Re: [PATCH 1/2] arm64: dts: rockchip: Fix the BT clock-names on rk3399-hugsun-x99

[sashiko-bot@kernel.org]

Thank you for your contribution! Sashiko AI review found 1 potential issue(s) to consider:
- [Low] Incorrect DT clock-name misrepresents a 32.768kHz LPO clock as a high-frequency txco clock, bypassing driver rate enforcement.
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--- Patch [1]: [PATCH 1/2] arm64: dts: rockchip: Fix the BT clock-names on rk3399-hugsun-x99 ---
commit 9f58538cc4607e21e187cba8faf882820a368c05
Author: Fabio Estevam <festevam@gmail.com>

arm64: dts: rockchip: Fix the BT clock-names on rk3399-hugsun-x99

This commit updates the clock-names property for the Bluetooth node on
the rk3399-hugsun-x99 board to fix a dt-schema warning. It changes the
name from ext_clock to txco.

> diff --git a/arch/arm64/boot/dts/rockchip/rk3399-hugsun-x99.dts b/arch/arm64/boot/dts/rockchip/rk3399-hugsun-x99.dts
> --- a/arch/arm64/boot/dts/rockchip/rk3399-hugsun-x99.dts
> +++ b/arch/arm64/boot/dts/rockchip/rk3399-hugsun-x99.dts
> @@ -703,7 +703,7 @@ &uart0 {
>  	bluetooth {
>  		compatible = "brcm,bcm43438-bt";
>  		clocks = <&rk808 1>;
> -		clock-names = "ext_clock";
> +		clock-names = "txco";

[Severity: Low]
Should this clock be named lpo instead of txco?

The clock source <&rk808 1> is the PMIC's rtc_clko_wifi output, which
is a fixed 32.768kHz clock. According to the Bluetooth architecture and
brcm,bluetooth.yaml, a 32.768kHz clock represents the Low Power Oscillator
(lpo), while txco is typically reserved for high-frequency reference clocks
(like 26MHz or 37.4MHz).

If it is named txco, does the hci_bcm driver misclassify it and leave
its internal lpo_clk reference NULL? This would bypass the driver's
explicit 32kHz rate enforcement via clk_set_rate(dev->lpo_clk, 32768).

>  		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>;

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Sashiko AI review · https://sashiko.dev/#/patchset/20260806121039.16967-1-festevam@gmail.com?part=1