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authorKuninori Morimoto <kuninori.morimoto.gx@renesas.com>2012-05-29 10:31:39 +0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-06-13 23:38:36 +0400
commit4527715979a34601b783f5f12774586c679c2a89 (patch)
tree554b0370d99e69d030442863e247de8882f14219
parentcfaf025112d3856637ff34a767ef785ef5cf2ca9 (diff)
downloadlinux-4527715979a34601b783f5f12774586c679c2a89.tar.xz
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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--include/linux/usb/renesas_usbhs.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/include/linux/usb/renesas_usbhs.h b/include/linux/usb/renesas_usbhs.h
index 547e59cc00ea..c5d36c65c33b 100644
--- a/include/linux/usb/renesas_usbhs.h
+++ b/include/linux/usb/renesas_usbhs.h
@@ -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;