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Bluetooth: btmtkuart: add an implementation for boot-gpios property

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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: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Sean Wang 2019-06-02 09:04:16 +08:00 committed by Marcel Holtmann
parent 14e3ed84d7
commit a3cb6d602a
1 changed files with 25 additions and 9 deletions
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34
drivers/bluetooth/btmtkuart.c
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@ -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 */
pinctrl_select_state(bdev->pinctrl, bdev->pins_boot);
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);