rockchip: clk: Add rk3368 SARADC clock support

The clk_saradc is dividing from the 24M, clk_saradc=24MHz/(saradc_div_con+1).
SARADC integer divider control register is 8-bits width.

Signed-off-by: David Wu <david.wu@rock-chips.com>
Acked-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
diff --git a/arch/arm/include/asm/arch-rockchip/cru_rk3368.h b/arch/arm/include/asm/arch-rockchip/cru_rk3368.h
index 2b1197f..5f6a5fb 100644
--- a/arch/arm/include/asm/arch-rockchip/cru_rk3368.h
+++ b/arch/arm/include/asm/arch-rockchip/cru_rk3368.h
@@ -89,6 +89,11 @@
 	MCU_CLK_DIV_SHIFT		= 0,
 	MCU_CLK_DIV_MASK		= GENMASK(4, 0),
 
+	/* CLKSEL_CON25 */
+	CLK_SARADC_DIV_CON_SHIFT	= 8,
+	CLK_SARADC_DIV_CON_MASK		= GENMASK(15, 8),
+	CLK_SARADC_DIV_CON_WIDTH	= 8,
+
 	/* CLKSEL43_CON */
 	GMAC_MUX_SEL_EXTCLK             = BIT(8),