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spi: pxa2xx: dt-bindings: Add ready GPIO signal

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This this is used to let the SPI master know that our FIFO is filled and
we're ready to service a transfer. Only useful in slave mode.

A signal like this is used by an embedded controller on a OLPC XO 1.75
machine, that happens to be a SPI master.

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Acked-by: Pavel Machek <pavel@ucw.cz>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Lubomir Rintel 2018-11-13 11:22:26 +01:00 committed by Mark Brown
parent ec93cb6f82
commit 8ae13d0b0d
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2
Documentation/devicetree/bindings/spi/spi-pxa2xx.txt
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@ -12,6 +12,8 @@ Optional properties:
- cs-gpios: list of GPIO chip selects. See the SPI bus bindings,
Documentation/devicetree/bindings/spi/spi-bus.txt
- spi-slave: Empty property indicating the SPI controller is used in slave mode.
- ready-gpios: GPIO used to signal a SPI master that the FIFO is filled
and we're ready to service a transfer. Only useful in slave mode.
Child nodes represent devices on the SPI bus
See ../spi/spi-bus.txt