[PATCHv2] regulators: Add missing dummy definition for regulator_list_voltage

[Suzuki K. Poulose]

From: "Suzuki K. Poulose" <suzuki.poulose@xxxxxxx>

Fixes a build break when CONFIG_REGULATOR is not selected.

e.g, on linux-next - 07102015:

drivers/clk/tegra/clk-dfll.c: In function âfind_lut_index_for_rateâ:
drivers/clk/tegra/clk-dfll.c:691:3: error: implicit declaration of function âregulator_list_voltageâ [-Werror=implicit-function-declaration]
    if (regulator_list_voltage(td->vdd_reg, td->i2c_lut[i]) == uv)
    ^
   CC      drivers/clocksource/mmio.o
   CC      fs/proc/softirqs.o
cc1: some warnings being treated as errors
make[3]: *** [drivers/clk/tegra/clk-dfll.o] Error 1
make[2]: *** [drivers/clk/tegra] Error 2
make[1]: *** [drivers/clk] Error 2
make[1]: *** Waiting for unfinished jobs....

This should be pushed to 4.2 as we have the issue in 4.2-rc1, just that
nobody uses it without the REGULATOR(yet).

Cc: Mark Brown <broonie@xxxxxxxxxx>
Cc: treding@xxxxxxxxxx
Cc: paul@xxxxxxxxx
Signed-off-by: Suzuki K. Poulose <suzuki.poulose@xxxxxxx>
---
Changes since V1:
 - Return -EINVAL instead of 0
---
 include/linux/regulator/consumer.h |    6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/linux/regulator/consumer.h b/include/linux/regulator/consumer.h
index f8a689e..2ba4a40 100644
--- a/include/linux/regulator/consumer.h
+++ b/include/linux/regulator/consumer.h
@@ -550,6 +550,12 @@ static inline int regulator_count_voltages(struct regulator *regulator)
 {
 	return 0;
 }
+
+static inline int regulator_list_voltage(struct regulator *regulator, unsigned selector)
+{
+	return -EINVAL;
+}
+
 #endif
 
 static inline int regulator_set_voltage_tol(struct regulator *regulator,
-- 
1.7.9.5

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