On 17/11/2022 22:03, Bernhard Rosenkränzer wrote:

Add devicetree bindings for Mediatek MT8365 pinctrl driver.

Signed-off-by: Bernhard Rosenkränzer <redacted>

Thank you for your patch. There is something to discuss/improve.

+
+  pins-are-numbered:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description: |
+      Specify the subnodes are using numbered pinmux to specify pins.

Why would you name pins differently per board? And why this different
naming of the same pins is a property of hardware?

This looks like something to drop.

+
+  gpio-controller: true
+
+  "#gpio-cells":
+    const: 2
+    description: |
+      Number of cells in GPIO specifier. Since the generic GPIO
+      binding is used, the amount of cells must be specified as 2. See the below
+      mentioned gpio binding representation for description of particular cells.
+
+  interrupt-controller: true
+
+  interrupts:
+    maxItems: 1
+
+  "#interrupt-cells":
+    const: 2
+
+required:
+  - compatible
+  - reg
+  - gpio-controller
+  - "#gpio-cells"
+
+allOf:
+  - $ref: pinctrl.yaml#
+
+patternProperties:

patternProperties go before "required:" block.

+  '-pins$':
+    type: object
+    additionalProperties: false
+    patternProperties:
+      'pins':

How about anchoring it to either prefix or suffix? ^pins or pins$.

+        type: object
+        additionalProperties: false
+        description: |
+          A pinctrl node should contain at least one subnode representing the
+          pinctrl groups available on the machine. Each subnode will list the
+          pins it needs, and how they should be configured, with regard to muxer
+          configuration, pullups, drive strength, input enable/disable and input
+          schmitt.
+        $ref: "/schemas/pinctrl/pincfg-node.yaml"

Drop quotes.

+
+        properties:
+          pinmux:
+            description:
+              integer array, represents gpio pin number and mux setting.
+              Supported pin number and mux varies for different SoCs, and are
+              defined as macros in <soc>-pinfunc.h directly.
+
+          bias-disable: true
+
+          bias-pull-up:
+            description: |
+              Besides generic pinconfig options, it can be used as the pull up
+              settings for 2 pull resistors, R0 and R1. User can configure those
+              special pins.
+
+          bias-pull-down: true
+
+          input-enable: true
+
+          input-disable: true
+
+          output-low: true
+
+          output-high: true
+
+          input-schmitt-enable: true
+
+          input-schmitt-disable: true
+
+          mediatek,drive-strength-adv:
+            description: |
+              Describe the specific driving setup property.
+              For I2C pins, the existing generic driving setup can only support
+              2/4/6/8/10/12/14/16mA driving. But in specific driving setup, they
+              can support 0.125/0.25/0.5/1mA adjustment. If we enable specific
+              driving setup, the existing generic setup will be disabled.
+              The specific driving setup is controlled by E1E0EN.
+              When E1=0/E0=0, the strength is 0.125mA.
+              When E1=0/E0=1, the strength is 0.25mA.
+              When E1=1/E0=0, the strength is 0.5mA.
+              When E1=1/E0=1, the strength is 1mA.
+              EN is used to enable or disable the specific driving setup.
+              Valid arguments are described as below:
+              0: (E1, E0, EN) = (0, 0, 0)
+              1: (E1, E0, EN) = (0, 0, 1)
+              2: (E1, E0, EN) = (0, 1, 0)
+              3: (E1, E0, EN) = (0, 1, 1)
+              4: (E1, E0, EN) = (1, 0, 0)
+              5: (E1, E0, EN) = (1, 0, 1)
+              6: (E1, E0, EN) = (1, 1, 0)
+              7: (E1, E0, EN) = (1, 1, 1)
+              So the valid arguments are from 0 to 7.
+            $ref: /schemas/types.yaml#/definitions/uint32
+            enum: [0, 1, 2, 3, 4, 5, 6, 7]
+
+          mediatek,pull-up-adv:
+            description: |
+              Pull up setings for 2 pull resistors, R0 and R1. User can
+              configure those special pins. Valid arguments are described as below:
+              0: (R1, R0) = (0, 0) which means R1 disabled and R0 disabled.
+              1: (R1, R0) = (0, 1) which means R1 disabled and R0 enabled.
+              2: (R1, R0) = (1, 0) which means R1 enabled and R0 disabled.
+              3: (R1, R0) = (1, 1) which means R1 enabled and R0 enabled.
+            $ref: /schemas/types.yaml#/definitions/uint32
+            enum: [0, 1, 2, 3]
+
+          mediatek,pull-down-adv:
+            description: |
+              Pull down settings for 2 pull resistors, R0 and R1. User can
+              configure those special pins. Valid arguments are described as below:
+              0: (R1, R0) = (0, 0) which means R1 disabled and R0 disabled.
+              1: (R1, R0) = (0, 1) which means R1 disabled and R0 enabled.
+              2: (R1, R0) = (1, 0) which means R1 enabled and R0 disabled.
+              3: (R1, R0) = (1, 1) which means R1 enabled and R0 enabled.
+            $ref: /schemas/types.yaml#/definitions/uint32
+            enum: [0, 1, 2, 3]
+
+          mediatek,tdsel:
+            description: |
+              An integer describing the steps for output level shifter duty
+              cycle when asserted (high pulse width adjustment). Valid arguments
+              are from 0 to 15.
+            $ref: /schemas/types.yaml#/definitions/uint32
+
+          mediatek,rdsel:
+            description: |
+              An integer describing the steps for input level shifter duty cycle
+              when asserted (high pulse width adjustment). Valid arguments are
+              from 0 to 63.
+            $ref: /schemas/types.yaml#/definitions/uint32
+
+        required:
+          - pinmux
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/pinctrl/mt8365-pinfunc.h>
+    soc {
+        #address-cells = <2>;
+        #size-cells = <2>;
+
+        pio: pinctrl@1000b000 {
+          compatible = "mediatek,mt8365-pinctrl";
+          reg = <0 0x1000b000 0 0x1000>;
+          mediatek,pctl-regmap = <&syscfg_pctl>;
+          pins-are-numbered;
+          gpio-controller;
+          #gpio-cells = <2>;
+          interrupt-controller;
+          #interrupt-cells = <2>;
+          interrupts = <GIC_SPI 115 IRQ_TYPE_LEVEL_HIGH>;

Blank line

+          pio-pins {
+            pins {
+              pinmux = <MT8365_PIN_59_SDA1__FUNC_SDA1_0>, <MT8365_PIN_60_SCL1__FUNC_SCL1_0>;
+              mediatek,pull-up-adv = <3>;
+              mediatek,drive-strength-adv = <00>;
+              bias-pull-up;
+            };
+          };
+        };
+    };

Best regards,
Krzysztof


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