
	writeb_relaxed(PLL_SSC_STEP_MSB_VAL,
		       miphy_phy->base + PLL_SSC_STEP_MSB_REG);
	writeb_relaxed(PLL_SSC_STEP_LSB_VAL,
		       miphy_phy->base + PLL_SSC_STEP_LSB_REG);
	writeb_relaxed(PLL_SSC_PER_MSB_VAL,
		       miphy_phy->base + PLL_SSC_PER_MSB_REG);
	writeb_relaxed(PLL_SSC_PER_LSB_VAL,
		       miphy_phy->base + PLL_SSC_PER_LSB_REG);

	/* SSC Settings complete */
	if (miphy_phy->sata_gen == SATA_GEN1) {
		val = PLL_START_CAL | BUF_EN | SYNCHRO_TX | CONFIG_PLL;
		writeb_relaxed(val, miphy_phy->base + PLL_CTRL1_REG);
	} else {
		val = SSC_EN | PLL_START_CAL | BUF_EN | SYNCHRO_TX | CONFIG_PLL;
		writeb_relaxed(val, miphy_phy->base + PLL_CTRL1_REG);
	}
}

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static int miphy365x_init_sata_port(struct miphy365x_phy *miphy_phy,
				    struct miphy365x_dev *miphy_dev)
{
	int ret;
	u8 val;

	/*
         * Force PHY macro reset, PLL calibration reset, PLL reset
         * and assert Deserializer Reset
         */
	val = RST_PLL | RST_PLL_CAL | RST_RX | RST_MACRO;
	writeb_relaxed(val, miphy_phy->base + RESET_REG);

	if (miphy_phy->sata_tx_pol_inv)
		writeb_relaxed(TX_POL, miphy_phy->base + CTRL_REG);

	/*
         * Force macro1 to use rx_lspd, tx_lspd
         * Force Rx_Clock on first I-DLL phase
         * Force Des in HP mode on macro, rx_lspd, tx_lspd for Gen2/3
         */
	writeb_relaxed(SPDSEL_SEL, miphy_phy->base + BOUNDARY1_REG);
	writeb_relaxed(START_CLK_HF, miphy_phy->base + IDLL_TEST_REG);
	val = rx_tx_spd[miphy_phy->sata_gen];
	writeb_relaxed(val, miphy_phy->base + BOUNDARY3_REG);

	/* Wait for HFC_READY = 0 */
	ret = miphy365x_hfc_not_rdy(miphy_phy, miphy_dev);
	if (ret)
		return ret;

	/* Compensation Recalibration */
	miphy365x_set_comp(miphy_phy, miphy_dev);

	switch (miphy_phy->sata_gen) {
	case SATA_GEN3:
		/*
                 * TX Swing target 550-600mv peak to peak diff
                 * Tx Slew target 90-110ps rising/falling time
                 * Rx Eq ON3, Sigdet threshold SDTH1
                 */
		val = PD_VDDTFILTER | CONF_GEN_SEL_GEN3;
		writeb_relaxed(val, miphy_phy->base + BUF_SEL_REG);
		val = SWING_VAL | PREEMPH_VAL;
		writeb_relaxed(val, miphy_phy->base + TXBUF1_REG);
		writeb_relaxed(TXSLEW_VAL, miphy_phy->base + TXBUF2_REG);
		writeb_relaxed(0x00, miphy_phy->base + RXBUF_OFFSET_CTRL_REG);
		val = SDTHRES_VAL | EQ_ON3;
		writeb_relaxed(val, miphy_phy->base + RXBUF_REG);
		break;
	case SATA_GEN2:
		/*
                 * conf gen sel=0x1 to program Gen2 banked registers
                 * VDDT filter ON
                 * Tx Swing target 550-600mV peak-to-peak diff
                 * Tx Slew target 90-110 ps rising/falling time
                 * RX Equalization ON1, Sigdet threshold SDTH1
                 */
		writeb_relaxed(CONF_GEN_SEL_GEN2,
			       miphy_phy->base + BUF_SEL_REG);
		writeb_relaxed(SWING_VAL, miphy_phy->base + TXBUF1_REG);
		writeb_relaxed(TXSLEW_VAL, miphy_phy->base + TXBUF2_REG);
		val = SDTHRES_VAL | EQ_ON1;
		writeb_relaxed(val, miphy_phy->base + RXBUF_REG);
		break;
	case SATA_GEN1:
		/*
                 * conf gen sel = 00b to program Gen1 banked registers
                 * VDDT filter ON
                 * Tx Swing target 500-550mV peak-to-peak diff
                 * Tx Slew target120-140 ps rising/falling time
                 */
		writeb_relaxed(PD_VDDTFILTER, miphy_phy->base + BUF_SEL_REG);
		writeb_relaxed(SWING_VAL_GEN1, miphy_phy->base + TXBUF1_REG);
		writeb_relaxed(TXSLEW_VAL_GEN1,	miphy_phy->base + TXBUF2_REG);
		break;
	default:
		break;
	}

