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Date:   Tue, 22 May 2018 11:44:13 +0100
From:   Jonathan Cameron <Jonathan.Cameron@huawei.com>
To:     William Breathitt Gray <vilhelm.gray@gmail.com>
CC:     Jonathan Cameron <jic23@kernel.org>, <benjamin.gaignard@st.com>,
        <fabrice.gasnier@st.com>, <linux-iio@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>, <devicetree@vger.kernel.org>,
        <linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH v6 9/9] iio: counter: Remove IIO counter subdirectory
Message-ID: <20180522114413.000006ec@huawei.com>
In-Reply-To: <20180521135828.GD5723@sophia>
References: <cover.1526487615.git.vilhelm.gray@gmail.com>
        <4c335e0eebfbaf6e86f41e0f2864d76993d90b13.1526487615.git.vilhelm.gray@gmail.com>
        <20180520165302.101d37ce@archlinux>
        <20180521135828.GD5723@sophia>
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On Mon, 21 May 2018 09:58:28 -0400
William Breathitt Gray <vilhelm.gray@gmail.com> wrote:

> On Sun, May 20, 2018 at 04:53:02PM +0100, Jonathan Cameron wrote:
> >On Wed, 16 May 2018 13:52:39 -0400
> >William Breathitt Gray <vilhelm.gray@gmail.com> wrote:
> >  
> >> This patch removes the IIO counter subdirectory which is now superceded
> >> by the Counter subsystem. Deprecation warnings are added to the
> >> documentation of the relevant IIO counter sysfs attributes.
> >> 
> >> Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com>  
> >
> >Please drop the directory when it becomes empty rather than in a later
> >patch.  IIRC there are some issues with empty Makefiles that will
> >make building inbetween tricky.
> >
> >For the deprecated markings.
> >
> >Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>  
> 
> I'll have the directory removal occur with the removal of the last
> module then when the directory becomes empty.
> 
> Regarding the deprecation markings, should I select a specific kernel
> version to date the removal of these attributes, or leave the future
> date open as this patch is now?

Leave it open.  The ultimate test is whether it is actually enough of a burden
to make us want to clean up the deprecated interface.

This burden may be that it is a pain to implement something new, or to test
or to maintain the code (or something I haven't thought of).

If it's not it may stay there for ever.

