linux-kernel - Re: [PATCH 3/9] ACPI: add struct acpi_amba_quirk for AMD pl330 specific device config

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Date:	Fri, 11 Dec 2015 15:01:49 +0530
From:	Vinod Koul <vinod.koul@...el.com>
To:	"Wang, Annie" <Annie.Wang@....com>
Cc:	Graeme Gregory <gg@...mlogic.co.uk>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	Joerg Roedel <joro@...tes.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
	"dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
	"iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
	Borislav Petkov <bp@...en8.de>,
	"Huang, Ray" <Ray.Huang@....com>,
	"Wan, Vincent" <Vincent.Wan@....com>, "Xue, Ken" <Ken.Xue@....com>,
	"Li, Tony" <Tony.Li@....com>
Subject: Re: [PATCH 3/9] ACPI: add struct acpi_amba_quirk for AMD pl330
 specific device config

On Fri, Dec 11, 2015 at 06:57:51AM +0000, Wang, Annie wrote:
> >> +	/*
> >> +	 * If the ACPI device already has a node attached. It must be
> >> +	 * renamed.
> >> +	 */
> >> +	if (quirk->quirk & MULTI_ATTACHED_QUIRK)
> >> +		sprintf(amba_devname, "%s%s", dev_name(&adev->dev),
> >"DMA");
> >> +	else
> >> +		memcpy(amba_devname, dev_name(&adev->dev),
> >> +		       strlen(dev_name(&adev->dev)));
> >> +
> >> +	amba_dev = amba_device_alloc(amba_devname,
> >>  				     resource->start,
> >>  				     resource_size(resource));
> >>
> >
> >Isn't this basially an MFD in a rather odd fashion?

MFD yes, odd perhaps made out here!
> >
> >I would have though having a device which just splits the resources then creates 2
> >children would be a whole lot simpler?
> >
Yup!

> 
> It seems more complex, if I  trans an ACPI device to pdev, then attach 2 platform child nodes,
> and create an amba device refer to one of the childs. Too many trans. 

Sorry but I dont think that is right assumption, it will simper and PM would
become easy

-- 
~Vinod
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