> When the MFG PLL clock, which is upstream of the MFG clock, is changed, > the downstream clock and consumers need to be switched away from the PLL > over to a stable clock to avoid glitches. > > This is done through the use of the newly added clk mux notifier. The > notifier is set on the mux itself instead of the upstream PLL, but in > practice this works, as the rate change notifitcations are propogated > throughout the sub-tree hanging off the PLL. Just before rate changes, > the MFG mux is temporarily and transparently switched to the 26 MHz > main crystal. After the rate change, the mux is switched back. > > Signed-off-by: Chen-Yu Tsai <wenst@xxxxxxxxxxxx> > [Angelo: Rebased to assign clk_ops in mtk_mux_nb] > Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx> > Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx> Reviewed-by: Miles Chen <miles.chen@xxxxxxxxxxxx>