Jonathan
> 
> William Breathitt Gray
> 
> >  
> >> ---
> >>  Documentation/ABI/testing/sysfs-bus-iio          |  8 ++++++++
> >>  .../ABI/testing/sysfs-bus-iio-counter-104-quad-8 | 16 ++++++++++++++++
> >>  drivers/iio/Kconfig                              |  1 -
> >>  drivers/iio/Makefile                             |  1 -
> >>  drivers/iio/counter/Kconfig                      |  8 --------
> >>  drivers/iio/counter/Makefile                     |  5 -----
> >>  6 files changed, 24 insertions(+), 15 deletions(-)
> >>  delete mode 100644 drivers/iio/counter/Kconfig
> >>  delete mode 100644 drivers/iio/counter/Makefile
> >> 
> >> diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
> >> index 731146c3b138..6115d97b075e 100644
> >> --- a/Documentation/ABI/testing/sysfs-bus-iio
> >> +++ b/Documentation/ABI/testing/sysfs-bus-iio
> >> @@ -1637,6 +1637,8 @@ What:		/sys/bus/iio/devices/iio:deviceX/in_countY_raw
> >>  KernelVersion:	4.10
> >>  Contact:	linux-iio@vger.kernel.org
> >>  Description:
> >> +		This interface is deprecated; please use the Counter subsystem.
> >> +
> >>  		Raw counter device counts from channel Y. For quadrature
> >>  		counters, multiplication by an available [Y]_scale results in
> >>  		the counts of a single quadrature signal phase from channel Y.
> >> @@ -1645,6 +1647,8 @@ What:		/sys/bus/iio/devices/iio:deviceX/in_indexY_raw
> >>  KernelVersion:	4.10
> >>  Contact:	linux-iio@vger.kernel.org
> >>  Description:
> >> +		This interface is deprecated; please use the Counter subsystem.
> >> +
> >>  		Raw counter device index value from channel Y. This attribute
> >>  		provides an absolute positional reference (e.g. a pulse once per
> >>  		revolution) which may be used to home positional systems as
> >> @@ -1654,6 +1658,8 @@ What:		/sys/bus/iio/devices/iio:deviceX/in_count_count_direction_available
> >>  KernelVersion:	4.12
> >>  Contact:	linux-iio@vger.kernel.org
> >>  Description:
> >> +		This interface is deprecated; please use the Counter subsystem.
> >> +
> >>  		A list of possible counting directions which are:
> >>  		- "up"	: counter device is increasing.
> >>  		- "down": counter device is decreasing.
> >> @@ -1662,4 +1668,6 @@ What:		/sys/bus/iio/devices/iio:deviceX/in_countY_count_direction
> >>  KernelVersion:	4.12
> >>  Contact:	linux-iio@vger.kernel.org
> >>  Description:
> >> +		This interface is deprecated; please use the Counter subsystem.
> >> +
> >>  		Raw counter device counters direction for channel Y.
> >> diff --git a/Documentation/ABI/testing/sysfs-bus-iio-counter-104-quad-8 b/Documentation/ABI/testing/sysfs-bus-iio-counter-104-quad-8
> >> index 7fac2c268d9a..bac3d0d48b7b 100644
> >> --- a/Documentation/ABI/testing/sysfs-bus-iio-counter-104-quad-8
> >> +++ b/Documentation/ABI/testing/sysfs-bus-iio-counter-104-quad-8
> >> @@ -6,6 +6,8 @@ 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.
> >>  
> >> @@ -13,6 +15,8 @@ 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.
> >> @@ -47,6 +51,8 @@ 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.
> >> @@ -55,6 +61,8 @@ 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.
> >>  
> >> @@ -62,6 +70,8 @@ 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
> >> @@ -83,6 +93,8 @@ 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.
> >> @@ -91,6 +103,8 @@ 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.
> >>  
> >> @@ -98,6 +112,8 @@ 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.
> >> diff --git a/drivers/iio/Kconfig b/drivers/iio/Kconfig
> >> index d69e85a8bdc3..1152efad91a1 100644
> >> --- a/drivers/iio/Kconfig
> >> +++ b/drivers/iio/Kconfig
> >> @@ -74,7 +74,6 @@ source "drivers/iio/afe/Kconfig"
> >>  source "drivers/iio/amplifiers/Kconfig"
> >>  source "drivers/iio/chemical/Kconfig"
> >>  source "drivers/iio/common/Kconfig"
> >> -source "drivers/iio/counter/Kconfig"
> >>  source "drivers/iio/dac/Kconfig"
> >>  source "drivers/iio/dummy/Kconfig"
> >>  source "drivers/iio/frequency/Kconfig"
> >> diff --git a/drivers/iio/Makefile b/drivers/iio/Makefile
> >> index d8cba9c229c0..7bdd31f1b88f 100644
> >> --- a/drivers/iio/Makefile
> >> +++ b/drivers/iio/Makefile
> >> @@ -20,7 +20,6 @@ obj-y += amplifiers/
> >>  obj-y += buffer/
> >>  obj-y += chemical/
> >>  obj-y += common/
> >> -obj-y += counter/
> >>  obj-y += dac/
> >>  obj-y += dummy/
> >>  obj-y += gyro/
> >> diff --git a/drivers/iio/counter/Kconfig b/drivers/iio/counter/Kconfig
> >> deleted file mode 100644
> >> index 95a7a0df6cac..000000000000
> >> --- a/drivers/iio/counter/Kconfig
> >> +++ /dev/null
> >> @@ -1,8 +0,0 @@
> >> -#
> >> -# Counter devices
> >> -#
> >> -# When adding new entries keep the list in alphabetical order
> >> -
> >> -menu "Counters"
> >> -
> >> -endmenu
> >> diff --git a/drivers/iio/counter/Makefile b/drivers/iio/counter/Makefile
> >> deleted file mode 100644
> >> index 8fd3d954775a..000000000000
> >> --- a/drivers/iio/counter/Makefile
> >> +++ /dev/null
> >> @@ -1,5 +0,0 @@
> >> -#
> >> -# Makefile for IIO counter devices
> >> -#
> >> -
> >> -# When adding new entries keep the list in alphabetical order  
> >  
> --
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