Re: [PATCH v10 1/2] dt-bindings: mfd: Add MAX5970 and MAX5978

[Naresh Solanki]

Hi Krzysztof,

On 15-11-2022 07:34 pm, Krzysztof Kozlowski wrote:
> On 15/11/2022 12:09, Naresh Solanki wrote:
> > From: Marcello Sylvester Bauer <sylv@xxxxxxx>
> >
> > The MAX597x is a hot swap controller with configurable fault protection.
> > It also has 10bit ADC for current & voltage measurements.
> >
> > Signed-off-by: Marcello Sylvester Bauer <sylv@xxxxxxx>
> > Co-developed-by: Patrick Rudolph <patrick.rudolph@xxxxxxxxxxxxx>
> > Signed-off-by: Patrick Rudolph <patrick.rudolph@xxxxxxxxxxxxx>
> > Co-developed-by: Naresh Solanki <Naresh.Solanki@xxxxxxxxxxxxx>
> > Signed-off-by: Naresh Solanki <Naresh.Solanki@xxxxxxxxxxxxx>
> > ---
> >   .../bindings/mfd/maxim,max5970.yaml           | 154 ++++++++++++++++++
> >   1 file changed, 154 insertions(+)
> >   create mode 100644 Documentation/devicetree/bindings/mfd/maxim,max5970.yaml
> >
> > diff --git a/Documentation/devicetree/bindings/mfd/maxim,max5970.yaml b/Documentation/devicetree/bindings/mfd/maxim,max5970.yaml
> > new file mode 100644
> > index 000000000000..edf0c23db4ca
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/mfd/maxim,max5970.yaml
> > @@ -0,0 +1,154 @@
> > +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/mfd/maxim,max5970.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Regulator for MAX5970 smart switch from Maxim Integrated.
> > +
> > +maintainers:
> > +  - Patrick Rudolph <patrick.rudolph@xxxxxxxxxxxxx>
> > +
> > +description: |
> > +  The smart switch provides no output regulation, but independent fault protection
> > +  and voltage and current sensing.
> > +  Programming is done through I2C bus.
> > +
> > +  Datasheets:
> > +    https://datasheets.maximintegrated.com/en/ds/MAX5970.pdf
> > +    https://datasheets.maximintegrated.com/en/ds/MAX5978.pdf
> > +
> > +properties:
> > +  compatible:
> > +    enum:
> > +      - maxim,max5970
> > +      - maxim,max5978
> > +
> > +  reg:
> > +    maxItems: 1
> > +
> > +  interrupts:
> > +    maxItems: 1
> > +
> > +  leds:
> > +    type: object
> > +    description:
> > +      Properties for four LEDS.
> > +
> > +    properties:
> > +      "#address-cells":
> > +        const: 1
> > +
> > +      "#size-cells":
> > +        const: 0
> > +
> > +    patternProperties:
> > +      "^led@[0-3]$":
> > +        $ref: /schemas/leds/common.yaml#
> > +        type: object
> > +
> > +    additionalProperties: false
> > +
> > +  vss1-supply:
> > +    description: Supply of the first channel.
> > +
> > +  vss2-supply:
> > +    description: Supply of the second channel.
> > +
> > +  regulators:
> > +    type: object
> > +    description:
> > +      Properties for both regulators. Also set value for shunt resistor used.
>
> You should explain not the syntax,  but what part of hardware this nodes
> represents. Therefore "Also set value" does not fit at all. Hardware
> sets value?
You mean something like: Properties for power switch
> I looked at datasheets to figure it out but they do not refer to any
> configurable regulator, LDO nor "sw0/sw1/sw2". Therefore I have no clue
> what to expect here...
Yes this is for power switch part of max5970/8
> > +
> > +    patternProperties:
> > +      "^sw[0-1]$":
> > +        $ref: /schemas/regulator/regulator.yaml#
> > +        type: object
> > +        properties:
> > +          shunt-resistor-micro-ohms:
> > +            description: |
> > +              The value of current sense resistor in microohms.
> > +
> > +        required:
> > +          - shunt-resistor-micro-ohms
> > +
> > +      unevaluatedProperties: false
>
> I don't think it has proper indentation. Did you test the binding?
Definitely tested the bindings before I push the patch.
> > +
> > +    additionalProperties: false
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +  - regulators
> > +  - vss1-supply
> > +
> > +allOf:
> > +  - if:
> > +      properties:
> > +        compatible:
> > +          enum:
> > +            - maxim,max5970
> > +    then:
> > +      required:
> > +        - vss2-supply
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > +  - |
> > +    i2c {
> > +        #address-cells = <1>;
> > +        #size-cells = <0>;
> > +        regulator@3a {
> > +            compatible = "maxim,max5978";
> > +            reg = <0x3a>;
> > +            vss1-supply = <&p3v3>;
> > +
> > +            regulators {
> > +                sw0_ref_0: sw0 {
> > +                    regulator-compatible = "SW0";
> > +                    shunt-resistor-micro-ohms = <12000>;
> > +                };
> > +            };
> > +
> > +            leds {
> > +                #address-cells = <1>;
> > +                #size-cells = <0>;
> > +                led@0 {
> > +                    reg = <0>;
> > +                    label = "led0";
> > +                    default-state = "on";
> > +                };
> > +                led@1 {
> > +                    reg = <1>;
> > +                    label = "led1";
> > +                    default-state = "on";
> > +                };
> > +            };
> > +        };
> > +    };
> > +
> > +  - |
> > +    i2c {
> > +        #address-cells = <1>;
> > +        #size-cells = <0>;
> > +
> > +        regulator@3a {
> > +            compatible = "maxim,max5970";
> > +            reg = <0x3a>;
> > +            vss1-supply = <&p3v3>;
> > +            vss2-supply = <&p5v>;
> > +
> > +            regulators {
> > +                sw0_ref_1: sw0 {
> > +                    regulator-compatible = "SW0";
>
> This property is deprecated, isn't it? Again - did you test this?
Yes tested.
> Best regards,
> Krzysztof

Regards,
Naresh