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>

diff --git a/drivers/bluetooth/btmtkuart.c b/drivers/bluetooth/btmtkuart.c
index 1257149cfdc49de7542053d5d7d614e2a5bee427..e11169ad8247ecea7cda9dbf56b8847727032066 100644 (file)
--- 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);