[PATCH v2] arm64: dts: rockchip: add more cpu operating points for RK3328

[PATCH v2] arm64: dts: rockchip: add more cpu operating points for RK3328

[Leonidas P. Papadakos]

This allows for greater max frequency on rk3328 boards,
increasing performance.

It has been included in Armbian (a linux distibution for ARM boards)
for a while now without any reported issues

https://github.com/armbian/build/blob/master/patch/kernel/rockchip64-default/enable-1392mhz-opp.patch
https://github.com/armbian/build/blob/master/patch/kernel/rockchip64-default/enable-1512mhz-opp.patch

Signed-off-by: Leonidas P. Papadakos <papadakospan-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
 arch/arm64/boot/dts/rockchip/rk3328.dtsi | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/arm64/boot/dts/rockchip/rk3328.dtsi b/arch/arm64/boot/dts/rockchip/rk3328.dtsi
index 84f14b132..42a59f254 100644
--- a/arch/arm64/boot/dts/rockchip/rk3328.dtsi
+++ b/arch/arm64/boot/dts/rockchip/rk3328.dtsi
@@ -123,6 +123,16 @@
 			opp-microvolt = <1300000>;
 			clock-latency-ns = <40000>;
 		};
+		opp-1392000000 {
+			opp-hz = /bits/ 64 <1392000000>;
+			opp-microvolt = <1350000>;
+			clock-latency-ns = <40000>;
+		};
+		opp-1512000000 {
+			opp-hz = /bits/ 64 <1512000000>;
+			opp-microvolt = <1450000>;
+			clock-latency-ns = <40000>;
+		};
 	};
 
 	amba {
-- 
2.21.0

Re: [PATCH v2] arm64: dts: rockchip: add more cpu operating points for RK3328

[Heiko Stuebner]

Am Freitag, 1. März 2019, 20:55:53 CET schrieb Leonidas P. Papadakos:
> This allows for greater max frequency on rk3328 boards,
> increasing performance.
> 
> It has been included in Armbian (a linux distibution for ARM boards)
> for a while now without any reported issues
> 
> https://github.com/armbian/build/blob/master/patch/kernel/rockchip64-default/enable-1392mhz-opp.patch
> https://github.com/armbian/build/blob/master/patch/kernel/rockchip64-default/enable-1512mhz-opp.patch
> 
> Signed-off-by: Leonidas P. Papadakos <papadakospan-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>

as per the response from Rockchip regarding the maximum specification,
we'll stay within the save area of frequencies - so not adding these
higher ones.

Overclocking a chip is a personal prerogative but should not be part
of the general mainline devicetree.


Heiko