[PATCH v4 2/4] arm: sunxi: add a config option to fixup a Bluetooth address

[Andre Heider <a.heider@gmail.com>]

Some Bluetooth controllers, like the BCM4345C5 of the Orange Pi 3,
ship with the controller default address.

Add a config option to fix it up so it can function properly.

Signed-off-by: Andre Heider <a.heider@gmail.com>
Tested-by: Ondrej Jirman <megous@megous.com>
Acked-by: Maxime Ripard <mripard@kernel.org>
---
 arch/arm/mach-sunxi/Kconfig | 11 +++++++++++
 board/sunxi/board.c         | 34 ++++++++++++++++++++++++++++++++++
 2 files changed, 45 insertions(+)

diff --git a/arch/arm/mach-sunxi/Kconfig b/arch/arm/mach-sunxi/Kconfig
index 3a3b673430..4c6977e8fb 100644
--- a/arch/arm/mach-sunxi/Kconfig
+++ b/arch/arm/mach-sunxi/Kconfig
@@ -1010,4 +1010,15 @@ config PINE64_DT_SELECTION
 	  option, the device tree selection code specific to Pine64 which
 	  utilizes the DRAM size will be enabled.
 
+config FIXUP_BDADDR
+	string "Fixup the Bluetooth controller address"
+	default ""
+	help
+	  This option specifies the DT compatible name of the Bluetooth
+	  controller for which to set the "local-bd-address" property.
+	  Set this option if your device ships with the Bluetooth controller
+	  default address.
+	  The used address is "bdaddr" if set, and "ethaddr" with the LSB
+	  flipped elsewise.
+
 endif
diff --git a/board/sunxi/board.c b/board/sunxi/board.c
index e670793479..c05682a331 100644
--- a/board/sunxi/board.c
+++ b/board/sunxi/board.c
@@ -878,6 +878,38 @@ int misc_init_r(void)
 	return 0;
 }
 
+static void fixup_bd_address(void *blob)
+{
+	/* Some devices ship with a Bluetooth controller default address.
+	 * Set a valid address through the device tree.
+	 */
+	uchar tmp[ETH_ALEN], bdaddr[ETH_ALEN];
+	unsigned int sid[4];
+	int i;
+
+	if (!CONFIG_FIXUP_BDADDR[0])
+		return;
+
+	if (eth_env_get_enetaddr("bdaddr", tmp)) {
+		/* Convert between the binary formats of the corresponding stacks */
+		for (i = 0; i < ETH_ALEN; ++i)
+			bdaddr[i] = tmp[ETH_ALEN - i - 1];
+	} else {
+		if (!get_unique_sid(sid))
+			return;
+
+		bdaddr[0] = ((sid[3] >>  0) & 0xff) ^ 1;
+		bdaddr[1] = (sid[3] >>  8) & 0xff;
+		bdaddr[2] = (sid[3] >> 16) & 0xff;
+		bdaddr[3] = (sid[3] >> 24) & 0xff;
+		bdaddr[4] = (sid[0] >>  0) & 0xff;
+		bdaddr[5] = 0x02;
+	}
+
+	do_fixup_by_compat(blob, CONFIG_FIXUP_BDADDR,
+			   "local-bd-address", bdaddr, ETH_ALEN, 1);
+}
+
 int ft_board_setup(void *blob, bd_t *bd)
 {
 	int __maybe_unused r;
@@ -888,6 +920,8 @@ int ft_board_setup(void *blob, bd_t *bd)
 	 */
 	setup_environment(blob);
 
+	fixup_bd_address(blob);
+
 #ifdef CONFIG_VIDEO_DT_SIMPLEFB
 	r = sunxi_simplefb_setup(blob);
 	if (r)
-- 
2.24.1