[U-Boot] [RESEND PATCH v4 2/2] TI: DaVinci DA850 EVM: support passing maximum allowed cpu clock rate information to kernel

[Paulraj, Sandeep]

> 
> The TI DA850/OMAP-L138/AM18x EVM can be populated with devices
> having different maximum allowed CPU clock rating.
> 
> The maximum clock the chip can support can only be determined from
> the label on the package (not software readable).
> 
> Introduce a method to pass the maximum allowed clock rate information
> to kernel using ATAG_REVISION. The kernel uses this information to
> determine the maximum cpu clock rate reachable using cpufreq.
> 
> Note that U-Boot itself does not set the CPU clock rate. The CPU
> clock is setup by a primary bootloader ("UBL"). The rate setup by
> UBL could be different from the maximum clock rate supported by the
> device.
> 
> Signed-off-by: Sekhar Nori <nsekhar at ti.com>

Pushed to u-boot-ti

--Sandeep