Re: [RFC PATCH 14/14] dts: bindings: coresight: ETMv4.4 system register access only units

From: Mathieu Poirier
Date: Wed Jul 29 2020 - 13:21:03 EST


On Wed, Jul 22, 2020 at 06:20:40PM +0100, Suzuki K Poulose wrote:
> Document the bindings for ETMv4.4 and later with only system register
> access.
>
> Cc: Rob Herring <robh+dt@xxxxxxxxxx>
> Cc: devicetree@xxxxxxxxxxxxxxx
> Cc: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>
> Cc: Mike Leach <mike.leach@xxxxxxxxxx>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@xxxxxxx>
> ---
> Documentation/devicetree/bindings/arm/coresight.txt | 6 +++++-
> 1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/devicetree/bindings/arm/coresight.txt b/Documentation/devicetree/bindings/arm/coresight.txt
> index d711676b4a51..cfe47bdda728 100644
> --- a/Documentation/devicetree/bindings/arm/coresight.txt
> +++ b/Documentation/devicetree/bindings/arm/coresight.txt
> @@ -34,9 +34,13 @@ its hardware characteristcs.
> Program Flow Trace Macrocell:
> "arm,coresight-etm3x", "arm,primecell";
>
> - - Embedded Trace Macrocell (version 4.x):
> + - Embedded Trace Macrocell (version 4.x), with memory mapped access.
> "arm,coresight-etm4x", "arm,primecell";
>
> + - Embedded Trace Macrocell (version 4.4 and later) with system
> + register access only.
> + "arm,coresight-etm-v4.4";

I would rather call this "arm,coresight-etm-v4.4+" so that the binding's
semantic is still relevant when dealing with ETM v4.5 and onward.

Thanks,
Mathieu

> +
> - Coresight programmable Replicator :
> "arm,coresight-dynamic-replicator", "arm,primecell";
>
> --
> 2.24.1
>