[PATCH v2 2/5] clk: bcm: rpi: Turn firmware clock on/off when preparing/unpreparing

[Stephen Boyd]

Quoting Maíra Canal (2025-07-31 14:06:18)
> Currently, when we prepare or unprepare RPi's clocks, we don't actually
> enable/disable the firmware clock. This means that
> `clk_disable_unprepare()` doesn't actually change the clock state at
> all, nor does it lowers the clock rate.
> 
> From the Mailbox Property Interface documentation [1], we can see that
> we should use `RPI_FIRMWARE_SET_CLOCK_STATE` to set the clock state
> off/on. Therefore, use `RPI_FIRMWARE_SET_CLOCK_STATE` to create a
> prepare and an unprepare hook for RPi's firmware clock.
> 
> As now the clocks are actually turned off, some of them are now marked
> CLK_IS_CRITICAL, as those are required to be on during the whole system
> operation.
> 
> Link: https://github.com/raspberrypi/firmware/wiki/Mailbox-property-interface [1]
> Signed-off-by: Maíra Canal <mcanal at igalia.com>
> 
> ---

Applied to clk-next