	/* Force Macro1 in partial mode & release pll cal reset */
	writeb_relaxed(RST_RX, miphy_phy->base + RESET_REG);
	usleep_range(100, 150);

	miphy365x_set_ssc(miphy_phy, miphy_dev);

	/* Wait for phy_ready */
	ret = miphy365x_rdy(miphy_phy, miphy_dev);
	if (ret)
		return ret;

	/*
         * Enable macro1 to use rx_lspd & tx_lspd
         * Release Rx_Clock on first I-DLL phase on macro1
         * Assert deserializer reset
         * des_bit_lock_en is set
         * bit lock detection strength
         * Deassert deserializer reset
         */
	writeb_relaxed(0x00, miphy_phy->base + BOUNDARY1_REG);
	writeb_relaxed(0x00, miphy_phy->base + IDLL_TEST_REG);
	writeb_relaxed(RST_RX, miphy_phy->base + RESET_REG);
	val = miphy_phy->sata_tx_pol_inv ?
		(TX_POL | DES_BIT_LOCK_EN) : DES_BIT_LOCK_EN;
	writeb_relaxed(val, miphy_phy->base + CTRL_REG);

	val = BIT_LOCK_CNT_512 | BIT_LOCK_LEVEL;
	writeb_relaxed(val, miphy_phy->base + DES_BITLOCK_REG);
	writeb_relaxed(0x00, miphy_phy->base + RESET_REG);

	return 0;
}

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static int miphy365x_init(struct phy *phy)
{
	struct miphy365x_phy *miphy_phy = phy_get_drvdata(phy);
	struct miphy365x_dev *miphy_dev = dev_get_drvdata(phy->dev.parent);
	int ret = 0;

	mutex_lock(&miphy_dev->miphy_mutex);

	ret = miphy365x_set_path(miphy_phy, miphy_dev);
	if (ret) {
		mutex_unlock(&miphy_dev->miphy_mutex);
		return ret;
	}

	/* Initialise Miphy for PCIe or SATA */
	if (miphy_phy->type == PHY_TYPE_PCIE)
		ret = miphy365x_init_pcie_port(miphy_phy, miphy_dev);
	else
		ret = miphy365x_init_sata_port(miphy_phy, miphy_dev);

	mutex_unlock(&miphy_dev->miphy_mutex);

	return ret;
}

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static int miphy365x_get_addr(struct device *dev,
		struct miphy365x_phy *miphy_phy, int index)
{
	struct device_node *phynode = miphy_phy->phy->dev.of_node;
	const char *name;
	int type = miphy_phy->type;
	int ret;

	ret = of_property_read_string_index(phynode, "reg-names", index, &name);
	if (ret) {
		dev_err(dev, "no reg-names property not found\n");
		return ret;
	}

	if (!((!strncmp(name, "sata", 4) && type == PHY_TYPE_SATA) ||
	      (!strncmp(name, "pcie", 4) && type == PHY_TYPE_PCIE)))
		return 0;

	miphy_phy->base = of_iomap(phynode, index);
	if (!miphy_phy->base) {
		dev_err(dev, "Failed to map %s\n", phynode->full_name);
		return -EINVAL;
	}

	return 0;
}

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static struct phy *miphy365x_xlate(struct device *dev,
				   struct of_phandle_args *args)
{
	struct miphy365x_dev *miphy_dev = dev_get_drvdata(dev);
	struct miphy365x_phy *miphy_phy = NULL;
	struct device_node *phynode = args->np;
	int ret, index;

	if (args->args_count != 1) {
		dev_err(dev, "Invalid number of cells in 'phy' property\n");
		return ERR_PTR(-EINVAL);
	}

	for (index = 0; index < miphy_dev->nphys; index++)
		if (phynode == miphy_dev->phys[index]->phy->dev.of_node) {
			miphy_phy = miphy_dev->phys[index];
			break;
		}

	if (!miphy_phy) {
		dev_err(dev, "Failed to find appropriate phy\n");
		return ERR_PTR(-EINVAL);
	}

	miphy_phy->type = args->args[0];

	if (!(miphy_phy->type == PHY_TYPE_SATA ||
	      miphy_phy->type == PHY_TYPE_PCIE)) {
		dev_err(dev, "Unsupported device type: %d\n", miphy_phy->type);
		return ERR_PTR(-EINVAL);
	}

