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serial: stm32: adding dma support
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This patch adds dma mode support for rx and tx
with pio mode as fallback in case of dma error.

Signed-off-by: Gerald Baeza <gerald.baeza@st.com>
Signed-off-by: Alexandre TORGUE <alexandre.torgue@st.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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atorgue authored and gregkh committed Sep 22, 2016
1 parent 3fa047f commit 3489187
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