Retrieve BD address from the DT local-bd-address property.
This address must be unique and is usually added in the DT
by the bootloader which has access to the provisioned data.

Signed-off-by: Loic Poulain <redacted>
---
v2: Set device as unconfigured if default address detected
    Add warning if BD addr retrieved from DT
v3: if no addr retrieved from DT, unconditionally set
    the invalid BD addr flag.
    swap and set bdaddr in the platform probe
v4: Add dt-bindings documentation
    split patch in two parts (setup, dt prop)
    use local-bd-address name instead of local-mac-address

drivers/bluetooth/btqcomsmd.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)

diff --git a/drivers/bluetooth/btqcomsmd.c b/drivers/bluetooth/btqcomsmd.c
index c70fae75c4ad..08a83cb30af6 100644
--- a/drivers/bluetooth/btqcomsmd.c
+++ b/drivers/bluetooth/btqcomsmd.c

@@ -15,6 +15,8 @@

#include <linux/module.h>
#include <linux/slab.h>
#include <linux/rpmsg.h>
+#include <linux/of.h>
+
#include <linux/soc/qcom/wcnss_ctrl.h>
#include <linux/platform_device.h>

@@ -126,6 +128,7 @@ static int btqcomsmd_setup(struct hci_dev *hdev)

static int btqcomsmd_probe(struct platform_device *pdev)
{
+	const bdaddr_t *local_bd_addr;
	struct btqcomsmd *btq;
	struct hci_dev *hdev;
	void *wcnss;

@@ -147,6 +150,18 @@ static int btqcomsmd_probe(struct platform_device *pdev)

	if (IS_ERR(btq->cmd_channel))
		return PTR_ERR(btq->cmd_channel);

+	/* The local-bd-address DT property is usually injected by the
+	 * bootloader which has access to the allocated BD address.
+	 */
+	local_bd_addr = of_get_property(pdev->dev.of_node, "local-mac-address",
+					&ret);
+	if (local_bd_addr && ret == sizeof(bdaddr_t)) {
+		/* local-bd-address stored with most significant byte first */
+		baswap(&btq->bdaddr, local_bd_addr);