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Subject[PATCH 0/3] Add PM and DMA support for AT91 USART as SPI
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Hi,

This patch series improves the SPI driver for AT91 USART IP and
adds support for DMA transfers, updates the bindings of driver
and PM callback functions.

I decided to use DMA only for transfers long than 16 bytes. DMA
setup introduces a little overhead and is better to use PIO for
short transfers.

Radu Pirea (3):
spi: at91-usart: add power management support
dt-bindings: mfd: atmel-usart: add DMA bindings for SPI mode
spi: at91-usart: add DMA support

.../devicetree/bindings/mfd/atmel-usart.txt | 15 +-
drivers/spi/spi-at91-usart.c | 284 +++++++++++++++++-
2 files changed, 292 insertions(+), 7 deletions(-)

--
2.19.1

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