ARM: imx6q: clock and Kconfig update for PCIe support

Update imx6q clock initialization and Kconfig for PCIe support.
Signed-off-by: NSean Cross <xobs@kosagi.com>
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

arch/arm/mach-imx/Kconfig

@@ -802,6 +802,8 @@ config SOC_IMX6Q
 	select HAVE_IMX_SRC
 	select HAVE_SMP
 	select MFD_SYSCON
+	select MIGHT_HAVE_PCI
+	select PCI_DOMAINS if PCI
 	select PINCTRL
 	select PINCTRL_IMX6Q
 	select PL310_ERRATA_588369 if CACHE_PL310

arch/arm/mach-imx/clk-imx6q.c

@@ -623,6 +623,10 @@ static void __init imx6q_clocks_init(struct device_node *ccm_node)
 	if (ret)
 		pr_warn("failed to set up CLKO: %d\n", ret);
 
+	/* All existing boards with PCIe use LVDS1 */
+	if (IS_ENABLED(CONFIG_PCI_IMX6))
+		clk_set_parent(clk[lvds1_sel], clk[sata_ref]);
+
 	/* Set initial power mode */
 	imx6q_set_lpm(WAIT_CLOCKED);