linux-kernel - Re: [PATCH] ACPI: add support for CSRT table

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Date:	Wed, 16 Jan 2013 17:10:38 +0200
From:	Mika Westerberg <mika.westerberg@...ux.intel.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	linux-acpi@...r.kernel.org, Len Brown <lenb@...nel.org>,
	linux-kernel@...r.kernel.org,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: Re: [PATCH] ACPI: add support for CSRT table

On Wed, Jan 16, 2013 at 04:05:13PM +0100, Rafael J. Wysocki wrote:
> On Wednesday, January 16, 2013 06:42:16 AM Mika Westerberg wrote:
> > On Wed, Jan 16, 2013 at 12:35:56AM +0100, Rafael J. Wysocki wrote:
> > > On Monday, January 14, 2013 11:51:51 AM Mika Westerberg wrote:
> > > > Core System Resources Table (CSRT) is a proprietary ACPI table that
> > > > contains resources for certain devices that are not found in the DSDT
> > > > table. Typically a shared DMA controller might be found here.
> > > > 
> > > > This patch adds support for this table. We go through all entries in the
> > > > table and make platform devices of them. The resources from the table are
> > > > passed with the platform device.
> > > > 
> > > > There is one special resource in the table and it is the DMA request line
> > > > base and number of request lines. This information might be needed by the
> > > > DMA controller driver as it needs to map the ACPI DMA request line number
> > > > to the actual request line understood by the hardware. This range is passed
> > > > as IORESOURCE_DMA resource.
> > > 
> > > I have a question: Who's going to bind to those platform devices created
> > > by the code in this patch and how exactly this is going to happen?
> > 
> > Typically it is the DMA driver (but not limited to that). It is supposed to
> > work so that either the driver name (in the platform driver struct) matches
> > the device name in the CSRT or like with the dw_dmac case we do something
> > like:
> > 
> > /* The platform device created is "INTL9C60.0.auto" */
> > 
> > static const struct platform_device_id dw_dma_ids[] = {
> >         { "INTL9C60", 0 },
> > 	{ }
> > }
> > 
> > static struct platform_driver dw_driver = {
> > 	...
> > 	.id_table = dw_dma_ids,
> > };
> 
> OK, that's fine by me.  Will apply.

Thanks!

> Do you want it to go to any particular branch (eg. along with the acpi-scan
> changes)?

This is not dependent on anything so you can pick the branch :-)
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