Add support to run 800Mhz speed grade parts at 650MHz

[neerajdantu]

This patch allows running 800MHz speed grade superset devices at 650MHz by adding OPP hardware ID of 800MHz speed grade parts to 650MHz OPP table.

[patrickdelaunay]

First point: modification need to done in kernel device tree first, then U-Boot device tree.

Normally the U-Boot device tree (soc and board part ) are aligned with Linux kernel, only -u-boot*.dtsi
add some specific U-Boot node/properties.

Second point: I think today the the OPP managed by STM32MP15xF Soc variant are 800MHz and 400MHz
at purpose

=> allow fast frequency switch (only managed by one divider) without PLL1 reconfiguration.

need to be check by Linux team when pull request will be pushed on their DT

Regard Patrick

[patrickdelaunay]

See Linux answer for the same pull request

STMicroelectronics/linux#19 (comment)

[patrickdelaunay]

closed as Linux pul request on same patch => STMicroelectronics/linux#19