Re: [PATCH v7 0/8] Enable QUPs and Serial on SA8255p Qualcomm platforms

Krzysztof Kozlowski
2025-07-22T06:28:02Z

On Mon, Jul 21, 2025 at 11:15:24PM +0530, Praveen Talari wrote:
> The Qualcomm automotive SA8255p SoC relies on firmware to configure
> platform resources, including clocks, interconnects and TLMM. The device
> drivers request resources operations over SCMI using power and
> performance protocols.
>
> The SCMI power protocol enables or disables resources like clocks,
> interconnect paths, and TLMM (GPIOs) using runtime PM framework APIs,
> such as resume/suspend, to control power states(on/off).
>
> The SCMI performance protocol manages UART baud rates, with each baud
> rate represented by a performance level. Drivers use the
> dev_pm_opp_set_level() API to request the desired baud rate by
> specifying the performance level.
>
> The QUP drivers are SCMI clients, with clocks, interconnects, pinctrl
> and power-domains abstracted by a SCMI server.
>
> The serial driver has a dependency on the dev_pm_opp_set_level() function,
> which is applied in the OPP tree's linux-next branch.

Where is the changelog with lore links?

Best regards,
Krzysztof