clk: ingenic/jz4740: Fix "pll half" divider not read/written properly

The code was setting the bit 21 of the CPCCR register to use a divider
of 2 for the "pll half" clock, and clearing the bit to use a divider
of 1.

This is the opposite of how this register field works: a cleared bit
means that the /2 divider is used, and a set bit means that the divider
is 1.

Restore the correct behaviour using the newly introduced .div_table
field.
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Link: https://lkml.kernel.org/r/20190701113606.4130-1-paul@crapouillou.netSigned-off-by: Stephen Boyd <sboyd@kernel.org>

drivers/clk/ingenic/jz4740-cgu.c

@@ -53,6 +53,10 @@ static const u8 jz4740_cgu_cpccr_div_table[] = {
 	1, 2, 3, 4, 6, 8, 12, 16, 24, 32,
 };
 
+static const u8 jz4740_cgu_pll_half_div_table[] = {
+	2, 1,
+};
+
 static const struct ingenic_cgu_clk_info jz4740_cgu_clocks[] = {
 
 	/* External clocks */
@@ -86,7 +90,10 @@ static const struct ingenic_cgu_clk_info jz4740_cgu_clocks[] = {
 	[JZ4740_CLK_PLL_HALF] = {
 		"pll half", CGU_CLK_DIV,
 		.parents = { JZ4740_CLK_PLL, -1, -1, -1 },
-		.div = { CGU_REG_CPCCR, 21, 1, 1, -1, -1, -1 },
+		.div = {
+			CGU_REG_CPCCR, 21, 1, 1, -1, -1, -1,
+			jz4740_cgu_pll_half_div_table,
+		},
 	},
 
 	[JZ4740_CLK_CCLK] = {