linux-kernel - Re: [PATCH 1/5] mtd: nand: omap2: Support parsing dma channel information from DT

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Date:	Wed, 14 Oct 2015 14:52:11 +0300
From:	Roger Quadros <rogerq@...com>
To:	Franklin S Cooper Jr <fcooper@...com>,
	<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<linux-omap@...r.kernel.org>, <linux-mtd@...ts.infradead.org>,
	<nsekhar@...com>, <computersforpeace@...il.com>,
	<dwmw2@...radead.org>, <tony@...mide.com>
Subject: Re: [PATCH 1/5] mtd: nand: omap2: Support parsing dma channel
 information from DT

Franklin,

On 14/10/15 14:36, Roger Quadros wrote:
> On 13/10/15 04:38, Franklin S Cooper Jr wrote:
>> Switch from dma_request_channel to allow passing dma channel
>> information from DT rather than hardcoding a value.
>>
>> Signed-off-by: Franklin S Cooper Jr <fcooper@...com>
> 
> Acked-by: Roger Quadros <rogerq@...com>
> 
>> ---
>>  drivers/mtd/nand/omap2.c | 4 +++-
>>  1 file changed, 3 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
>> index d0f2620..957c32f 100644
>> --- a/drivers/mtd/nand/omap2.c
>> +++ b/drivers/mtd/nand/omap2.c
>> @@ -1866,7 +1866,9 @@ static int omap_nand_probe(struct platform_device *pdev)
>>  		dma_cap_zero(mask);
>>  		dma_cap_set(DMA_SLAVE, mask);
>>  		sig = OMAP24XX_DMA_GPMC;
>> -		info->dma = dma_request_channel(mask, omap_dma_filter_fn, &sig);
>> +		info->dma = dma_request_slave_channel_compat(mask,
>> +			omap_dma_filter_fn, &sig, pdev->dev.parent, "rxtx");
>> +

Just discovered that you are using the parent device node.

How about moving the dma bindings to the nand node instead and using
pdev->dev here?

>>  		if (!info->dma) {
>>  			dev_err(&pdev->dev, "DMA engine request failed\n");
>>  			err = -ENXIO;
>>
> 

cheers,
-roger

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