path: root/include/asm-generic
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authorMika Westerberg <mika.westerberg@linux.intel.com>2015-09-14 17:37:36 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2015-09-25 02:00:19 +0200
commit3f4232ee8b53cf2266d227af299aa511d2d91d11 (patch)
tree2ef4ce5560d372c2a75e7a5bbe00467b1a325e5c /include/asm-generic
parent3f5c8d3187852b1cbed8546169e6293d6d421751 (diff)
acpi-dma: Add support for "dma-names" device property
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. Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Acked-by: Vinod Koul <vinod.koul@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'include/asm-generic')
0 files changed, 0 insertions, 0 deletions

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