[U-Boot] [PATCH 1/7] mx7ulp: Print the LDO mode status

Fabio Estevam
2019-10-21T13:50:28Z

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>
---
arch/arm/mach-imx/mx7ulp/soc.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)

diff --git a/arch/arm/mach-imx/mx7ulp/soc.c b/arch/arm/mach-imx/mx7ulp/soc.c
index 127fcfeea1..b9a108a514 100644
--- a/arch/arm/mach-imx/mx7ulp/soc.c
+++ b/arch/arm/mach-imx/mx7ulp/soc.c
@@ -131,6 +131,21 @@ 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;
@@ -159,6 +174,11 @@ 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
--
2.17.1