linux-kernel - Re: [RFC PATCH 3/4] dt-bindings: power: reset: Document arm,psci-vendor-reset

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Message-ID: <fc97d073-f8c8-1166-db99-3d7c0313a350@quicinc.com>
Date:   Wed, 26 Jul 2023 10:18:56 -0700
From:   Elliot Berman <quic_eberman@...cinc.com>
To:     Rob Herring <robh@...nel.org>
CC:     Mark Rutland <mark.rutland@....com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Sebastian Reichel <sre@...nel.org>,
        "Krzysztof Kozlowski" <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-pm@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-msm@...r.kernel.org>, <kernel@...cinc.com>,
        Satya Durga Srinivasu Prabhala <quic_satyap@...cinc.com>,
        Melody Olvera <quic_molvera@...cinc.com>,
        "Prasad Sodagudi" <quic_psodagud@...cinc.com>
Subject: Re: [RFC PATCH 3/4] dt-bindings: power: reset: Document
 arm,psci-vendor-reset



On 7/26/2023 6:45 AM, Rob Herring wrote:
> On Tue, Jul 25, 2023 at 12:01 PM Elliot Berman <quic_eberman@...cinc.com> wrote:
>>
>>
>>
>> On 7/24/2023 4:23 PM, Rob Herring wrote:
>>> On Mon, Jul 24, 2023 at 03:30:53PM -0700, Elliot Berman wrote:
>>>> Add devicetree bindings for using PSCI SYSTEM_RESET2 with vendor reset  types.
>>>>
>>>> Signed-off-by: Elliot Berman <quic_eberman@...cinc.com>
>>>> ---
>>>>    .../power/reset/arm,psci-vendor-reset.yaml    | 35 +++++++++++++++++++
>>>>    MAINTAINERS                                   |  1 +
>>>>    2 files changed, 36 insertions(+)
>>>>    create mode 100644 Documentation/devicetree/bindings/power/reset/arm,psci-vendor-reset.yaml
>>>>
>>>> diff --git a/Documentation/devicetree/bindings/power/reset/arm,psci-vendor-reset.yaml b/Documentation/devicetree/bindings/power/reset/arm,psci-vendor-reset.yaml
>>>> new file mode 100644
>>>> index 000000000000..18b0b8c167a1
>>>> --- /dev/null
>>>> +++ b/Documentation/devicetree/bindings/power/reset/arm,psci-vendor-reset.yaml
>>>> @@ -0,0 +1,35 @@
>>>> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
>>>> +# Copyright 2023 Qualcomm Innovation Center, Inc. All Rights Reserved.
>>>> +%YAML 1.2
>>>> +---
>>>> +$id: http://devicetree.org/schemas/power/reset/arm,psci-vendor-reset.yaml#
>>>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>>>> +
>>>> +title: PSCI SYSTEM_RESET2 Vendor Resets
>>>> +
>>>> +maintainers:
>>>> +  - Elliot Berman <quic_eberman@...cinc.com>
>>>> +
>>>> +description: |
>>>> +  PSCI SYSTEM_RESET2 supports vendor-defined reset types. This describes
>>>> +  the conversion of reboot modes to the reset types.
>>>> +
>>>> +properties:
>>>> +  compatible:
>>>> +    const: arm,psci-vendor-reset
>>>> +
>>>> +allOf:
>>>> +  - $ref: reboot-mode.yaml#
>>>> +
>>>> +additionalProperties: false
>>>> +
>>>> +examples:
>>>> +  - |
>>>> +    firmware {
>>>> +      psci-vendor-resets {
>>>> +        compatible = "arm,psci-vendor-reset";
>>>
>>> We already have a node for PSCI, we don't need a second one. You can
>>> have a separate driver without a separate node.
>>>
>>
>> I could also place the reboot-mode functionality straight into
>> drivers/firwmare/psci/? I thought that might be more controversial than
>> separate driver, but maybe not?
>>
>> Mark/Loreno, do you have any concerns to add the reboot-mode driver
>> functionality directly in drivers/firmware/psci/psci.c?
> 
> I'm talking about the binding. Why are you talking about driver
> design? They are independent.

Apologies, I agree to make it part of the same node. I believe it 
requires some changes to PSCI driver to create/bind the vendor restart 
device. I wanted to see how Mark and Lorenzo wanted to incorporate the 
vendor resets into PSCI driver: maybe I don't even create a 
device/driver and simply incorporate the changes into PSCI driver directly.