linux-kernel - [PATCH] arm64: dts: sun55i: a523: Assign standard clock rates to PRCM bus clocks

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Message-Id: <20250913101600.3932762-1-wens@kernel.org>
Date: Sat, 13 Sep 2025 18:16:00 +0800
From: Chen-Yu Tsai <wens@...nel.org>
To: Chen-Yu Tsai <wens@...e.org>,
	Jernej Skrabec <jernej@...nel.org>,
	Samuel Holland <samuel@...lland.org>,
	Andre Przywara <andre.przywara@....com>
Cc: linux-sunxi@...ts.linux.dev,
	devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] arm64: dts: sun55i: a523: Assign standard clock rates to PRCM bus clocks

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

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.

Signed-off-by: Chen-Yu Tsai <wens@...e.org>
---
 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@...0000 {
 				      "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@...0320 {
-- 
2.39.5