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Message-ID: <4d2501a7-d56d-4736-95d7-41556166859b@linaro.org>
Date: Tue, 5 Mar 2024 18:12:18 +0100
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Subject: Re: [RFC 0/3] Enable firmware-managed USB resources on Qcom targets
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To: Sriram Dash <quic_sriramd@quicinc.com>, andersson@kernel.org,
 konrad.dybcio@linaro.org, vkoul@kernel.org, kishon@kernel.org,
 robh@kernel.org, krzysztof.kozlowski+dt@linaro.org, conor+dt@kernel.org,
 gregkh@linuxfoundation.org, quic_wcheng@quicinc.com,
 Thinh.Nguyen@synopsys.com, p.zabel@pengutronix.de,
 linux-arm-msm@vger.kernel.org, linux-phy@lists.infradead.org,
 devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
 linux-usb@vger.kernel.org, quic_psodagud@quicinc.com,
 quic_nkela@quicinc.com, manivannan.sadhasivam@linaro.org,
 ulf.hansson@linaro.org, sudeep.holla@arm.com, quic_shazhuss@quicinc.com
References: <1709657858-8563-1-git-send-email-quic_sriramd@quicinc.com>
From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
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In-Reply-To: <1709657858-8563-1-git-send-email-quic_sriramd@quicinc.com>
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On 05/03/2024 17:57, Sriram Dash wrote:
> Some target systems allow multiple resources to be managed by firmware.

Which? Why this is so vague...

> On these targets, tasks related to clocks, regulators, resets, and
> interconnects can be delegated to the firmware, while the remaining
> responsibilities are handled by Linux.
> 
> To support the management of partial resources in Linux and leave the rest
> to firmware, multiple power domains are introduced. Each power domain can
> manage one or more resources, depending on the specific use case.
> 
> These power domains handle SCMI calls to the firmware, enabling the
> activation and deactivation of firmware-managed resources.
> 
> The driver is responsible for managing multiple power domains and
> linking them to consumers as needed. Incase there is only single
> power domain, it is considered to be a standard GDSC hooked on to
> the qcom dt node which is read and assigned to device structure
> (by genpd framework) before the driver probe even begins.

This will break the ABI. Sorry, come with an ABI stable solution.

Best regards,
Krzysztof