[PATCHv2 09/12] usb: dwc3: pci: add quirk for Baytrails

[Heikki Krogerus]

On some BYT platforms the USB2 PHY needs to be put into
operational mode by the controller driver with GPIOs
controlling the PHYs reset and cs signals.

Signed-off-by: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
---
 drivers/usb/dwc3/dwc3-pci.c | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/drivers/usb/dwc3/dwc3-pci.c b/drivers/usb/dwc3/dwc3-pci.c
index b773fb5..01cfdbd 100644
--- a/drivers/usb/dwc3/dwc3-pci.c
+++ b/drivers/usb/dwc3/dwc3-pci.c
@@ -21,6 +21,8 @@
 #include <linux/slab.h>
 #include <linux/pci.h>
 #include <linux/platform_device.h>
+#include <linux/gpio/consumer.h>
+#include <linux/acpi.h>
 
 #include "platform_data.h"
 
@@ -31,6 +33,15 @@
 #define PCI_DEVICE_ID_INTEL_SPTLP	0x9d30
 #define PCI_DEVICE_ID_INTEL_SPTH	0xa130
 
+static const struct acpi_gpio_params reset_gpios = { 0, 0, false };
+static const struct acpi_gpio_params cs_gpios = { 1, 0, false };
+
+static const struct acpi_gpio_mapping acpi_dwc3_byt_gpios[] = {
+	{ "reset-gpios", &reset_gpios, 1 },
+	{ "cs-gpios", &cs_gpios, 1 },
+	{ },
+};
+
 static int dwc3_pci_quirks(struct pci_dev *pdev)
 {
 	if (pdev->vendor == PCI_VENDOR_ID_AMD &&
@@ -65,6 +76,31 @@ static int dwc3_pci_quirks(struct pci_dev *pdev)
 						sizeof(pdata));
 	}
 
+	if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
+	    pdev->device == PCI_DEVICE_ID_INTEL_BYT) {
+		struct gpio_desc *gpio;
+
+		acpi_dev_add_driver_gpios(ACPI_COMPANION(&pdev->dev),
+					  acpi_dwc3_byt_gpios);
+
+		gpio = gpiod_get(&pdev->dev, "reset");
+		if (IS_ERR(gpio))
+			return 0;
+
+		/* These GPIOs will turn on the USB2 PHY */
+		gpiod_direction_output(gpio, 0);
+		gpiod_set_value_cansleep(gpio, 1);
+		gpiod_put(gpio);
+
+		gpio = gpiod_get(&pdev->dev, "cs");
+		if (!IS_ERR(gpio)) {
+			gpiod_direction_output(gpio, 0);
+			gpiod_set_value_cansleep(gpio, 1);
+			gpiod_put(gpio);
+		}
+		msleep(10);
+	}
+
 	return 0;
 }
 
-- 
2.1.4

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