[U-Boot] [PATCH 4/4] arm:am43xx: Add TPS65218 support to scale voltages up

[Tom Rini]

This family is supported by the TPS65218 PMIC.  Implement a scale_vcores
to set the MPU and CORE voltage correctly to the max frequency that is
supported (and what we will be scaling them to in setup_dplls()).

Signed-off-by: Tom Rini <trini at ti.com>
---
 board/ti/am43xx/board.c      |   48 ++++++++++++++++++++++++++++++++++++------
 include/configs/am43xx_evm.h |    4 ++++
 2 files changed, 45 insertions(+), 7 deletions(-)

diff --git a/board/ti/am43xx/board.c b/board/ti/am43xx/board.c
index e05a50b..7786903 100644
--- a/board/ti/am43xx/board.c
+++ b/board/ti/am43xx/board.c
@@ -19,6 +19,7 @@
 #include <asm/arch/gpio.h>
 #include <asm/emif.h>
 #include "board.h"
+#include <power/tps65218.h>
 #include <miiphy.h>
 #include <cpsw.h>
 
@@ -416,13 +417,6 @@ void emif_get_ext_phy_ctrl_const_regs(const u32 **regs, u32 *size)
 
 const struct dpll_params *get_dpll_ddr_params(void)
 {
-	struct am43xx_board_id header;
-
-	enable_i2c0_pin_mux();
-	i2c_init(CONFIG_SYS_OMAP24_I2C_SPEED, CONFIG_SYS_OMAP24_I2C_SLAVE);
-	if (read_eeprom(&header) < 0)
-		puts("Could not get board ID.\n");
-
 	if (board_is_eposevm())
 		return &epos_evm_dpll_ddr;
 	else if (board_is_gpevm() || board_is_sk())
@@ -500,6 +494,46 @@ const struct dpll_params *get_dpll_per_params(void)
 	return &dpll_per[ind];
 }
 
+void scale_vcores(void)
+{
+	const struct dpll_params *mpu_params;
+	int mpu_vdd;
+	struct am43xx_board_id header;
+
+	enable_i2c0_pin_mux();
+	i2c_init(CONFIG_SYS_OMAP24_I2C_SPEED, CONFIG_SYS_OMAP24_I2C_SLAVE);
+	if (read_eeprom(&header) < 0)
+		puts("Could not get board ID.\n");
+
+	/* Get the frequency */
+	mpu_params = get_dpll_mpu_params();
+
+	if (i2c_probe(TPS65218_CHIP_PM))
+		return;
+
+	if (mpu_params->m == 1000) {
+		mpu_vdd = TPS65218_DCDC_VOLT_SEL_1330MV;
+	} else if (mpu_params->m == 600) {
+		mpu_vdd = TPS65218_DCDC_VOLT_SEL_1100MV;
+	} else {
+		puts("Unknown MPU clock, not scaling\n");
+		return;
+	}
+
+	/* Set DCDC1 (CORE) voltage to 1.1V */
+	if (tps65218_voltage_update(TPS65218_DCDC1,
+				    TPS65218_DCDC_VOLT_SEL_1100MV)) {
+		puts("tps65218_voltage_update failure\n");
+		return;
+	}
+
+	/* Set DCDC2 (MPU) voltage */
+	if (tps65218_voltage_update(TPS65218_DCDC2, mpu_vdd)) {
+		puts("tps65218_voltage_update failure\n");
+		return;
+	}
+}
+
 void set_uart_mux_conf(void)
 {
 	enable_uart0_pin_mux();
diff --git a/include/configs/am43xx_evm.h b/include/configs/am43xx_evm.h
index 470fa39..2e19c17 100644
--- a/include/configs/am43xx_evm.h
+++ b/include/configs/am43xx_evm.h
@@ -32,11 +32,15 @@
 #define CONFIG_SYS_I2C_EEPROM_ADDR_LEN	2
 #define CONFIG_SYS_I2C_MULTI_EEPROMS
 
+/* Power */
+#define CONFIG_POWER_TPS65218
+
 /* SPL defines. */
 #define CONFIG_SPL_TEXT_BASE		0x40300350
 #define CONFIG_SPL_MAX_SIZE		(220 << 10)	/* 220KB */
 #define CONFIG_SYS_SPL_ARGS_ADDR	(CONFIG_SYS_SDRAM_BASE + \
 					 (128 << 20))
+#define CONFIG_SPL_POWER_SUPPORT
 #define CONFIG_SPL_YMODEM_SUPPORT
 
 /* Enabling L2 Cache */
-- 
1.7.9.5