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| /linux/drivers/spi/ |
| H A D | spi-rockchip.c | diff 76b17e6e4923e4138ed9a4d480cba148ff239dc9 Fri Mar 27 00:30:25 CET 2015 Julius Werner <jwerner@chromium.org> spi/rockchip: Add device tree property to configure Rx Sample Delay
We have found that we can sometimes see read failures on boards with
high-capacitance SPI lines. It seems that the controller samples the Rx
data line too early, and its register interface has an "Rx Sample Delay"
setting to fine-tune against this issue.
This patch adds a new optional device tree entry that can configure this
delay in terms of nanoseconds. The kernel will calculate the
best-fitting amount of parent clock ticks to program the controller with
based on that.
Signed-off-by: Julius Werner <jwerner@chromium.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
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