drivers/power/pmic/pmic_tps65910.c

   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 }