clk: rockchip: rk3288: i2s_frac adds flag to set parent's rate

The relation of i2s nodes as follows:
          i2s_src               0           0            594000000  0
             i2s_frac           0           0            11289600   0
                i2s_pre         0           0            11289600   0
                   sclk_i2s0    0           0            11289600   0
                   i2s0_clkout  0           0            11289600   0
                      hclk_i2s0 1           1            99000000   0

sclk_i2s0 is the master clock, when to set rate of sclk_i2s0, should
allow to set its parent's rate, by add flag CLK_SET_RATE_PARENT for
"i2s_frac", "i2s_pre", "i2s0_clkout" and "sclk_i2s0".

Tested on rk3288 board using max98090, with command "aplay <music.wav>"

Change-Id: I12faad082566532b65a7de8c0a6845e1c17870e6
Signed-off-by: Jianqun <jay.xu@rock-chips.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

drivers/clk/rockchip/clk-rk3288.c

@@ -300,15 +300,15 @@ static struct rockchip_clk_branch rk3288_clk_branches[] __initdata = {
 	COMPOSITE(0, "i2s_src", mux_pll_src_cpll_gpll_p, 0,
 			RK3288_CLKSEL_CON(4), 15, 1, MFLAGS, 0, 7, DFLAGS,
 			RK3288_CLKGATE_CON(4), 1, GFLAGS),
-	COMPOSITE_FRAC(0, "i2s_frac", "i2s_src", 0,
+	COMPOSITE_FRAC(0, "i2s_frac", "i2s_src", CLK_SET_RATE_PARENT,
 			RK3288_CLKSEL_CON(8), 0,
 			RK3288_CLKGATE_CON(4), 2, GFLAGS),
-	MUX(0, "i2s_pre", mux_i2s_pre_p, 0,
+	MUX(0, "i2s_pre", mux_i2s_pre_p, CLK_SET_RATE_PARENT,
 			RK3288_CLKSEL_CON(4), 8, 2, MFLAGS),
-	COMPOSITE_NODIV(0, "i2s0_clkout", mux_i2s_clkout_p, 0,
+	COMPOSITE_NODIV(0, "i2s0_clkout", mux_i2s_clkout_p, CLK_SET_RATE_PARENT,
 			RK3288_CLKSEL_CON(4), 12, 1, MFLAGS,
 			RK3288_CLKGATE_CON(4), 0, GFLAGS),
-	GATE(SCLK_I2S0, "sclk_i2s0", "i2s_pre", 0,
+	GATE(SCLK_I2S0, "sclk_i2s0", "i2s_pre", CLK_SET_RATE_PARENT,
 			RK3288_CLKGATE_CON(4), 3, GFLAGS),
 
 	MUX(0, "spdif_src", mux_pll_src_cpll_gpll_p, 0,