linux-kernel - Re: [PATCH] regulator: rt6160: Convert to use regulator_set_ramp_delay

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Date:   Thu, 3 Jun 2021 10:20:41 +0000
From:   cy_huang(黃啟原) <cy_huang@...htek.com>
To:     "axel.lin@...ics.com" <axel.lin@...ics.com>,
        "broonie@...nel.org" <broonie@...nel.org>
CC:     "lgirdwood@...il.com" <lgirdwood@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] regulator: rt6160: Convert to use
 regulator_set_ramp_delay_regmap

Hi, Axel:> Use regulator_set_ramp_delay_regmap instead of open-coded.
>
There's some reason.
You can refer to https://lkml.org/lkml/2021/6/1/1145.

It's because our ramp value order is from small to large, not large to small.
It conflicts with find_closest_bigger value chosen logic.

That's why I need hard-coded for my ramp value selection.
> Signed-off-by: Axel Lin <axel.lin@...ics.com>
> ---
>  drivers/regulator/rt6160-regulator.c | 35 +++++++---------------------
>  1 file changed, 9 insertions(+), 26 deletions(-)
>
> diff --git a/drivers/regulator/rt6160-regulator.c b/drivers/regulator/rt6160-
> regulator.c
> index 4588ae0748a5..69550284083d 100644
> --- a/drivers/regulator/rt6160-regulator.c
> +++ b/drivers/regulator/rt6160-regulator.c
> @@ -46,6 +46,10 @@ struct rt6160_priv {
>  bool enable_state;
>  };
>
> +static const unsigned int rt6160_ramp_tables[] = {
> +1000, 2500, 5000, 10000
> +};
> +
>  static int rt6160_enable(struct regulator_dev *rdev)
>  {
>  struct rt6160_priv *priv = rdev_get_drvdata(rdev);
> @@ -140,31 +144,6 @@ static int rt6160_set_suspend_voltage(struct
> regulator_dev *rdev, int uV)
>  return regmap_update_bits(regmap, reg, RT6160_VSEL_MASK, vsel);
>  }
>
> -static int rt6160_set_ramp_delay(struct regulator_dev *rdev, int target)
> -{
> -struct regmap *regmap = rdev_get_regmap(rdev);
> -const int ramp_tables[] = { 1000, 2500, 5000, 10000 };
> -unsigned int i, sel;
> -
> -/* Find closest larger or equal */
> -for (i = 0; i < ARRAY_SIZE(ramp_tables); i++) {
> -sel = i;
> -
> -/* If ramp delay is equal to 0, directly set ramp speed to
> fastest */
> -if (target == 0) {
> -sel = ARRAY_SIZE(ramp_tables) - 1;
> -break;
> -}
> -
> -if (target <= ramp_tables[i])
> -break;
> -}
> -
> -sel <<= ffs(RT6160_RAMPRATE_MASK) - 1;
> -
> -return regmap_update_bits(regmap, RT6160_REG_CNTL,
> RT6160_RAMPRATE_MASK, sel);
> -}
> -
>  static int rt6160_get_error_flags(struct regulator_dev *rdev, unsigned int
> *flags)
>  {
>  struct regmap *regmap = rdev_get_regmap(rdev);
> @@ -203,7 +182,7 @@ static const struct regulator_ops rt6160_regulator_ops = {
>  .set_mode = rt6160_set_mode,
>  .get_mode = rt6160_get_mode,
>  .set_suspend_voltage = rt6160_set_suspend_voltage,
> -.set_ramp_delay = rt6160_set_ramp_delay,
> +.set_ramp_delay = regulator_set_ramp_delay_regmap,
>  .get_error_flags = rt6160_get_error_flags,
>  };
>
> @@ -292,6 +271,10 @@ static int rt6160_probe(struct i2c_client *i2c)
>  priv->desc.vsel_reg = RT6160_REG_VSELH;
>  priv->desc.vsel_mask = RT6160_VSEL_MASK;
>  priv->desc.n_voltages = RT6160_N_VOUTS;
> +priv->desc.ramp_reg = RT6160_REG_CNTL;
> +priv->desc.ramp_mask = RT6160_RAMPRATE_MASK;
> +priv->desc.ramp_delay_table = rt6160_ramp_tables;
> +priv->desc.n_ramp_values = ARRAY_SIZE(rt6160_ramp_tables);
>  priv->desc.of_map_mode = rt6160_of_map_mode;
>  priv->desc.ops = &rt6160_regulator_ops;
>  if (priv->vsel_active_low)
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