[PATCH] arm64: dts: rockchip: Fix Bluetooth stability on LCKFB TaiShan Pi

[wming126 at 126.com]

From: Ming Wang <wangming5719 at gmail.com>

The AP6212 WiFi/BT module on the LCKFB TaiShan Pi (RK3566) is prone to
communication timeouts and reset failures (error -110) when operating at
3 Mbps.

This patch stabilizes the Bluetooth interface by:
1. Updating the compatible string to 'brcm,bcm43430a1-bt' to better reflect
   the actual chip revision used in the AP6212 module.
2. Lowering the maximum UART baud rate from 3,000,000 to 1,500,000 bps.
   Tests show that 1.5 Mbps is the reliable upper limit for this board's
   UART configuration, eliminating the initialization timeouts.

Signed-off-by: Ming Wang <wangming5719 at gmail.com>
---
 arch/arm64/boot/dts/rockchip/rk3566-lckfb-tspi.dts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/boot/dts/rockchip/rk3566-lckfb-tspi.dts b/arch/arm64/boot/dts/rockchip/rk3566-lckfb-tspi.dts
index ed65d3120..18a560a6e 100644
--- a/arch/arm64/boot/dts/rockchip/rk3566-lckfb-tspi.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3566-lckfb-tspi.dts
@@ -635,10 +635,10 @@ &uart1 {
 	status = "okay";
 
 	bluetooth: bluetooth {
-		compatible = "brcm,bcm43438-bt";
+		compatible = "brcm,bcm43430a1-bt";
 		clocks = <&rk809 1>;
 		clock-names = "lpo";
-		max-speed = <3000000>;
+		max-speed = <1500000>;
 		pinctrl-names = "default";
 		pinctrl-0 = <&bt_host_wake_l &bt_wake_l &bt_enable_h>;
 		shutdown-gpios = <&gpio2 RK_PB7 GPIO_ACTIVE_HIGH>;
-- 
2.43.0