ddr: imx: Add 3600 MTps rate support

Add PLL settings for DDR 3600 MTps . This is very similar to 3200 MTps
PLL setting, except the divider is not 9 but 8 .

Signed-off-by: Marek Vasut <marex@denx.de>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
diff --git a/arch/arm/mach-imx/imx8m/clock_imx8mm.c b/arch/arm/mach-imx/imx8m/clock_imx8mm.c
index 9868707..a24eb74 100644
--- a/arch/arm/mach-imx/imx8m/clock_imx8mm.c
+++ b/arch/arm/mach-imx/imx8m/clock_imx8mm.c
@@ -56,6 +56,7 @@
 static struct imx_int_pll_rate_table imx8mm_fracpll_tbl[] = {
 	PLL_1443X_RATE(1000000000U, 250, 3, 1, 0),
 	PLL_1443X_RATE(933000000U, 311, 4, 1, 0),
+	PLL_1443X_RATE(900000000U, 300, 8, 0, 0),
 	PLL_1443X_RATE(800000000U, 300, 9, 0, 0),
 	PLL_1443X_RATE(750000000U, 250, 8, 0, 0),
 	PLL_1443X_RATE(650000000U, 325, 3, 2, 0),
diff --git a/drivers/ddr/imx/phy/ddrphy_utils.c b/drivers/ddr/imx/phy/ddrphy_utils.c
index d5dac0f..45e1a70 100644
--- a/drivers/ddr/imx/phy/ddrphy_utils.c
+++ b/drivers/ddr/imx/phy/ddrphy_utils.c
@@ -117,6 +117,10 @@
 		dram_pll_init(MHZ(933));
 		dram_disable_bypass();
 		break;
+	case 3600:
+		dram_pll_init(MHZ(900));
+		dram_disable_bypass();
+		break;
 	case 3200:
 		dram_pll_init(MHZ(800));
 		dram_disable_bypass();