VCPROP_CLK_ARM
.id = htole32(VCPROP_CLK_ARM)
VCPROP_CLK_ARM, &sc->sc_cpu_minrate);
VCPROP_CLK_ARM, &sc->sc_cpu_maxrate);
VCPROP_CLK_ARM, &rate);
VCPROP_CLK_ARM, MHZ2RATE(fq));