drivers/power/pmic/pmic_tps65910.c

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