drivers/power/pmic: Add tps65910 driver

Add a driver for the TPS65910 PMIC that is found in the AM335x GP EVM,
AM335x EVM SK and others.

Signed-off-by: Philip, Avinash <avinashphilip@ti.com>
[trini: Split and rework Avinash's changes into new drivers/power
framework]
Signed-off-by: Tom Rini <trini@ti.com>

drivers/power/pmic/Makefile

@@ -14,6 +14,7 @@ COBJS-$(CONFIG_POWER_MAX8997) += pmic_max8997.o
 COBJS-$(CONFIG_POWER_MUIC_MAX8997) += muic_max8997.o
 COBJS-$(CONFIG_POWER_MAX77686) += pmic_max77686.o
 COBJS-$(CONFIG_POWER_TPS65217) += pmic_tps65217.o
+COBJS-$(CONFIG_POWER_TPS65910) += pmic_tps65910.o
 
 COBJS	:= $(COBJS-y)
 SRCS	:= $(COBJS:.o=.c)

drivers/power/pmic/pmic_tps65910.c

@@ -0,0 +1,83 @@
+/*
+ * (C) Copyright 2011-2013
+ * Texas Instruments, <www.ti.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <i2c.h>
+#include <power/tps65910.h>
+
+/*
+ * tps65910_set_i2c_control() - Set the TPS65910 to be controlled via the I2C
+ * 				interface.
+ * @return:		       0 on success, not 0 on failure
+ */
+int tps65910_set_i2c_control(void)
+{
+	int ret;
+	uchar buf;
+
+	/* VDD1/2 voltage selection register access by control i/f */
+	ret = i2c_read(TPS65910_CTRL_I2C_ADDR, TPS65910_DEVCTRL_REG, 1,
+		       &buf, 1);
+
+	if (ret)
+		return ret;
+
+	buf |= TPS65910_DEVCTRL_REG_SR_CTL_I2C_SEL_CTL_I2C;
+
+	return i2c_write(TPS65910_CTRL_I2C_ADDR, TPS65910_DEVCTRL_REG, 1,
+			 &buf, 1);
+}
+
+/*
+ * tps65910_voltage_update() - Voltage switching for MPU frequency switching.
+ * @module:		       mpu - 0, core - 1
+ * @vddx_op_vol_sel:	       vdd voltage to set
+ * @return:		       0 on success, not 0 on failure
+ */
+int tps65910_voltage_update(unsigned int module, unsigned char vddx_op_vol_sel)
+{
+	uchar buf;
+	unsigned int reg_offset;
+	int ret;
+
+	if (module == MPU)
+		reg_offset = TPS65910_VDD1_OP_REG;
+	else
+		reg_offset = TPS65910_VDD2_OP_REG;
+
+	/* Select VDDx OP   */
+	ret = i2c_read(TPS65910_CTRL_I2C_ADDR, reg_offset, 1, &buf, 1);
+	if (ret)
+		return ret;
+
+	buf &= ~TPS65910_OP_REG_CMD_MASK;
+
+	ret = i2c_write(TPS65910_CTRL_I2C_ADDR, reg_offset, 1, &buf, 1);
+	if (ret)
+		return ret;
+
+	/* Configure VDDx OP  Voltage */
+	ret = i2c_read(TPS65910_CTRL_I2C_ADDR, reg_offset, 1, &buf, 1);
+	if (ret)
+		return ret;
+
+	buf &= ~TPS65910_OP_REG_SEL_MASK;
+	buf |= vddx_op_vol_sel;
+
+	ret = i2c_write(TPS65910_CTRL_I2C_ADDR, reg_offset, 1, &buf, 1);
+	if (ret)
+		return ret;
+
+	ret = i2c_read(TPS65910_CTRL_I2C_ADDR, reg_offset, 1, &buf, 1);
+	if (ret)
+		return ret;
+
+	if ((buf & TPS65910_OP_REG_SEL_MASK) != vddx_op_vol_sel)
+		return 1;
+
+	return 0;
+}

