1 /* 2 * (C) Copyright 2011-2013 3 * Texas Instruments, <www.ti.com> 4 * 5 * SPDX-License-Identifier: GPL-2.0+ 6 */ 7 8 #include <common.h> 9 #include <i2c.h> 10 #include <power/tps65910.h> 11 12 /* 13 * tps65910_set_i2c_control() - Set the TPS65910 to be controlled via the I2C 14 * interface. 15 * @return: 0 on success, not 0 on failure 16 */ 17 int tps65910_set_i2c_control(void) 18 { 19 int ret; 20 uchar buf; 21 22 /* VDD1/2 voltage selection register access by control i/f */ 23 ret = i2c_read(TPS65910_CTRL_I2C_ADDR, TPS65910_DEVCTRL_REG, 1, 24 &buf, 1); 25 26 if (ret) 27 return ret; 28 29 buf |= TPS65910_DEVCTRL_REG_SR_CTL_I2C_SEL_CTL_I2C; 30 31 return i2c_write(TPS65910_CTRL_I2C_ADDR, TPS65910_DEVCTRL_REG, 1, 32 &buf, 1); 33 } 34 35 /* 36 * tps65910_voltage_update() - Voltage switching for MPU frequency switching. 37 * @module: mpu - 0, core - 1 38 * @vddx_op_vol_sel: vdd voltage to set 39 * @return: 0 on success, not 0 on failure 40 */ 41 int tps65910_voltage_update(unsigned int module, unsigned char vddx_op_vol_sel) 42 { 43 uchar buf; 44 unsigned int reg_offset; 45 int ret; 46 47 if (module == MPU) 48 reg_offset = TPS65910_VDD1_OP_REG; 49 else 50 reg_offset = TPS65910_VDD2_OP_REG; 51 52 /* Select VDDx OP */ 53 ret = i2c_read(TPS65910_CTRL_I2C_ADDR, reg_offset, 1, &buf, 1); 54 if (ret) 55 return ret; 56 57 buf &= ~TPS65910_OP_REG_CMD_MASK; 58 59 ret = i2c_write(TPS65910_CTRL_I2C_ADDR, reg_offset, 1, &buf, 1); 60 if (ret) 61 return ret; 62 63 /* Configure VDDx OP Voltage */ 64 ret = i2c_read(TPS65910_CTRL_I2C_ADDR, reg_offset, 1, &buf, 1); 65 if (ret) 66 return ret; 67 68 buf &= ~TPS65910_OP_REG_SEL_MASK; 69 buf |= vddx_op_vol_sel; 70 71 ret = i2c_write(TPS65910_CTRL_I2C_ADDR, reg_offset, 1, &buf, 1); 72 if (ret) 73 return ret; 74 75 ret = i2c_read(TPS65910_CTRL_I2C_ADDR, reg_offset, 1, &buf, 1); 76 if (ret) 77 return ret; 78 79 if ((buf & TPS65910_OP_REG_SEL_MASK) != vddx_op_vol_sel) 80 return 1; 81 82 return 0; 83 } 84