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dt-bindings: serial: stm32: update rts-gpios and cts-gpios

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Update rts-gpios and cts-gpios:
- remove max-items as already defined in serial.yaml
- add a note describing rts-gpios and cts-gpios usage with stm32

Document the use of cts-gpios and rts-gpios for flow control in STM32 UART
controller. These properties can be used instead of 'uart-has-rtscts' or
'st,hw-flow-ctrl' (deprecated) for making use of any gpio pins for flow
control instead of dedicated pins.
It should be noted that both cts-gpios/rts-gpios and 'uart-has-rtscts' or
'st,hw-flow-ctrl' (deprecated) properties cannot co-exist in a design.

Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Erwan Le Ray <erwan.leray@foss.st.com>
Link: https://lore.kernel.org/r/20210106162203.28854-6-erwan.leray@foss.st.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Erwan Le Ray 2021-01-06 17:22:00 +01:00 committed by Greg Kroah-Hartman
parent 8ebd966576
commit 9ba8377c3a
1 changed files with 8 additions and 5 deletions
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13
Documentation/devicetree/bindings/serial/st,stm32-uart.yaml
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@ -50,11 +50,14 @@ properties:
minItems: 1
maxItems: 2
cts-gpios:
maxItems: 1
rts-gpios:
maxItems: 1
# cts-gpios and rts-gpios properties can be used instead of 'uart-has-rtscts'
# or 'st,hw-flow-ctrl' (deprecated) for making use of any gpio pins for flow
# control instead of dedicated pins.
#
# It should be noted that both cts-gpios/rts-gpios and 'uart-has-rtscts' or
# 'st,hw-flow-ctrl' (deprecated) properties cannot co-exist in a design.
cts-gpios: true
rts-gpios: true
wakeup-source: true