linux-kernel - [PATCH 1/2] dt-bindings: serial: Add binding for software flow control in STM32 UART

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Message-Id: <20200412180923.30774-2-mani@kernel.org>
Date:   Sun, 12 Apr 2020 23:39:22 +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,
        Manivannan Sadhasivam <mani@...nel.org>
Subject: [PATCH 1/2] dt-bindings: serial: Add binding for software flow control in STM32 UART

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

Add devicetree binding for software flow control in STM32 UART
controller. While at it, let's also fix one schema error reported by
`make dtbs_check`.

Signed-off-by: Manivannan Sadhasivam <mani@...nel.org>
---

Rob: Still the `dtbs_check` validation fails. This is due to the
`linux,rs485-enabled-at-boot-time` property. I don't have any idea on how
to fix this.

 .../devicetree/bindings/serial/st,stm32-uart.yaml | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/serial/st,stm32-uart.yaml b/Documentation/devicetree/bindings/serial/st,stm32-uart.yaml
index 238c44192d31..ea5797a1b403 100644
--- a/Documentation/devicetree/bindings/serial/st,stm32-uart.yaml
+++ b/Documentation/devicetree/bindings/serial/st,stm32-uart.yaml
@@ -38,13 +38,26 @@ properties:
     description: enable hardware flow control
     $ref: /schemas/types.yaml#/definitions/flag
 
+  st,sw-flow-ctrl:
+    description: enable software flow control
+    $ref: /schemas/types.yaml#/definitions/flag
+
+  rts-gpios:
+    description: RTS pin used if st,sw-flow-ctrl is true
+    maxItems: 1
+
+  cts-gpios:
+    description: CTS pin used if st,sw-flow-ctrl is true
+    maxItems: 1
+
   dmas:
     minItems: 1
     maxItems: 2
 
   dma-names:
     items:
-      enum: [ rx, tx ]
+      - const: rx
+      - const: tx
     minItems: 1
     maxItems: 2
 
-- 
2.17.1