	/* Each port handles SATA and PCIE - third entry is always sysconf. */
	for (index = 0; index < 3; index++) {
		ret = miphy365x_get_addr(dev, miphy_phy, index);
		if (ret < 0)
			return ERR_PTR(ret);
	}

	return miphy_phy->phy;
}

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static const struct phy_ops miphy365x_ops = {
	.init		= miphy365x_init,
	.owner		= THIS_MODULE,
};



static int miphy365x_of_probe(struct device_node *phynode,
			      struct miphy365x_phy *miphy_phy)
{
	of_property_read_u32(phynode, "st,sata-gen", &miphy_phy->sata_gen);
	if (!miphy_phy->sata_gen)
		miphy_phy->sata_gen = SATA_GEN1;

	miphy_phy->pcie_tx_pol_inv =
		of_property_read_bool(phynode, "st,pcie-tx-pol-inv");

	miphy_phy->sata_tx_pol_inv =
		of_property_read_bool(phynode, "st,sata-tx-pol-inv");

	return 0;
}

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static int miphy365x_probe(struct platform_device *pdev)
{
	struct device_node *child, *np = pdev->dev.of_node;
	struct miphy365x_dev *miphy_dev;
	struct phy_provider *provider;
	struct phy *phy;
	int ret, port = 0;

	miphy_dev = devm_kzalloc(&pdev->dev, sizeof(*miphy_dev), GFP_KERNEL);
	if (!miphy_dev)
		return -ENOMEM;

	miphy_dev->nphys = of_get_child_count(np);
	miphy_dev->phys = devm_kcalloc(&pdev->dev, miphy_dev->nphys,
				       sizeof(*miphy_dev->phys), GFP_KERNEL);
	if (!miphy_dev->phys)
		return -ENOMEM;

	miphy_dev->regmap = syscon_regmap_lookup_by_phandle(np, "st,syscfg");
	if (IS_ERR(miphy_dev->regmap)) {
		dev_err(miphy_dev->dev, "No syscfg phandle specified\n");
		return PTR_ERR(miphy_dev->regmap);
	}

	miphy_dev->dev = &pdev->dev;

	dev_set_drvdata(&pdev->dev, miphy_dev);

	mutex_init(&miphy_dev->miphy_mutex);

	for_each_child_of_node(np, child) {
		struct miphy365x_phy *miphy_phy;

		miphy_phy = devm_kzalloc(&pdev->dev, sizeof(*miphy_phy),
					 GFP_KERNEL);
		if (!miphy_phy) {
			ret = -ENOMEM;
			goto put_child;
		}

		miphy_dev->phys[port] = miphy_phy;

		phy = devm_phy_create(&pdev->dev, child, &miphy365x_ops);
		if (IS_ERR(phy)) {
			dev_err(&pdev->dev, "failed to create PHY\n");
			ret = PTR_ERR(phy);
			goto put_child;
		}

		miphy_dev->phys[port]->phy = phy;

		ret = miphy365x_of_probe(child, miphy_phy);
		if (ret)
			goto put_child;

		phy_set_drvdata(phy, miphy_dev->phys[port]);

		port++;
		/* sysconfig offsets are indexed from 1 */
		ret = of_property_read_u32_index(np, "st,syscfg", port,
					&miphy_phy->ctrlreg);
		if (ret) {
			dev_err(&pdev->dev, "No sysconfig offset found\n");
			goto put_child;
		}
	}

	provider = devm_of_phy_provider_register(&pdev->dev, miphy365x_xlate);
	return PTR_ERR_OR_ZERO(provider);
put_child:
	of_node_put(child);
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
lee jones
lee jones
314
80.31%
2
28.57%
peter griffin
peter griffin
33
8.44%
1
14.29%
julia lawall
julia lawall
30
7.67%
1
14.29%
axel lin
axel lin
13
3.32%
2
28.57%
gregory clement
gregory clement
1
0.26%
1
14.29%
Total
391
100.00%
7
100.00%


static const struct of_device_id miphy365x_of_match[] = {
	{ .compatible = "st,miphy365x-phy", },
	{ },
};
MODULE_DEVICE_TABLE(of, miphy365x_of_match);


static struct platform_driver miphy365x_driver = {
	.probe	= miphy365x_probe,
	.driver = {
		.name	= "miphy365x-phy",
		.of_match_table	= miphy365x_of_match,
        }
};

module_platform_driver(miphy365x_driver);

MODULE_AUTHOR("Alexandre Torgue <alexandre.torgue@st.com>");
MODULE_DESCRIPTION("STMicroelectronics miphy365x driver");
MODULE_LICENSE("GPL v2");
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
lee jones
lee jones
2414
96.33%
3
27.27%
peter griffin
peter griffin
41
1.64%
2
18.18%
julia lawall
julia lawall
30
1.20%
1
9.09%
axel lin
axel lin
19
0.76%
3
27.27%
gregory clement
gregory clement
1
0.04%
1
9.09%
felipe balbi
felipe balbi
1
0.04%
1
9.09%
Total
2506
100.00%
11
100.00%
  
Directory: drivers/phy

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