Re: [PATCH] arm64: dts: sun55i: a523: Assign standard clock rates to PRCM bus clocks
From: Jernej Škrabec <jernej.skrabec@gmail.com>
Date: 2025-09-13 11:29:38
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Dne sobota, 13. september 2025 ob 12:16:00 Srednjeevropski poletni čas je Chen-Yu Tsai napisal(a):
From: Chen-Yu Tsai <redacted> At least in the initial version of U-boot support landed upstream, the PRCM bus clocks were not configured, and left at their reset default 24 MHz clock rate. This is quite slow for the peripherals on them. The recommended rates from the manual are: - AHBS: 200 MHz - APBS0: 100 MHz - APBS1: 24 MHz Since 24 MHz is the hardware default, just assign rates for the first two.
I think it's better to be explicit than assume. However, this is fine too. Reviewed-by: Jernej Skrabec <jernej.skrabec@gmail.com> Best regards, Jernej
quoted hunk ↗ jump to hunk
Signed-off-by: Chen-Yu Tsai <redacted> --- arch/arm64/boot/dts/allwinner/sun55i-a523.dtsi | 2 ++ 1 file changed, 2 insertions(+)diff --git a/arch/arm64/boot/dts/allwinner/sun55i-a523.dtsi b/arch/arm64/boot/dts/allwinner/sun55i-a523.dtsi index 3aad1b909501..5cd6ddae86c8 100644 --- a/arch/arm64/boot/dts/allwinner/sun55i-a523.dtsi +++ b/arch/arm64/boot/dts/allwinner/sun55i-a523.dtsi@@ -767,6 +767,8 @@ r_ccu: clock-controller@7010000 { "pll-audio"; #clock-cells = <1>; #reset-cells = <1>; + assigned-clocks = <&r_ccu CLK_R_AHB>, <&r_ccu CLK_R_APB0>; + assigned-clock-rates = <200000000>, <100000000>; }; nmi_intc: interrupt-controller@7010320 {