[PATCH v4] riscv: dts: allwinner: d1: Add PMU event node

[Inochi Amaoto]

D1 has several pmu events supported by opensbi.
These events can be used by perf for profiling.

Signed-off-by: Inochi Amaoto <inochiama at outlook.com>
Link: https://dl.linux-sunxi.org/D1/Xuantie_C906_R1S0_User_Manual.pdf
Link: https://github.com/T-head-Semi/openc906/blob/main/C906_RTL_FACTORY/gen_rtl/pmu/rtl/aq_hpcp_top.v#L657
---
changed from v3:
1. remove wrong event mapping of 0x0000a
2. add reference url of c906 events implementation (D1 only support events
described in R1S0 user manual, but event mapping is the same)

changed from v2:
1. move pmu node from /soc to / to avoid warnings when checking.

The meaning of T-HEAD events can be found in this pending patch:
https://lore.kernel.org/linux-perf-users/IA1PR20MB4953DD82D0116EC291C21777BBE2A@IA1PR20MB4953.namprd20.prod.outlook.com

The patch above also provides a example that shows how to setup
environment and use perf with T-HEAD events.
---
 arch/riscv/boot/dts/allwinner/sun20i-d1s.dtsi | 39 +++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/arch/riscv/boot/dts/allwinner/sun20i-d1s.dtsi b/arch/riscv/boot/dts/allwinner/sun20i-d1s.dtsi
index 8275630af977..53a984d78e3f 100644
--- a/arch/riscv/boot/dts/allwinner/sun20i-d1s.dtsi
+++ b/arch/riscv/boot/dts/allwinner/sun20i-d1s.dtsi
@@ -73,4 +73,43 @@ plic: interrupt-controller at 10000000 {
 			#interrupt-cells = <2>;
 		};
 	};
+
+	pmu {
+		compatible = "riscv,pmu";
+		riscv,event-to-mhpmcounters =
+			<0x00003 0x00003 0x00000008>,
+			<0x00004 0x00004 0x00000010>,
+			<0x00005 0x00005 0x00000200>,
+			<0x00006 0x00006 0x00000100>,
+			<0x10000 0x10000 0x00004000>,
+			<0x10001 0x10001 0x00008000>,
+			<0x10002 0x10002 0x00010000>,
+			<0x10003 0x10003 0x00020000>,
+			<0x10019 0x10019 0x00000040>,
+			<0x10021 0x10021 0x00000020>;
+		riscv,event-to-mhpmevent =
+			<0x00003 0x00000000 0x00000001>,
+			<0x00004 0x00000000 0x00000002>,
+			<0x00005 0x00000000 0x00000007>,
+			<0x00006 0x00000000 0x00000006>,
+			<0x10000 0x00000000 0x0000000c>,
+			<0x10001 0x00000000 0x0000000d>,
+			<0x10002 0x00000000 0x0000000e>,
+			<0x10003 0x00000000 0x0000000f>,
+			<0x10019 0x00000000 0x00000004>,
+			<0x10021 0x00000000 0x00000003>;
+		riscv,raw-event-to-mhpmcounters =
+			<0x00000000 0x00000001 0xffffffff 0xffffffff 0x00000008>,
+			<0x00000000 0x00000002 0xffffffff 0xffffffff 0x00000010>,
+			<0x00000000 0x00000003 0xffffffff 0xffffffff 0x00000020>,
+			<0x00000000 0x00000004 0xffffffff 0xffffffff 0x00000040>,
+			<0x00000000 0x00000005 0xffffffff 0xffffffff 0x00000080>,
+			<0x00000000 0x00000006 0xffffffff 0xffffffff 0x00000100>,
+			<0x00000000 0x00000007 0xffffffff 0xffffffff 0x00000200>,
+			<0x00000000 0x0000000b 0xffffffff 0xffffffff 0x00002000>,
+			<0x00000000 0x0000000c 0xffffffff 0xffffffff 0x00004000>,
+			<0x00000000 0x0000000d 0xffffffff 0xffffffff 0x00008000>,
+			<0x00000000 0x0000000e 0xffffffff 0xffffffff 0x00010000>,
+			<0x00000000 0x0000000f 0xffffffff 0xffffffff 0x00020000>;
+	};
 };
--
2.42.0