linux-kernel - [PATCH v2 2/9] dt-bindings: pincfg-node: Add property "skew-delay-direction"

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Message-ID: <20250905135547.934729-3-antonio.borneo@foss.st.com>
Date: Fri, 5 Sep 2025 15:55:40 +0200
From: Antonio Borneo <antonio.borneo@...s.st.com>
To: Linus Walleij <linus.walleij@...aro.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue
	<alexandre.torgue@...s.st.com>,
        Bartosz Golaszewski <brgl@...ev.pl>, <linux-gpio@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>
CC: Antonio Borneo <antonio.borneo@...s.st.com>,
        Christophe Roullier
	<christophe.roullier@...s.st.com>,
        Fabien Dessenne
	<fabien.dessenne@...s.st.com>,
        Valentin Caron <valentin.caron@...s.st.com>
Subject: [PATCH v2 2/9] dt-bindings: pincfg-node: Add property "skew-delay-direction"

Add the property "skew-delay-direction" to specify on which pin's
direction (either input, output or both) the value of the generic
property 'skew-delay' applies.
For backward compatibility, 'skew-delay' applies on both input and
output directions when the new property is not present or has
value '0'.

Signed-off-by: Antonio Borneo <antonio.borneo@...s.st.com>
---
 .../devicetree/bindings/pinctrl/pincfg-node.yaml    | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/pinctrl/pincfg-node.yaml b/Documentation/devicetree/bindings/pinctrl/pincfg-node.yaml
index cbfcf215e571d..dd3b8cb817ff7 100644
--- a/Documentation/devicetree/bindings/pinctrl/pincfg-node.yaml
+++ b/Documentation/devicetree/bindings/pinctrl/pincfg-node.yaml
@@ -151,6 +151,17 @@ properties:
       this affects the expected clock skew on input pins
       and the delay before latching a value to an output
       pin. Typically indicates how many double-inverters are
-      used to delay the signal.
+      used to delay the signal. The delay is assumed as present
+      on both input and output directions of the pins, unless
+      otherwise specified by the property "skew-delay-direction"
+
+  skew-delay-direction:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [0, 1, 2]
+    default: 0
+    description: |
+      0: skew-delay applies to both input and output directions
+      1: skew-delay applies only to the output direction
+      2: skew-delay applies only to the input direction
 
 additionalProperties: true
-- 
2.34.1