linux-kernel - Re: [PATCH 6/6] dt-bindings: power: supply: qcom,smb2: add bindings for smb2 driver

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Date:   Sat, 2 Apr 2022 16:50:22 +0100
From:   Caleb Connolly <caleb.connolly@...aro.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Sebastian Reichel <sre@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org
Cc:     Amit Pundir <amit.pundir@...aro.org>,
        Sumit Semwal <sumit.semwal@...aro.org>
Subject: Re: [PATCH 6/6] dt-bindings: power: supply: qcom,smb2: add bindings
 for smb2 driver



On 02/04/2022 15:22, Krzysztof Kozlowski wrote:
> On 01/04/2022 22:26, Caleb Connolly wrote:
>> Add devicetree bindings for the Qualcomm PMI8998/PM660 SMB2 charger
>> drivers.
>>
>> Signed-off-by: Caleb Connolly <caleb.connolly@...aro.org>
>> ---
>>   .../bindings/power/supply/qcom,smb2.yaml      | 68 +++++++++++++++++++
>>   1 file changed, 68 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/power/supply/qcom,smb2.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/power/supply/qcom,smb2.yaml b/Documentation/devicetree/bindings/power/supply/qcom,smb2.yaml
>> new file mode 100644
>> index 000000000000..1bea1fef78b8
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/power/supply/qcom,smb2.yaml
>> @@ -0,0 +1,68 @@
>> +# SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/power/supply/qcom,smb2.yaml#
> 
> Hi,
Hi Krzysztof,
> 
> Are you sure "smb2" is a real Qualcomm versioning? IOW, is there going
> to be smb3 in the future? If not, better to just name the file according
> to model, so like compatible and like other existing schemas from Qualcomm.
Qualcomm versioning is a complete mystery to me 😅, downstream kernels have a 
"pmi8998_charger" which uses the qpnp-smb2 driver, there is also an "smb5" 
driver presumably for newer PMICs. This driver is used for the charger block 
found on the PMI8998 and PM660 at least, a name like "pmi8998_charger" might be 
more suitable.

> 
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Qualcomm PMI8998/PM660 Switch-Mode Battery Charger "2"
>> +
>> +maintainers:
>> +  - Caleb Connolly <caleb.connolly@...aro.org>
>> +
>> +properties:
>> +  compatible:
>> +    enum:
>> +      - qcom,pmi8998-smb2
>> +
>> +  reg:
>> +    maxItems: 1
>> +
>> +  interrupts:
>> +    items:
>> +      - description: usb plugin
> 
> Just maxItems:1 (description is obvious and matches names).
> 
>> +
>> +  interrupt-names:
>> +    items:
>> +      - const: usb-plugin
>> +
>> +  io-channels:
>> +    items:
>> +      - description: USB in current in uA
>> +      - description: USB in voltage in uV
>> +
>> +  io-channel-names:
>> +    items:
>> +      - const: usbin_i
>> +      - const: usbin_v
>> +
> 
> What about monitored-battery? How do you configure the battery
> characteristics?
> 
>> +required:
>> +  - compatible
>> +  - reg
>> +  - interrupts
>> +  - interrupt-names
>> +  - io-channels
>> +  - io-channel-names
>> +
>> +additionalProperties: false
>> +
>> +examples:
>> +  - |
>> +    #include <dt-bindings/interrupt-controller/irq.h>
>> +    pmic {
>> +      #address-cells = <1>;
>> +      #size-cells = <0>;
>> +      #interrupt-cells = <4>;
>> +
>> +      smb2@...0 {
> 
> Generic node name please, so "charger".
> 
> 
> 
> Best regards,
> Krzysztof

-- 
Kind Regards,
Caleb (they/them)