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counter: 104-quad-8: Migrate to the regmap API

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The regmap API supports IO port accessors so we can take advantage of
regmap abstractions rather than handling access to the device registers
directly in the driver. With regmap we get boundary checks, read-write
permissions, operation synchronization locks, and more for free. Most
important of all, rather than rolling our own we utilize implementations
that are known to work and gain from any future improvements and fixes
that come.

Suggested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/1f1f7920d2be94aedb6fdf49f429fe6137c8cb24.1681753140.git.william.gray@linaro.org/
Signed-off-by: William Breathitt Gray <william.gray@linaro.org>
This commit is contained in:
William Breathitt Gray
2023-05-18 20:39:46 -04:00
parent 142c8622b5
commit 98ffe02529
2 changed files with 227 additions and 135 deletions
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drivers/counter/104-quad-8.c
+226 -135
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drivers/counter/Kconfig
+1
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@@ -16,6 +16,7 @@ config 104_QUAD_8
tristate "ACCES 104-QUAD-8 driver"
depends on (PC104 && X86) || COMPILE_TEST
select ISA_BUS_API
select REGMAP_MMIO
help
Say yes here to build support for the ACCES 104-QUAD-8 quadrature
encoder counter/interface device family (104-QUAD-8, 104-QUAD-4).