linux-kernel - [PATCH 1/2] dt-bindings: pinctrl: renesas,r9a09g077: Document pin configuration properties

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Message-ID: <20251014191121.368475-2-prabhakar.mahadev-lad.rj@bp.renesas.com>
Date: Tue, 14 Oct 2025 20:11:20 +0100
From: Prabhakar <prabhakar.csengg@...il.com>
To: Geert Uytterhoeven <geert+renesas@...der.be>,
	Linus Walleij <linus.walleij@...aro.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Magnus Damm <magnus.damm@...il.com>
Cc: linux-renesas-soc@...r.kernel.org,
	linux-gpio@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Prabhakar <prabhakar.csengg@...il.com>,
	Biju Das <biju.das.jz@...renesas.com>,
	Fabrizio Castro <fabrizio.castro.jz@...esas.com>,
	Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: [PATCH 1/2] dt-bindings: pinctrl: renesas,r9a09g077: Document pin configuration properties

From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>

Document the pin configuration properties supported by the RZ/T2H pinctrl
driver. The RZ/T2H SoC supports configuring various electrical properties
through the DRCTLm (I/O Buffer Function Switching) registers.

Add documentation for the following standard properties:
- bias-disable, bias-pull-up, bias-pull-down: Control internal
  pull-up/pull-down resistors (3 options: no pull, pull-up, pull-down)
- input-schmitt-enable, input-schmitt-disable: Control Schmitt trigger
  input
- slew-rate: Control output slew rate (2 options: slow/fast)

Add documentation for the custom property:
- renesas,drive-strength: Control output drive strength using discrete
  levels (0-3) representing low, medium, high, and ultra high strength.
  This custom property is needed because the hardware uses fixed discrete
  levels rather than configurable milliamp values.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
---
 .../bindings/pinctrl/renesas,r9a09g077-pinctrl.yaml | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/Documentation/devicetree/bindings/pinctrl/renesas,r9a09g077-pinctrl.yaml b/Documentation/devicetree/bindings/pinctrl/renesas,r9a09g077-pinctrl.yaml
index 36d665971484..9085d5cfb1c8 100644
--- a/Documentation/devicetree/bindings/pinctrl/renesas,r9a09g077-pinctrl.yaml
+++ b/Documentation/devicetree/bindings/pinctrl/renesas,r9a09g077-pinctrl.yaml
@@ -72,6 +72,19 @@ definitions:
       input: true
       input-enable: true
       output-enable: true
+      bias-disable: true
+      bias-pull-down: true
+      bias-pull-up: true
+      input-schmitt-enable: true
+      input-schmitt-disable: true
+      slew-rate:
+        enum: [0, 1]
+      renesas,drive-strength:
+        description:
+          Drive strength configuration value. Valid values are 0 to 3, representing
+          increasing drive strength from low, medium, high and ultra high.
+        $ref: /schemas/types.yaml#/definitions/uint32
+        enum: [0, 1, 2, 3]
     oneOf:
       - required: [pinmux]
       - required: [pins]
-- 
2.43.0