linux-kernel - [RFC v2 3/3] dt-bindings: firmware: arm,scmi: Add support for pinctrl protocol

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Date:   Wed, 26 Apr 2023 13:26:38 +0000
From:   Oleksii Moisieiev <Oleksii_Moisieiev@...m.com>
To:     "sudeep.holla@....com" <sudeep.holla@....com>
CC:     Oleksii Moisieiev <Oleksii_Moisieiev@...m.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Cristian Marussi <cristian.marussi@....com>,
        Peng Fan <peng.fan@....nxp.com>,
        Michal Simek <michal.simek@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>
Subject: [RFC v2 3/3] dt-bindings: firmware: arm,scmi: Add support for pinctrl
 protocol

Add new SCMI v3.2 pinctrl protocol bindings definitions and example.

Signed-off-by: Oleksii Moisieiev <oleksii_moisieiev@...m.com>
---
 .../bindings/firmware/arm,scmi.yaml           | 77 +++++++++++++++++++
 1 file changed, 77 insertions(+)

diff --git a/Documentation/devicetree/bindings/firmware/arm,scmi.yaml b/Documentation/devicetree/bindings/firmware/arm,scmi.yaml
index 2f7c51c75e85..41ba5b8d8151 100644
--- a/Documentation/devicetree/bindings/firmware/arm,scmi.yaml
+++ b/Documentation/devicetree/bindings/firmware/arm,scmi.yaml
@@ -212,6 +212,63 @@ properties:
       reg:
         const: 0x18
 
+  protocol@19:
+    $ref: '#/$defs/protocol-node'
+
+    properties:
+      reg:
+        const: 0x19
+
+      '#pinctrl-cells':
+        const: 0
+
+    allOf:
+      - $ref: "/schemas/pinctrl/pinctrl.yaml#"
+
+    required:
+      - reg
+
+    additionalProperties:
+      anyOf:
+        - type: object
+          allOf:
+            - $ref: /schemas/pinctrl/pincfg-node.yaml#
+            - $ref: /schemas/pinctrl/pinmux-node.yaml#
+
+          description:
+            A pin multiplexing sub-node describe how to configure a
+            set of pins is some desired function.
+            A single sub-node may define several pin configurations.
+            This sub-node is using default pinctrl bindings to configure
+            pin multiplexing and using SCMI protocol to apply specified
+            configuration using SCMI protocol.
+
+          properties:
+            phandle: true
+            function: true
+            groups: true
+            pins: true
+            bias-bus-hold: true
+            bias-disable: true
+            bias-high-impedance: true
+            bias-pull-up: true
+            bias-pull-default: true
+            bias-pull-down: true
+            drive-open-drain: true
+            drive-open-source: true
+            drive-push-pull: true
+            drive-strength: true
+            input-debounce: true
+            input-value: true
+            input-schmitt: true
+            low-power-mode: true
+            output-mode: true
+            output-value: true
+            power-source: true
+            skew-rate: true
+
+          additionalProperties: true
+
 additionalProperties: false
 
 $defs:
@@ -356,6 +413,26 @@ examples:
             scmi_powercap: protocol@18 {
                 reg = <0x18>;
             };
+
+            scmi_pinctrl: protocol@19 {
+                reg = <0x19>;
+                #pinctrl-cells = <0>;
+
+                i2c2 {
+                    groups = "i2c2_a", "i2c2_b";
+                    function = "i2c2";
+                };
+
+                pins_mdio {
+                    groups = "avb_mdio";
+                    drive-strength = <24>;
+                };
+
+                keys_pins: keys {
+                    pins = "GP_5_17", "GP_5_20", "GP_5_22", "GP_2_1";
+                    bias-pull-up;
+                };
+            };
         };
     };
 
-- 
2.25.1