From a3cb6d602a7a948f0b4ff77b6a087f9c25038d52 Mon Sep 17 00:00:00 2001 From: Sean Wang Date: Sun, 2 Jun 2019 09:04:16 +0800 Subject: 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: Sean Wang Signed-off-by: Marcel Holtmann --- drivers/bluetooth/btmtkuart.c | 34 +++++++++++++++++++++++++--------- 1 file changed, 25 insertions(+), 9 deletions(-) (limited to 'drivers/bluetooth/btmtkuart.c') diff --git a/drivers/bluetooth/btmtkuart.c b/drivers/bluetooth/btmtkuart.c index f5dbeec8e274..1257149cfdc4 100644 --- a/drivers/bluetooth/btmtkuart.c +++ b/drivers/bluetooth/btmtkuart.c @@ -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); -- cgit v1.2.3