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// SPDX-License-Identifier: GPL-2.0-only
/*
* Driver for onboard USB hubs
*
* Copyright (C) 2022, STMicroelectronics - All Rights Reserved
*
* Mostly inspired by Linux kernel v6.1 onboard_usb_hub driver
*/
#include <asm/gpio.h>
#include <dm.h>
#include <dm/device_compat.h>
#include <linux/delay.h>
#include <power/regulator.h>
struct onboard_hub {
struct udevice *vdd;
struct gpio_desc *reset_gpio;
};
struct onboard_hub_data {
unsigned long reset_us;
unsigned long power_on_delay_us;
};
int usb_onboard_hub_reset(struct udevice *dev)
{
struct onboard_hub_data *data =
(struct onboard_hub_data *)dev_get_driver_data(dev);
struct onboard_hub *hub = dev_get_priv(dev);
int ret;
hub->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_IS_OUT);
/* property is optional, don't return error! */
if (!hub->reset_gpio)
return 0;
ret = dm_gpio_set_value(hub->reset_gpio, 1);
if (ret)
return ret;
udelay(data->reset_us);
ret = dm_gpio_set_value(hub->reset_gpio, 0);
if (ret)
return ret;
udelay(data->power_on_delay_us);
return 0;
}
static int usb_onboard_hub_probe(struct udevice *dev)
{
struct onboard_hub *hub = dev_get_priv(dev);
int ret;
ret = device_get_supply_regulator(dev, "vdd-supply", &hub->vdd);
if (ret) {
dev_err(dev, "can't get vdd-supply: %d\n", ret);
return ret;
}
ret = regulator_set_enable_if_allowed(hub->vdd, true);
if (ret)
dev_err(dev, "can't enable vdd-supply: %d\n", ret);
return usb_onboard_hub_reset(dev);
}
static int usb_onboard_hub_remove(struct udevice *dev)
{
struct onboard_hub *hub = dev_get_priv(dev);
int ret;
if (hub->reset_gpio)
dm_gpio_free(hub->reset_gpio->dev, hub->reset_gpio);
ret = regulator_set_enable_if_allowed(hub->vdd, false);
if (ret)
dev_err(dev, "can't disable vdd-supply: %d\n", ret);
return ret;
}
static const struct onboard_hub_data usb2514_data = {
.power_on_delay_us = 500,
.reset_us = 1,
};
static const struct udevice_id usb_onboard_hub_ids[] = {
/* Use generic usbVID,PID dt-bindings (usb-device.yaml) */
{ .compatible = "usb424,2514", /* USB2514B USB 2.0 */
.data = (ulong)&usb2514_data,
}
};
U_BOOT_DRIVER(usb_onboard_hub) = {
.name = "usb_onboard_hub",
.id = UCLASS_USB_HUB,
.probe = usb_onboard_hub_probe,
.remove = usb_onboard_hub_remove,
.of_match = usb_onboard_hub_ids,
.priv_auto = sizeof(struct onboard_hub),
};
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