include/power/tps65910.h

@@ -0,0 +1,77 @@
+/*
+ * (C) Copyright 2011-2013
+ * Texas Instruments, <www.ti.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ *
+ * For more details, please see the TRM at http://www.ti.com/product/tps65910
+ */
+#ifndef __POWER_TPS65910_H__
+#define __POWER_TPS65910_H__
+
+#define MPU     0
+#define CORE    1
+
+#define TPS65910_SR_I2C_ADDR				0x12
+#define TPS65910_CTRL_I2C_ADDR				0x2D
+
+/* PMIC Register offsets */
+enum {
+	TPS65910_VDD1_REG				= 0x21,
+	TPS65910_VDD1_OP_REG				= 0x22,
+	TPS65910_VDD2_REG				= 0x24,
+	TPS65910_VDD2_OP_REG				= 0x25,
+	TPS65910_DEVCTRL_REG				= 0x3F,
+};
+
+/* VDD2 & VDD1 control register (VDD2_REG & VDD1_REG) */
+#define TPS65910_VGAIN_SEL_MASK				(0x3 << 6)
+#define TPS65910_ILMAX_MASK				(0x1 << 5)
+#define TPS65910_TSTEP_MASK				(0x7 << 2)
+#define TPS65910_ST_MASK				(0x3)
+
+#define TPS65910_REG_VGAIN_SEL_X1			(0x0 << 6)
+#define TPS65910_REG_VGAIN_SEL_X1_0			(0x1 << 6)
+#define TPS65910_REG_VGAIN_SEL_X3			(0x2 << 6)
+#define TPS65910_REG_VGAIN_SEL_X4			(0x3 << 6)
+
+#define TPS65910_REG_ILMAX_1_0_A			(0x0 << 5)
+#define TPS65910_REG_ILMAX_1_5_A			(0x1 << 5)
+
+#define TPS65910_REG_TSTEP_				(0x0 << 2)
+#define TPS65910_REG_TSTEP_12_5				(0x1 << 2)
+#define TPS65910_REG_TSTEP_9_4				(0x2 << 2)
+#define TPS65910_REG_TSTEP_7_5				(0x3 << 2)
+#define TPS65910_REG_TSTEP_6_25				(0x4 << 2)
+#define TPS65910_REG_TSTEP_4_7				(0x5 << 2)
+#define TPS65910_REG_TSTEP_3_12				(0x6 << 2)
+#define TPS65910_REG_TSTEP_2_5				(0x7 << 2)
+
+#define TPS65910_REG_ST_OFF				(0x0)
+#define TPS65910_REG_ST_ON_HI_POW			(0x1)
+#define TPS65910_REG_ST_OFF_1				(0x2)
+#define TPS65910_REG_ST_ON_LOW_POW			(0x3)
+
+
+/* VDD2 & VDD1 voltage selection register. (VDD2_OP_REG & VDD1_OP_REG) */
+#define TPS65910_OP_REG_SEL				(0x7F)
+
+#define TPS65910_OP_REG_CMD_MASK			(0x1 << 7)
+#define TPS65910_OP_REG_CMD_OP				(0x0 << 7)
+#define TPS65910_OP_REG_CMD_SR				(0x1 << 7)
+
+#define TPS65910_OP_REG_SEL_MASK			(0x7F)
+#define TPS65910_OP_REG_SEL_0_9_5			(0x1F)	/* 0.9500 V */
+#define TPS65910_OP_REG_SEL_1_1_3			(0x2E)	/* 1.1375 V */
+#define TPS65910_OP_REG_SEL_1_2_0			(0x33)	/* 1.2000 V */
+#define TPS65910_OP_REG_SEL_1_2_6			(0x38)	/* 1.2625 V */
+#define TPS65910_OP_REG_SEL_1_3_2_5			(0x3D)	/* 1.3250 V */
+
+/* Device control register . (DEVCTRL_REG) */
+#define TPS65910_DEVCTRL_REG_SR_CTL_I2C_MASK		(0x1 << 4)
+#define TPS65910_DEVCTRL_REG_SR_CTL_I2C_SEL_SR_I2C	(0x0 << 4)
+#define TPS65910_DEVCTRL_REG_SR_CTL_I2C_SEL_CTL_I2C	(0x1 << 4)
+
+int tps65910_set_i2c_control(void);
+int tps65910_voltage_update(unsigned int module, unsigned char vddx_op_vol_sel);
+#endif	/* __POWER_TPS65910_H__ */