mx7ulp: Print the LDO mode status

As per the i.MX7ULP datasheet, it can boot in LDO enabled mode
or LDO bypass mode.

Print the LDO mode status in the U-Boot log for convenience.

Signed-off-by: Fabio Estevam <festevam@gmail.com>

diff --git a/arch/arm/mach-imx/mx7ulp/soc.c b/arch/arm/mach-imx/mx7ulp/soc.c
index 4b6014e7241f13456659c30bbaa3c6b5bbcea139..4343cac99c745d1592b0b31c597202afca5eb494 100644 (file)
--- a/arch/arm/mach-imx/mx7ulp/soc.c
+++ b/arch/arm/mach-imx/mx7ulp/soc.c
@@ -132,6 +132,21 @@ const char *get_imx_type(u32 imxtype)
        return "7ULP";
 }
 
+#define PMC0_BASE_ADDR         0x410a1000
+#define PMC0_CTRL              0x28
+#define PMC0_CTRL_LDOEN                BIT(31)
+
+static bool ldo_mode_is_enabled(void)
+{
+       unsigned int reg;
+
+       reg = readl(PMC0_BASE_ADDR + PMC0_CTRL);
+       if (reg & PMC0_CTRL_LDOEN)
+               return true;
+       else
+               return false;
+}
+
 int print_cpuinfo(void)
 {
        u32 cpurev;
@@ -160,6 +175,11 @@ int print_cpuinfo(void)
                break;
        }
 
+       if (ldo_mode_is_enabled())
+               printf("PMC1:  LDO enabled mode\n");
+       else
+               printf("PMC1:  LDO bypass mode\n");
+
        return 0;
 }
 #endif