clk: mmp: frac: Allow setting bits other than the numerator/denominator

For the I2S fractional clocks, there are more bits that need to be set
for the clock to run. Their actual meaning is unknown.
Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Link: https://lkml.kernel.org/r/20200519224151.2074597-3-lkundrak@v3.skSigned-off-by: Stephen Boyd <sboyd@kernel.org>

drivers/clk/mmp/clk-frac.c

@@ -148,7 +148,10 @@ static int clk_factor_init(struct clk_hw *hw)
 		val &= ~(masks->den_mask << masks->den_shift);
 		val |= (factor->ftbl[0].den & masks->den_mask) <<
 			masks->den_shift;
+	}
 
+	if (!(val & masks->enable_mask) || i >= factor->ftbl_cnt) {
+		val |= masks->enable_mask;
 		writel(val, factor->base);
 	}
 

drivers/clk/mmp/clk.h

@@ -16,6 +16,7 @@ struct mmp_clk_factor_masks {
 	unsigned int den_mask;
 	unsigned int num_shift;
 	unsigned int den_shift;
+	unsigned int enable_mask;
 };
 
 struct mmp_clk_factor_tbl {