counter: 104-quad-8: Remove IIO counter ABI

The IIO counter driver has been superseded by the Counter subsystem as
discussed in [1]. This patch removes the IIO counter ABI from the
104-QUAD-8 driver.

[1] https://lore.kernel.org/lkml/20210119104105.000010df@Huawei.com/

Cc: Syed Nayyar Waris <syednwaris@gmail.com>
Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com>
Link: https://lore.kernel.org/r/98a39983d5df761c058a469d1346fd8ffdef8516.1611973018.git.vilhelm.gray@gmail.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Documentation/ABI/testing/sysfs-bus-iio-counter-104-quad-8

-What:		/sys/bus/iio/devices/iio:deviceX/in_count_count_mode_available
-What:		/sys/bus/iio/devices/iio:deviceX/in_count_noise_error_available
-What:		/sys/bus/iio/devices/iio:deviceX/in_count_quadrature_mode_available
-What:		/sys/bus/iio/devices/iio:deviceX/in_index_index_polarity_available
-What:		/sys/bus/iio/devices/iio:deviceX/in_index_synchronous_mode_available
-KernelVersion:	4.10
-Contact:	linux-iio@vger.kernel.org
-Description:
-		This interface is deprecated; please use the Counter subsystem.
-
-		Discrete set of available values for the respective counter
-		configuration are listed in this file.
-
-What:		/sys/bus/iio/devices/iio:deviceX/in_countY_count_mode
-KernelVersion:	4.10
-Contact:	linux-iio@vger.kernel.org
-Description:
-		This interface is deprecated; please use the Counter subsystem.
-
-		Count mode for channel Y. Four count modes are available:
-		normal, range limit, non-recycle, and modulo-n. The preset value
-		for channel Y is used by the count mode where required.
-
-		Normal:
-			Counting is continuous in either direction.
-
-		Range Limit:
-			An upper or lower limit is set, mimicking limit switches
-			in the mechanical counterpart. The upper limit is set to
-			the preset value, while the lower limit is set to 0. The
-			counter freezes at count = preset when counting up, and
-			at count = 0 when counting down. At either of these
-			limits, the counting is resumed only when the count
-			direction is reversed.
-
-		Non-recycle:
-			Counter is disabled whenever a 24-bit count overflow or
-			underflow takes place. The counter is re-enabled when a
-			new count value is loaded to the counter via a preset
-			operation or write to raw.
-
-		Modulo-N:
-			A count boundary is set between 0 and the preset value.
-			The counter is reset to 0 at count = preset when
-			counting up, while the counter is set to the preset
-			value at count = 0 when counting down; the counter does
-			not freeze at the bundary points, but counts
-			continuously throughout.
-
-What:		/sys/bus/iio/devices/iio:deviceX/in_countY_noise_error
-KernelVersion:	4.10
-Contact:	linux-iio@vger.kernel.org
-Description:
-		This interface is deprecated; please use the Counter subsystem.
-
-		Read-only attribute that indicates whether excessive noise is
-		present at the channel Y count inputs in quadrature clock mode;
-		irrelevant in non-quadrature clock mode.
-
-What:		/sys/bus/iio/devices/iio:deviceX/in_countY_preset
-KernelVersion:	4.10
-Contact:	linux-iio@vger.kernel.org
-Description:
-		This interface is deprecated; please use the Counter subsystem.
-
-		If the counter device supports preset registers, the preset
-		count for channel Y is provided by this attribute.
-
-What:		/sys/bus/iio/devices/iio:deviceX/in_countY_quadrature_mode
-KernelVersion:	4.10
-Contact:	linux-iio@vger.kernel.org
-Description:
-		This interface is deprecated; please use the Counter subsystem.
-
-		Configure channel Y counter for non-quadrature or quadrature
-		clock mode. Selecting non-quadrature clock mode will disable
-		synchronous load mode. In quadrature clock mode, the channel Y
-		scale attribute selects the encoder phase division (scale of 1
-		selects full-cycle, scale of 0.5 selects half-cycle, scale of
-		0.25 selects quarter-cycle) processed by the channel Y counter.
-
-		Non-quadrature:
-			The filter and decoder circuit are bypassed. Encoder A
-			input serves as the count input and B as the UP/DOWN
-			direction control input, with B = 1 selecting UP Count
-			mode and B = 0 selecting Down Count mode.
-
-		Quadrature:
-			Encoder A and B inputs are digitally filtered and
-			decoded for UP/DN clock.
-
-What:		/sys/bus/iio/devices/iio:deviceX/in_countY_set_to_preset_on_index
-KernelVersion:	4.10
-Contact:	linux-iio@vger.kernel.org
-Description:
-		This interface is deprecated; please use the Counter subsystem.
-
-		Whether to set channel Y counter with channel Y preset value
-		when channel Y index input is active, or continuously count.
-		Valid attribute values are boolean.
-
-What:		/sys/bus/iio/devices/iio:deviceX/in_indexY_index_polarity
-KernelVersion:	4.10
-Contact:	linux-iio@vger.kernel.org
-Description:
-		This interface is deprecated; please use the Counter subsystem.
-
-		Active level of channel Y index input; irrelevant in
-		non-synchronous load mode.
-
-What:		/sys/bus/iio/devices/iio:deviceX/in_indexY_synchronous_mode
-KernelVersion:	4.10
-Contact:	linux-iio@vger.kernel.org
-Description:
-		This interface is deprecated; please use the Counter subsystem.
-
-		Configure channel Y counter for non-synchronous or synchronous
-		load mode. Synchronous load mode cannot be selected in
-		non-quadrature clock mode.
-
-		Non-synchronous:
-			A logic low level is the active level at this index
-			input. The index function (as enabled via
-			set_to_preset_on_index) is performed directly on the
-			active level of the index input.
-
-		Synchronous:
-			Intended for interfacing with encoder Index output in
-			quadrature clock mode. The active level is configured
-			via index_polarity. The index function (as enabled via
-			set_to_preset_on_index) is performed synchronously with
-			the quadrature clock on the active level of the index
-			input.

MAINTAINERS

@@ -300,7 +300,6 @@ M:	Syed Nayyar Waris <syednwaris@gmail.com>
 L:	linux-iio@vger.kernel.org
 S:	Maintained
 F:	Documentation/ABI/testing/sysfs-bus-counter-104-quad-8
-F:	Documentation/ABI/testing/sysfs-bus-iio-counter-104-quad-8
 F:	drivers/counter/104-quad-8.c
 
 ACCES PCI-IDIO-16 GPIO DRIVER

drivers/counter/Kconfig

@@ -14,7 +14,7 @@ if COUNTER
 
 config 104_QUAD_8
 	tristate "ACCES 104-QUAD-8 driver"
-	depends on PC104 && X86 && IIO
+	depends on PC104 && X86
 	select ISA_BUS_API
 	help
 	  Say yes here to build support for the ACCES 104-QUAD-8 quadrature