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 12:07:40 +0200
From:	Andy Shevchenko <andy.shevchenko@...il.com>
To:	Peter Ujfalusi <peter.ujfalusi@...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 Tue, Dec 1, 2015 at 11:56 AM, Peter Ujfalusi <peter.ujfalusi@...com> wrote:
> 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().

Understood, though that function was implemented before
has_acpi_companion() has been introduced.

> Will switch to use the has_acpi_companion() for the next RFC.

Good.

-- 
With Best Regards,
Andy Shevchenko
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