pinctrl: Convert unsigned to unsigned int

Simple type conversion with no functional change implied.
While at it, adjust indentation where it makes sense.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20231129161459.1002323-24-andriy.shevchenko@linux.intel.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

pinctrl: Replace kernel.h by what is actually being used

The kernel.h is a mess of unrelated things and we only used it
as a proxy to array_size.h, hence switch from former to the latter.

While at it, group and sort the headers where it makes sense.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

pinctrl: pinconf-generic: add missing of_node_put()

of_node_put() needs to be called when jumping out of the loop, since
for_each_available_child_of_node() will increase the refcount of node.

Fixes: c7289500e29d ("pinctrl: pinconf-generic: scan also referenced phandle node")
Signed-off-by: ZhangPeng <zhangpeng362@huawei.com>
Link: https://lore.kernel.org/r/20221125070156.3535855-1-zhangpeng362@huawei.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

pinctrl: pinconf-generic: Print arguments for bias-pull-*

The bias-pull-* properties, or PIN_CONFIG_BIAS_PULL_* pin config
parameters, accept optional arguments in ohms denoting the strength of
the pin bias.

Print these values out in debugfs as well.

Fixes: eec450713e5c ("pinctrl: pinconf-generic: Add flag to print arguments")
Signed-off-by: Chen-Yu Tsai <wenst@chromium.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Tested-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20220308100956.2750295-2-wenst@chromium.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

pinctrl: pinconf-generic: Add support for "output-impedance-ohms" to be extracted from DT files

Add "output-impedance-ohms" property to generic options used for DT
parsing files. This enables drivers, which use generic pin configurations,
to get the value passed to this property.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20211027134509.5036-3-prabhakar.mahadev-lad.rj@bp.renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

pinctrl: Introduce MODE group in enum pin_config_param

Better to have a MODE group of settings to keep them together
when ordered alphabetically. Hence, rename PIN_CONFIG_LOW_POWER_MODE
to PIN_CONFIG_MODE_LOW_POWER.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20210412140741.39946-2-andriy.shevchenko@linux.intel.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

pinctrl: pinconf-generic: Add function parameter description 'pctldev'

Fix a spelling/typo while we're here.

Fixes the following W=1 kernel build warning(s):

drivers/pinctrl/pinconf-generic.c:242: warning: Function parameter or member 'pctldev' not described in 'pinconf_generic_parse_dt_config'

Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20200713144930.1034632-15-lee.jones@linaro.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

pinctrl: Export some needed symbols at module load time

Export the pin_get_name()/pinconf_generic_parse_dt_config() symbols needed
by the Spreadtrum pinctrl driver when building it as a module.

Signed-off-by: Baolin Wang <baolin.wang7@gmail.com>
Link: https://lore.kernel.org/r/f4e7e20afacb23e6fa7a6b33ea4319b2b3492840.1582776447.git.baolin.wang7@gmail.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 194

Based on 1 normalized pattern(s):

license terms gnu general public license gpl version 2

extracted by the scancode license scanner the SPDX license identifier

GPL-2.0-only

has been chosen to replace the boilerplate/reference in 161 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Alexios Zavras <alexios.zavras@intel.com>
Reviewed-by: Steve Winslow <swinslow@gmail.com>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190528170027.447718015@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

pinctrl: generic: add new 'drive-strength-microamp' property support

Add drive-strength-microamp property support to allow drive strength in uA

Signed-off-by: Guillaume La Roque <glaroque@baylibre.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

pinctrl: Add skew-delay pin config and bindings

Some pin controllers (such as the Gemini) can control the
expected clock skew and output delay on certain pins with a
sub-nanosecond granularity. This is typically done by shunting
in a number of double inverters in front of or behind the pin.
Make it possible to configure this with a generic binding.

Cc: devicetree@vger.kernel.org
Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Hans Ulli Kroll <ulli.kroll@googlemail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

pinctrl: Add sleep related state to indicate sleep related configs

In some scenarios, we should set some pins as input/output/pullup/pulldown
when the specified system goes into deep sleep mode, then when the system
goes into deep sleep mode, these pins will be set automatically by hardware.

That means some pins are not controlled by any specific driver in the OS, but
need to be controlled when entering sleep mode. Thus we introduce one sleep
state config into pinconf-generic for users to configure.

