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Subject[PATCH v1 4/4] Bluetooth: btmtkuart: add an implementation for clock osc property
Date
From: Sean Wang <sean.wang@mediatek.com>

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>
---
drivers/bluetooth/btmtkuart.c | 21 ++++++++++++++++++---
1 file changed, 18 insertions(+), 3 deletions(-)

diff --git a/drivers/bluetooth/btmtkuart.c b/drivers/bluetooth/btmtkuart.c
index 1257149cfdc4..e11169ad8247 100644
--- a/drivers/bluetooth/btmtkuart.c
+++ b/drivers/bluetooth/btmtkuart.c
@@ -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);
--
2.17.1
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