linux-kernel - [PATCH v2 3/5] dt-bindings: pinctrl: document polarfire soc iomux0 pinmux

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Message-ID: <20251014-ravioli-ramrod-84b478186bb7@spud>
Date: Tue, 14 Oct 2025 15:35:36 +0100
From: Conor Dooley <conor@...nel.org>
To: linus.walleij@...aro.org
Cc: conor@...nel.org,
	Conor Dooley <conor.dooley@...rochip.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	linux-kernel@...r.kernel.org,
	linux-gpio@...r.kernel.org,
	devicetree@...r.kernel.org,
	Valentina.FernandezAlanis@...rochip.com
Subject: [PATCH v2 3/5] dt-bindings: pinctrl: document polarfire soc iomux0 pinmux

From: Conor Dooley <conor.dooley@...rochip.com>

On Polarfire SoC, iomux0 is responsible for routing functions to either
Multiprocessor Subsystem (MSS) IOs or to the FPGA fabric, where they
can either interface with custom RTL or be routed to the FPGA fabric's
IOs. Document it.

Signed-off-by: Conor Dooley <conor.dooley@...rochip.com>
---
 .../microchip,mpfs-pinctrl-iomux0.yaml        | 88 +++++++++++++++++++
 .../microchip,mpfs-mss-top-sysreg.yaml        | 13 ++-
 2 files changed, 100 insertions(+), 1 deletion(-)
 create mode 100644 Documentation/devicetree/bindings/pinctrl/microchip,mpfs-pinctrl-iomux0.yaml

diff --git a/Documentation/devicetree/bindings/pinctrl/microchip,mpfs-pinctrl-iomux0.yaml b/Documentation/devicetree/bindings/pinctrl/microchip,mpfs-pinctrl-iomux0.yaml
new file mode 100644
index 000000000000..2b718de83a83
--- /dev/null
+++ b/Documentation/devicetree/bindings/pinctrl/microchip,mpfs-pinctrl-iomux0.yaml
@@ -0,0 +1,88 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pinctrl/microchip,mpfs-pinctrl-iomux0.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Microchip PolarFire SoC iomux0
+
+maintainers:
+  - Conor Dooley <conor.dooley@...rochip.com>
+
+description:
+  iomux0 is responsible for routing some functions to either the FPGA fabric,
+  or to MSSIOs. It only performs muxing, and has no IO configuration role, as
+  fabric IOs are configured separately and just routing a function to MSSIOs is
+  not sufficient for it to actually get mapped to an MSSIO, just makes it
+  possible.
+
+properties:
+  compatible:
+    oneOf:
+      - const: microchip,mpfs-pinctrl-iomux0
+      - items:
+          - const: microchip,pic64gx-pinctrl-iomux0
+          - const: microchip,mpfs-pinctrl-iomux0
+
+  reg:
+    maxItems: 1
+
+  pinctrl-use-default: true
+
+patternProperties:
+  '^mux-':
+    type: object
+    additionalProperties: false
+
+    properties:
+      function:
+        description:
+          A string containing the name of the function to mux to the group.
+        enum: [ spi0, spi1, i2c0, i2c1, can0, can1, qspi, uart0, uart1, uart2,
+                uart3, uart4, mdio0, mdio1 ]
+
+      groups:
+        description:
+          An array of strings. Each string contains the name of a group.
+        items:
+          enum: [ spi0_fabric, spi0_mssio, spi1_fabric, spi1_mssio, i2c0_fabric,
+                  i2c0_mssio, i2c1_fabric, i2c1_mssio, can0_fabric, can0_mssio,
+                  can1_fabric, can1_mssio, qspi_fabric, qspi_mssio,
+                  uart0_fabric, uart0_mssio, uart1_fabric, uart1_mssio,
+                  uart2_fabric, uart2_mssio, uart3_fabric, uart3_mssio,
+                  uart4_fabric, uart4_mssio, mdio0_fabric, mdio0_mssio,
+                  mdio1_fabric, mdio1_mssio ]
+
+    required:
+      - function
+      - groups
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    soc {
+      #size-cells = <1>;
+      #address-cells = <1>;
+
+      pinctrl@200 {
+        compatible = "microchip,mpfs-pinctrl-iomux0";
+        reg = <0x200 0x4>;
+
+        mux-spi0-fabric {
+          function = "spi0";
+          groups = "spi0_fabric";
+        };
+
+        mux-spi1-mssio {
+          function = "spi1";
+          groups = "spi1_mssio";
+        };
+      };
+    };
+
+...
diff --git a/Documentation/devicetree/bindings/soc/microchip/microchip,mpfs-mss-top-sysreg.yaml b/Documentation/devicetree/bindings/soc/microchip/microchip,mpfs-mss-top-sysreg.yaml
index 1ab691db8795..39987f722411 100644
--- a/Documentation/devicetree/bindings/soc/microchip/microchip,mpfs-mss-top-sysreg.yaml
+++ b/Documentation/devicetree/bindings/soc/microchip/microchip,mpfs-mss-top-sysreg.yaml
@@ -18,10 +18,17 @@ properties:
     items:
       - const: microchip,mpfs-mss-top-sysreg
       - const: syscon
+      - const: simple-mfd
 
   reg:
     maxItems: 1
 
+  '#address-cells':
+    const: 1
+
+  '#size-cells':
+    const: 1
+
   '#reset-cells':
     description:
       The AHB/AXI peripherals on the PolarFire SoC have reset support, so
@@ -31,6 +38,10 @@ properties:
       of PolarFire clock/reset IDs.
     const: 1
 
+  pinctrl@200:
+    type: object
+    $ref: /schemas/pinctrl/microchip,mpfs-pinctrl-iomux0.yaml
+
 required:
   - compatible
   - reg
@@ -40,7 +51,7 @@ additionalProperties: false
 examples:
   - |
     syscon@...02000 {
-      compatible = "microchip,mpfs-mss-top-sysreg", "syscon";
+      compatible = "microchip,mpfs-mss-top-sysreg", "syscon", "simple-mfd";
       reg = <0x20002000 0x1000>;
       #reset-cells = <1>;
     };
-- 
2.51.0