usb: misc: onboard_usb_hub: Add reset-gpio support
Despite default reset upon probe, release reset line after powering up the hub and assert reset again before powering down. Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com> Link: https://lore.kernel.org/r/20220727141117.909361-1-alexander.stein@ew.tq-group.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -7,6 +7,7 @@
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#include <linux/device.h>
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#include <linux/export.h>
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#include <linux/gpio/consumer.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/list.h>
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@ -38,6 +39,8 @@ struct usbdev_node {
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struct onboard_hub {
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struct regulator *vdd;
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struct device *dev;
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const struct onboard_hub_pdata *pdata;
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struct gpio_desc *reset_gpio;
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bool always_powered_in_suspend;
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bool is_powered_on;
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bool going_away;
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@ -56,6 +59,9 @@ static int onboard_hub_power_on(struct onboard_hub *hub)
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return err;
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}
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fsleep(hub->pdata->reset_us);
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gpiod_set_value_cansleep(hub->reset_gpio, 0);
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hub->is_powered_on = true;
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return 0;
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@ -65,6 +71,11 @@ static int onboard_hub_power_off(struct onboard_hub *hub)
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{
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int err;
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if (hub->reset_gpio) {
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gpiod_set_value_cansleep(hub->reset_gpio, 1);
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fsleep(hub->pdata->reset_us);
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}
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err = regulator_disable(hub->vdd);
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if (err) {
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dev_err(hub->dev, "failed to disable regulator: %d\n", err);
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@ -219,6 +230,7 @@ static void onboard_hub_attach_usb_driver(struct work_struct *work)
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static int onboard_hub_probe(struct platform_device *pdev)
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{
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const struct of_device_id *of_id;
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struct device *dev = &pdev->dev;
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struct onboard_hub *hub;
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int err;
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@ -227,10 +239,26 @@ static int onboard_hub_probe(struct platform_device *pdev)
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if (!hub)
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return -ENOMEM;
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of_id = of_match_device(onboard_hub_match, &pdev->dev);
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if (!of_id)
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return -ENODEV;
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hub->pdata = of_id->data;
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if (!hub->pdata)
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return -EINVAL;
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hub->vdd = devm_regulator_get(dev, "vdd");
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if (IS_ERR(hub->vdd))
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return PTR_ERR(hub->vdd);
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hub->reset_gpio = devm_gpiod_get_optional(dev, "reset",
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GPIOD_OUT_HIGH);
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if (IS_ERR(hub->reset_gpio))
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return dev_err_probe(dev, PTR_ERR(hub->reset_gpio), "failed to get reset GPIO\n");
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if (hub->reset_gpio)
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fsleep(hub->pdata->reset_us);
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hub->dev = dev;
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mutex_init(&hub->lock);
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INIT_LIST_HEAD(&hub->udev_list);
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@ -6,12 +6,24 @@
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#ifndef _USB_MISC_ONBOARD_USB_HUB_H
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#define _USB_MISC_ONBOARD_USB_HUB_H
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struct onboard_hub_pdata {
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unsigned long reset_us; /* reset pulse width in us */
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};
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static const struct onboard_hub_pdata microchip_usb424_data = {
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.reset_us = 1,
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};
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static const struct onboard_hub_pdata realtek_rts5411_data = {
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.reset_us = 0,
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};
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static const struct of_device_id onboard_hub_match[] = {
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{ .compatible = "usb424,2514" },
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{ .compatible = "usbbda,411" },
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{ .compatible = "usbbda,5411" },
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{ .compatible = "usbbda,414" },
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{ .compatible = "usbbda,5414" },
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{ .compatible = "usb424,2514", .data = µchip_usb424_data, },
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{ .compatible = "usbbda,411", .data = &realtek_rts5411_data, },
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{ .compatible = "usbbda,5411", .data = &realtek_rts5411_data, },
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{ .compatible = "usbbda,414", .data = &realtek_rts5411_data, },
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{ .compatible = "usbbda,5414", .data = &realtek_rts5411_data, },
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{}
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};
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