Re: [PATCH] [DEBUG] ARM: dts: sh73a0: Add minimal device node for Coresight-ETM

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Hello.

On 01/28/2016 06:21 PM, Geert Uytterhoeven wrote:

When using a JTAG debugger on an sh73a0-based system, the debugger
looses connection with the hardware during kernel boot-up, as unused

   s/looses/loses/.

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 {

   What's 'ptm'?

+		compatible = "arm,coresight-etm3x";
+		power-domains = <&pd_d4>;
+	};
+
  	timer@f0000600 {
  		compatible = "arm,cortex-a9-twd-timer";
  		reg = <0xf0000600 0x20>;

MBR, Sergei




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