linux-kernel - Re: [PATCH v3 8/9] coresight: Cleanup coresight DT bindings

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Date:   Mon, 30 Jul 2018 17:13:56 -0600
From:   Rob Herring <robh@...nel.org>
To:     Suzuki K Poulose <suzuki.poulose@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        mathieu.poirier@...aro.org, mike.leach@...aro.org,
        robert.walker@....com, coresight@...ts.linaro.org,
        frowand.list@...il.com, devicetree@...r.kernel.org,
        matt.sealey@....com, charles.garcia-tobin@....com,
        john.horley@....com, al.grant@....com,
        Sudeep Holla <sudeep.holla@....com>
Subject: Re: [PATCH v3 8/9] coresight: Cleanup coresight DT bindings

On Fri, Jul 27, 2018 at 11:15:36AM +0100, Suzuki K Poulose wrote:
> The coresight drivers relied on default bindings for graph
> in DT, while reusing the "reg" field of the "ports" to indicate
> the actual hardware port number for the connections. This can
> cause duplicate ports with same addresses, but different
> direction. However, with the rules getting stricter for the
> address mismatch with the label, it is no longer possible to use
> the port address field for the hardware port number.
> 
> This patch introduces new DT binding rules for coresight
> components, based on the same generic DT graph bindings, but
> avoiding the address duplication.
> 
> - All output ports must be specified under a child node with
>   name "out-ports".
> - All input ports must be specified under a childe node with
>   name "in-ports".
> - Port address should match the hardware port number.
> 
> The support for legacy bindings is retained, with a warning.
> 
> Cc: Sudeep Holla <sudeep.holla@....com>
> Cc: Rob Herring <robh@...nel.org>
> Reviewed-by: Mathieu Poirier <mathieu.poirier@...aro.org>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
> ---
>  .../devicetree/bindings/arm/coresight.txt          | 95 ++++++++++++---------

Reviewed-by: Rob Herring <robh@...nel.org>

>  drivers/hwtracing/coresight/of_coresight.c         | 98 +++++++++++++++++++---
>  2 files changed, 143 insertions(+), 50 deletions(-)