linux-kernel - Re: [PATCH 1/4] dt-bindings: power: supply: Add pm8916 VM-BMS

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Date:   Sat, 29 Jul 2023 17:06:14 +0500
From:   Nikita Travkin <nikita@...n.ru>
To:     Conor Dooley <conor@...nel.org>
Cc:     Sebastian Reichel <sre@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH 1/4] dt-bindings: power: supply: Add pm8916 VM-BMS

Conor Dooley писал(а) 29.07.2023 15:03:
> On Fri, Jul 28, 2023 at 10:19:30PM +0500, Nikita Travkin wrote:
>> Qualcomm Voltage Mode BMS is a battery monitoring block in PM8916 PMIC.
>> Document it's DT binding.
>>
>> Signed-off-by: Nikita Travkin <nikita@...n.ru>
>> ---
>>  .../bindings/power/supply/qcom,pm8916-bms-vm.yaml  | 64 ++++++++++++++++++++++
>>  1 file changed, 64 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/power/supply/qcom,pm8916-bms-vm.yaml b/Documentation/devicetree/bindings/power/supply/qcom,pm8916-bms-vm.yaml
>> new file mode 100644
>> index 000000000000..455973d46862
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/power/supply/qcom,pm8916-bms-vm.yaml
>> @@ -0,0 +1,64 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/power/supply/qcom,pm8916-bms-vm.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Qualcomm Voltage Mode BMS
>> +
>> +maintainers:
>> +  - Nikita Travkin <nikita@...n.ru>
>> +
>> +description:
>> +  Voltage Mode BMS is a hardware block found in some Qualcomm PMICs
>> +  such as pm8916. This block performs battery voltage monitoring.
>> +
>> +allOf:
>> +  - $ref: power-supply.yaml#
>> +
>> +properties:
>> +  compatible:
>> +    const: qcom,pm8916-bms-vm
>> +
>> +  reg:
>> +    maxItems: 1
>> +
>> +  interrupts:
>> +    items:
>> +      - description: FIFO update done
> 
> You don't need items: here since you only have one - const: will do.
> 

Ack.

>> +  interrupt-names:
>> +    items:
>> +      - const: fifo
> 
> Same here, but do you really need a name, when you have only one
> interrupt?
> 

Hm, thinking of this more, the hardware actually has more than one
interrupt, even though this one seems to be the only really useful
one. Would a better way forward be to list all of them (and fix
the driver to get the value by it's name) or it would be
acceptable to leave the names here and extend the list at a later
date when (if ever) other interrupts are needed?

Thanks for the review!
Nikita

> Thanks,
> Conor.
> 
>> +
>> +  monitored-battery: true
>> +
>> +  power-supplies: true
>> +
>> +
>> +required:
>> +  - compatible
>> +  - reg
>> +  - interrupts
>> +  - interrupt-names
>> +  - monitored-battery
>> +
>> +additionalProperties: false
>> +
>> +examples:
>> +  - |
>> +    #include <dt-bindings/interrupt-controller/irq.h>
>> +    pmic {
>> +      #address-cells = <1>;
>> +      #size-cells = <0>;
>> +
>> +      battery@...0 {
>> +        compatible = "qcom,pm8916-bms-vm";
>> +        reg = <0x4000>;
>> +        interrupts = <0x0 0x40 4 IRQ_TYPE_EDGE_RISING>;
>> +        interrupt-names = "fifo";
>> +
>> +        monitored-battery = <&battery>;
>> +        power-supplies = <&pm8916_charger>;
>> +      };
>> +    };
>>
>> --
>> 2.41.0
>>