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Bluetooth: btmtkuart: add an implementation for clock osc property 

Some board requires explicitily control external osscilator via GPIO.
So, add an implementation of a clock property for an external oscillator
to the device.

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 09:04:17 +08:00 committed by Marcel Holtmann
parent a3cb6d602a
commit 055825614c
1 changed files with 18 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
drivers/bluetooth/btmtkuart.c
View File

@ -115,8 +115,9 @@ struct btmtk_hci_wmt_params {
struct btmtkuart_dev {
struct hci_dev *hdev;
struct serdev_device *serdev;
struct clk *clk;
struct clk *clk;
struct clk *osc;
struct regulator *vcc;
struct gpio_desc *reset;
struct gpio_desc *boot;
@ -912,6 +913,12 @@ static int btmtkuart_parse_dt(struct serdev_device *serdev)
return err;
}
bdev->osc = devm_clk_get_optional(&serdev->dev, "osc");
if (IS_ERR(bdev->osc)) {
err = PTR_ERR(bdev->osc);
return err;
}
bdev->boot = devm_gpiod_get_optional(&serdev->dev, "boot",
GPIOD_OUT_LOW);
if (IS_ERR(bdev->boot)) {
@ -1006,6 +1013,10 @@ static int btmtkuart_probe(struct serdev_device *serdev)
set_bit(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks);
if (btmtkuart_is_standalone(bdev)) {
err = clk_prepare_enable(bdev->osc);
if (err < 0)
return err;
if (bdev->boot) {
gpiod_set_value_cansleep(bdev->boot, 1);
} else {
@ -1017,8 +1028,10 @@ static int btmtkuart_probe(struct serdev_device *serdev)
/* Power on */
err = regulator_enable(bdev->vcc);
if (err < 0)
if (err < 0) {
clk_disable_unprepare(bdev->osc);
return err;
}
/* Reset if the reset-gpios is available otherwise the board
* -level design should be guaranteed.
@ -1068,8 +1081,10 @@ 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))
if (btmtkuart_is_standalone(bdev)) {
regulator_disable(bdev->vcc);
clk_disable_unprepare(bdev->osc);
}
hci_unregister_dev(hdev);
hci_free_dev(hdev);