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spi: stm32: add description about STM32F4 bindings 

Add description that STM32F4 can be used in compatible property.
Master Inter-Data Idleness optional property cannot be used in STM32F4.

Signed-off-by: Cezary Gapinski <cezary.gapinski@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
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Cezary Gapinski 2018-12-24 23:00:40 +01:00 committed by Mark Brown
parent 00505edf95
commit 560b097c77
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1 changed files with 6 additions and 3 deletions
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9
Documentation/devicetree/bindings/spi/spi-stm32.txt
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@ -7,7 +7,9 @@ from 4 to 32-bit data size. Although it can be configured as master or slave,
only master is supported by the driver.
Required properties:
- compatible: Must be "st,stm32h7-spi".
- compatible: Should be one of:
"st,stm32h7-spi"
"st,stm32f4-spi"
- reg: Offset and length of the device's register set.
- interrupts: Must contain the interrupt id.
- clocks: Must contain an entry for spiclk (which feeds the internal clock
@ -30,8 +32,9 @@ Child nodes represent devices on the SPI bus
See ../spi/spi-bus.txt
Optional properties:
- st,spi-midi-ns: (Master Inter-Data Idleness) minimum time delay in
nanoseconds inserted between two consecutive data frames.
- st,spi-midi-ns: Only for STM32H7, (Master Inter-Data Idleness) minimum time
delay in nanoseconds inserted between two consecutive data
frames.
Example: