mirrors/linux
2
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2026-08-27 19:53:15 -04:00
Code Issues Packages Projects Releases Wiki Activity

Bluetooth: btnxpuart: Add M.2 Bluetooth device support using pwrseq

Browse Source 
Power supply to the M.2 Bluetooth device attached to the host using M.2
connector is controlled using the 'uart' pwrseq device. So add support
for getting the pwrseq device if the OF graph link is present.

Once obtained, pwrseq_power_on() is called to power up the M.2 Bluetooth
card. The power sequencer descriptor is obtained via pwrseq_get() with
the UART controller device (serdev->ctrl->dev), since the OF graph
link is defined on the UART controller node.

Also add the explicit pwrseq_put() call in all exit paths, pwrseq_put()
already calls pwrseq_power_off() internally, so no separate
pwrseq_power_off() call is needed.

Signed-off-by: Sherry Sun <sherry.sun@nxp.com>
Reviewed-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Manivannan Sadhasivam <mani@kernel.org>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
This commit is contained in:
Sherry Sun
2026-07-21 11:04:58 +08:00
committed by Luiz Augusto von Dentz
parent 414b365ece
commit e48e332d84
1 changed files with 30 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

34
drivers/bluetooth/btnxpuart.c
View File

@@ -9,6 +9,8 @@
#include <linux/serdev.h>
#include <linux/of.h>
#include <linux/of_graph.h>
#include <linux/pwrseq/consumer.h>
#include <linux/skbuff.h>
#include <linux/unaligned.h>
#include <linux/firmware.h>
@@ -211,6 +213,7 @@ struct btnxpuart_dev {
struct ps_data psdata;
struct btnxpuart_data *nxp_data;
struct pwrseq_desc *pwrseq;
struct reset_control *pdn;
struct hci_uart hu;
};
@@ -1860,11 +1863,26 @@ static int nxp_serdev_probe(struct serdev_device *serdev)
return err;
}
if (of_graph_is_present(dev_of_node(&serdev->ctrl->dev))) {
struct pwrseq_desc *pwrseq;
pwrseq = pwrseq_get(&serdev->ctrl->dev, "uart");
if (IS_ERR(pwrseq))
return dev_err_probe(&serdev->dev, PTR_ERR(pwrseq),
"failed to get pwrseq\n");
nxpdev->pwrseq = pwrseq;
err = pwrseq_power_on(pwrseq);
if (err)
goto err_pwrseq_put;
}
/* Initialize and register HCI device */
hdev = hci_alloc_dev();
if (!hdev) {
dev_err(&serdev->dev, "Can't allocate HCI device\n");
return -ENOMEM;
err = -ENOMEM;
goto err_pwrseq_put;
}
reset_control_deassert(nxpdev->pdn);
@@ -1895,13 +1913,16 @@ static int nxp_serdev_probe(struct serdev_device *serdev)
if (bacmp(&ba, BDADDR_ANY))
hci_set_quirk(hdev, HCI_QUIRK_USE_BDADDR_PROPERTY);
if (hci_register_dev(hdev) < 0) {
err = hci_register_dev(hdev);
if (err < 0) {
dev_err(&serdev->dev, "Can't register HCI device\n");
goto probe_fail;
}
if (ps_setup(hdev))
if (ps_setup(hdev)) {
err = -ENODEV;
goto probe_fail_unregister;
}
hci_devcd_register(hdev, nxp_coredump, nxp_coredump_hdr,
nxp_coredump_notify);
@@ -1913,7 +1934,10 @@ static int nxp_serdev_probe(struct serdev_device *serdev)
probe_fail:
reset_control_assert(nxpdev->pdn);
hci_free_dev(hdev);
return -ENODEV;
err_pwrseq_put:
if (nxpdev->pwrseq)
pwrseq_put(nxpdev->pwrseq);
return err;
}
static void nxp_serdev_remove(struct serdev_device *serdev)
@@ -1940,6 +1964,8 @@ static void nxp_serdev_remove(struct serdev_device *serdev)
ps_cleanup(nxpdev);
hci_unregister_dev(hdev);
reset_control_assert(nxpdev->pdn);
if (nxpdev->pwrseq)
pwrseq_put(nxpdev->pwrseq);
hci_free_dev(hdev);
}