linux-kernel - Re: [PATCH 01/11] dt-bindings: remoteproc: qcom: Add support for multipd model

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Date:   Tue, 9 May 2023 16:04:48 +0530
From:   Manikanta Mylavarapu <quic_mmanikan@...cinc.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        <agross@...nel.org>, <andersson@...nel.org>,
        <konrad.dybcio@...aro.org>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <jassisinghbrar@...il.com>,
        <mathieu.poirier@...aro.org>, <mturquette@...libre.com>,
        <sboyd@...nel.org>, <quic_gurus@...cinc.com>,
        <loic.poulain@...aro.org>, <quic_eberman@...cinc.com>,
        <robimarko@...il.com>, <linux-arm-msm@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-remoteproc@...r.kernel.org>, <linux-clk@...r.kernel.org>
CC:     <quic_srichara@...cinc.com>, <quic_gokulsri@...cinc.com>,
        <quic_sjaganat@...cinc.com>, <quic_kathirav@...cinc.com>,
        <quic_arajkuma@...cinc.com>, <quic_anusha@...cinc.com>,
        <quic_poovendh@...cinc.com>
Subject: Re: [PATCH 01/11] dt-bindings: remoteproc: qcom: Add support for
 multipd model



On 5/9/2023 12:38 PM, Krzysztof Kozlowski wrote:
> On 08/05/2023 15:45, Manikanta Mylavarapu wrote:
>>
>>
>> On 3/7/2023 8:47 PM, Krzysztof Kozlowski wrote:
>>> On 07/03/2023 05:41, Manikanta Mylavarapu wrote:
>>>> Add new binding document for multipd model remoteproc.
>>>> IPQ5018, IPQ9574 follows multipd model.
>>>>
>>>> Signed-off-by: Manikanta Mylavarapu <quic_mmanikan@...cinc.com>
>>>> ---
>>>>    .../bindings/remoteproc/qcom,multipd-pil.yaml | 282 ++++++++++++++++++
>>>>    1 file changed, 282 insertions(+)
>>>>    create mode 100644 Documentation/devicetree/bindings/remoteproc/qcom,multipd-pil.yaml
>>>>
>>>> diff --git a/Documentation/devicetree/bindings/remoteproc/qcom,multipd-pil.yaml b/Documentation/devicetree/bindings/remoteproc/qcom,multipd-pil.yaml
>>>> new file mode 100644
>>>> index 000000000000..b788607f5abd
>>>> --- /dev/null
>>>> +++ b/Documentation/devicetree/bindings/remoteproc/qcom,multipd-pil.yaml
>>>> @@ -0,0 +1,282 @@
>>>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>>>> +%YAML 1.2
>>>> +---
>>>> +$id: http://devicetree.org/schemas/remoteproc/qcom,multipd-pil.yaml#
>>>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>>>> +
>>>> +title: Qualcomm Multipd Secure Peripheral Image Loader
>>>> +
>>>> +maintainers:
>>>> +  - Bjorn Andersson <andersson@...nel.org>
>>>> +  - Mathieu Poirier <mathieu.poirier@...aro.org>
>>>> +
>>>> +description:
>>>> +  Multipd Peripheral Image Loader loads firmware and boots Q6 pd, WCSS pd
>>>> +  remoteproc's on the Qualcomm IPQ5018, IPQ9574 SoC.
>>>
>>> What is a "pd"?
>>>
>> Pd means protection domain.
>> It's similar to process in Linux. Here QDSP6 processor runs each wifi
>> radio functionality on a separate process. One process can't access
>> other process resources, so this is termed as PD i.e protection domain.
>> Here we have two pd's called root and user pd. We can correlate Root pd
>> as root and user pd as user in linux. Root pd has more privileges than
>> user pd.
>>   From remoteproc driver perspective, root pd corresponds to QDSP6
>> processor bring up and user pd corresponds to Wifi radio (WCSS) bring up.
> 
> Parts of it should be in description. And definitely "pd" should be
> explained.
> 
Sure, i will add it in cover page.
>>>> +
>>>> +properties:
>>>> +  compatible:
>>>> +    enum:
>>>> +      - qcom,ipq5018-q6-mpd
>>>> +      - qcom,ipq9574-q6-mpd
>>>> +
>>>> +  '#address-cells': true
>>>> +
>>>> +  '#size-cells': true
> 
> ...
> 
>>>
>> Sure, will add.
>>>> +    description:
>>>> +      Qualcomm G-Link subnode which represents communication edge, channels
>>>> +      and devices related to the Modem.
>>>> +
>>>> +patternProperties:
>>>> +  "^remoteproc_pd1|remoteproc_pd2|remoteproc_pd3":
>>>
>>> No, underscores are not allowed. Also, what is pd?
>>>
>> Sure, will remove underscores.
> 
> Shouldn't this be just pd-1?
> 
> 
I think 'pd-1' not enough. Because child's i.e userpd's also considered
as remote processor's, so name should be like "remoteproc-pd1".
>>>> +    type: object
>>>> +    description:
>>>> +      In Multipd model, WCSS pd depends on Q6 pd i.e Q6 pd should be up before
>>>> +      WCSS. It can be achieved by keeping wcss pd node as subnode of Q6
>>>> +      device node.
>>>> +
>>>> +    properties:
>>>> +      compatible:
>>>> +        enum:
>>>> +          - "qcom,ipq5018-wcss-ahb-mpd"
>>>> +          - "qcom,ipq9574-wcss-ahb-mpd"
>>>> +          - "qcom,ipq5018-wcss-pcie-mpd"
> 
> 
> 
> Best regards,
> Krzysztof
> 

Thanks & Regards,
Manikanta.