drivers/regulator/rohm-regulator.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 // Copyright (C) 2020 ROHM Semiconductors
   3
   4 #include <linux/errno.h>
   5 #include <linux/mfd/rohm-generic.h>
   6 #include <linux/module.h>
   7 #include <linux/of.h>
   8 #include <linux/regmap.h>
   9 #include <linux/regulator/driver.h>
  10
  11 static int set_dvs_level(const struct regulator_desc *desc,
  12                          struct device_node *np, struct regmap *regmap,
  13                          char *prop, unsigned int reg, unsigned int mask,
  14                          unsigned int omask, unsigned int oreg)
  15 {
  16         int ret, i;
  17         uint32_t uv;
  18
  19         ret = of_property_read_u32(np, prop, &uv);
  20         if (ret) {
  21                 if (ret != -EINVAL)
  22                         return ret;
  23                 return 0;
  24         }
  25
  26         if (uv == 0) {
  27                 if (omask)
  28                         return regmap_update_bits(regmap, oreg, omask, 0);
  29         }
  30         for (i = 0; i < desc->n_voltages; i++) {
  31                 ret = regulator_desc_list_voltage_linear_range(desc, i);
  32                 if (ret < 0)
  33                         continue;
  34                 if (ret == uv) {
  35                         i <<= ffs(desc->vsel_mask) - 1;
  36                         ret = regmap_update_bits(regmap, reg, mask, i);
  37                         if (omask && !ret)
  38                                 ret = regmap_update_bits(regmap, oreg, omask,
  39                                                          omask);
  40                         break;
  41                 }
  42         }
  43         return ret;
  44 }
  45
  46 int rohm_regulator_set_dvs_levels(const struct rohm_dvs_config *dvs,
  47                           struct device_node *np,
  48                           const struct regulator_desc *desc,
  49                           struct regmap *regmap)
  50 {
  51         int i, ret = 0;
  52         char *prop;
  53         unsigned int reg, mask, omask, oreg = desc->enable_reg;
  54
  55         for (i = 0; i < ROHM_DVS_LEVEL_VALID_AMOUNT && !ret; i++) {
  56                 int bit;
  57
  58                 bit = BIT(i);
  59                 if (dvs->level_map & bit) {
  60                         switch (bit) {
  61                         case ROHM_DVS_LEVEL_RUN:
  62                                 prop = "rohm,dvs-run-voltage";
  63                                 reg = dvs->run_reg;
  64                                 mask = dvs->run_mask;
  65                                 omask = dvs->run_on_mask;
  66                                 break;
  67                         case ROHM_DVS_LEVEL_IDLE:
  68                                 prop = "rohm,dvs-idle-voltage";
  69                                 reg = dvs->idle_reg;
  70                                 mask = dvs->idle_mask;
  71                                 omask = dvs->idle_on_mask;
  72                                 break;
  73                         case ROHM_DVS_LEVEL_SUSPEND:
  74                                 prop = "rohm,dvs-suspend-voltage";
  75                                 reg = dvs->suspend_reg;
  76                                 mask = dvs->suspend_mask;
  77                                 omask = dvs->suspend_on_mask;
  78                                 break;
  79                         case ROHM_DVS_LEVEL_LPSR:
  80                                 prop = "rohm,dvs-lpsr-voltage";
  81                                 reg = dvs->lpsr_reg;
  82                                 mask = dvs->lpsr_mask;
  83                                 omask = dvs->lpsr_on_mask;
  84                                 break;
  85                         default:
  86                                 return -EINVAL;
  87                         }
  88                         ret = set_dvs_level(desc, np, regmap, prop, reg, mask,
  89                                             omask, oreg);
  90                 }
  91         }
  92         return ret;
  93 }
  94 EXPORT_SYMBOL(rohm_regulator_set_dvs_levels);
  95
  96 MODULE_LICENSE("GPL v2");
  97 MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>");
  98 MODULE_DESCRIPTION("Generic helpers for ROHM PMIC regulator drivers");