linux-kernel - Re: [PATCH 4/4] dmaengine: qcom: bam_dma: Add num-ees dt binding for remotely controlled

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Date:   Mon, 29 Jan 2018 10:21:46 -0600
From:   Rob Herring <robh@...nel.org>
To:     srinivas.kandagatla@...aro.org
Cc:     Vinod Koul <vinod.koul@...el.com>,
        Andy Gross <andy.gross@...aro.org>, dmaengine@...r.kernel.org,
        Mark Rutland <mark.rutland@....com>,
        David Brown <david.brown@...aro.org>,
        Dan Williams <dan.j.williams@...el.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
        yanhe@...cinc.com, ramkri@....qualcomm.com, sdharia@...cinc.com
Subject: Re: [PATCH 4/4] dmaengine: qcom: bam_dma: Add num-ees dt binding for
 remotely controlled

On Tue, Jan 16, 2018 at 07:02:36PM +0000, srinivas.kandagatla@...aro.org wrote:
> From: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
> 
> When Linux is master of BAM, it can directly read registers to know number
> of supported execution enviroments, however when its remotely controlled
> reading these registers would trigger a crash if the BAM is not yet
> intialized/powered up on the remote side.
> 
> This patch adds new binding num-ees to specify supported number of
> Execution Environments when BAM is remotely controlled.
> 
> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
> ---
>  Documentation/devicetree/bindings/dma/qcom_bam_dma.txt |  2 ++
>  drivers/dma/qcom/bam_dma.c                             | 15 ++++++++++++---
>  2 files changed, 14 insertions(+), 3 deletions(-)

The correct split is the binding changes in 1 patch. Driver changes 
separate.

> 
> diff --git a/Documentation/devicetree/bindings/dma/qcom_bam_dma.txt b/Documentation/devicetree/bindings/dma/qcom_bam_dma.txt
> index aa6822cbb230..f0d10c2b393e 100644
> --- a/Documentation/devicetree/bindings/dma/qcom_bam_dma.txt
> +++ b/Documentation/devicetree/bindings/dma/qcom_bam_dma.txt
> @@ -17,6 +17,8 @@ Required properties:
>    remote proccessor i.e. execution environment.
>  - num-channels : optional, indicates supported number of DMA channels in a
>    remotely controlled bam.
> +- num-ees : optional, indicates supported number of Execution Environments in a
> +  remotely controlled bam.

This one needs a vendor prefix as it is not a common property.

>  
>  Example:
>