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 19:11:32 +0530
From:   Faiz Abbas <faiz_abbas@...com>
To:     Tony Lindgren <tony@...mide.com>
CC:     <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-mmc@...r.kernel.org>, <linux-omap@...r.kernel.org>,
        <ulf.hansson@...aro.org>, <robh+dt@...nel.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

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.

Thanks,
Faiz