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Commit a3cb6d60 authored by Sean Wang's avatar Sean Wang Committed by Marcel Holtmann
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Bluetooth: btmtkuart: add an implementation for boot-gpios property 



Not every platform has the pinctrl device integrates the GPIO the function
such as MT7621 whose pinctrl and GPIO are separate hardware so the driver
adds additional boot-gpios to let the MT766[3,8]U can enter the proper boot
mode by gpiod for such platform.

Signed-off-by: default avatarSean Wang <sean.wang@mediatek.com>
Signed-off-by: default avatarMarcel Holtmann <marcel@holtmann.org>
parent 14e3ed84

drivers/bluetooth/btmtkuart.c

+25 −9
Original line number Diff line number Diff line
@@ -119,6 +119,7 @@ struct btmtkuart_dev { 


	struct regulator *vcc;

	struct gpio_desc *reset;

	struct gpio_desc *boot;

	struct pinctrl *pinctrl;

	struct pinctrl_state *pins_runtime;

	struct pinctrl_state *pins_boot;
@@ -911,6 +912,13 @@ static int btmtkuart_parse_dt(struct serdev_device *serdev) 
			return err;

		}



		bdev->boot = devm_gpiod_get_optional(&serdev->dev, "boot",

						     GPIOD_OUT_LOW);

		if (IS_ERR(bdev->boot)) {

			err = PTR_ERR(bdev->boot);

			return err;

		}



		bdev->pinctrl = devm_pinctrl_get(&serdev->dev);

		if (IS_ERR(bdev->pinctrl)) {

			err = PTR_ERR(bdev->pinctrl);
@@ -919,8 +927,10 @@ static int btmtkuart_parse_dt(struct serdev_device *serdev) 


		bdev->pins_boot = pinctrl_lookup_state(bdev->pinctrl,

						       "default");

		if (IS_ERR(bdev->pins_boot)) {

		if (IS_ERR(bdev->pins_boot) && !bdev->boot) {

			err = PTR_ERR(bdev->pins_boot);

			dev_err(&serdev->dev,

				"Should assign RXD to LOW at boot stage\n");

			return err;

		}
@@ -996,8 +1006,14 @@ static int btmtkuart_probe(struct serdev_device *serdev) 
	set_bit(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks);



	if (btmtkuart_is_standalone(bdev)) {

		/* Switch to the specific pin state for the booting requires */

		if (bdev->boot) {

			gpiod_set_value_cansleep(bdev->boot, 1);

		} else {

			/* Switch to the specific pin state for the booting

			 * requires.

			 */

			pinctrl_select_state(bdev->pinctrl, bdev->pins_boot);

		}



		/* Power on */

		err = regulator_enable(bdev->vcc);
@@ -1017,6 +1033,10 @@ static int btmtkuart_probe(struct serdev_device *serdev) 
		 * mode the device requires for UART transfers.

		 */

		msleep(50);



		if (bdev->boot)

			devm_gpiod_put(&serdev->dev, bdev->boot);



		pinctrl_select_state(bdev->pinctrl, bdev->pins_runtime);



		/* A standalone device doesn't depends on power domain on SoC,
@@ -1037,10 +1057,8 @@ static int btmtkuart_probe(struct serdev_device *serdev) 
	return 0;



err_regulator_disable:

	if (btmtkuart_is_standalone(bdev))  {

		pinctrl_select_state(bdev->pinctrl, bdev->pins_boot);

	if (btmtkuart_is_standalone(bdev))

		regulator_disable(bdev->vcc);

	}



	return err;

}
@@ -1050,10 +1068,8 @@ static void btmtkuart_remove(struct serdev_device *serdev) 
	struct btmtkuart_dev *bdev = serdev_device_get_drvdata(serdev);

	struct hci_dev *hdev = bdev->hdev;



	if (btmtkuart_is_standalone(bdev))  {

		pinctrl_select_state(bdev->pinctrl, bdev->pins_boot);

	if (btmtkuart_is_standalone(bdev))

		regulator_disable(bdev->vcc);

	}



	hci_unregister_dev(hdev);

	hci_free_dev(hdev);