ARM: imx6: report soc info via soc device

The patch enables soc bus infrastructure and adds a function
imx_soc_device_init() to report soc info via soc device interface for
imx6qdl and imx6sl.  With the support, user space can get soc related
info by looking at sysfs like below.

  $ cat /sys/devices/soc0/machine
  Freescale i.MX6 Quad SABRE Smart Device Board
  $ cat /sys/devices/soc0/family
  Freescale i.MX
  $ cat /sys/devices/soc0/soc_id
  i.MX6Q
  $ cat /sys/devices/soc0/revision
  1.2

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

1 files changed, 7 insertions, 1 deletions

diff --git a/arch/arm/mach-imx/mach-imx6q.c b/arch/arm/mach-imx/mach-imx6q.c
index 1bdd0be429b..049e36edc14 100644
--- a/arch/arm/mach-imx/mach-imx6q.c
+++ b/arch/arm/mach-imx/mach-imx6q.c
@@ -162,12 +162,18 @@ static void __init imx6q_1588_init(void)
 
 static void __init imx6q_init_machine(void)
 {
+	struct device *parent;
+
 	imx_print_silicon_rev(cpu_is_imx6dl() ? "i.MX6DL" : "i.MX6Q",
 			      imx_get_soc_revision());
 
+	parent = imx_soc_device_init();
+	if (parent == NULL)
+		pr_warn("failed to initialize soc device\n");
+
 	imx6q_enet_phy_init();
 
-	of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
+	of_platform_populate(NULL, of_default_bus_match_table, NULL, parent);
 
 	imx_anatop_init();
 	imx6q_pm_init();