dt-bindings: pinctrl: Add aspeed,ast2700-soc0-pinctrl

Add a device tree binding for the pin controller found in the
ASPEED AST2700 SoC0.

The controller manages various peripheral functions such as eMMC, USB,
VGA DDC, JTAG, and PCIe root complex signals.

Describe the AST2700 SoC0 pin controller using standard pin multiplexing
and configuration properties.

Signed-off-by: Billy Tsai <billy_tsai@aspeedtech.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Linus Walleij <linusw@kernel.org>

diff --git a/Documentation/devicetree/bindings/pinctrl/aspeed,ast2700-soc0-pinctrl.yaml b/Documentation/devicetree/bindings/pinctrl/aspeed,ast2700-soc0-pinctrl.yaml
new file mode 100644 (file)
index 0000000..407a64f
--- /dev/null
+++ b/Documentation/devicetree/bindings/pinctrl/aspeed,ast2700-soc0-pinctrl.yaml
@@ -0,0 +1,188 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pinctrl/aspeed,ast2700-soc0-pinctrl.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: ASPEED AST2700 SoC0 Pin Controller
+
+maintainers:
+  - Billy Tsai <billy_tsai@aspeedtech.com>
+
+description: >
+  The AST2700 features a dual-SoC architecture with two interconnected SoCs,
+  each having its own System Control Unit (SCU) for independent pin control.
+  This pin controller manages the pin multiplexing for SoC0.
+
+  The SoC0 pin controller manages pin functions including eMMC, VGA DDC,
+  dual USB3/USB2 ports (A and B), JTAG, and PCIe root complex interfaces.
+
+properties:
+  compatible:
+    const: aspeed,ast2700-soc0-pinctrl
+
+  reg:
+    maxItems: 1
+
+patternProperties:
+  '-state$':
+    description: |
+      Pin control state.
+
+      If 'function' is present, the node describes a pinmux state and must
+      specify 'groups'.
+
+      For pin configuration, exactly one of 'groups' or 'pins' must be
+      specified in each state node. Group-level configuration applies to all
+      pins in the group. Pin-level configuration may be supplied in a
+      separate state node for individual pins; when both group-level and
+      pin-level configuration apply to the same pin, the pin-level
+      configuration takes precedence.
+
+    type: object
+    allOf:
+      - $ref: pinmux-node.yaml#
+      - $ref: pincfg-node.yaml#
+      - if:
+          required:
+            - function
+        then:
+          required:
+            - groups
+      - oneOf:
+          - required:
+              - groups
+          - required:
+              - pins
+
+    additionalProperties: false
+
+    properties:
+      function:
+        enum:
+          - EMMC
+          - JTAGDDR
+          - JTAGM0
+          - JTAGPCIEA
+          - JTAGPCIEB
+          - JTAGPSP
+          - JTAGSSP
+          - JTAGTSP
+          - JTAGUSB3A
+          - JTAGUSB3B
+          - PCIERC0PERST
+          - PCIERC1PERST
+          - TSPRSTN
+          - UFSCLKI
+          - USB2AD0
+          - USB2AD1
+          - USB2AH
+          - USB2AHP
+          - USB2AHPD0
+          - USB2AXH
+          - USB2AXH2B
+          - USB2AXHD1
+          - USB2AXHP
+          - USB2AXHP2B
+          - USB2AXHPD1
+          - USB2BD0
+          - USB2BD1
+          - USB2BH
+          - USB2BHP
+          - USB2BHPD0
+          - USB2BXH
+          - USB2BXH2A
+          - USB2BXHD1
+          - USB2BXHP
+          - USB2BXHP2A
+          - USB2BXHPD1
+          - USB3AXH
+          - USB3AXH2B
+          - USB3AXHD
+          - USB3AXHP
+          - USB3AXHP2B
+          - USB3AXHPD
+          - USB3BXH
+          - USB3BXH2A
+          - USB3BXHD
+          - USB3BXHP
+          - USB3BXHP2A
+          - USB3BXHPD
+          - VB
+          - VGADDC
+
+      groups:
+        enum:
+          - EMMCCDN
+          - EMMCG1
+          - EMMCG4
+          - EMMCG8
+          - EMMCWPN
+          - JTAG0
+          - PCIERC0PERST
+          - PCIERC1PERST
+          - TSPRSTN
+          - UFSCLKI
+          - USB2A
+          - USB2AAP
+          - USB2ABP
+          - USB2ADAP
+          - USB2AH
+          - USB2AHAP
+          - USB2B
+          - USB2BAP
+          - USB2BBP
+          - USB2BDBP
+          - USB2BH
+          - USB2BHBP
+          - USB3A
+          - USB3AAP
+          - USB3ABP
+          - USB3B
+          - USB3BAP
+          - USB3BBP
+          - VB0
+          - VB1
+          - VGADDC
+
+      pins:
+        enum:
+          - AB13
+          - AB14
+          - AC13
+          - AC14
+          - AD13
+          - AD14
+          - AE13
+          - AE14
+          - AE15
+          - AF13
+          - AF14
+          - AF15
+
+      drive-strength:
+        enum: [3, 6, 8, 11, 16, 18, 20, 23, 30, 32, 33, 35, 37, 38, 39, 41]
+
+      bias-disable: true
+      bias-pull-up: true
+      bias-pull-down: true
+
+required:
+  - compatible
+  - reg
+
+allOf:
+  - $ref: pinctrl.yaml#
+
+additionalProperties: false
+
+examples:
+  - |
+    pinctrl@400 {
+        compatible = "aspeed,ast2700-soc0-pinctrl";
+        reg = <0x400 0x318>;
+        emmc-state {
+            function = "EMMC";
+            groups = "EMMCG1";
+        };
+    };