[RFC PATCH 09/15] Bluetooth: hci_qca: add support for pwrseq

[Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>]

Support using pwrseq for powering up and down the QCA BT chips.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
---
 drivers/bluetooth/hci_qca.c | 22 +++++++++++++++++++---
 1 file changed, 19 insertions(+), 3 deletions(-)

diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
index 2d23e8a3ca14..a908a952c0ef 100644
--- a/drivers/bluetooth/hci_qca.c
+++ b/drivers/bluetooth/hci_qca.c
@@ -31,6 +31,7 @@
 #include <linux/regulator/consumer.h>
 #include <linux/serdev.h>
 #include <linux/mutex.h>
+#include <linux/pwrseq/consumer.h>
 #include <asm/unaligned.h>
 
 #include <net/bluetooth/bluetooth.h>
@@ -211,6 +212,7 @@ struct qca_serdev {
 	struct gpio_desc *sw_ctrl;
 	struct clk	 *susclk;
 	enum qca_btsoc_type btsoc_type;
+	struct pwrseq *pwrseq;
 	struct regulator_bulk_data *vreg_bulk;
 	int num_vregs;
 	bool vregs_on;
@@ -1602,7 +1604,10 @@ static int qca_power_on(struct hci_dev *hdev)
 	 */
 	qcadev = serdev_device_get_drvdata(hu->serdev);
 	serdev_device_close(hu->serdev);
-	ret = qca_regulator_enable(qcadev);
+	if (qcadev->pwrseq)
+		ret = pwrseq_full_power_on(qcadev->pwrseq);
+	else
+		ret = qca_regulator_enable(qcadev);
 	if (ret)
 		return ret;
 
@@ -1863,7 +1868,10 @@ static void qca_power_shutdown(struct hci_uart *hu)
 		host_set_baudrate(hu, 2400);
 		qca_send_power_pulse(hu, false);
 	}
-	qca_regulator_disable(qcadev);
+	if (qcadev->pwrseq)
+		pwrseq_power_off(qcadev->pwrseq);
+	else
+		qca_regulator_disable(qcadev);
 
 	set_bit(QCA_BT_OFF, &qca->flags);
 }
@@ -2015,7 +2023,15 @@ static int qca_serdev_probe(struct serdev_device *serdev)
 	else
 		qcadev->btsoc_type = QCA_ROME;
 
-	if (data && data->num_vregs) {
+	qcadev->pwrseq = devm_pwrseq_get_optional(&serdev->dev, "bt");
+	if (IS_ERR(qcadev->pwrseq)) {
+		err = PTR_ERR(qcadev->pwrseq);
+		BT_ERR("Failed to init regulators:%d", err);
+		return err;
+
+	}
+
+	if (!qcadev->pwrseq && data && data->num_vregs) {
 		err = qca_init_regulators(qcadev, &serdev->dev, data->vregs,
 					  data->num_vregs);
 		if (err) {
-- 
2.30.2