From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jonas Bonn Subject: [PATCH v2 0/2] spi: support inter-word delays Date: Fri, 25 Jan 2019 13:24:23 +0100 Message-ID: <20190125122425.30676-1-jonas@norrbonn.se> Mime-Version: 1.0 Content-Transfer-Encoding: 8bit Cc: Jonas Bonn To: linux-kernel@vger.kernel.org, linux-spi@vger.kernel.org Return-path: Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-spi.vger.kernel.org Resubmission to fix thinko in spi-atmel patch. Changed in v2: * Fix atmel-spi driver to not unconditionally set minimal delay if no delay is required (erroneous clamping) 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 .../devicetree/bindings/spi/spi-bus.txt | 1 + drivers/spi/spi-atmel.c | 18 +++++++++++++----- drivers/spi/spi.c | 4 ++++ include/linux/spi/spi.h | 1 + 4 files changed, 19 insertions(+), 5 deletions(-) -- 2.19.1