diff options
Diffstat (limited to 'drivers/usb/dwc3/dwc3-xilinx.c')
| -rw-r--r-- | drivers/usb/dwc3/dwc3-xilinx.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/usb/dwc3/dwc3-xilinx.c b/drivers/usb/dwc3/dwc3-xilinx.c index a6f3a9b38789..67b237c7a76a 100644 --- a/drivers/usb/dwc3/dwc3-xilinx.c +++ b/drivers/usb/dwc3/dwc3-xilinx.c @@ -13,6 +13,7 @@ #include <linux/of.h> #include <linux/platform_device.h> #include <linux/dma-mapping.h> +#include <linux/of_gpio.h> #include <linux/of_platform.h> #include <linux/pm_runtime.h> #include <linux/reset.h> @@ -98,6 +99,7 @@ static int dwc3_xlnx_init_zynqmp(struct dwc3_xlnx *priv_data) { struct device *dev = priv_data->dev; struct reset_control *crst, *hibrst, *apbrst; + struct gpio_desc *reset_gpio; struct phy *usb3_phy; int ret = 0; u32 reg; @@ -201,6 +203,21 @@ static int dwc3_xlnx_init_zynqmp(struct dwc3_xlnx *priv_data) } skip_usb3_phy: + /* ulpi reset via gpio-modepin or gpio-framework driver */ + reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW); + if (IS_ERR(reset_gpio)) { + return dev_err_probe(dev, PTR_ERR(reset_gpio), + "Failed to request reset GPIO\n"); + } + + if (reset_gpio) { + /* Toggle ulpi to reset the phy. */ + gpiod_set_value_cansleep(reset_gpio, 1); + usleep_range(5000, 10000); + gpiod_set_value_cansleep(reset_gpio, 0); + usleep_range(5000, 10000); + } + /* * This routes the USB DMA traffic to go through FPD path instead * of reaching DDR directly. This traffic routing is needed to |