linux-kernel - [PATCH v3 1/6] dt-bindings: firmware: arm,scmi: Add properties for i.MX95 Pinctrl OEM extensions

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Message-Id: <20240428-pinctrl-scmi-oem-v3-v3-1-eda341eb47ed@nxp.com>
Date: Sun, 28 Apr 2024 13:07:47 +0800
From: "Peng Fan (OSS)" <peng.fan@....nxp.com>
To: Sudeep Holla <sudeep.holla@....com>, 
 Cristian Marussi <cristian.marussi@....com>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>, 
 Sascha Hauer <s.hauer@...gutronix.de>, 
 Pengutronix Kernel Team <kernel@...gutronix.de>, 
 Fabio Estevam <festevam@...il.com>, 
 Linus Walleij <linus.walleij@...aro.org>, 
 Dong Aisheng <aisheng.dong@....com>, Jacky Bai <ping.bai@....com>
Cc: linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, imx@...ts.linux.dev, 
 linux-gpio@...r.kernel.org, Peng Fan <peng.fan@....com>
Subject: [PATCH v3 1/6] dt-bindings: firmware: arm,scmi: Add properties for
 i.MX95 Pinctrl OEM extensions

From: Peng Fan <peng.fan@....com>

i.MX95 Pinctrl is managed by System Control Management Interface(SCMI)
firmware using OEM extensions. No functions, no groups are provided by
the firmware. To reuse generic properties, add the binding to enable
pinmux, slew-rate, bias-pull-up and etc, under a subnode of '-pins'.

Signed-off-by: Peng Fan <peng.fan@....com>
---
 .../devicetree/bindings/firmware/arm,scmi.yaml     |  9 ++++--
 .../bindings/firmware/nxp,imx95-scmi-pinctrl.yaml  | 37 ++++++++++++++++++++++
 2 files changed, 43 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/firmware/arm,scmi.yaml b/Documentation/devicetree/bindings/firmware/arm,scmi.yaml
index 7de2c29606e5..bd4dfd7a85cd 100644
--- a/Documentation/devicetree/bindings/firmware/arm,scmi.yaml
+++ b/Documentation/devicetree/bindings/firmware/arm,scmi.yaml
@@ -262,9 +262,12 @@ properties:
     patternProperties:
       '-pins$':
         type: object
-        allOf:
-          - $ref: /schemas/pinctrl/pincfg-node.yaml#
-          - $ref: /schemas/pinctrl/pinmux-node.yaml#
+        anyOf:
+          - $ref: /schemas/firmware/nxp,imx95-scmi-pinctrl.yaml
+          - allOf:
+              - $ref: /schemas/pinctrl/pincfg-node.yaml#
+              - $ref: /schemas/pinctrl/pinmux-node.yaml#
+
         unevaluatedProperties: false
 
         description:
diff --git a/Documentation/devicetree/bindings/firmware/nxp,imx95-scmi-pinctrl.yaml b/Documentation/devicetree/bindings/firmware/nxp,imx95-scmi-pinctrl.yaml
new file mode 100644
index 000000000000..1a694881f193
--- /dev/null
+++ b/Documentation/devicetree/bindings/firmware/nxp,imx95-scmi-pinctrl.yaml
@@ -0,0 +1,37 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+# Copyright 2024 NXP
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/firmware/nxp,imx95-scmi-pinctrl.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: i.MX System Control and Management Interface (SCMI) Pinctrl Protocol
+
+maintainers:
+  - Peng Fan <peng.fan@....com>
+
+patternProperties:
+  'grp[0-9a-f]$':
+    type: object
+    unevaluatedProperties: false
+
+    properties:
+      pinmux:
+        description: |
+          An integer array for representing pinmux configurations of
+          a device. Each integer has the format, pinid[31:21], mux[20:16],
+          daisy_value[15:12], daisy_valid[11:11], daisy_id[10:0].
+        $ref: /schemas/types.yaml#/definitions/uint32-array
+
+      drive-strength:
+        enum: [ 0, 1, 3, 7, 15, 31, 63 ]
+
+      slew-rate:
+        enum: [2, 3]
+
+      input-schmitt-enable: true
+      drive-open-drain: true
+      bias-pull-up: true
+      bias-pull-down: true
+
+additionalProperties: true

-- 
2.37.1