phy: add driver for TI TUSB1210 ULPI PHY (1c14905e) · Commits · 戴 / test

drivers/phy/Kconfig

+7 −0

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		@@ -309,4 +309,11 @@ config PHY_QCOM_UFS
		help
		Support for UFS PHY on QCOM chipsets.

		config PHY_TUSB1210
		tristate "TI TUSB1210 ULPI PHY module"
		depends on USB_ULPI_BUS
		select GENERIC_PHY
		help
		Support for TI TUSB1210 USB ULPI PHY.

		endmenu

drivers/phy/Makefile

+1 −0

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		@@ -40,3 +40,4 @@ obj-$(CONFIG_PHY_STIH41X_USB) += phy-stih41x-usb.o
		obj-$(CONFIG_PHY_QCOM_UFS) += phy-qcom-ufs.o
		obj-$(CONFIG_PHY_QCOM_UFS) += phy-qcom-ufs-qmp-20nm.o
		obj-$(CONFIG_PHY_QCOM_UFS) += phy-qcom-ufs-qmp-14nm.o
		obj-$(CONFIG_PHY_TUSB1210) += phy-tusb1210.o

drivers/phy/phy-tusb1210.c

0 → 100644

+153 −0

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		/**
		* tusb1210.c - TUSB1210 USB ULPI PHY driver
		*
		* Copyright (C) 2015 Intel Corporation
		*
		* Author: Heikki Krogerus <heikki.krogerus@linux.intel.com>
		*
		* 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/module.h>
		#include <linux/ulpi/driver.h>
		#include <linux/gpio/consumer.h>

		#include "ulpi_phy.h"

		#define TUSB1210_VENDOR_SPECIFIC2 0x80
		#define TUSB1210_VENDOR_SPECIFIC2_IHSTX_SHIFT 0
		#define TUSB1210_VENDOR_SPECIFIC2_ZHSDRV_SHIFT 4
		#define TUSB1210_VENDOR_SPECIFIC2_DP_SHIFT 6

		struct tusb1210 {
		struct ulpi *ulpi;
		struct phy *phy;
		struct gpio_desc *gpio_reset;
		struct gpio_desc *gpio_cs;
		u8 vendor_specific2;
		};

		static int tusb1210_power_on(struct phy *phy)
		{
		struct tusb1210 *tusb = phy_get_drvdata(phy);

		gpiod_set_value_cansleep(tusb->gpio_reset, 1);
		gpiod_set_value_cansleep(tusb->gpio_cs, 1);

		/* Restore the optional eye diagram optimization value */
		if (tusb->vendor_specific2)
		ulpi_write(tusb->ulpi, TUSB1210_VENDOR_SPECIFIC2,
		tusb->vendor_specific2);

		return 0;
		}

		static int tusb1210_power_off(struct phy *phy)
		{
		struct tusb1210 *tusb = phy_get_drvdata(phy);

		gpiod_set_value_cansleep(tusb->gpio_reset, 0);
		gpiod_set_value_cansleep(tusb->gpio_cs, 0);

		return 0;
		}

		static struct phy_ops phy_ops = {
		.power_on = tusb1210_power_on,
		.power_off = tusb1210_power_off,
		.owner = THIS_MODULE,
		};

		static int tusb1210_probe(struct ulpi *ulpi)
		{
		struct gpio_desc *gpio;
		struct tusb1210 *tusb;
		u8 val, reg;
		int ret;

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

		gpio = devm_gpiod_get(&ulpi->dev, "reset");
		if (!IS_ERR(gpio)) {
		ret = gpiod_direction_output(gpio, 0);
		if (ret)
		return ret;
		gpiod_set_value_cansleep(gpio, 1);
		tusb->gpio_reset = gpio;
		}

		gpio = devm_gpiod_get(&ulpi->dev, "cs");
		if (!IS_ERR(gpio)) {
		ret = gpiod_direction_output(gpio, 0);
		if (ret)
		return ret;
		gpiod_set_value_cansleep(gpio, 1);
		tusb->gpio_cs = gpio;
		}

		/*
		* VENDOR_SPECIFIC2 register in TUSB1210 can be used for configuring eye
		* diagram optimization and DP/DM swap.
		*/

		/* High speed output drive strength configuration */
		device_property_read_u8(&ulpi->dev, "ihstx", &val);
		reg = val << TUSB1210_VENDOR_SPECIFIC2_IHSTX_SHIFT;

		/* High speed output impedance configuration */
		device_property_read_u8(&ulpi->dev, "zhsdrv", &val);
		reg \|= val << TUSB1210_VENDOR_SPECIFIC2_ZHSDRV_SHIFT;

		/* DP/DM swap control */
		device_property_read_u8(&ulpi->dev, "datapolarity", &val);
		reg \|= val << TUSB1210_VENDOR_SPECIFIC2_DP_SHIFT;

		if (reg) {
		ulpi_write(ulpi, TUSB1210_VENDOR_SPECIFIC2, reg);
		tusb->vendor_specific2 = reg;
		}

		tusb->phy = ulpi_phy_create(ulpi, &phy_ops);
		if (IS_ERR(tusb->phy))
		return PTR_ERR(tusb->phy);

		tusb->ulpi = ulpi;

		phy_set_drvdata(tusb->phy, tusb);
		ulpi_set_drvdata(ulpi, tusb);
		return 0;
		}

		static void tusb1210_remove(struct ulpi *ulpi)
		{
		struct tusb1210 *tusb = ulpi_get_drvdata(ulpi);

		ulpi_phy_destroy(ulpi, tusb->phy);
		}

		#define TI_VENDOR_ID 0x0451

		static const struct ulpi_device_id tusb1210_ulpi_id[] = {
		{ TI_VENDOR_ID, 0x1507, },
		{ },
		};
		MODULE_DEVICE_TABLE(ulpi, tusb1210_ulpi_id);

		static struct ulpi_driver tusb1210_driver = {
		.id_table = tusb1210_ulpi_id,
		.probe = tusb1210_probe,
		.remove = tusb1210_remove,
		.driver = {
		.name = "tusb1210",
		.owner = THIS_MODULE,
		},
		};

		module_ulpi_driver(tusb1210_driver);

		MODULE_AUTHOR("Intel Corporation");
		MODULE_LICENSE("GPL v2");
		MODULE_DESCRIPTION("TUSB1210 ULPI PHY driver");

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