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Message-ID: <4669eed6-b76c-8e68-74b1-36ea52a4bd5b@quicinc.com>
Date:   Thu, 18 May 2023 22:52:54 +0530
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Subject: Re: [PATCH 01/11] dt-bindings: remoteproc: qcom: Add support for
 multipd model
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From:   Manikanta Mylavarapu <quic_mmanikan@quicinc.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>,
        <agross@kernel.org>, <andersson@kernel.org>,
        <konrad.dybcio@linaro.org>, <robh+dt@kernel.org>,
        <krzysztof.kozlowski+dt@linaro.org>, <jassisinghbrar@gmail.com>,
        <mathieu.poirier@linaro.org>, <mturquette@baylibre.com>,
        <sboyd@kernel.org>, <quic_gurus@quicinc.com>,
        <loic.poulain@linaro.org>, <quic_eberman@quicinc.com>,
        <robimarko@gmail.com>, <linux-arm-msm@vger.kernel.org>,
        <devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <linux-remoteproc@vger.kernel.org>, <linux-clk@vger.kernel.org>
CC:     <quic_srichara@quicinc.com>, <quic_gokulsri@quicinc.com>,
        <quic_sjaganat@quicinc.com>, <quic_kathirav@quicinc.com>,
        <quic_arajkuma@quicinc.com>, <quic_anusha@quicinc.com>,
        <quic_poovendh@quicinc.com>
References: <1678164097-13247-1-git-send-email-quic_mmanikan@quicinc.com>
 <1678164097-13247-2-git-send-email-quic_mmanikan@quicinc.com>
 <38a5a268-7d8a-6e61-4272-8e9155df0034@linaro.org>
 <790496d7-98dc-c92e-dedc-1c89395a1ad8@quicinc.com>
In-Reply-To: <790496d7-98dc-c92e-dedc-1c89395a1ad8@quicinc.com>
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On 5/8/2023 7:15 PM, 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@quicinc.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@kernel.org>
>>> +  - Mathieu Poirier <mathieu.poirier@linaro.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.
>>> +
>>> +properties:
>>> +  compatible:
>>> +    enum:
>>> +      - qcom,ipq5018-q6-mpd
>>> +      - qcom,ipq9574-q6-mpd
>>> +
>>> +  '#address-cells': true
>>> +
>>> +  '#size-cells': true
>>
>> Why do you need both?
>>
>> If really needed, these should be const. >
> It's not required. I am going to remove it.
>>> +
>>> +  'ranges': true
>>> +
>>
>> Same question - why do you need it?
>>
> It's not required. I am going to remove it.
>>> +  reg:
>>> +    maxItems: 1
>>> +
>>> +  interrupts-extended:
>>
>> Instead interrupts
>>
> Sure. I will use 'interrupts'.
> 
Please discard my previous reply. Here i couldn't able to use 
'interrupts' because i am using interrupts from two different interrupt 
controllers. Sorry for previous wrong reply.
>>> +    items:
>>> +      - description: Watchdog interrupt
>>> +      - description: Fatal interrupt
>>> +      - description: Ready interrupt
>>> +      - description: Handover interrupt
>>> +      - description: Stop acknowledge interrupt
>>> +
>>> +  interrupt-names:
>>> +    items:
>>> +      - const: wdog
>>> +      - const: fatal
>>> +      - const: ready
>>> +      - const: handover
>>> +      - const: stop-ack
>>> +
>>> +  clocks:
>>> +    minItems: 25
>>> +    maxItems: 25
>>
>> Drop both and instead describe the items. Anyway minItems are not needed
>> here.
>>
> Sure. I will drop min & max items and describe clocks.
> 
>>> +
>>> +  clock-names:
>>> +    minItems: 25
>>> +    maxItems: 25
>>
>> Drop both and instead list the names.
>>
> Sure. I will drop.
> 
>>> +
>>> +  assigned-clocks:
>>> +    minItems: 13
>>> +    maxItems: 13
>>
>> Drop, they do not have to be mentioned in the binding. If you think they
>> need to, then why?
>>
>>> +
>>> +  assigned-clock-rates:
>>> +    minItems: 13
>>> +    maxItems: 13
>>
>> Ditto
>>
>>> +
>>> +  qcom,smem-states:
>>> +    $ref: /schemas/types.yaml#/definitions/phandle-array
>>> +    description: States used by the AP to signal the remoteprocessor
>>> +    items:
>>> +      - description: Shutdown Q6
>>> +      - description: Stop Q6
>>> +
>>> +  qcom,smem-state-names:
>>> +    description:
>>> +      Names of the states used by the AP to signal the remoteprocessor
>>> +    items:
>>> +      - const: shutdown
>>> +      - const: stop
>>> +
>>> +  memory-region:
>>> +    items:
>>> +      - description: Q6 pd reserved region
>>> +
>>> +  glink-edge:
>>> +    $ref: /schemas/remoteproc/qcom,glink-edge.yaml#
>>
>> unevaluatedProperties: false
>>
> 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.
