linux-kernel - Re: [PATCH 1/7] dt-bindings: soc: qcom: Add qcom-pbs bindings

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Message-ID: <2e871e21-a81d-0d7d-993b-9a9d7bd9d962@quicinc.com>
Date:   Wed, 28 Jun 2023 18:19:27 -0700
From:   Anjelique Melendez <quic_amelende@...cinc.com>
To:     Rob Herring <robh@...nel.org>
CC:     <pavel@....cz>, <lee@...nel.org>, <thierry.reding@...il.com>,
        <krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
        <agross@...nel.org>, <andersson@...nel.org>,
        <konrad.dybcio@...aro.org>, <u.kleine-koenig@...gutronix.de>,
        <linux-leds@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        <linux-pwm@...r.kernel.org>
Subject: Re: [PATCH 1/7] dt-bindings: soc: qcom: Add qcom-pbs bindings



On 6/26/2023 6:58 AM, Rob Herring wrote:
> On Wed, Jun 21, 2023 at 11:59:45AM -0700, Anjelique Melendez wrote:
>> Add binding for the Qualcomm Programmable Boot Sequencer device.
>>
>> Signed-off-by: Anjelique Melendez <quic_amelende@...cinc.com>
>> ---
>>  .../bindings/soc/qcom/qcom-pbs.yaml           | 41 +++++++++++++++++++
>>  1 file changed, 41 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/soc/qcom/qcom-pbs.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/soc/qcom/qcom-pbs.yaml b/Documentation/devicetree/bindings/soc/qcom/qcom-pbs.yaml
>> new file mode 100644
>> index 000000000000..0a89c334f95c
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/soc/qcom/qcom-pbs.yaml
>> @@ -0,0 +1,41 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/soc/qcom/qcom-pbs.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Qualcomm Technologies, Inc. PBS
>> +
>> +maintainers:
>> +  - Anjelique Melendez <quic_amelende@...cinc.com>
>> +
>> +description: |
>> +  Qualcomm PBS (programmable boot sequencer) supports triggering sequences
>> +  for clients upon request.
>> +
>> +properties:
>> +  compatible:
>> +    const: qcom,pbs
>> +
>> +  reg:
>> +    description: |
>> +      Base address of the PBS peripheral.
>> +    maxItems: 1
>> +
>> +required:
>> + - compatible
>> + - reg
>> +
>> +additionalProperties: false
>> +
>> +examples:
>> +  - |
>> +    pmic {
>> +      #address-cells = <1>;
>> +      #size-cells = <0>;
>> +
>> +      qcom,pbs@...0 {
>> +        compatible = "qcom,pbs";
>> +        reg = <0x7400>;
>> +      };
> 
> Why do you need a child node for this? Is there more than 1 instance in 
> a PMIC? Every sub-function of a PMIC doesn't have to have a DT node.
>

We currently have another downstream driver (which is planned to get upstreamed)
which also needs a handle to a pbs device in order to properly trigger events. 

> Rob