linux-kernel - Re: [PATCH v3 5/6] dt-bindings: mfd: Add Delta TN48M CPLD drivers bindings

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Date:   Wed, 2 Jun 2021 11:47:19 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     Robert Marko <robert.marko@...tura.hr>
Cc:     linux-kernel@...r.kernel.org, linus.walleij@...aro.org,
        bgolaszewski@...libre.com, linux-gpio@...r.kernel.org,
        p.zabel@...gutronix.de, robh+dt@...nel.org,
        devicetree@...r.kernel.org, luka.perkov@...tura.hr,
        jmp@...phyte.org, pmenzel@...gen.mpg.de, buczek@...gen.mpg.de
Subject: Re: [PATCH v3 5/6] dt-bindings: mfd: Add Delta TN48M CPLD drivers
 bindings

On Mon, 31 May 2021, Robert Marko wrote:

> Add binding documents for the Delta TN48M CPLD drivers.
> 
> Signed-off-by: Robert Marko <robert.marko@...tura.hr>
> ---
> Changes in v3:
> * Include bindings for reset driver
> 
> Changes in v2:
> * Implement MFD as a simple I2C MFD
> * Add GPIO bindings as separate
> 
>  .../bindings/gpio/delta,tn48m-gpio.yaml       | 42 +++++++++
>  .../bindings/mfd/delta,tn48m-cpld.yaml        | 90 +++++++++++++++++++
>  .../bindings/reset/delta,tn48m-reset.yaml     | 35 ++++++++
>  3 files changed, 167 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/gpio/delta,tn48m-gpio.yaml
>  create mode 100644 Documentation/devicetree/bindings/mfd/delta,tn48m-cpld.yaml
>  create mode 100644 Documentation/devicetree/bindings/reset/delta,tn48m-reset.yaml

> +++ b/Documentation/devicetree/bindings/mfd/delta,tn48m-cpld.yaml
> @@ -0,0 +1,90 @@
> +# 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 and
> +  reset controller for the switch MAC-s and other peripherals.
> +
> +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]+)?$":
> +    $ref: ../gpio/delta,tn48m-gpio.yaml
> +
> +  "^reset-controller?$":
> +    $ref: ../reset/delta,tn48m-reset.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>;
> +                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>;
> +            };
> +
> +            reset-controller {
> +              compatible = "delta,tn48m-reset";
> +              #reset-cells = <1>;
> +            };

How is the Reset component addressed?

> +        };
> +    };

-- 
Lee Jones [李琼斯]
Senior Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
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