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authorMatti Vaittinen <matti.vaittinen@fi.rohmeurope.com>2020-05-08 18:39:35 +0300
committerMark Brown <broonie@kernel.org>2020-05-08 20:18:11 +0300
commitd2218d4e4a65f25bd2d38489567012c7db50233c (patch)
treeea4e5ca04f11962d1609c98cea9a1b71d5e0f918 /lib/Kconfig
parent0e698dfa282211e414076f9dc7e83c1c288314fd (diff)
downloadlinux-d2218d4e4a65f25bd2d38489567012c7db50233c.tar.xz
lib: add linear ranges helpers
Many devices have control registers which control some measurable property. Often a register contains control field so that change in this field causes linear change in the controlled property. It is not a rare case that user wants to give 'meaningful' control values and driver needs to convert them to register field values. Even more often user wants to 'see' the currently set value - again in meaningful units - and driver needs to convert the values it reads from register to these meaningful units. Examples of this include: - regulators, voltage/current configurations - power, voltage/current configurations - clk(?) NCOs and maybe others I can't think of right now. Provide a linear_range helper which can do conversion from user value to register value 'selector'. The idea here is stolen from regulator framework and patches refactoring the regulator helpers to use this are following. Current implementation does not support inversely proportional ranges but it might be useful if we could support also inversely proportional ranges? Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com> Reviewed-by: Mark Brown <broonie@kernel.org> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/59259bc475e0c800eb4bb163f02528c7c01f7b3a.1588944082.git.matti.vaittinen@fi.rohmeurope.com Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'lib/Kconfig')
-rw-r--r--lib/Kconfig3
1 files changed, 3 insertions, 0 deletions
diff --git a/lib/Kconfig b/lib/Kconfig
index 5d53f9609c25..8ec05335426c 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -19,6 +19,9 @@ config RAID6_PQ_BENCHMARK
Benchmark all available RAID6 PQ functions on init and choose the
fastest one.
+config LINEAR_RANGES
+ tristate
+
config PACKING
bool "Generic bitfield packing and unpacking"
default n