[PATCH v2 10/22] dt-bindings: pinctrl: Add starfive,jhb100-sys2-pinctrl

[Changhuang Liang <changhuang.liang@starfivetech.com>]

Add pinctrl bindings for StarFive JHB100 SoC System-2(sys2) pinctrl
controller.

System-2 domain also supports configuring the pin group voltage.
Add relevant definitions for power-source configuration.

Signed-off-by: Changhuang Liang <changhuang.liang@starfivetech.com>
---
 .../pinctrl/starfive,jhb100-sys2-pinctrl.yaml | 173 ++++++++++++++++++
 .../pinctrl/starfive,jhb100-pinctrl.h         |  44 +++++
 2 files changed, 217 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pinctrl/starfive,jhb100-sys2-pinctrl.yaml

diff --git a/Documentation/devicetree/bindings/pinctrl/starfive,jhb100-sys2-pinctrl.yaml b/Documentation/devicetree/bindings/pinctrl/starfive,jhb100-sys2-pinctrl.yaml
new file mode 100644
index 000000000000..3281c9433281
--- /dev/null
+++ b/Documentation/devicetree/bindings/pinctrl/starfive,jhb100-sys2-pinctrl.yaml
@@ -0,0 +1,173 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pinctrl/starfive,jhb100-sys2-pinctrl.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: StarFive JHB100 System-2 Pin Controller
+
+description: |
+  Pinctrl bindings for JHB100 RISC-V SoC from StarFive Technology Ltd.
+
+  The JHB100 SoC has 13 pinctrl domains - sys0, sys0h, sys1, sys2, per0, per1,
+  per2, per2pok, per3, adc0, adc1, emmc, and vga.
+  This document provides an overview of the "sys2" pinctrl domain.
+
+  The "sys2" domain has a pin controller which provides
+  - function selection for GPIO pads.
+  - GPIO pad configuration.
+  - GPIO interrupt handling.
+
+  In the SYS2 Pin Controller, there are 37 multi-function GPIO_PADs. Each of
+  them can be multiplexed to different hardware blocks through function
+  selection. Each iopad has a maximum of up to 4 functions - 0, 1, 2, and 3.
+  Function 0 is the default function which is the GPIO function.
+  Function 1, 2, and 3 are the alternate functions or peripheral signals that
+  can be routed to the iopad. The function selection can be carried out by
+  writing the function number to the iopad function select register.
+
+  Each iopad is configurable with parameters such as input-enable, internal
+  pull-up/pull-down bias, drive strength, schmitt trigger, slew rate,  input
+  debounce nanoseconds, power source and drive type  (open-drain or push-pull).
+
+maintainers:
+  - Alex Soo <yuklin.soo@starfivetech.com>
+
+properties:
+  compatible:
+    items:
+      - const: starfive,jhb100-sys2-pinctrl
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  resets:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  interrupt-controller: true
+
+  '#interrupt-cells':
+    const: 3
+
+  gpio-controller: true
+
+  '#gpio-cells':
+    const: 3
+
+  gpio-ranges: true
+
+  gpio-line-names: true
+
+patternProperties:
+  '-grp$':
+    type: object
+    additionalProperties: false
+    patternProperties:
+      '-pins$':
+        type: object
+        description: |
+          A pinctrl node should contain at least one subnode representing the
+          pinctrl groups available in the domain. Each subnode will list the
+          pins it needs, and how they should be configured, with regard to
+          function selection, bias, input enable/disable, input schmitt
+          trigger enable/disable, slew-rate, input debounce nanoseconds,
+          drive-open-drain, drive-push-pull, power-source and drive-strength.
+        allOf:
+          - $ref: /schemas/pinctrl/pincfg-node.yaml
+          - $ref: /schemas/pinctrl/pinmux-node.yaml
+        unevaluatedProperties: false
+
+        properties:
+          pins:
+            description:
+              The list of IOs that properties in the pincfg node apply to.
+
+          function:
+            description:
+              A string containing the name of the function to mux for these
+              pins.
+            enum: [ gpio, host0_port80, host1_port80, jtag, smbalert, uart ]
+
+          bias-disable: true
+
+          bias-pull-down:
+            type: boolean
+
+          bias-pull-up:
+            oneOf:
+              - type: boolean
+              - enum: [ 600, 900, 1200, 2000 ]
+                description: Pull up RSEL type resistance values (in ohms)
+            description:
+              For normal pull up type there is no need to specify a resistance
+              value, hence this can be specified as a boolean property.
+              For RSEL pull up type a resistance value (in ohms) can be added.
+
+          drive-open-drain: true
+
+          drive-push-pull: true
+
+          drive-strength:
+            enum: [ 2, 4, 8, 12 ]
+
+          drive-strength-microamp:
+            enum: [ 2000, 4000, 8000, 12000 ]
+
+          input-debounce-nanoseconds:
+            minimum: 0
+            maximum: 4294967295
+
+          input-disable: true
+
+          input-enable: true
+
+          input-schmitt-enable: true
+
+          input-schmitt-disable: true
+
+          power-source:
+             enum: [ 0, 1, 2 ]
+
+          slew-rate:
+            enum: [ 0, 1 ]
+            default: 0
+            description: |
+                0: slow (half frequency)
+                1: fast
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - interrupt-controller
+  - '#interrupt-cells'
+  - gpio-controller
+  - '#gpio-cells'
+  - gpio-ranges
+
+additionalProperties: false
+
+examples:
+  - |
+    soc {
+        #address-cells = <2>;
+        #size-cells = <2>;
+
+        pinctrl_sys2: pinctrl@13082000 {
+            compatible = "starfive,jhb100-sys2-pinctrl";
+            reg = <0x0 0x13082000 0x0 0x1000>;
+            interrupts = <59>;
+            interrupt-controller;
+            #interrupt-cells = <3>;
+            gpio-controller;
+            #gpio-cells = <3>;
+            gpio-ranges = <&pinctrl_sys2 0 0 0 32>,
+                          <&pinctrl_sys2 1 0 32 5>;
+        };
+    };
diff --git a/include/dt-bindings/pinctrl/starfive,jhb100-pinctrl.h b/include/dt-bindings/pinctrl/starfive,jhb100-pinctrl.h
index 30704a5a3418..89d344763540 100644
--- a/include/dt-bindings/pinctrl/starfive,jhb100-pinctrl.h
+++ b/include/dt-bindings/pinctrl/starfive,jhb100-pinctrl.h
@@ -38,4 +38,48 @@
 #define PADNUM_SYS1_GPIO_A22				6
 #define PADNUM_SYS1_GPIO_A23				7
 
