arm64: dts: rockchip: Move L3 cache outside CPUs in RK3588(S) SoC dtsi

Move the "l3_cache" node outside the "cpus" node in the base dtsi file for
Rockchip RK3588(S) SoCs.  The A55 and A76 CPU cores in these SoCs belong to
the ARM DynamIQ IP core lineup, which places the L3 cache outside the CPUs
and into the DynamIQ Shared Unit (DSU). [1]  Thus, moving the L3 cache DT
node one level higher in the DT improves the way the physical topology of
the RK3588(S) SoCs is represented in the SoC dtsi files.

While there, add a comment that explains it briefly, to save curious readers
from the need to reference the repository log for a clarification.

[1] ARM DynamIQ Shared Unit revision r4p0 TRM, version 0400-02

Fixes: c9211fa2602b ("arm64: dts: rockchip: Add base DT for rk3588 SoC")
Helped-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Dragan Simic <dsimic@manjaro.org>
Link: https://lore.kernel.org/r/84264d0713fb51ae2b9b731e28fc14681beea853.1727345965.git.dsimic@manjaro.org
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

diff --git a/arch/arm64/boot/dts/rockchip/rk3588-base.dtsi b/arch/arm64/boot/dts/rockchip/rk3588-base.dtsi
index d97d84b888375c5a5a480255c92790ad511befb7..fc67585b64b7baa33d5a816517f20c4cb940b52d 100644 (file)
--- a/arch/arm64/boot/dts/rockchip/rk3588-base.dtsi
+++ b/arch/arm64/boot/dts/rockchip/rk3588-base.dtsi
@@ -337,15 +337,19 @@
                        cache-unified;
                        next-level-cache = <&l3_cache>;
                };
+       };
 
-               l3_cache: l3-cache {
-                       compatible = "cache";
-                       cache-size = <3145728>;
-                       cache-line-size = <64>;
-                       cache-sets = <4096>;
-                       cache-level = <3>;
-                       cache-unified;
-               };
+       /*
+        * The L3 cache belongs to the DynamIQ Shared Unit (DSU),
+        * so it's represented here, outside the "cpus" node
+        */
+       l3_cache: l3-cache {
+               compatible = "cache";
+               cache-size = <3145728>;
+               cache-line-size = <64>;
+               cache-sets = <4096>;
+               cache-level = <3>;
+               cache-unified;
        };
 
        display_subsystem: display-subsystem {