linux-kernel - Re: [PATCH v4 2/3] dt-bindings: remoteproc: qcom: Convert SC7280 MSS bindings to YAML

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Date:   Sat, 21 May 2022 00:16:58 +0530
From:   Sibi Sankar <quic_sibis@...cinc.com>
To:     Stephen Boyd <swboyd@...omium.org>, <bjorn.andersson@...aro.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <robh+dt@...nel.org>
CC:     <ohad@...ery.com>, <agross@...nel.org>,
        <mathieu.poirier@...aro.org>, <linux-arm-msm@...r.kernel.org>,
        <linux-remoteproc@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <mka@...omium.org>
Subject: Re: [PATCH v4 2/3] dt-bindings: remoteproc: qcom: Convert SC7280 MSS
 bindings to YAML

Hey Stephen,

On 5/20/22 4:05 AM, Stephen Boyd wrote:
> Quoting Sibi Sankar (2022-05-19 09:47:04)
>> diff --git a/Documentation/devicetree/bindings/remoteproc/qcom,sc7280-mss-pil.yaml b/Documentation/devicetree/bindings/remoteproc/qcom,sc7280-mss-pil.yaml
>> new file mode 100644
>> index 000000000000..a936d84eefa6
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/remoteproc/qcom,sc7280-mss-pil.yaml
>> @@ -0,0 +1,250 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/remoteproc/qcom,sc7280-mss-pil.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Qualcomm SC7280 MSS Peripheral Image Loader
>> +
>> +maintainers:
>> +  - Sibi Sankar <quic_sibis@...cinc.com>
>> +
>> +description:
>> +  This document describes the hardware for a component that loads and boots firmware
>> +  on the Qualcomm Technology Inc. SC7280 Modem Hexagon Core.
>> +
>> +properties:
>> +  compatible:
>> +    enum:
>> +      - qcom,sc7280-mss-pil
>> +
> [..]
>> +
>> +  resets:
>> +    items:
>> +      - description: AOSS restart
>> +      - description: PDC reset
>> +
>> +  reset-names:
>> +    items:
>> +      - const: mss_restart
>> +      - const: pdc_reset
>> +
>> +  memory-region:
>> +    maxItems: 2
>> +    description: Phandle reference to the reserved-memory for the MBA region followed
>> +                 by the modem region.
>> +
>> +  firmware-name:
>> +    $ref: /schemas/types.yaml#/definitions/string-array
>> +    maxItems: 2
> 
> Instead of maxItems can this be
> 
>         items:
>           - description: Name of MBA firmware
> 	 - description: Name of modem firmware
> 
> so that we know the order? Same for 'memory-region' above.

ack

> 
>> +    description:
>> +      The name of the MBA and modem firmware to be loaded for this remote processor.
>> +
>> +  qcom,halt-regs:
>> +    $ref: /schemas/types.yaml#/definitions/phandle-array
> 
> Should this have maxItems: 1? Or that's implicit from description?

It's implicit!

> 
>> +    description:
>> +      Phandle reference to a syscon representing TCSR followed by the
>> +      four offsets within syscon for q6, modem, nc and vq6 halt registers.
>> +
>> +  qcom,ext-regs:
>> +    $ref: /schemas/types.yaml#/definitions/phandle-array
> 
> Should this have min/maxItems: 2?

ack

> 
>> +    description:
>> +      Two phandle references to syscons representing TCSR_REG and TCSR register
>> +      space followed by the two offsets within the syscon to force_clk_en/rscc_disable
>> +      and axim1_clk_off/crypto_clk_off registers respectively.
>> +
>> +  qcom,qaccept-regs:
>> +    $ref: /schemas/types.yaml#/definitions/phandle-array
>> +    description:
>> +      Phandle reference to a syscon representing TCSR followed by the
>> +      three offsets within syscon for mdm, cx and axi qaccept registers.
>> +
>> +  qcom,qmp:
>> +    $ref: /schemas/types.yaml#/definitions/phandle
>> +    description: Reference to the AOSS side-channel message RAM.
>> +
>> +  qcom,smem-states:
>> +    $ref: /schemas/types.yaml#/definitions/phandle-array
>> +    description: States used by the AP to signal the Hexagon core
>> +    items:
>> +      - description: Stop the modem
> 
> This one did items for a phandle array so I think we should follow the
> same above.

ack

> 
>> +
>> +  qcom,smem-state-names:
>> +    description: The names of the state bits used for SMP2P output
>> +    const: stop
>> +
>> +  glink-edge:
>> +    $ref: qcom,glink-edge.yaml#
>> +    description:
>> +      Qualcomm G-Link subnode which represents communication edge, channels
>> +      and devices related to the DSP.
> [..]
>> +        power-domain-names = "cx", "mss";
>> +
>> +        memory-region = <&mba_mem>, <&mpss_mem>;
>> +
>> +        qcom,qmp = <&aoss_qmp>;
>> +
>> +        qcom,smem-states = <&modem_smp2p_out 0>;
>> +        qcom,smem-state-names = "stop";
>> +
>> +        resets = <&aoss_reset AOSS_CC_MSS_RESTART>,
>> +                 <&pdc_reset PDC_MODEM_SYNC_RESET>;
>> +        reset-names = "mss_restart", "pdc_reset";
>> +
>> +        qcom,halt-regs = <&tcsr_mutex 0x23000 0x25000 0x28000 0x33000>;
>> +        qcom,ext-regs = <&tcsr 0x10000 0x10004 &tcsr_mutex 0x26004 0x26008>;
> 
> Because it's two items I'd expect:
> 	
> 	<&tcsr 0x10000 0x10004>, <&tcsr_mutex 0x26004 0x26008>;

I guess both the ways work since the driver uses
of_parse_phandle_with_fixed_args.

> 
>> +        qcom,qaccept-regs = <&tcsr_mutex 0x23030 0x23040 0x23020>;
>> +
>> +        glink-edge {
>> +            interrupts-extended = <&ipcc IPCC_CLIENT_MPSS
>> +                                   IPCC_MPROC_SIGNAL_GLINK_QMP
>> +                                   IRQ_TYPE_EDGE_RISING>;