diff mbox series

[5/8] dt-bindings: serial: stm32: update rts-gpios and cts-gpios

Message ID 20201218190020.1572-6-erwan.leray@foss.st.com
State New
Headers show
Series STM32 uart cleanup and improvements | expand

Commit Message

Erwan LE RAY Dec. 18, 2020, 7 p.m. UTC 
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.

Signed-off-by: Erwan Le Ray <erwan.leray@foss.st.com>

Comments

Rob Herring Dec. 31, 2020, 8:37 p.m. UTC | #1 
On Fri, 18 Dec 2020 20:00:16 +0100, Erwan Le Ray wrote:
> 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.

> 

> Signed-off-by: Erwan Le Ray <erwan.leray@foss.st.com>

> 


Acked-by: Rob Herring <robh@kernel.org>
diff mbox series

Patch

diff --git a/Documentation/devicetree/bindings/serial/st,stm32-uart.yaml b/Documentation/devicetree/bindings/serial/st,stm32-uart.yaml
index 06d5f251ec88..8631678283f9 100644
--- a/Documentation/devicetree/bindings/serial/st,stm32-uart.yaml
+++ b/Documentation/devicetree/bindings/serial/st,stm32-uart.yaml
@@ -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