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regulator: palmas: Fix calculating selector in palmas_map_voltage_ldo
This patch fixes below issues when choosing selector: 1. Current code returns negative selector if min_uV < 900000 which is wrong. For example, it is possible to satisfy the request with selector = 1 if the requested min_uV is 850000. 2. Current code may select a voltage lower than requested min_uV. For example, if the requested min_uV is 945000, current code chooses selector = 1 which is lower than requested min_uV. DIV_ROUND_UP to avoid this case. Signed-off-by: Axel Lin <axel.lin@gmail.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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@ -486,9 +486,12 @@ static int palmas_map_voltage_ldo(struct regulator_dev *rdev,
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{
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int ret, voltage;
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ret = ((min_uV - 900000) / 50000) + 1;
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if (ret < 0)
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return ret;
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if (min_uV == 0)
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return 0;
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if (min_uV < 900000)
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min_uV = 900000;
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ret = DIV_ROUND_UP(min_uV - 900000, 50000) + 1;
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/* Map back into a voltage to verify we're still in bounds */
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voltage = palmas_list_voltage_ldo(rdev, ret);
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