[PATCH] regulator: add regulator_get_linear_step() stub helper

[Arnd Bergmann]

The regulator header has empty inline functions for most interfaces,
but not regulator_get_linear_step(), which has just grown a user
that does not depend on regulators otherwise:

drivers/clk/tegra/clk-tegra124-dfll-fcpu.c: In function 'get_alignment_from_regulator':
drivers/clk/tegra/clk-tegra124-dfll-fcpu.c:555:19: error: implicit declaration of function 'regulator_get_linear_step'; did you mean 'regulator_get_drvdata'? [-Werror=implicit-function-declaration]
  align->step_uv = regulator_get_linear_step(reg);
                   ^~~~~~~~~~~~~~~~~~~~~~~~~
                   regulator_get_drvdata
cc1: all warnings being treated as errors
scripts/Makefile.build:278: recipe for target 'drivers/clk/tegra/clk-tegra124-dfll-fcpu.o' failed

Add the missing stub along the others.

Fixes: b3cf8d069505 ("clk: tegra: dfll: CVB calculation alignment with the regulator")
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
---
 include/linux/regulator/consumer.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/linux/regulator/consumer.h b/include/linux/regulator/consumer.h
index f3f76051e8b0..aaf3cee70439 100644
--- a/include/linux/regulator/consumer.h
+++ b/include/linux/regulator/consumer.h
@@ -478,6 +478,11 @@ static inline int regulator_is_supported_voltage(struct regulator *regulator,
 	return 0;
 }
 
+static inline unsigned int regulator_get_linear_step(struct regulator *regulator)
+{
+	return 0;
+}
+
 static inline int regulator_set_current_limit(struct regulator *regulator,
 					     int min_uA, int max_uA)
 {
-- 
2.20.0