The following four new functions enable clocking SoC from HSE crystal: rcc_clock_setup_in_hse_8mhz_out_{8,16,32,48}mhz These functions start HSE as external clock and feed its output to PLL if higher frequency is needed. Signed-off-by: Sergey Matyukevich <geomatsi@gmail.com> Reviewed-by: Karl Palsson <karlp@tweak.net.au> -> Dropped 8,16,32Mhz functions as superfluous.