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

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Message-ID: <e63a3e34-1f73-3661-8655-e34e1e955804@linaro.org>
Date:   Tue, 9 May 2023 09:08:15 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Manikanta Mylavarapu <quic_mmanikan@...cinc.com>,
        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 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.

>>> +
>>> +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?


>>> +    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