linux-kernel - Re: [RFC] DMA initialization for manually created devices

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Date:	Tue, 19 Apr 2016 15:52:06 +0300
From:	Felipe Balbi <felipe.balbi@...ux.intel.com>
To:	David Woodhouse <dwmw2@...radead.org>,
	Vinod Koul <vinod.koul@...el.com>
Cc:	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [RFC] DMA initialization for manually created devices


Hi,

David Woodhouse <dwmw2@...radead.org> writes:
> On Tue, 2016-04-19 at 14:38 +0300, Felipe Balbi wrote:
>> 
>> The reason for that I'm using a manually created platform_device and
>> that misses dev->archdata which the underlying/parent PCI device has.
>
> Typically we'd expect you to use the parent device for DMA, as in your
> second option.
>
> That said, we're exploring the option of moving the dma_ops to be a
> first-class member of 'struct device' instead of hiding it in archdata,
> and cleaning up the way that it gets initialised for newly-created
> devices. And at that point we might end up letting it get inherited
> from the parent so your original code *would* work... but I wouldn't
> hold your breath for that.
>
> Definitely *don't* mess around in archdata.

alright, I'll patch it up to use parent device everywhere, at least for
now.

Thanks

-- 
balbi

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