[PATCH v3 2/6] Bluetooth: hci_qca: schedule a devm action for disabling the clock

[Bartosz Golaszewski <brgl@bgdev.pl>]

From: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

In preparation for unduplicating the hci_uart registration code,
schedule a devres action for disabling the SUSCLK rather than doing it
manually.

We cannot really use devm_clk_get_enabled() as we also set the rate
before enabling the clock. While this should in theory work, I don't
want to risk breaking existing users. One solution for the future is to
add devm_clk_get_enabled_with_rate() to the clock framework.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
---
 drivers/bluetooth/hci_qca.c | 23 +++++++++++++++--------
 1 file changed, 15 insertions(+), 8 deletions(-)

diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
index bc6a49ba26f9..ace920261aa4 100644
--- a/drivers/bluetooth/hci_qca.c
+++ b/drivers/bluetooth/hci_qca.c
@@ -2295,6 +2295,13 @@ static int qca_init_regulators(struct qca_power *qca,
 	return 0;
 }
 
+static void qca_clk_disable_unprepare(void *data)
+{
+	struct clk *clk = data;
+
+	clk_disable_unprepare(clk);
+}
+
 static int qca_serdev_probe(struct serdev_device *serdev)
 {
 	struct qca_serdev *qcadev;
@@ -2434,10 +2441,15 @@ static int qca_serdev_probe(struct serdev_device *serdev)
 		if (err)
 			return err;
 
+		err = devm_add_action_or_reset(&serdev->dev,
+					       qca_clk_disable_unprepare,
+					       qcadev->susclk);
+		if (err)
+			return err;
+
 		err = hci_uart_register_device(&qcadev->serdev_hu, &qca_proto);
 		if (err) {
 			BT_ERR("Rome serdev registration failed");
-			clk_disable_unprepare(qcadev->susclk);
 			return err;
 		}
 	}
@@ -2477,15 +2489,10 @@ static void qca_serdev_remove(struct serdev_device *serdev)
 	case QCA_WCN6750:
 	case QCA_WCN6855:
 	case QCA_WCN7850:
-		if (power->vregs_on) {
+		if (power->vregs_on)
 			qca_power_shutdown(&qcadev->serdev_hu);
-			break;
-		}
-		fallthrough;
-
+		break;
 	default:
-		if (qcadev->susclk)
-			clk_disable_unprepare(qcadev->susclk);
 	}
 
 	hci_uart_unregister_device(&qcadev->serdev_hu);

-- 
2.43.0