clk: rockchip: save width in struct clk_fractional_divider

The ->mwidth and ->nwidth fields will be used by clk-fractional-divider when it
will be switched to rational base approximation algorithm.
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

drivers/clk/rockchip/clk.c

@@ -135,9 +135,11 @@ static struct clk *rockchip_clk_register_frac_branch(const char *name,
 	div->flags = div_flags;
 	div->reg = base + muxdiv_offset;
 	div->mshift = 16;
-	div->mmask = 0xffff0000;
+	div->mwidth = 16;
+	div->mmask = GENMASK(div->mwidth - 1, 0) << div->mshift;
 	div->nshift = 0;
-	div->nmask = 0xffff;
+	div->nwidth = 16;
+	div->nmask = GENMASK(div->nwidth - 1, 0) << div->nshift;
 	div->lock = lock;
 	div_ops = &clk_fractional_divider_ops;