This adds the 32k clock to the RK3399 Gru board file. Even though it's not directly used, muxes will end up traversing the entire clk tree on calls to determine_rate if it doesn't exist. This is because the 32k clk is listed as a possible parent on some clks. Since the clk doesn't know about the 32k clk (it was never registered), it triggers a global search for it. This can happen about 40 times per second, which isn't great for power.
Signed-off-by: Derek Basehore <[email protected]> --- arch/arm64/boot/dts/rockchip/rk3399-gru.dtsi | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/arch/arm64/boot/dts/rockchip/rk3399-gru.dtsi b/arch/arm64/boot/dts/rockchip/rk3399-gru.dtsi index ca07f6032200..a07aa4c570c0 100644 --- a/arch/arm64/boot/dts/rockchip/rk3399-gru.dtsi +++ b/arch/arm64/boot/dts/rockchip/rk3399-gru.dtsi @@ -14,6 +14,13 @@ stdout-path = "serial2:115200n8"; }; + ap_rtc_clk: ap-rtc-clk { + compatible = "fixed-clock"; + clock-frequency = <32768>; + clock-output-names = "xin32k"; + #clock-cells = <0>; + }; + /* * Power Tree * -- 2.20.0.rc0.387.gc7a69e6b6c-goog
