dt-bindings: soc: mobileye: add EyeQ OLB system controller

Add documentation to describe the "Other Logic Block" system-controller.
It deals with three platforms: EyeQ5, EyeQ6L and EyeQ6H. First two have
a single instance, whereas EyeQ6H has seven named instances.

Features provided are:
 - Clocks, children to main crystal. Some PLLs and divider clocks.
 - Resets. Some instances DO NOT have reset.
 - Pinctrl. Only EyeQ5 has such feature.

Those are NOT the only features exposed in OLB system-controllers! Many
individual registers, related to IP block integration, can be found.
Additional features will be exposed over time.

We simplify devicetree phandles to OLB in two ways:

 - Compatibles exposing a single clock do not ask for a index argument.
   This means we use EyeQ6H OLB south (it has four clocks):

      clocks = <&olb_south EQ6HC_SOUTH_PLL_PER>;

   But use EyeQ6H OLB east (it has one clock):

      clocks = <&olb_east>;

 - Compatibles exposing a single reset domain do not ask for a domain
   index, only a reset index.
   This means we use EyeQ5 OLB (it has three domains):

     resets = <&olb 0 10>;

   But use EyeQ6H west reset (it has one domain):

      resets = <&olb_west 3>;

About pinctrl subnodes: all pins have two functionality, either GPIO or
something-else. The latter is pin dependent, we express constraints
using many if-then.

Reviewed-by: Rob Herring (Arm) <[email protected]>
Signed-off-by: Théo Lebrun <[email protected]>
Signed-off-by: Thomas Bogendoerfer <[email protected]>

