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authorKrzysztof Kozlowski <k.kozlowski@samsung.com>2016-04-18 16:33:10 +0300
committerMark Brown <broonie@kernel.org>2016-04-18 19:31:38 +0300
commit94be46b9e5e2954b6d5962750f8aae8b5f099baa (patch)
tree79a31cee1c71ad8fa1da36ed66b4be5f413c862f /include/linux/mfd/samsung
parent5ab3c4949580a18e86b0bedd7b7b21c708192b91 (diff)
downloadlinux-94be46b9e5e2954b6d5962750f8aae8b5f099baa.tar.xz
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 'include/linux/mfd/samsung')
-rw-r--r--include/linux/mfd/samsung/core.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/mfd/samsung/core.h b/include/linux/mfd/samsung/core.h
index 6bc4bcd488ac..5a23dd4df432 100644
--- a/include/linux/mfd/samsung/core.h
+++ b/include/linux/mfd/samsung/core.h
@@ -30,6 +30,9 @@
#define MIN_600_MV 600000
#define MIN_500_MV 500000
+/* Ramp delay in uV/us */
+#define RAMP_DELAY_12_MVUS 12000
+
/* Macros to represent steps for LDO/BUCK */
#define STEP_50_MV 50000
#define STEP_25_MV 25000