linux-kernel - [PATCH 0/3] Add PM and DMA support for AT91 USART as SPI

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Date:   Wed, 21 Nov 2018 13:27:29 +0200
From:   Radu Pirea <radu_nicolae.pirea@....ro>
To:     richard.genoud@...il.com, lee.jones@...aro.org, robh+dt@...nel.org,
        mark.rutland@....com, nicolas.ferre@...rochip.com,
        alexandre.belloni@...tlin.com, ludovic.desroches@...rochip.co,
        broonie@...nel.org
Cc:     linux-kernel@...r.kernel.org, linux-spi@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Radu Pirea <radu_nicolae.pirea@....ro>
Subject: [PATCH 0/3] Add PM and DMA support for AT91 USART as SPI

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