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authorKrzysztof Kozlowski <k.kozlowski@samsung.com>2016-04-18 15:33:10 +0200
committerMark Brown <broonie@kernel.org>2016-04-18 17:31:38 +0100
commit94be46b9e5e2954b6d5962750f8aae8b5f099baa (patch)
tree79a31cee1c71ad8fa1da36ed66b4be5f413c862f /drivers/regulator/s2mps11.c
parent5ab3c4949580a18e86b0bedd7b7b21c708192b91 (diff)
downloadlinux-94be46b9e5e2954b6d5962750f8aae8b5f099baa.tar.bz2
regulator: s2mps11: Set default ramp delay for S2MPS11 LDOs
Driver did not provide default value for ramp delay for LDOs which lead to warning in dmesg, e.g. on Odroid XU4: [ 1.486076] vdd_ldo9: ramp_delay not set [ 1.506875] vddq_mmc2: ramp_delay not set [ 1.523766] vdd_ldo15: ramp_delay not set [ 1.544702] vdd_sd: ramp_delay not set The datasheet for all the S2MPS1x family is inconsistent here and does not specify unambiguously the value of ramp delay for LDO. It mentions 30 mV/us in one timing diagram but then omits it completely in LDO regulator characteristics table (it is specified for bucks). However the vendor kernels for Galaxy S5 and Odroid XU3 use values of 12 mV/us or 24 mV/us. Without the ramp delay value the consumers do not wait for voltage settle after changing it. Although the proper value of ramp delay for LDOs is unknown, it seems safer to use at least some value from reference kernel than to leave it unset. Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/regulator/s2mps11.c')
-rw-r--r--drivers/regulator/s2mps11.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/regulator/s2mps11.c b/drivers/regulator/s2mps11.c
index 46e5a2922c4d..47c7de8f39e9 100644
--- a/drivers/regulator/s2mps11.c
+++ b/drivers/regulator/s2mps11.c
@@ -267,6 +267,7 @@ static struct regulator_ops s2mps11_buck_ops = {
.ops = &s2mps11_ldo_ops, \
.type = REGULATOR_VOLTAGE, \
.owner = THIS_MODULE, \
+ .ramp_delay = RAMP_DELAY_12_MVUS, \
.min_uV = MIN_800_MV, \
.uV_step = step, \
.n_voltages = S2MPS11_LDO_N_VOLTAGES, \