From f6c911f3308c1cfb97ae1da6654080d7104e2df2 Mon Sep 17 00:00:00 2001 From: Tudor Ambarus Date: Thu, 17 Nov 2022 12:52:42 +0200 Subject: [PATCH] spi: dt-bindings: Introduce spi-cs-setup-ns property SPI NOR flashes have specific cs-setup time requirements without which they can't work at frequencies close to their maximum supported frequency, as they miss the first bits of the instruction command. Unrecognized commands are ignored, thus the flash will be unresponsive. Introduce the spi-cs-setup-ns property to allow spi devices to specify their cs setup time. Signed-off-by: Tudor Ambarus Link: https://lore.kernel.org/r/20221117105249.115649-2-tudor.ambarus@microchip.com Signed-off-by: Mark Brown --- .../devicetree/bindings/spi/spi-peripheral-props.yaml | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/Documentation/devicetree/bindings/spi/spi-peripheral-props.yaml b/Documentation/devicetree/bindings/spi/spi-peripheral-props.yaml index dca677f9e1b98..ead2cccf658fd 100644 --- a/Documentation/devicetree/bindings/spi/spi-peripheral-props.yaml +++ b/Documentation/devicetree/bindings/spi/spi-peripheral-props.yaml @@ -44,6 +44,11 @@ properties: description: Maximum SPI clocking speed of the device in Hz. + spi-cs-setup-ns: + description: + Delay in nanosecods to be introduced by the controller after CS is + asserted. + spi-rx-bus-width: description: Bus width to the SPI bus used for read transfers. -- 2.30.2