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5fdce1fa17
Don't error out if there is no vdd regulator supply, as these are optional properties. Signed-off-by: Venkatesh Yadav Abbarapu <venkatesh.abbarapu@amd.com> Reviewed-by: Marek Vasut <marex@denx.de>
110 lines
2.4 KiB
C
110 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Driver for onboard USB hubs
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*
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* Copyright (C) 2022, STMicroelectronics - All Rights Reserved
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*
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* Mostly inspired by Linux kernel v6.1 onboard_usb_hub driver
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*/
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#include <asm/gpio.h>
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#include <dm.h>
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#include <dm/device_compat.h>
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#include <linux/delay.h>
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#include <power/regulator.h>
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struct onboard_hub {
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struct udevice *vdd;
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struct gpio_desc *reset_gpio;
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};
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struct onboard_hub_data {
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unsigned long reset_us;
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unsigned long power_on_delay_us;
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};
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int usb_onboard_hub_reset(struct udevice *dev)
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{
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struct onboard_hub_data *data =
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(struct onboard_hub_data *)dev_get_driver_data(dev);
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struct onboard_hub *hub = dev_get_priv(dev);
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int ret;
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hub->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_IS_OUT);
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/* property is optional, don't return error! */
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if (!hub->reset_gpio)
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return 0;
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ret = dm_gpio_set_value(hub->reset_gpio, 1);
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if (ret)
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return ret;
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udelay(data->reset_us);
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ret = dm_gpio_set_value(hub->reset_gpio, 0);
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if (ret)
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return ret;
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udelay(data->power_on_delay_us);
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return 0;
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}
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static int usb_onboard_hub_probe(struct udevice *dev)
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{
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struct onboard_hub *hub = dev_get_priv(dev);
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int ret;
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ret = device_get_supply_regulator(dev, "vdd-supply", &hub->vdd);
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if (ret && ret != -ENOENT) {
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dev_err(dev, "can't get vdd-supply: %d\n", ret);
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return ret;
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}
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if (hub->vdd) {
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ret = regulator_set_enable_if_allowed(hub->vdd, true);
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if (ret && ret != -ENOSYS) {
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dev_err(dev, "can't enable vdd-supply: %d\n", ret);
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return ret;
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}
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}
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return usb_onboard_hub_reset(dev);
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}
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static int usb_onboard_hub_remove(struct udevice *dev)
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{
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struct onboard_hub *hub = dev_get_priv(dev);
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int ret;
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if (hub->reset_gpio)
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dm_gpio_free(hub->reset_gpio->dev, hub->reset_gpio);
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ret = regulator_set_enable_if_allowed(hub->vdd, false);
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if (ret)
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dev_err(dev, "can't disable vdd-supply: %d\n", ret);
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return ret;
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}
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static const struct onboard_hub_data usb2514_data = {
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.power_on_delay_us = 500,
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.reset_us = 1,
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};
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static const struct udevice_id usb_onboard_hub_ids[] = {
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/* Use generic usbVID,PID dt-bindings (usb-device.yaml) */
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{ .compatible = "usb424,2514", /* USB2514B USB 2.0 */
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.data = (ulong)&usb2514_data,
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}
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};
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U_BOOT_DRIVER(usb_onboard_hub) = {
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.name = "usb_onboard_hub",
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.id = UCLASS_USB_HUB,
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.probe = usb_onboard_hub_probe,
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.remove = usb_onboard_hub_remove,
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.of_match = usb_onboard_hub_ids,
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.priv_auto = sizeof(struct onboard_hub),
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};
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