linux-kernel - Re: [PATCH v1 2/5] mmc: mxs-mmc: add dt probe support

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Date:	Wed, 14 Mar 2012 14:42:25 +0800
From:	Dong Aisheng <aisheng.dong@...escale.com>
To:	Grant Likely <grant.likely@...retlab.ca>
CC:	Dong Aisheng-B29396 <B29396@...escale.com>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
	Guo Shawn-R65073 <r65073@...escale.com>,
	"kernel@...gutronix.de" <kernel@...gutronix.de>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	"cjb@...top.org" <cjb@...top.org>,
	"rdunlap@...otime.net" <rdunlap@...otime.net>,
	"vinod.koul@...ux.intel.com" <vinod.koul@...ux.intel.com>
Subject: Re: [PATCH v1 2/5] mmc: mxs-mmc: add dt probe support

On Wed, Mar 14, 2012 at 01:42:38AM +0800, Grant Likely wrote:
> On Tue, 13 Mar 2012 16:47:05 +0800, Dong Aisheng <b29396@...escale.com> wrote:
> > From: Dong Aisheng <dong.aisheng@...aro.org>
> > 
> > Signed-off-by: Dong Aisheng <dong.aisheng@...aro.org>
> > 
> > ---
> > The patch is still using a private way for dma part binding
> > since the common dma binding is still under discussion.
> > http://www.spinics.net/lists/linux-omap/msg65528.html
> > 
> > Will update to use common dma binding when it hits mainline.
> > ---
> >  .../devicetree/bindings/mmc/fsl-mxs-mmc.txt        |   23 ++++++
> >  drivers/mmc/host/mxs-mmc.c                         |   82 +++++++++++++++++++-
> >  2 files changed, 102 insertions(+), 3 deletions(-)
> > 
> > diff --git a/Documentation/devicetree/bindings/mmc/fsl-mxs-mmc.txt b/Documentation/devicetree/bindings/mmc/fsl-mxs-mmc.txt
> > new file mode 100644
> > index 0000000..adc1142
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/mmc/fsl-mxs-mmc.txt
> > @@ -0,0 +1,23 @@
> > +* FREESCALE MXS MMC peripheral
> > +
> > +Required properties:
> > +- compatible : Should be "fsl,<chip>-mmc"
> > +- reg : Should contain registers location and length
> > +- interrupts : Should contain interrupt.
> > +  The format is <irq_err irq_dma>.
> > +- dma_channel: Should contain the dma channel it uses
> 
> Don't use '_' in property names.
> 
Yes, my mistake.

> The is a generic dma binding being drafted that uses a phandle to the dma
> controller and the ability to encode channel numbers.  You may want to take
> a look at it.
> 
I will look at it.
Thanks for the reminder.

...
> > +	dmares->flags = IORESOURCE_DMA;
> > +	ret = of_property_read_u32(np, "dma_channel", &dmares->start);
> > +	if (ret) {
> > +		dev_err(&pdev->dev, "unable to get dmares from dt\n");
> > +		return NULL;
> > +	}
> > +	dmares->end = dmares->start;
> > +
> > +	return dmares;
> > +}
> > +
> > +static int __devinit mxs_mmc_get_of_property(struct platform_device *pdev,
> > +				struct mxs_mmc_platform_data **ppdata)
> > +{
> > +	struct device_node *np = pdev->dev.of_node;
> > +	struct mxs_mmc_platform_data *pdata = *ppdata;
> > +
> > +	if (!np)
> > +		return -ENODEV;
> > +
> > +	pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
> 
> Ditto
> 
Got it.

> Fix up those comments and you can add my:
> 
> Acked-by: Grant Likely <grant.likely@...retlab.ca>
> 
Thanks.

Regards
Dong Aisheng

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