linux-kernel - Re: [RFC v02 03/15] dmaengine: core: Introduce new, universal API to request a channel

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Date:	Tue, 1 Dec 2015 11:56:42 +0200
From:	Peter Ujfalusi <peter.ujfalusi@...com>
To:	Andy Shevchenko <andy.shevchenko@...il.com>
CC:	Vinod Koul <vinod.koul@...el.com>, Arnd Bergmann <arnd@...db.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	dmaengine <dmaengine@...r.kernel.org>,
	Linux OMAP Mailing List <linux-omap@...r.kernel.org>,
	linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
	Sekhar Nori <nsekhar@...com>,
	linux-spi <linux-spi@...r.kernel.org>
Subject: Re: [RFC v02 03/15] dmaengine: core: Introduce new, universal API to
 request a channel

On 11/30/2015 04:51 PM, Andy Shevchenko wrote:
>> +struct dma_chan *dma_request_chan(struct device *dev, const char *name)
>> +{
>> +       struct dma_device *device, *_d;
>> +       struct dma_chan *chan = NULL;
>> +
>> +       /* If device-tree is present get slave info from here */
>> +       if (dev->of_node)
>> +               chan = of_dma_request_slave_channel(dev->of_node, name);
>> +
>> +       /* If device was enumerated by ACPI get slave info from here */
>> +       if (ACPI_HANDLE(dev) && !chan)
> 
> The preferable way is to use
> has_acpi_companion() instead of ACPI_HANDLE().

I have done this part based on the dma_request_slave_channel_reason().
Will switch to use the has_acpi_companion() for the next RFC.

>> +               chan = acpi_dma_request_slave_chan_by_name(dev, name);
>> +
>> +       if (chan)
>> +               return chan;
>> +

-- 
Péter
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