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From: Jonas Bonn <jonas@norrbonn.se>
To: linux-kernel@vger.kernel.org, linux-spi@vger.kernel.org
Cc: Jonas Bonn <jonas@norrbonn.se>
Subject: [PATCH 0/2] spi: support inter-word delays
Date: Fri, 25 Jan 2019 12:44:27 +0100	[thread overview]
Message-ID: <20190125114429.20066-1-jonas@norrbonn.se> (raw)

This short series adds support for SPI inter-word delays and configures
the spi-atmel driver to honour the setting.

Some SPI slaves are so slow that they are unable to keep up even at the
SPI controller's lowest available clock frequency.  I have such a
configuration where an AVR-based SPI slave is unable to feed the SPI bus
fast enough even the SPI master runs at the lowest possible clock speed.

Jonas Bonn (2):
  spi: support inter-word delay requirement for devices
  spi-atmel: support inter-word delay

 Documentation/devicetree/bindings/spi/spi-bus.txt |  1 +
 drivers/spi/spi-atmel.c                           | 11 ++++++-----
 drivers/spi/spi.c                                 |  4 ++++
 include/linux/spi/spi.h                           |  1 +
 4 files changed, 12 insertions(+), 5 deletions(-)

-- 
2.19.1


             reply	other threads:[~2019-01-25 11:44 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-25 11:44 Jonas Bonn [this message]
2019-01-25 11:44 ` [PATCH 1/2] spi: support inter-word delay requirement for devices Jonas Bonn
2019-01-25 11:53   ` Baolin Wang
2019-01-25 12:06     ` Jonas Bonn
2019-01-25 17:47       ` Mark Brown
2019-01-25 17:50         ` Mark Brown
2019-01-26  7:52           ` Jonas Bonn
2019-01-26 10:25             ` Geert Uytterhoeven
2019-01-26 15:40               ` Jonas Bonn
2019-01-28  7:41                 ` Geert Uytterhoeven
2019-01-28 11:47                   ` Mark Brown
2019-01-28 11:51                     ` Jonas Bonn
2019-01-28 11:54                       ` Geert Uytterhoeven
2019-01-25 11:44 ` [PATCH 2/2] spi-atmel: support inter-word delay Jonas Bonn
2019-01-25 11:44   ` Jonas Bonn
2019-01-25 11:47   ` Jonas Bonn
2019-01-25 11:47     ` Jonas Bonn

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