Author: tleb

Documentation/devicetree/bindings/soc/mobileye/mobileye,eyeq5-olb.yaml

@@ -0,0 +1,374 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/soc/mobileye/mobileye,eyeq5-olb.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Mobileye EyeQ SoC system controller
+
+maintainers:
+  - Grégory Clement <[email protected]>
+  - Théo Lebrun <[email protected]>
+  - Vladimir Kondratiev <[email protected]>
+
+description:
+  OLB ("Other Logic Block") is a hardware block grouping smaller blocks. Clocks,
+  resets, pinctrl are being handled from here. EyeQ5 and EyeQ6L host a single
+  instance. EyeQ6H hosts seven instances.
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - mobileye,eyeq5-olb
+          - mobileye,eyeq6l-olb
+          - mobileye,eyeq6h-acc-olb
+          - mobileye,eyeq6h-central-olb
+          - mobileye,eyeq6h-east-olb
+          - mobileye,eyeq6h-west-olb
+          - mobileye,eyeq6h-south-olb
+          - mobileye,eyeq6h-ddr0-olb
+          - mobileye,eyeq6h-ddr1-olb
+      - const: syscon
+
+  reg:
+    maxItems: 1
+
+  '#reset-cells':
+    description:
+      First cell is domain and optional if compatible has a single reset domain.
+      Second cell is reset index inside that domain.
+    enum: [ 1, 2 ]
+
+  '#clock-cells':
+    description:
+      Cell is clock index. Optional if compatible has a single clock.
+    enum: [ 0, 1 ]
+
+  clocks:
+    maxItems: 1
+    description:
+      Input parent clock to all PLLs. Expected to be the main crystal.
+
+  clock-names:
+    const: ref
+
+patternProperties:
+  '-pins?$':
+    type: object
+    description: Pin muxing configuration.
+    $ref: /schemas/pinctrl/pinmux-node.yaml#
+    additionalProperties: false
+    properties:
+      pins: true
+      function:
+        enum: [gpio,
+               # Bank A
+               timer0, timer1, timer2, timer5, uart0, uart1, can0, can1, spi0,
+               spi1, refclk0,
+               # Bank B
+               timer3, timer4, timer6, uart2, can2, spi2, spi3, mclk0]
+      bias-disable: true
+      bias-pull-down: true
+      bias-pull-up: true
+      drive-strength: true
+    required:
+      - pins
+      - function
+    allOf:
+      - if:
+          properties:
+            function:
+              const: gpio
+        then:
+          properties:
+            pins:
+              items: # PA0 - PA28, PB0 - PB22
+                pattern: '^(P(A|B)1?[0-9]|PA2[0-8]|PB2[0-2])$'
+      - if:
+          properties:
+            function:
+              const: timer0
+        then:
+          properties:
+            pins:
+              items:
+                enum: [PA0, PA1]
+      - if:
+          properties:
+            function:
+              const: timer1
+        then:
+          properties:
+            pins:
+              items:
+                enum: [PA2, PA3]
+      - if:
+          properties:
+            function:
+              const: timer2
+        then:
+          properties:
+            pins:
+              items:
+                enum: [PA4, PA5]
+      - if:
+          properties:
+            function:
+              const: timer5
+        then:
+          properties:
+            pins:
+              items:
+                enum: [PA6, PA7, PA8, PA9]
+      - if:
+          properties:
+            function:
+              const: uart0
+        then:
+          properties:
+            pins:
+              items:
+                enum: [PA10, PA11]
+      - if:
+          properties:
+            function:
+              const: uart1
+        then:
+          properties:
+            pins:
+              items:
+                enum: [PA12, PA13]
+      - if:
+          properties:
+            function:
+              const: can0
+        then:
+          properties:
+            pins:
+              items:
+                enum: [PA14, PA15]
+      - if:
+          properties:
+            function:
+              const: can1
+        then:
+          properties:
+            pins:
+              items:
+                enum: [PA16, PA17]
+      - if:
+          properties:
+            function:
+              const: spi0
+        then:
+          properties:
+            pins:
+              items:
+                enum: [PA18, PA19, PA20, PA21, PA22]
+      - if:
+          properties:
+            function:
+              const: spi1
+        then:
+          properties:
+            pins:
+              items:
+                enum: [PA23, PA24, PA25, PA26, PA27]
+      - if:
+          properties:
+            function:
+              const: refclk0
+        then:
+          properties:
+            pins:
+              items:
+                enum: [PA28]
+      - if:
+          properties:
+            function:
+              const: timer3
+        then:
+          properties:
+            pins:
+              items:
+                enum: [PB0, PB1]
+      - if:
+          properties:
+            function:
+              const: timer4
+        then:
+          properties:
+            pins:
+              items:
+                enum: [PB2, PB3]
+      - if:
+          properties:
+            function:
+              const: timer6
+        then:
+          properties:
+            pins:
+              items:
+                enum: [PB4, PB5, PB6, PB7]
+      - if:
+          properties:
+            function:
+              const: uart2
+        then:
+          properties:
+            pins:
+              items:
+                enum: [PB8, PB9]
+      - if:
+          properties:
+            function:
+              const: can2
+        then:
+          properties:
+            pins:
+              items:
+                enum: [PB10, PB11]
+      - if:
+          properties:
+            function:
+              const: spi2
+        then:
+          properties:
+            pins:
+              items:
+                enum: [PB12, PB13, PB14, PB15, PB16]
+      - if:
+          properties:
+            function:
+              const: spi3
+        then:
+          properties:
+            pins:
+              items:
+                enum: [PB17, PB18, PB19, PB20, PB21]
+      - if:
+          properties:
+            function:
+              const: mclk0
+        then:
+          properties:
+            pins:
+              items:
+                enum: [PB22]
+
+required:
+  - compatible
+  - reg
+  - '#clock-cells'
+  - clocks
+  - clock-names
+
+additionalProperties: false
+
+allOf:
+    # Compatibles exposing a single reset domain.
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - mobileye,eyeq6h-acc-olb
+              - mobileye,eyeq6h-east-olb
+              - mobileye,eyeq6h-west-olb
+    then:
+      properties:
+        '#reset-cells':
+          const: 1
+      required:
+        - '#reset-cells'
+
+    # Compatibles exposing two reset domains.
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - mobileye,eyeq5-olb
+              - mobileye,eyeq6l-olb
+    then:
+      properties:
+        '#reset-cells':
+          const: 2
+      required:
+        - '#reset-cells'
+
+    # Compatibles not exposing resets.
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - mobileye,eyeq6h-central-olb
+              - mobileye,eyeq6h-south-olb
+              - mobileye,eyeq6h-ddr0-olb
+              - mobileye,eyeq6h-ddr1-olb
+    then:
+      properties:
+        '#reset-cells': false
+
+    # Compatibles exposing a single clock.
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - mobileye,eyeq6h-central-olb
+              - mobileye,eyeq6h-east-olb
+              - mobileye,eyeq6h-west-olb
+              - mobileye,eyeq6h-ddr0-olb
+              - mobileye,eyeq6h-ddr1-olb
+    then:
+      properties:
+        '#clock-cells':
+          const: 0
+    else:
+      properties:
+        '#clock-cells':
+          const: 1
+
+    # Only EyeQ5 has pinctrl in OLB.
+  - if:
+      not:
+        properties:
+          compatible:
+            contains:
+              const: mobileye,eyeq5-olb
+    then:
+      patternProperties:
+        '-pins?$': false
+
+examples:
+  - |
+    soc {
+      #address-cells = <2>;
+      #size-cells = <2>;
+
+      system-controller@e00000 {
+        compatible = "mobileye,eyeq5-olb", "syscon";
+        reg = <0 0xe00000 0x0 0x400>;
+        #reset-cells = <2>;
+        #clock-cells = <1>;
+        clocks = <&xtal>;
+        clock-names = "ref";
+      };
+    };
+  - |
+    soc {
+      #address-cells = <2>;
+      #size-cells = <2>;
+
+      system-controller@d2003000 {
+        compatible = "mobileye,eyeq6h-acc-olb", "syscon";
+        reg = <0x0 0xd2003000 0x0 0x1000>;
+        #reset-cells = <1>;
+        #clock-cells = <1>;
+        clocks = <&xtal>;
+        clock-names = "ref";
+      };
+    };