with this patch, performance monitors work
and show sensible data on AM43xx devices:

~# perf stat sleep 5

 Performance counter stats for 'sleep 5':

          6.079585      task-clock (msec)         #    0.001 CPUs utilized
                 3      context-switches          #    0.493 K/sec
                 0      cpu-migrations            #    0.000 K/sec
                35      page-faults               #    0.006 M/sec
           5888256      cycles                    #    0.969 GHz
           1458715      stalled-cycles-frontend   #   24.77% frontend cycles idle
           4632019      stalled-cycles-backend    #   78.67% backend  cycles idle
           1892556      instructions              #    0.32  insns per cycle
                                                  #    2.45  stalled cycles per insn
            141832      branches                  #   23.329 M/sec
             56093      branch-misses             #   39.55% of all branches

       5.018813000 seconds time elapsed

Signed-off-by: Felipe Balbi <redacted>
---
 arch/arm/boot/dts/am4372.dtsi | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/arm/boot/dts/am4372.dtsi b/arch/arm/boot/dts/am4372.dtsi
index 861f127dfead..ea103aa970f1 100644
--- a/arch/arm/boot/dts/am4372.dtsi
+++ b/arch/arm/boot/dts/am4372.dtsi

@@ -51,6 +51,14 @@
 		};
 	};
 
+	pmu {
+		compatible = "arm,cortex-a9-pmu";
+		reg = <0x4b000000 0x800000>;
+		interrutps = <GIC_SPI 54 IRQ_TYPE_LEVEL_HIGH>,
+				<GIC_SPI 55 IRQ_TYPE_LEVEL_HIGH>;
+		ti,hwmods = "debugss";
+	};
+
 	gic: interrupt-controller@48241000 {
 		compatible = "arm,cortex-a9-gic";
 		interrupt-controller;

-- 
2.3.0-rc1

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