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docs: firmware-guide: ACPI: Replace dma_request_slave_channel() with dma_request_chan() 

dma_request_chan() is the preferred API to request slave channels.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
[ rjw: Subject ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Peter Ujfalusi 2019-12-17 12:48:56 +02:00 committed by Rafael J. Wysocki
parent d1eef1c619
commit 0435bcd9e1
1 changed files with 8 additions and 8 deletions
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16
Documentation/firmware-guide/acpi/enumeration.rst
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@ -71,8 +71,8 @@ DMA support
DMA controllers enumerated via ACPI should be registered in the system to
provide generic access to their resources. For example, a driver that would
like to be accessible to slave devices via generic API call
dma_request_slave_channel() must register itself at the end of the probe
function like this::
dma_request_chan() must register itself at the end of the probe function like
this::
err = devm_acpi_dma_controller_register(dev, xlate_func, dw);
/* Handle the error if it's not a case of !CONFIG_ACPI */
@ -112,15 +112,15 @@ could look like::
}
#endif
dma_request_slave_channel() will call xlate_func() for each registered DMA
controller. In the xlate function the proper channel must be chosen based on
dma_request_chan() will call xlate_func() for each registered DMA controller.
In the xlate function the proper channel must be chosen based on
information in struct acpi_dma_spec and the properties of the controller
provided by struct acpi_dma.
Clients must call dma_request_slave_channel() with the string parameter that
corresponds to a specific FixedDMA resource. By default "tx" means the first
entry of the FixedDMA resource array, "rx" means the second entry. The table
below shows a layout::
Clients must call dma_request_chan() with the string parameter that corresponds
to a specific FixedDMA resource. By default "tx" means the first entry of the
FixedDMA resource array, "rx" means the second entry. The table below shows a
layout::
Device (I2C0)
{