usb: phy: phy-gpio-vbus-usb: Add device tree probing

Make it possible to probe the GPIO VBUS detection driver
from the device tree compatible for GPIO USB B connectors.

Since this driver is using the "gpio-usb-b-connector"
compatible, it is important to discern it from the role
switch connector driver (which does not provide a phy),
so we add some Kconfig text and depend on !USB_CONN_GPIO.

Cc: Rob Herring <robh@kernel.org>
Cc: Prashant Malani <pmalani@chromium.org>
Cc: Felipe Balbi <balbi@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20221106230506.1646101-1-linus.walleij@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/phy/Kconfig b/drivers/usb/phy/Kconfig
index 2acbe41..efdcafd 100644 (file)
--- a/drivers/usb/phy/Kconfig
+++ b/drivers/usb/phy/Kconfig
@@ -93,12 +93,16 @@ config USB_GPIO_VBUS
        tristate "GPIO based peripheral-only VBUS sensing 'transceiver'"
        depends on GPIOLIB || COMPILE_TEST
        depends on USB_GADGET || !USB_GADGET # if USB_GADGET=m, this can't be 'y'
+       depends on !USB_CONN_GPIO
        select USB_PHY
        help
          Provides simple GPIO VBUS sensing for controllers with an
          internal transceiver via the usb_phy interface, and
          optionally control of a D+ pullup GPIO as well as a VBUS
-         current limit regulator.
+         current limit regulator. This driver is for devices that do
+         NOT support role switch. OTG devices that can do role switch
+         (master/peripheral) shall use the USB based connection
+         detection driver USB_CONN_GPIO.
 
 config OMAP_OTG
        tristate "OMAP USB OTG controller driver"

diff --git a/drivers/usb/phy/phy-gpio-vbus-usb.c b/drivers/usb/phy/phy-gpio-vbus-usb.c
index f13f553..12dfeff 100644 (file)
--- a/drivers/usb/phy/phy-gpio-vbus-usb.c
+++ b/drivers/usb/phy/phy-gpio-vbus-usb.c
@@ -366,12 +366,24 @@ static const struct dev_pm_ops gpio_vbus_dev_pm_ops = {
 
 MODULE_ALIAS("platform:gpio-vbus");
 
+/*
+ * NOTE: this driver matches against "gpio-usb-b-connector" for
+ * devices that do NOT support role switch.
+ */
+static const struct of_device_id gpio_vbus_of_match[] = {
+       {
+               .compatible = "gpio-usb-b-connector",
+       },
+       {},
+};
+
 static struct platform_driver gpio_vbus_driver = {
        .driver = {
                .name  = "gpio-vbus",
 #ifdef CONFIG_PM
                .pm = &gpio_vbus_dev_pm_ops,
 #endif
+               .of_match_table = gpio_vbus_of_match,
        },
        .probe          = gpio_vbus_probe,
        .remove         = gpio_vbus_remove,