linux-kernel - [PATCH v3 1/2] dt-bindings: serial: Document CTS/RTS gpios in STM32 UART

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Date:   Mon, 20 Apr 2020 22:32:03 +0530
From:   mani@...nel.org
To:     gregkh@...uxfoundation.org, robh+dt@...nel.org,
        mcoquelin.stm32@...il.com, alexandre.torgue@...com
Cc:     linux-serial@...r.kernel.org, devicetree@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        fabrice.gasnier@...com, andy.shevchenko@...il.com,
        Manivannan Sadhasivam <mani@...nel.org>
Subject: [PATCH v3 1/2] dt-bindings: serial: Document CTS/RTS gpios in STM32 UART

From: Manivannan Sadhasivam <mani@...nel.org>

Document the use of CTS/RTS gpios for flow control in STM32 UART
controller. These properties can be used instead of 'st,hw-flow-ctrl'
for making use of any gpio pins for flow control instead of dedicated
pins. It should be noted that both CTS/RTS and 'st,hw-flow-ctrl'
properties cannot co-exist in a design.

Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
Signed-off-by: Manivannan Sadhasivam <mani@...nel.org>
---
 .../devicetree/bindings/serial/st,stm32-uart.yaml  | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/Documentation/devicetree/bindings/serial/st,stm32-uart.yaml b/Documentation/devicetree/bindings/serial/st,stm32-uart.yaml
index 238c44192d31..75b8521eb7cb 100644
--- a/Documentation/devicetree/bindings/serial/st,stm32-uart.yaml
+++ b/Documentation/devicetree/bindings/serial/st,stm32-uart.yaml
@@ -48,6 +48,12 @@ properties:
     minItems: 1
     maxItems: 2
 
+  cts-gpios:
+    maxItems: 1
+
+  rts-gpios:
+    maxItems: 1
+
   wakeup-source: true
 
   rs485-rts-delay: true
@@ -55,6 +61,14 @@ properties:
   linux,rs485-enabled-at-boot-time: true
   rs485-rx-during-tx: true
 
+if:
+  required:
+    - st,hw-flow-ctrl
+then:
+  properties:
+    cts-gpios: false
+    rts-gpios: false
+
 required:
   - compatible
   - reg
-- 
2.17.1