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

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Message-ID: <20190218162814.GI15711@atomide.com>
Date:   Mon, 18 Feb 2019 08:28:14 -0800
From:   Tony Lindgren <tony@...mide.com>
To:     Faiz Abbas <faiz_abbas@...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

* Tony Lindgren <tony@...mide.com> [190218 16:20]:
> * Faiz Abbas <faiz_abbas@...com> [190218 13:38]:
> > 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.
> 
> OK thanks.

So I guess the dma properties should be under optional
properties in the binding doc then.

Regards,

Tony