linux-kernel - Re: [PATCH v2 3/8] dt-bindings: sdhci-omap: Add properties for using external dma

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Date:   Mon, 18 Feb 2019 14:12:40 -0600
From:   Rob Herring <robh@...nel.org>
To:     Faiz Abbas <faiz_abbas@...com>
Cc:     Tony Lindgren <tony@...mide.com>, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-mmc@...r.kernel.org,
        linux-omap@...r.kernel.org, ulf.hansson@...aro.org,
        mark.rutland@....com, adrian.hunter@...el.com, kishon@...com,
        zhang.chunyan@...aro.org
Subject: Re: [PATCH v2 3/8] dt-bindings: sdhci-omap: Add properties for using
 external dma

On Mon, Feb 18, 2019 at 07:11:32PM +0530, Faiz Abbas wrote:
> Hi Tony,
> 
> On 16/02/19 1:37 AM, Tony Lindgren wrote:
> > * Faiz Abbas <faiz_abbas@...com> [190215 19:18]:
> >> From: Chunyan Zhang <zhang.chunyan@...aro.org>
> >>
> >> sdhci-omap can support both external dma controller via dmaengine
> >> framework as well as ADMA which standard SD host controller
> >> provides.
> > 
> > Care to describe here also how to configure things for ADMA and
> > instead of DMA? Just leave out dmas property?
> > 
> 
> That's correct. If dmas property is populated, then use external DMA.
> Otherwise use ADMA/SDMA depending on what you read from the CAPS register.

Then the properties should be optional.

Rob