regulator: s2mpa01: Fix accidental enable of buck4 ramp delay

commit 51e2fc0a251ba64c68207e4c6f6ac33c891b2465 upstream.

S2MPA01 supports enabling/disabling ramp delay only for buck[1234].
Other bucks have ramp delay enabled always.

However the bit shift for enabling buck4 ramp delay in register is equal
to 0. When ramp delay was set for the bucks unsupporting enable/disable
(buck[56789] and buck10), the ramp delay for buck4 was also enabled.

Fixes: f7b1a8dc1c1c ("regulator: s2mpa01: Don't check enable_shift before setting enable ramp rate")
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Reviewed-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/regulator/s2mpa01.c b/drivers/regulator/s2mpa01.c
index a52cb1cec5765a964986f33579eb2f1bb7fc6b5b..fdd68dd6904938a87a4122b00ec1bf3e11a02f8c 100644 (file)
--- a/drivers/regulator/s2mpa01.c
+++ b/drivers/regulator/s2mpa01.c
@@ -191,11 +191,15 @@ static int s2mpa01_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
        if (!ramp_enable)
                goto ramp_disable;
 
-       ret = regmap_update_bits(rdev->regmap, S2MPA01_REG_RAMP1,
-                                1 << enable_shift, 1 << enable_shift);
-       if (ret) {
-               dev_err(&rdev->dev, "failed to enable ramp rate\n");
-               return ret;
+       /* Ramp delay can be enabled/disabled only for buck[1234] */
+       if (rdev_get_id(rdev) >= S2MPA01_BUCK1 &&
+                       rdev_get_id(rdev) <= S2MPA01_BUCK4) {
+               ret = regmap_update_bits(rdev->regmap, S2MPA01_REG_RAMP1,
+                                        1 << enable_shift, 1 << enable_shift);
+               if (ret) {
+                       dev_err(&rdev->dev, "failed to enable ramp rate\n");
+                       return ret;
+               }
        }
 
        ramp_val = get_ramp_delay(ramp_delay);