+/* sys2 pad numbers */
+#define PADNUM_SYS2_GPIO_A24				0
+#define PADNUM_SYS2_GPIO_A25				1
+#define PADNUM_SYS2_GPIO_A26				2
+#define PADNUM_SYS2_GPIO_A27				3
+#define PADNUM_SYS2_GPIO_A28				4
+#define PADNUM_SYS2_GPIO_A29				5
+#define PADNUM_SYS2_GPIO_A30				6
+#define PADNUM_SYS2_GPIO_A31				7
+#define PADNUM_SYS2_GPIO_A32				8
+#define PADNUM_SYS2_GPIO_A33				9
+#define PADNUM_SYS2_GPIO_A34				10
+#define PADNUM_SYS2_GPIO_A35				11
+#define PADNUM_SYS2_GPIO_A36				12
+#define PADNUM_SYS2_GPIO_A37				13
+#define PADNUM_SYS2_GPIO_A38				14
+#define PADNUM_SYS2_GPIO_A39				15
+#define PADNUM_SYS2_GPIO_A40				16
+#define PADNUM_SYS2_GPIO_A41				17
+#define PADNUM_SYS2_GPIO_A42				18
+#define PADNUM_SYS2_GPIO_A43				19
+#define PADNUM_SYS2_GPIO_A44				20
+#define PADNUM_SYS2_GPIO_A45				21
+#define PADNUM_SYS2_GPIO_A46				22
+#define PADNUM_SYS2_GPIO_A47				23
+#define PADNUM_SYS2_GPIO_A48				24
+#define PADNUM_SYS2_GPIO_A49				25
+#define PADNUM_SYS2_GPIO_A50				26
+#define PADNUM_SYS2_GPIO_A51				27
+#define PADNUM_SYS2_GPIO_A52				28
+#define PADNUM_SYS2_GPIO_A53				29
+#define PADNUM_SYS2_GPIO_A54				30
+#define PADNUM_SYS2_GPIO_A55				31
+#define PADNUM_SYS2_GPIO_A56				32
+#define PADNUM_SYS2_GPIO_A57				33
+#define PADNUM_SYS2_GPIO_A58				34
+#define PADNUM_SYS2_GPIO_A59				35
+#define PADNUM_SYS2_GPIO_A60				36
+
+/* pinctrl hog power-source value */
+#define JHB100_PINVREF_3_3V				0
+#define JHB100_PINVREF_2_5V				1
+#define JHB100_PINVREF_1_8V				2
+
 #endif
-- 
2.25.1