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

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Message-ID: <2b0500e7-70e2-4bfe-ae72-ebab0f060eeb@kernel.org>
Date: Sun, 23 Feb 2025 15:14:41 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Svyatoslav Ryhel <clamor95@...il.com>
Cc: Sebastian Reichel <sre@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/2] dt-bindings: power: supply: Document Maxim MAX8971
 charger

On 23/02/2025 12:56, Svyatoslav Ryhel wrote:
> нд, 23 лют. 2025 р. о 13:43 Krzysztof Kozlowski <krzk@...nel.org> 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@...il.com>
>>> ---
>>>  .../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@...il.com>
>>> +
>>> +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.

> 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?

Best regards,
Krzysztof