[RFC PATCH 3/4] dt-bindings: power: reset: Document arm,psci-vendor-reset
Elliot Berman
quic_eberman at quicinc.com
Tue Jul 25 13:26:46 PDT 2023
On 7/25/2023 11:01 AM, Elliot Berman 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 at quicinc.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 at quicinc.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?
>
> Sebastian, do you have any concerns to have this reboot-mode driver
> outside drivers/power/reset/?
>
Sebastian, please disregard this question.
Mukesh pointed out that reboot-mode framework isn't the right option
here since this driver does the actual reset and, as I understand,
reboot-mode isn't intended to do actual reset. I'm going to implement
something similar to what reboot-mode framework does but register
against the restart_handler_list instead of reboot_notifier_list.
>>> + reboot-normal = <0x100>;
>>
>> Wouldn't 'normal' be the normal PSCI reset?
>>
>
> Ah, right. I had my head buried in the reboot-mode code when creating
> the example. I can remove from the example.
>
>>> + reboot-bootloader = <0x101>;
>>> + reboot-fastboot = <0x102>;
>>> + };
>>> + };
>>> diff --git a/MAINTAINERS b/MAINTAINERS
>>> index d516295978a4..2da4c5f1917b 100644
>>> --- a/MAINTAINERS
>>> +++ b/MAINTAINERS
>>> @@ -16982,6 +16982,7 @@ M: Mark Rutland <mark.rutland at arm.com>
>>> M: Lorenzo Pieralisi <lpieralisi at kernel.org>
>>> L: linux-arm-kernel at lists.infradead.org (moderated for
>>> non-subscribers)
>>> S: Maintained
>>> +F:
>>> Documentation/devicetree/bindings/power/reset/arm,psci-vendor-reset.yaml
>>> F: drivers/firmware/psci/
>>> F: include/linux/psci.h
>>> F: include/uapi/linux/psci.h
>>> --
>>> 2.41.0
>>>
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