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


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@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@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/?

>> + 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@arm.com>
>> M: Lorenzo Pieralisi <lpieralisi@kernel.org>
>> L: linux-arm-kernel@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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