Re: [PATCH v1 1/2] dt-bindings: power: supply: Document Maxim MAX8971 charger

[Svyatoslav Ryhel]

нд, 23 лют. 2025 р. о 16:14 Krzysztof Kozlowski <krzk@xxxxxxxxxx> пише:
>
> On 23/02/2025 12:56, Svyatoslav Ryhel wrote:
> > нд, 23 лют. 2025 р. о 13:43 Krzysztof Kozlowski <krzk@xxxxxxxxxx> пише:
> >>
> >> On Fri, Feb 21, 2025 at 11:59:42AM +0200, Svyatoslav Ryhel wrote:
> >>> Add bindings for Maxim MAX8971 charger.
> >>>
> >>> Signed-off-by: Svyatoslav Ryhel <clamor95@xxxxxxxxx>
> >>> ---
> >>>  .../bindings/power/supply/maxim,max8971.yaml  | 133 ++++++++++++++++++
> >>>  1 file changed, 133 insertions(+)
> >>>  create mode 100644 Documentation/devicetree/bindings/power/supply/maxim,max8971.yaml
> >>>
> >>> diff --git a/Documentation/devicetree/bindings/power/supply/maxim,max8971.yaml b/Documentation/devicetree/bindings/power/supply/maxim,max8971.yaml
> >>> new file mode 100644
> >>> index 000000000000..26b37e6f662f
> >>> --- /dev/null
> >>> +++ b/Documentation/devicetree/bindings/power/supply/maxim,max8971.yaml
> >>> @@ -0,0 +1,133 @@
> >>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> >>> +%YAML 1.2
> >>> +---
> >>> +$id: http://devicetree.org/schemas/power/supply/maxim,max8971.yaml#
> >>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> >>> +
> >>> +title: Maxim MAX8971 IC charger
> >>> +
> >>> +maintainers:
> >>> +  - Svyatoslav Ryhel <clamor95@xxxxxxxxx>
> >>> +
> >>> +description:
> >>> +  The MAX8971 is a compact, high-frequency, high-efficiency switch-mode
> >>> +  charger for a one-cell lithium-ion (Li+) battery.
> >>> +
> >>> +properties:
> >>> +  compatible:
> >>> +    const: maxim,max8971
> >>> +
> >>> +  reg:
> >>> +    maxItems: 1
> >>> +
> >>> +  interrupts:
> >>> +    maxItems: 1
> >>> +
> >>> +  extcon:
> >>> +    description:
> >>> +      Special device used to detect type of plug.
> >>> +    $ref: /schemas/types.yaml#/definitions/phandle
> >>
> >> You rather miss proper connector or ports. Which device pins are
> >> describbed here?
> >>
> >
> > This is an optional phandle to extcon, which can detect plug type. If
>
> I know what is this, you just wrote. extcon property is not allowed anymore.
>

There is no helper for obtaining extcon via graph endpoint I am aware
of. Can you provide an example of graph parsing extcon helper?

> > extcon is provided, charger then can change its setup to better
> > provide supply to the battery. If no extcon is provided, device itself
> > can detect only the fact of charger without details about type.
>
>
> >
> >>
> >>> +
> >>> +  maxim,fcharge-current-limit-microamp:
> >>> +    description:
> >>> +      Fast-Charge current limit
> >>> +    minimum: 250000
> >>> +    default: 500000
> >>> +    maximum: 1550000
> >>> +
> >>> +  maxim,fcharge-timer-hours:
> >>> +    description: |
> >>> +      Fast-Charge timer in hours. Setting this value 3 and lower or 11 and
> >>> +      higher will disable Fast-Charge timer.
> >>> +    $ref: /schemas/types.yaml#/definitions/uint32
> >>> +    default: 5
> >>> +
> >>> +  maxim,fcharge-rst-threshold-high:
> >>> +    description:
> >>> +      Set Fast-Charge reset threshold to -100 mV
> >>> +    type: boolean
> >>> +
> >>> +  maxim,in-current-limit-microamp:
> >>> +    description:
> >>> +      Input current limit
> >>> +    minimum: 100000
> >>> +    default: 500000
> >>> +    maximum: 1500000
> >>> +
> >>> +  maxim,topoff-timer-minutes:
> >>> +    description:
> >>> +      Top-Off timer minutes
> >>> +    $ref: /schemas/types.yaml#/definitions/uint32
> >>> +    enum: [0, 10, 20, 30, 40, 50, 60, 70]
> >>> +    default: 30
> >>> +
> >>> +  maxim,topoff-current-threshold-microamp:
> >>> +    description:
> >>> +      Top-Off current threshold
> >>> +    enum: [50000, 100000, 150000, 200000]
> >>> +    default: 50000
> >>> +
> >>> +  maxim,fcharge-usb-current-limit-microamp:
> >>> +    description:
> >>> +      Fast-Charge USB current limit
> >>> +    minimum: 100000
> >>> +    default: 500000
> >>> +    maximum: 1500000
> >>> +
> >>> +  maxim,fcharge-ac-current-limit-microamp:
> >>> +    description:
> >>> +      Fast-Charge AC current limit
> >>> +    minimum: 100000
> >>> +    default: 500000
> >>> +    maximum: 1500000
> >>> +
> >>> +  maxim,usb-in-current-limit-microamp:
> >>> +    description:
> >>> +      USB Input current limit
> >>> +    minimum: 100000
> >>> +    default: 500000
> >>> +    maximum: 1500000
> >>> +
> >>> +  maxim,ac-in-current-limit-microamp:
> >>> +    description:
> >>> +      AC Input current limit
> >>> +    minimum: 100000
> >>> +    default: 500000
> >>> +    maximum: 1500000
> >>
> >> For all or most of these you miss monitored batter.
> >>
> >
> > This is a charger, it does not monitor battery. There is a fuel gauge
> > for that or a battery monitor.
> >
> What does charger charge? Battery or something else?
>

Anything it is linked to. Moreover ref to power supply is not needed
since properties from there are not relevant to this driver.
monitored-battery refers to a simple battery cell, which has nothing
to do with charger and power-supplies is irrelevant since this device
is on its own a power-supplies for battery/fuel gauge.

> Best regards,
> Krzysztof