arm: am437x: cm-t43: set MPU and CORE voltages on boot
During boot, U-Boot raises the CPU frequency but the CORE and MPU regulators
are not updated. This is not a problem in cold boot since the default values
that the pmic outputs are correct, but if Linux were to switch the module to a
low power OPP, the new voltage values will be retained after a reboot and the
module will likely hang once U-Boot raises the CPU frequency back up.
Set both CORE and MPU regulators to to 1.1V on boot.
Cc: Tom Rini <trini@konsulko.com>
Cc: Albert Aribaud <albert.u.boot@aribaud.net>
Cc: Igor Grinberg <grinberg@compulab.co.il>
Signed-off-by: Nikita Kiryanov <nikita@compulab.co.il>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/board/compulab/cm_t43/spl.c b/board/compulab/cm_t43/spl.c
index 520de24..b7d118e 100644
--- a/board/compulab/cm_t43/spl.c
+++ b/board/compulab/cm_t43/spl.c
@@ -6,9 +6,13 @@
#include <common.h>
#include <spl.h>
+#include <i2c.h>
#include <asm/arch/clock.h>
#include <asm/arch/ddr_defs.h>
#include <asm/gpio.h>
+#include <power/pmic.h>
+#include <power/tps65218.h>
+#include "board.h"
DECLARE_GLOBAL_DATA_PTR;
@@ -100,6 +104,17 @@
return &dpll_per;
}
+void scale_vcores(void)
+{
+ set_i2c_pin_mux();
+ i2c_init(CONFIG_SYS_OMAP24_I2C_SPEED, CONFIG_SYS_OMAP24_I2C_SLAVE);
+ if (i2c_probe(TPS65218_CHIP_PM))
+ return;
+
+ tps65218_voltage_update(TPS65218_DCDC1, TPS65218_DCDC_VOLT_SEL_1100MV);
+ tps65218_voltage_update(TPS65218_DCDC2, TPS65218_DCDC_VOLT_SEL_1100MV);
+}
+
void sdram_init(void)
{
unsigned long ram_size;
diff --git a/include/configs/cm_t43.h b/include/configs/cm_t43.h
index 3bc3336..329a5ea 100644
--- a/include/configs/cm_t43.h
+++ b/include/configs/cm_t43.h
@@ -167,5 +167,7 @@
#define CONFIG_SPL_SPI_SUPPORT
#define CONFIG_SPL_SPI_FLASH_SUPPORT
#define CONFIG_SPL_SPI_LOAD
+#define CONFIG_SPL_I2C_SUPPORT
+#define CONFIG_SPL_POWER_SUPPORT
#endif /* __CONFIG_CM_T43_H */