[PATCH 2/2] Bluetooth: btnxpuart: implement powerup sequence.
From: Catalin Popescu
Date: Fri Oct 04 2024 - 07:36:26 EST
NXP bluetooth chip shares power supply and reset gpio with a WLAN
chip. Add support for power supply and reset and enforce powerup
sequence:
1. apply power supply
2. deassert reset/powerdown
Signed-off-by: Catalin Popescu <catalin.popescu@xxxxxxxxxxxxxxxxxxxx>
---
drivers/bluetooth/btnxpuart.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/drivers/bluetooth/btnxpuart.c b/drivers/bluetooth/btnxpuart.c
index 4f493be763b8..e58e7ac7999f 100644
--- a/drivers/bluetooth/btnxpuart.c
+++ b/drivers/bluetooth/btnxpuart.c
@@ -16,6 +16,8 @@
#include <linux/crc8.h>
#include <linux/crc32.h>
#include <linux/string_helpers.h>
+#include <linux/regulator/consumer.h>
+#include <linux/reset.h>
#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>
@@ -188,6 +190,7 @@ struct btnxpuart_dev {
struct ps_data psdata;
struct btnxpuart_data *nxp_data;
+ struct reset_control *pdn;
};
#define NXP_V1_FW_REQ_PKT 0xa5
@@ -1458,6 +1461,7 @@ static int nxp_serdev_probe(struct serdev_device *serdev)
{
struct hci_dev *hdev;
struct btnxpuart_dev *nxpdev;
+ int err;
nxpdev = devm_kzalloc(&serdev->dev, sizeof(*nxpdev), GFP_KERNEL);
if (!nxpdev)
@@ -1485,6 +1489,16 @@ static int nxp_serdev_probe(struct serdev_device *serdev)
crc8_populate_msb(crc8_table, POLYNOMIAL8);
+ nxpdev->pdn = devm_reset_control_get_optional_shared(&serdev->dev, NULL);
+ if (IS_ERR(nxpdev->pdn))
+ return PTR_ERR(nxpdev->pdn);
+
+ err = devm_regulator_get_enable(&serdev->dev, "vcc");
+ if (err) {
+ dev_err(&serdev->dev, "Failed to enable vcc regulator\n");
+ return err;
+ }
+
/* Initialize and register HCI device */
hdev = hci_alloc_dev();
if (!hdev) {
@@ -1492,6 +1506,8 @@ static int nxp_serdev_probe(struct serdev_device *serdev)
return -ENOMEM;
}
+ reset_control_deassert(nxpdev->pdn);
+
nxpdev->hdev = hdev;
hdev->bus = HCI_UART;
@@ -1509,6 +1525,7 @@ static int nxp_serdev_probe(struct serdev_device *serdev)
if (hci_register_dev(hdev) < 0) {
dev_err(&serdev->dev, "Can't register HCI device\n");
+ reset_control_assert(nxpdev->pdn);
hci_free_dev(hdev);
return -ENODEV;
}
@@ -1540,6 +1557,7 @@ static void nxp_serdev_remove(struct serdev_device *serdev)
}
ps_cleanup(nxpdev);
hci_unregister_dev(hdev);
+ reset_control_assert(nxpdev->pdn);
hci_free_dev(hdev);
}
--
2.34.1