[PATCH v3 0/3] serial: mxs-auart: add RTS/CTS check for DMA support
Huang Shijie
shijie8 at gmail.com
Sat Aug 3 10:09:13 EDT 2013
The original DMA support works only when RTS/CTS is enabled.
(see the "e800163 serial: mxs-auart: add the DMA support for mx28")
But after several patches, DMA support has lost this limit.
(see the "bcc20f9 serial: mxs-auart: move to use generic DMA helper")
So a UART without the RTS/CTS lines may also enables the DMA support
for it, but it may does not work or works abnormally (since without the
RTS/CTS signals, the TX/RX may not works)
This patch set remove the unnecessary macro MXS_AUART_DMA_CONFIG,
and adds an optional property "fsl,uart-has-rtscts" for the UART DT node
which indicates the UART has RTS and CTS lines.
This patch set also adds a macro MXS_AUART_RTSCTS, and uses it to check
RTS/CTS before we enable the DMA for the UART.
At last, enable the DMA support for auart0 in the imx28-evk boards.
v2 --> v3:
[0] make the patch 2 as the first patch.
[1] add more comments.
v1 --> v2:
[0] changed the comments.
[1] fix the typos.
Huang Shijie (3):
serial: mxs: enable the DMA only when the RTS/CTS is valid
serial: mxs: remove the MXS_AUART_DMA_CONFIG
ARM: dts: imx28-evk: add the RTS/CTS property for auart0
.../bindings/tty/serial/fsl-mxs-auart.txt | 4 ++++
arch/arm/boot/dts/imx28-evk.dts | 1 +
drivers/tty/serial/mxs-auart.c | 8 +++++---
3 files changed, 10 insertions(+), 3 deletions(-)
--
1.7.4.4
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