regulator: new API for voltage reference supplies

Merge series from David Lechner <dlechner@baylibre.com>:

In the IIO subsystem, we noticed a pattern in many drivers where we need
to get, enable and get the voltage of a supply that provides a reference
voltage. In these cases, we only need the voltage and not a handle to
the regulator. Another common pattern is for chips to have an internal
reference voltage that is used when an external reference is not
available. There are also a few drivers outside of IIO that do the same.

So we would like to propose a new regulator consumer API to handle these
specific cases to avoid repeating the same boilerplate code in multiple
drivers.

As an example of how these functions are used, I have included a few
patches to consumer drivers. But to avoid a giant patch bomb, I have
omitted the iio/adc and iio/dac patches I have prepared from this
series. I will send those separately but these will add 36 more users
of devm_regulator_get_enable_read_voltage() in addition to the 6 here.
In total, this will eliminate nearly 1000 lines of similar code and will
simplify writing and reviewing new drivers in the future.

1 files changed, 2 insertions, 2 deletions

diff --git a/scripts/bpf_doc.py b/scripts/bpf_doc.py
index 4606944984ee..c55878bddfdd 100755
--- a/scripts/bpf_doc.py
+++ b/scripts/bpf_doc.py
@@ -414,8 +414,8 @@ class PrinterRST(Printer):
             version = version.stdout.decode().rstrip()
         except:
             try:
-                version = subprocess.run(['make', 'kernelversion'], cwd=linuxRoot,
-                                         capture_output=True, check=True)
+                version = subprocess.run(['make', '-s', '--no-print-directory', 'kernelversion'],
+                                         cwd=linuxRoot, capture_output=True, check=True)
                 version = version.stdout.decode().rstrip()
             except:
                 return 'Linux'