target/linux/at91/patches-5.15/125-regulator-mcp16502-add-support-for-ramp-delay.patch

   1 From 7f13433e11a3c88f1fd6417c4c5e5a6c98370b9a Mon Sep 17 00:00:00 2001
   2 From: Claudiu Beznea <claudiu.beznea@microchip.com>
   3 Date: Fri, 13 Nov 2020 17:21:09 +0200
   4 Subject: [PATCH 125/247] regulator: mcp16502: add support for ramp delay
   5
   6 MCP16502 have configurable ramp delay support (via DVSR bits in
   7 regulators' CFG register).
   8
   9 Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
  10 Link: https://lore.kernel.org/r/1605280870-32432-6-git-send-email-claudiu.beznea@microchip.com
  11 Signed-off-by: Mark Brown <broonie@kernel.org>
  12 ---
  13  drivers/regulator/mcp16502.c | 89 +++++++++++++++++++++++++++++++++++-
  14  1 file changed, 87 insertions(+), 2 deletions(-)
  15
  16 --- a/drivers/regulator/mcp16502.c
  17 +++ b/drivers/regulator/mcp16502.c
  18 @@ -22,8 +22,9 @@
  19  #define VDD_LOW_SEL 0x0D
  20  #define VDD_HIGH_SEL 0x3F
  21
  22 -#define MCP16502_FLT BIT(7)
  23 -#define MCP16502_ENS BIT(0)
  24 +#define MCP16502_FLT           BIT(7)
  25 +#define MCP16502_DVSR          GENMASK(3, 2)
  26 +#define MCP16502_ENS           BIT(0)
  27
  28  /*
  29   * The PMIC has four sets of registers corresponding to four power modes:
  30 @@ -88,6 +89,12 @@ enum mcp16502_reg {
  31         MCP16502_REG_CFG,
  32  };
  33
  34 +/* Ramp delay (uV/us) for buck1, ldo1, ldo2. */
  35 +static const int mcp16502_ramp_b1l12[] = { 6250, 3125, 2083, 1563 };
  36 +
  37 +/* Ramp delay (uV/us) for buck2, buck3, buck4. */
  38 +static const int mcp16502_ramp_b234[] = { 3125, 1563, 1042, 781 };
  39 +
  40  static unsigned int mcp16502_of_map_mode(unsigned int mode)
  41  {
  42         if (mode == REGULATOR_MODE_NORMAL || mode == REGULATOR_MODE_IDLE)
  43 @@ -271,6 +278,80 @@ static int mcp16502_get_status(struct re
  44         return REGULATOR_STATUS_UNDEFINED;
  45  }
  46
  47 +static int mcp16502_set_voltage_time_sel(struct regulator_dev *rdev,
  48 +                                        unsigned int old_sel,
  49 +                                        unsigned int new_sel)
  50 +{
  51 +       static const u8 us_ramp[] = { 8, 16, 24, 32 };
  52 +       int id = rdev_get_id(rdev);
  53 +       unsigned int uV_delta, val;
  54 +       int ret;
  55 +
  56 +       ret = regmap_read(rdev->regmap, MCP16502_REG_BASE(id, CFG), &val);
  57 +       if (ret)
  58 +               return ret;
  59 +
  60 +       val = (val & MCP16502_DVSR) >> 2;
  61 +       uV_delta = abs(new_sel * rdev->desc->linear_ranges->step -
  62 +                      old_sel * rdev->desc->linear_ranges->step);
  63 +       switch (id) {
  64 +       case BUCK1:
  65 +       case LDO1:
  66 +       case LDO2:
  67 +               ret = DIV_ROUND_CLOSEST(uV_delta * us_ramp[val],
  68 +                                       mcp16502_ramp_b1l12[val]);
  69 +               break;
  70 +
  71 +       case BUCK2:
  72 +       case BUCK3:
  73 +       case BUCK4:
  74 +               ret = DIV_ROUND_CLOSEST(uV_delta * us_ramp[val],
  75 +                                       mcp16502_ramp_b234[val]);
  76 +               break;
  77 +
  78 +       default:
  79 +               return -EINVAL;
  80 +       }
  81 +
  82 +       return ret;
  83 +}
  84 +
  85 +static int mcp16502_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
  86 +{
  87 +       const int *ramp;
  88 +       int id = rdev_get_id(rdev);
  89 +       unsigned int i, size;
  90 +
  91 +       switch (id) {
  92 +       case BUCK1:
  93 +       case LDO1:
  94 +       case LDO2:
  95 +               ramp = mcp16502_ramp_b1l12;
  96 +               size = ARRAY_SIZE(mcp16502_ramp_b1l12);
  97 +               break;
  98 +
  99 +       case BUCK2:
 100 +       case BUCK3:
 101 +       case BUCK4:
 102 +               ramp = mcp16502_ramp_b234;
 103 +               size = ARRAY_SIZE(mcp16502_ramp_b234);
 104 +               break;
 105 +
 106 +       default:
 107 +               return -EINVAL;
 108 +       }
 109 +
 110 +       for (i = 0; i < size; i++) {
 111 +               if (ramp[i] == ramp_delay)
 112 +                       break;
 113 +       }
 114 +       if (i == size)
 115 +               return -EINVAL;
 116 +
 117 +       return regmap_update_bits(rdev->regmap, MCP16502_REG_BASE(id, CFG),
 118 +                                 MCP16502_DVSR, (i << 2));
 119 +}
 120 +
 121  #ifdef CONFIG_SUSPEND
 122  /*
 123   * mcp16502_suspend_get_target_reg() - get the reg of the target suspend PMIC
 124 @@ -365,6 +446,8 @@ static const struct regulator_ops mcp165
 125         .disable                        = regulator_disable_regmap,
 126         .is_enabled                     = regulator_is_enabled_regmap,
 127         .get_status                     = mcp16502_get_status,
 128 +       .set_voltage_time_sel           = mcp16502_set_voltage_time_sel,
 129 +       .set_ramp_delay                 = mcp16502_set_ramp_delay,
 130
 131         .set_mode                       = mcp16502_set_mode,
 132         .get_mode                       = mcp16502_get_mode,
 133 @@ -389,6 +472,8 @@ static const struct regulator_ops mcp165
 134         .disable                        = regulator_disable_regmap,
 135         .is_enabled                     = regulator_is_enabled_regmap,
 136         .get_status                     = mcp16502_get_status,
 137 +       .set_voltage_time_sel           = mcp16502_set_voltage_time_sel,
 138 +       .set_ramp_delay                 = mcp16502_set_ramp_delay,
 139
 140  #ifdef CONFIG_SUSPEND
 141         .set_suspend_voltage            = mcp16502_set_suspend_voltage,