linux-kernel - [PATCH] arm64: dts: rockchip: nanopi4: decrease Bluetooth UART baud rate

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Date:   Tue, 21 Sep 2021 01:56:46 +0800
From:   Chen-Yu Tsai <wens@...nel.org>
To:     Heiko Stuebner <heiko@...ech.de>
Cc:     Chen-Yu Tsai <wens@...e.org>, Robin Murphy <robin.murphy@....com>,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] arm64: dts: rockchip: nanopi4: decrease Bluetooth UART baud rate

From: Chen-Yu Tsai <wens@...e.org>

The RK3399 does not seem to be able to properly generate the required
64 MHz clock for the UART to operate at 4MBd.

Drop the baud rate down to 3MBd, which can be used as the clock
controller is able to produce a 48 MHz clock.

Fixes: 3e2f0bb72be3 ("arm64: dts: rockchip: Add nanopi4 bluetooth")
Signed-off-by: Chen-Yu Tsai <wens@...e.org>
---
 arch/arm64/boot/dts/rockchip/rk3399-nanopi4.dtsi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/rockchip/rk3399-nanopi4.dtsi b/arch/arm64/boot/dts/rockchip/rk3399-nanopi4.dtsi
index 8c0ff6c96e03..45ff053b119d 100644
--- a/arch/arm64/boot/dts/rockchip/rk3399-nanopi4.dtsi
+++ b/arch/arm64/boot/dts/rockchip/rk3399-nanopi4.dtsi
@@ -699,7 +699,7 @@ bluetooth {
 		device-wakeup-gpios = <&gpio2 RK_PD2 GPIO_ACTIVE_HIGH>;
 		host-wakeup-gpios = <&gpio0 RK_PA4 GPIO_ACTIVE_HIGH>;
 		shutdown-gpios = <&gpio0 RK_PB1 GPIO_ACTIVE_HIGH>;
-		max-speed = <4000000>;
+		max-speed = <3000000>;
 		pinctrl-names = "default";
 		pinctrl-0 = <&bt_reg_on_h &bt_host_wake_l &bt_wake_l>;
 		vbat-supply = <&vcc3v3_sys>;
-- 
2.30.2