>>> +    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"
>>
>> Drop quotes
> Sure, will remove it.
>>
>>> +
>>> +      interrupts-extended:
>>
>> Same as before
>>
> Sure, will use 'interrupts'.
Please discard my previous reply.Here i couldn't able to use 
'interrupts' because i am using interrupts from other interrupt
controller than inherited one. Sorry for previous wrong reply.

Thanks & Regards,
Manikanta.
>>> +        items:
>>> +          - description: Fatal interrupt
>>> +          - description: Ready interrupt
>>> +          - description: Spawn acknowledge interrupt
>>> +          - description: Stop acknowledge interrupt
>>> +
>>> +      interrupt-names:
>>> +        items:
>>> +          - const: fatal
>>> +          - const: ready
>>> +          - const: spawn-ack
>>> +          - const: stop-ack
>>> +
>>> +      qcom,smem-states:
>>> +        $ref: /schemas/types.yaml#/definitions/phandle-array
>>> +        description: States used by the AP to signal the 
>>> remoteprocessor
>>> +        items:
>>> +          - description: Shutdown WCSS pd
>>> +          - description: Stop WCSS pd
>>> +          - description: Spawn WCSS pd
>>> +
>>> +      qcom,smem-state-names:
>>> +        description:
>>> +          Names of the states used by the AP to signal the 
>>> remoteprocessor
>>
>> remote processor
>>
> I will update.
> 
>>> +        items:
>>> +          - const: shutdown
>>> +          - const: stop
>>> +          - const: spawn
>>
>> This is confusing. Why your children have the same properties as parent?
>>
> Here both parent & child considered as remote processor. So once they 
> powered up/power down/crashed, they used to do some handshaking with 
> APPS processor. So interrupts are common between parent i.e root pd and 
> child i.e user pd
>>> +
>>> +    required:
>>> +      - compatible
>>> +
>>> +    additionalProperties: false
>>> +
>>> +required:
>>> +  - compatible
>>> +  - reg
>>> +  - interrupts-extended
>>
>> interrupts
>>
> Sure. I will use 'interrupts' instead of interrupts-extended
>>> +  - interrupt-names
>>> +  - qcom,smem-states
>>> +  - qcom,smem-state-names
>>> +  - memory-region
>>> +
>>> +additionalProperties: false
>>> +
>>> +allOf:
>>> +  - if:
>>> +      properties:
>>> +        compatible:
>>> +          enum:
>>> +            - qcom,ipq9574-q6-mpd
>>> +    then:
>>> +      properties:
>>> +        assigned-clocks:
>>> +          items:
>>> +            - description: Phandle, clock specifier of 
>>> GCC_ANOC_WCSS_AXI_M_CLK
>>> +            - description: Phandle, clock specifier of 
>>> GCC_WCSS_AHB_S_CLK
>>> +            - description: Phandle, clock specifier of 
>>> GCC_WCSS_ECAHB_CLK
>>> +            - description: Phandle, clock specifier of 
>>> GCC_WCSS_ACMT_CLK
>>> +            - description: Phandle, clock specifier of 
>>> GCC_WCSS_AXI_M_CLK
>>> +            - description: Phandle, clock specifier of GCC_Q6_AXIM_CLK
>>> +            - description: Phandle, clock specifier of GCC_Q6_AXIM2_CLK
>>> +            - description: Phandle, clock specifier of GCC_Q6_AHB_CLK
>>> +            - description: Phandle, clock specifier of GCC_Q6_AHB_S_CLK
>>> +            - description: Phandle, clock specifier of 
>>> GCC_Q6SS_BOOT_CLK
>>> +            - description: Phandle, clock specifier of 
>>> GCC_MEM_NOC_Q6_AXI_CLK
>>> +            - description: Phandle, clock specifier of 
>>> GCC_WCSS_Q6_TBU_CLK
>>> +            - description: Phandle, clock specifier of 
>>> GCC_SYS_NOC_WCSS_AHB_CLK
>>
>> Eh, so here they are. But Why? Do you expect different clocks for
>> others? If so, where are they?
>>
>> Anyway, drop useless "Phandle, clock specifier of". Clocks cannot be
>> anything else than phandle and a clock specifier. Instead of using some
>> cryptic ACRONYM_OR_SOME_CLK, describe them. Just like we do for other
>> bindings. You have plenty of good examples, so please start from them.
