linux-kernel - Re: [PATCH 4/6] dmaengine: omap-dma: Take DMA request number from DT if it is available

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Date:	Tue, 24 Feb 2015 16:28:42 +0200
From:	Peter Ujfalusi <peter.ujfalusi@...com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
CC:	<vinod.koul@...el.com>, Tony Lindgren <tony@...mide.com>,
	<grant.likely@...aro.org>, <dmaengine@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<linux-omap@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <robh+dt@...nel.org>,
	<nm@...com>
Subject: Re: [PATCH 4/6] dmaengine: omap-dma: Take DMA request number from
 DT if it is available

On 02/24/2015 04:25 PM, Russell King - ARM Linux wrote:
> On Tue, Feb 24, 2015 at 04:21:21PM +0200, Peter Ujfalusi wrote:
>> Use the dma-requests property from DT to get the number of DMA requests.
>> In case of legacy boot or failure to find the property, use the default
>> 127 as number of requests.
>>
>> Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...com>
>> ---
>>  drivers/dma/omap-dma.c | 11 ++++++++++-
>>  1 file changed, 10 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/dma/omap-dma.c b/drivers/dma/omap-dma.c
>> index 56c33e93dd24..7def31c919f4 100644
>> --- a/drivers/dma/omap-dma.c
>> +++ b/drivers/dma/omap-dma.c
>> @@ -34,6 +34,7 @@ struct omap_dmadev {
>>  	const struct omap_dma_reg *reg_map;
>>  	struct omap_system_dma_plat_info *plat;
>>  	bool legacy;
>> +	unsigned dma_requests;
>>  	spinlock_t irq_lock;
>>  	uint32_t irq_enable_mask;
>>  	struct omap_chan *lch_map[OMAP_SDMA_CHANNELS];
>> @@ -1118,7 +1119,15 @@ static int omap_dma_probe(struct platform_device *pdev)
>>  
>>  	tasklet_init(&od->task, omap_dma_sched, (unsigned long)od);
>>  
>> -	for (i = 0; i < OMAP_SDMA_REQUESTS; i++) {
>> +	if (!pdev->dev.of_node || of_property_read_u32(pdev->dev.of_node,
>> +						       "dma-requests",
>> +						       &od->dma_requests)) {
>> +		dev_info(&pdev->dev,
>> +			 "DMA request lines not specified, using 127\n");
>> +		od->dma_requests = 127;
> 
> What happened to OMAP_SDMA_REQUESTS?
> 
> If you're not going to use OMAP_SDMA_REQUESTS, then don't add it.  If
> you are going to use it, please also change the dev_info() line to use
> that macro too.

Aargh, yes you are right. Will fix this up in v2.

-- 
Péter
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