linux-kernel - Re: [PATCH 2/2] acpi-dma: Add support for "dma-names" device property

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Date:	Thu, 24 Sep 2015 21:05:28 +0530
From:	Vinod Koul <vinod.koul@...el.com>
To:	Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Dan Williams <dan.j.williams@...el.com>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] acpi-dma: Add support for "dma-names" device property

On Mon, Sep 14, 2015 at 05:37:36PM +0300, Mika Westerberg wrote:
> The current implementation hard codes the two supported channels so that
> "tx" is always 0 and "rx" is always 1. This is because there has been no
> suitable way in ACPI to name resources.
> 
> With _DSD device properties we can finally do this:
> 
> 	Device (SPI1) {
> 	    Name (_CRS, ResourceTemplate () {
> 	        ...
> 	        FixedDMA (0x0000, 0x0000, Width32bit)
> 	        FixedDMA (0x0001, 0x0001, Width32bit)
> 	    })
> 
> 	    Name (_DSD, Package () {
> 	        ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
> 	        Package () {
> 	            Package () {"dma-names", Package () {"tx", "rx"}}
> 	        },
> 	    })
> 	}
> 
> The names "tx" and "rx" now provide index of the FixedDMA resource in
> question.
> 
> Modify acpi_dma_request_slave_chan_by_name() so that it looks for
> "dma-names" property first and only then fall back using hardcoded indices.
> 
> The DT "dma-names" binding that we reuse for ACPI is documented in
> Documentation/devicetree/bindings/dma/dma.txt.

Acked-by: Vinod Koul <vinod.koul@...el.com>

This is actually good and will help a lot. Btw would like to see some
tested-by tags, perhaps on dw dma or idma...

-- 
~Vinod
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