[PATCH 24/32] dt-bindings: Document kendryte,k210-fpioa bindings

[Sean Anderson]

On 11/9/20 10:36 AM, Rob Herring wrote:
> On Sat, Nov 07, 2020 at 05:14:12PM +0900, Damien Le Moal wrote:
>> Document the device tree bindings for the Kendryte K210 SoC Fully
>> Programmable IO Array (FPIOA) pinctrl driver in
>> Documentation/devicetree/bindings/pinctrl/kendryte,k210-fpioa.yaml
>>
>> Signed-off-by: Damien Le Moal <damien.lemoal at wdc.com>
>> ---
>>  .../bindings/pinctrl/kendryte,k210-fpioa.yaml | 106 ++++++++++++++++++
>>  1 file changed, 106 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/pinctrl/kendryte,k210-fpioa.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/pinctrl/kendryte,k210-fpioa.yaml b/Documentation/devicetree/bindings/pinctrl/kendryte,k210-fpioa.yaml
>> new file mode 100644
>> index 000000000000..8730add88ee0
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/pinctrl/kendryte,k210-fpioa.yaml
>> @@ -0,0 +1,106 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/pinctrl/kendryte,k210-fpioa.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Kendryte K210 FPIOA (Fully Programmable IO Array) Device Tree Bindings
>> +
>> +maintainers:
>> +  - Damien Le Moal <damien.lemoal at wdc.com>
>> +
>> +description:
>> +  The Kendryte K210 SoC Fully Programmable IO Array controller allows assiging
>> +  any of 256 possible functions to any of 48 IO pins. Pin function configuration
>> +  is performed on a per-pin basis.
>> +
>> +properties:
>> +  compatible:
>> +    const: kendryte,k210-fpioa
>> +
>> +  reg:
>> +    description: FPIOA controller register space base address and size
>> +
>> +  clocks:
>> +    minItems: 2
>> +    maxItems: 2
> 
> Can drop these. Implied by 'items' length.
> 
>> +    items:
>> +      - description: Controller reference clock source
>> +      - description: APB interface clock source
>> +
>> +  clock-names:
>> +    minItems: 2
>> +    maxItems: 2
>> +    items:
>> +      - const: ref
>> +      - const: pclk
>> +
>> +  resets:
>> +    maxItems: 1
>> +
>> +  kendryte,sysctl:
>> +    minItems: 1
>> +    maxItems: 1
>> +    $ref: /schemas/types.yaml#/definitions/phandle-array
>> +    description: |
>> +      phandle to the system controller node
>> +
>> +  kendryte,power-offset:
>> +    minItems: 1
>> +    maxItems: 1
>> +    $ref: /schemas/types.yaml#/definitions/uint32
>> +    description: |
>> +      Offset of the power domain control register of the system controller.
> 
> Sounds like you should be using power-domains binding.

This is for pin power domains. E.g. pins 0-5 can be set to 1V8 or 3V3 logic levels.

--Sean

> 
>> +      The value should be the macro K210_SYSCTL_POWER_SEL defined in
>> +      dt-bindings/mfd/k210-sysctl.h.
>> +
>> +patternProperties:
>> +  '^.*$':
>> +    if:
>> +      type: object
>> +    then:
> 
> This is a hack for existing bindings. Use '-pins$' for the node names.
> 
>> +      patternProperties:
>> +        "^pinmux$":
> 
> Not really a pattern.
> 
>> +          $ref: /schemas/pinctrl/pincfg-node.yaml
> 
> This is at the wrong level. Goes up 1 level.
> 
>> +          description:
>> +            An array of IO pins alternate functions. The values for each
>> +            IO pin is a combination of an IO pin number (0 to 47) with the
>> +            desired function for the IO pin. Functions are defined as macros in
>> +            dt-bindings/pinctrl/k210-pinctrl.h. The K210_FPIOA(IO pin, function)
>> +            is provided to facilitate the combination of IO pin numbers and
>> +            functions.
>> +
>> +required:
>> +  - compatible
>> +  - reg
>> +  - clocks
>> +  - resets
>> +  - kendryte,sysctl
>> +  - kendryte,power-offset
>> +
>> +additionalProperties: false
>> +
>> +examples:
>> +  - |
>> +    #include <dt-bindings/pinctrl/k210-pinctrl.h>
>> +    #include <dt-bindings/mfd/k210-sysctl.h>
>> +    #include <dt-bindings/clock/k210-sysctl.h>
>> +    #include <dt-bindings/reset/k210-sysctl.h>
>> +
>> +    fpioa: pinmux at 502B0000 {
>> +      compatible = "kendryte,k210-fpioa";
>> +      reg = <0x502B0000 0x100>;
>> +      clocks = <&sysclk K210_CLK_FPIOA>;
>> +      resets = <&sysrst K210_RST_FPIOA>;
>> +      kendryte,sysctl = <&sysctl>;
>> +      kendryte,power-offset = <K210_SYSCTL_POWER_SEL>;
>> +      pinctrl-0 = <&fpioa_jtag>;
>> +      pinctrl-names = "default";
>> +
>> +      fpioa_jtag: jtag {
>> +        pinmux = <K210_FPIOA(0, K210_PCF_JTAG_TCLK)>,
>> +                 <K210_FPIOA(1, K210_PCF_JTAG_TDI)>,
>> +                 <K210_FPIOA(2, K210_PCF_JTAG_TMS)>,
>> +                 <K210_FPIOA(3, K210_PCF_JTAG_TDO)>;
>> +      };
>> +    };
>> -- 
>> 2.28.0
>>