[PATCH RFC 1/2] regulator: core: Allow uV_step to be 0 for linearmapping if fixed voltage

From: Axel Lin
Date: Wed Jun 06 2012 - 22:05:41 EST


Fixed voltage is a kind of linear mapping where n_voltages is 1 and uV_step is
0. This change allows [list|map]_voltage_linear to be used for fixed voltage.

Signed-off-by: Axel Lin <axel.lin@xxxxxxxxx>
---
drivers/regulator/core.c | 8 ++++++++
1 file changed, 8 insertions(+)

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 02c1940..876f5fc 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -2070,6 +2070,14 @@ int regulator_map_voltage_linear(struct regulator_dev *rdev,
{
int ret, voltage;

+ /* Allow uV_step to be 0 for fixed voltage */
+ if (rdev->desc->n_voltages == 1 && rdev->desc->uV_step == 0) {
+ if (min_uV <= rdev->desc->min_uV && rdev->desc->min_uV <= max_uV)
+ return 0;
+ else
+ return -EINVAL;
+ }
+
if (!rdev->desc->uV_step) {
BUG_ON(!rdev->desc->uV_step);
return -EINVAL;
--
1.7.9.5



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