>>
>>
>>> +        assigned-clock-rates:
>>> +          items:
>>> +            - description: Must be 266666667 HZ
>>> +            - description: Must be 133333333 HZ
>>> +            - description: Must be 133333333 HZ
>>> +            - description: Must be 133333333 HZ
>>> +            - description: Must be 266666667 HZ
>>> +            - description: Must be 533000000 HZ
>>> +            - description: Must be 342857143 HZ
>>> +            - description: Must be 133333333 HZ
>>> +            - description: Must be 133333333 HZ
>>> +            - description: Must be 342857143 HZ
>>> +            - description: Must be 533000000 HZ
>>> +            - description: Must be 533000000 HZ
>>> +            - description: Must be 133333333 HZ
>>
>> ???
>>
>> If these are fixed, why this is in DT? DT is for variable and
>> non-discoverable pieces and you do not have here anything variable, but
>> fixed.
>>
>>> +
>>> +examples:
>>> +  - |
>>> +        #include <dt-bindings/interrupt-controller/arm-gic.h>
>>> +        #include <dt-bindings/clock/qcom,gcc-ipq5018.h>
>>> +        #include <dt-bindings/reset/qcom,gcc-ipq5018.h>
>>
>> Use 4 spaces for example indentation.
>>
> Sure, will use 4 spaces.
>>> +
>>> +        q6v5_wcss: remoteproc@cd00000 {
>>> +                compatible = "qcom,ipq5018-q6-mpd";
>>> +                #address-cells = <1>;
>>> +                #size-cells = <1>;
>>> +                ranges;
>>> +                reg = <0x0cd00000 0x4040>;
>>> +                interrupts-extended = <&intc GIC_SPI 291 
>>> IRQ_TYPE_EDGE_RISING>,
>>> +                                <&wcss_smp2p_in 0 0>,
>>
>> Wrong alignment of indentation
>>
> Sure, will update alignment.
>>> +                                <&wcss_smp2p_in 1 0>,
>>> +                                <&wcss_smp2p_in 2 0>,
>>> +                                <&wcss_smp2p_in 3 0>;
>>> +                interrupt-names = "wdog",
>>> +                                  "fatal",
>>> +                                  "ready",
>>> +                                  "handover",
>>> +                                  "stop-ack";
>>> +
>>> +                qcom,smem-states = <&wcss_smp2p_out 0>,
>>> +                                   <&wcss_smp2p_out 1>;
>>> +                qcom,smem-state-names = "shutdown",
>>> +                                        "stop";
>>> +
>>> +                memory-region = <&q6_region>;
>>> +
>>> +                glink-edge {
>>> +                        interrupts = <GIC_SPI 179 
>>> IRQ_TYPE_EDGE_RISING>;
>>> +                        label = "rtr";
>>> +                        qcom,remote-pid = <1>;
>>> +                        mboxes = <&apcs_glb 8>;
>>> +                };
>>> +
>>> +                q6_wcss_pd1: remoteproc_pd1 {
>>> +                        compatible = "qcom,ipq5018-wcss-ahb-mpd";
>>> +                        interrupts-extended = <&wcss_smp2p_in 8 0>,
>>> +                                        <&wcss_smp2p_in 9 0>,
>>> +                                        <&wcss_smp2p_in 12 0>,
>>> +                                        <&wcss_smp2p_in 11 0>;
>>> +                        interrupt-names = "fatal",
>>> +                                          "ready",
>>> +                                          "spawn-ack",
>>> +                                          "stop-ack";
>>> +                        qcom,smem-states = <&wcss_smp2p_out 8>,
>>> +                                           <&wcss_smp2p_out 9>,
>>> +                                           <&wcss_smp2p_out 10>;
>>> +                        qcom,smem-state-names = "shutdown",
>>> +                                                "stop",
>>> +                                                "spawn";
>>> +                };
>>> +
>>> +                q6_wcss_pd2: remoteproc_pd2 {
>>> +                        compatible = "qcom,ipq5018-wcss-pcie-mpd";
>>> +                        interrupts-extended = <&wcss_smp2p_in 16 0>,
>>> +                                        <&wcss_smp2p_in 17 0>,
>>> +                                        <&wcss_smp2p_in 20 0>,
>>> +                                        <&wcss_smp2p_in 19 0>;
>>> +                        interrupt-names = "fatal",
>>> +                                          "ready",
>>> +                                          "spawn-ack",
>>> +                                          "stop-ack";
>>> +
>>> +                        qcom,smem-states = <&wcss_smp2p_out 16>,
>>> +                                           <&wcss_smp2p_out 17>,
>>> +                                           <&wcss_smp2p_out 18>;
>>> +                        qcom,smem-state-names = "shutdown",
>>> +                                                "stop",
>>> +                                                "spawn";
>>> +                        status = "okay";
>>
>> Drop statuses from the example.
>>
> Sure, will drop status property.
>>
>> Best regards,
>> Krzysztof
>>
> 
> Thanks & Regards,
> Manikanta.