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usb: renesas_usbhs: add DMAEngine ID specification note 

renesas_usbhs DMAEngine uses D0FIFO/D1FIFO,
but the data transfer direction should be fixed for keeping consistency.
This patch explain about it on renesas_usbhs.h

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Kuninori Morimoto 2012-05-28 23:31:39 -07:00 committed by Felipe Balbi
parent fa84c57516
commit d3c568c302
1 changed files with 8 additions and 0 deletions
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8
include/linux/usb/renesas_usbhs.h
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@ -132,6 +132,14 @@ struct renesas_usbhs_driver_param {
* option:
*
* dma id for dmaengine
* The data transfer direction on D0FIFO/D1FIFO should be
* fixed for keeping consistency.
* So, the platform id settings will be..
* .d0_tx_id = xx_TX,
* .d1_rx_id = xx_RX,
* or
* .d1_tx_id = xx_TX,
* .d0_rx_id = xx_RX,
*/
int d0_tx_id;
int d0_rx_id;