When using a JTAG debugger on an sh73a0-based system, the debugger
looses connection with the hardware during kernel boot-up, as unused
PM Domains are powered down by the genpd core.
To keep on debugging, add a minimal device node for the Coresight-ETM
hardware block, and hook it up to the D4 PM Domain, so the R-Mobile
System Controller driver will keep the domain powered.
Signed-off-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
---
Not intended for upstream merge, as the D4 PM Domain is not needed for
normal use.
---
arch/arm/boot/dts/sh73a0.dtsi | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/arch/arm/boot/dts/sh73a0.dtsi b/arch/arm/boot/dts/sh73a0.dtsi
index 866ee5de09454d14..a6e47611cc807547 100644
--- a/arch/arm/boot/dts/sh73a0.dtsi
+++ b/arch/arm/boot/dts/sh73a0.dtsi
@@ -40,6 +40,11 @@
};
};
+ ptm {
+ compatible = "arm,coresight-etm3x";
+ power-domains = <&pd_d4>;
+ };
+
timer@f0000600 {
compatible = "arm,cortex-a9-twd-timer";
reg = <0xf0000600 0x20>;
--
1.9.1
