linux-kernel - Re: [PATCH v2 3/4] dt-bindings: mfd: Add Delta TN48M CPLD drivers bindings

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Date:   Mon, 24 May 2021 18:09:40 -0500
From:   Rob Herring <robh@...nel.org>
To:     Robert Marko <robert.marko@...tura.hr>
Cc:     linus.walleij@...aro.org, bgolaszewski@...libre.com,
        lee.jones@...aro.org, linux-gpio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        luka.perkov@...tura.hr, jmp@...phyte.org, pmenzel@...gen.mpg.de,
        buczek@...gen.mpg.de
Subject: Re: [PATCH v2 3/4] dt-bindings: mfd: Add Delta TN48M CPLD drivers
 bindings

On Mon, May 24, 2021 at 02:05:38PM +0200, Robert Marko wrote:
> Add binding documents for the Delta TN48M CPLD drivers.
> 
> Signed-off-by: Robert Marko <robert.marko@...tura.hr>
> ---
> Changes in v2:
> * Implement MFD as a simple I2C MFD
> * Add GPIO bindings as separate

I don't understand why this changed. This doesn't look like an MFD to 
me. Make your binding complete if there are missing functions. 
Otherwise, stick with what I already ok'ed.

> 
>  .../bindings/gpio/delta,tn48m-gpio.yaml       | 42 ++++++++++
>  .../bindings/mfd/delta,tn48m-cpld.yaml        | 81 +++++++++++++++++++
>  2 files changed, 123 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/gpio/delta,tn48m-gpio.yaml
>  create mode 100644 Documentation/devicetree/bindings/mfd/delta,tn48m-cpld.yaml
> 
> diff --git a/Documentation/devicetree/bindings/gpio/delta,tn48m-gpio.yaml b/Documentation/devicetree/bindings/gpio/delta,tn48m-gpio.yaml
> new file mode 100644
> index 000000000000..aca646aecb12
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/gpio/delta,tn48m-gpio.yaml
> @@ -0,0 +1,42 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/gpio/delta,tn48m-gpio.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Delta Networks TN48M CPLD GPIO controller
> +
> +maintainers:
> +  - Robert Marko <robert.marko@...tura.hr>
> +
> +description: |
> +  This module is part of the Delta TN48M multi-function device. For more
> +  details see ../mfd/delta,tn48m-cpld.yaml.
> +
> +  GPIO controller module provides GPIO-s for the SFP slots.
> +  It is split into 3 controllers, one output only for the SFP TX disable
> +  pins, one input only for the SFP present pins and one input only for
> +  the SFP LOS pins.
> +
> +properties:
> +  compatible:
> +    enum:
> +      - delta,tn48m-gpio-sfp-tx-disable
> +      - delta,tn48m-gpio-sfp-present
> +      - delta,tn48m-gpio-sfp-los

The function of the 'general purpose' IO should not be encoded into the 
compatible name. Is each instance.

> +
> +  reg:
> +    maxItems: 1
> +
> +  "#gpio-cells":
> +    const: 2
> +
> +  gpio-controller: true
> +
> +required:
> +  - compatible
> +  - reg
> +  - "#gpio-cells"
> +  - gpio-controller
> +
> +additionalProperties: false
> diff --git a/Documentation/devicetree/bindings/mfd/delta,tn48m-cpld.yaml b/Documentation/devicetree/bindings/mfd/delta,tn48m-cpld.yaml
> new file mode 100644
> index 000000000000..055e09129f86
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mfd/delta,tn48m-cpld.yaml
> @@ -0,0 +1,81 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/mfd/delta,tn48m-cpld.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Delta Networks TN48M CPLD controller
> +
> +maintainers:
> +  - Robert Marko <robert.marko@...tura.hr>
> +
> +description: |
> +  Lattice CPLD onboard the TN48M switches is used for system
> +  management.
> +
> +  It provides information about the hardware model, revision,
> +  PSU status etc.
> +
> +  It is also being used as a GPIO expander for the SFP slots.
> +
> +properties:
> +  compatible:
> +    const: delta,tn48m-cpld
> +
> +  reg:
> +    description:
> +      I2C device address.
> +    maxItems: 1
> +
> +  "#address-cells":
> +    const: 1
> +
> +  "#size-cells":
> +    const: 0
> +
> +required:
> +  - compatible
> +  - reg
> +  - "#address-cells"
> +  - "#size-cells"
> +
> +patternProperties:
> +  "^gpio(@[0-9a-f]+)?$":
> +    $ref: ../gpio/delta,tn48m-gpio.yaml
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    i2c {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        cpld@41 {
> +            compatible = "delta,tn48m-cpld";
> +            reg = <0x41>;
> +            #address-cells = <1>;
> +            #size-cells = <0>;
> +
> +            gpio@31 {
> +                compatible = "delta,tn48m-gpio-sfp-tx-disable";
> +                reg = <0x31>;

Encode the register address into the gpio cells.

> +                gpio-controller;
> +                #gpio-cells = <2>;
> +            };
> +
> +            gpio@3a {
> +                compatible = "delta,tn48m-gpio-sfp-present";
> +                reg = <0x3a>;
> +                gpio-controller;
> +                #gpio-cells = <2>;
> +            };
> +
> +            gpio@40 {
> +                compatible = "delta,tn48m-gpio-sfp-los";
> +                reg = <0x40>;
> +                gpio-controller;
> +                #gpio-cells = <2>;
> +            };
> +        };
> +    };
> -- 
> 2.31.1
>