Merge tag 'juno-updates-6.16' of https://git.kernel.org/pub/scm/linux/kernel/git...

Armv8 Juno/FVP updates for v6.16

Few updates to the Arm FVP(Fixed Virtual Platform) device tree, enhancing
support for system tracing, power management, and firmware coexistence:

1. ETE and TRBE support
   Adds CoreSight ETE and TRBE nodes for the FVP Rev C model. These are
   disabled by default as they need to be enabled explicitly via model
   parameters.

2. CPU idle states and system timer for idle broadcast
   Introduces CPU idle state definitions but disabled by default due to
   potential performance impact on the model. Also adds a system-level
   broadcast timer for use when CPUs enter deep idle states where local
   timers stop.

3. Firmware memory reservation
   Reserves 64MB at the end of the first DRAM bank to prevent conflicts
   with FF-A firmware or similar configurations that rely on this region.

4. Drop the unnecessary clock-frequency property in the timer nodes
   The boot/secure firmware must configure the timer clock frequency and
   the non-secure OS must be able to read the same. The clock-frequency is
   generally used when the firmware is broken which is not the case on
   most of the fast models and Juno platform.

As noted above some of the changes are disabled by default where applicable
to ensure backward compatibility and avoid unintended performance impact
on platforms using default model parameters.

* tag 'juno-updates-6.16' of https://git.kernel.org/pub/scm/linux/kernel/git/sudeep.holla/linux:
  arm64: dts: fvp: Add ETE and TRBE nodes for Rev C model
  arm64: dts: arm: Drop the clock-frequency property from timer nodes
  arm64: dts: fvp: Reserve 64MB for the FF-A firmware in memory map
  arm64: dts: fvp: Add CPU idle states for Rev C model
  arm64: dts: fvp: Add system timer for broadcast during CPU idle

Link: https://lore.kernel.org/r/20250513143827.3606686-1-sudeep.holla@arm.com
Signed-off-by: Arnd Bergmann <arnd@arndb.de>