Signed-off-by: Baolin Wang <baolin.wang@spreadtrum.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

pinctrl: Convert to using %pOF instead of full_name

Now that we have a custom printf format specifier, convert users of
full_name to use %pOF instead. This is preparation to remove storing
of the full path string for each node.

Signed-off-by: Rob Herring <robh@kernel.org>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Lee Jones <lee@kernel.org>
Cc: Stefan Wahren <stefan.wahren@i2se.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: Ray Jui <rjui@broadcom.com>
Cc: Scott Branden <sbranden@broadcom.com>
Cc: bcm-kernel-feedback-list@broadcom.com
Cc: Tomasz Figa <tomasz.figa@gmail.com>
Cc: Sylwester Nawrocki <s.nawrocki@samsung.com>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Barry Song <baohua@kernel.org>
Cc: linux-gpio@vger.kernel.org
Cc: linux-rpi-kernel@lists.infradead.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: kernel@stlinux.com
Cc: linux-samsung-soc@vger.kernel.org
Cc: linux-renesas-soc@vger.kernel.org
Acked-by: Krzysztof Kozlowski <krzk@kernel.org>
Acked-by: Ludovic Desroches <ludovic.desroches@microchip.com>
Acked-by: Patrice Chotard <patrice.chotard@st.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

pinctrl: generic: Add output-enable property

Add output-enable generic pin configuration property.
This properties allows enabling/disabling pin's output capabilities
without actually driving any value on the line.

Acked-by: Rob Herring <robh@kernel.org>
[Added inline elaborations on buffer enabling/disabling]
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

Revert "pinctrl: generic: Add bi-directional and output-enable"

This reverts commit 8c58f1a7a4b6d1d723bf25fef9d842d5a11200d0.

It turns out that applying these generic properties was
premature: the properties used in the driver using this
are of unclear electrical nature and the subject need to
be discussed.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

pinctrl: generic: Add bi-directional and output-enable

Add bi-directional and output-enable pin configuration properties.

bi-directional allows to specify when a pin shall operate in input and
output mode at the same time. This is particularly useful in platforms
where input and output buffers have to be manually enabled.

output-enable is just syntactic sugar to specify that a pin shall
operate in output mode, ignoring the provided argument.
This pairs with input-enable pin configuration option.

Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

pinctrl: Fix spelling typos

Just fix spelling typos in comments.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

pinctrl: generic: Parse pinmux init nodes if node status is okay

During pinmux registration, pinmux table is parsed from DT
for making the pinmux table configuration of pins.

Parse the only those node whose status is not disabled.
This will help on reusing the pin configuration table across
platform and disabling the node by status property if that node
is not needed on given platform.

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

pinctrl: pinconf: Add generic helper function for freeing mappings

The pinconf-generic.h file exposes functions for creating generic mappings
but it does not expose a function for freeing the mappings. Add a function
for freeing generic mappings.

Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

pinctrl: pinconf: separate config parameters with commas for debugfs

To improve debugfs readability, use commas instead of whitespaces
for separating configuration parameters.

For example, the "pinconf-pins" dump on my board will change as follows:

Without this commit:

# head -5 pinconf-pins
Pin config settings per pin
Format: pin (name): configs
pin 0 (ED0): input bias pull down output drive strength (8 mA) input enabled
pin 1 (ED1): input bias pull down output drive strength (8 mA) input enabled
pin 2 (ED2): input bias pull down output drive strength (8 mA) input enabled

With this commit:

# head -5 pinconf-pins
Pin config settings per pin
Format: pin (name): configs
pin 0 (ED0): input bias pull down, output drive strength (8 mA), input enabled
pin 1 (ED1): input bias pull down, output drive strength (8 mA), input enabled
pin 2 (ED2): input bias pull down, output drive strength (8 mA), input enabled

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

pinctrl: Rename pinctrl_utils_dt_free_map to pinctrl_utils_free_map

Rename pinctrl_utils_dt_free_map to pinctrl_utils_free_map, since
it does not depend on device tree despite the current name. This
will enforce a consistent naming in pinctr-utils.c and will make
it clear it can be called from outside device tree (e.g. from
ACPI handling code).

Signed-off-by: Irina Tirdea <irina.tirdea@intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

pinctrl: update document for pinconf_generic_parse_dt_config

The returned configs from pinconf_generic_parse_dt_config() is
duplicated from original. Make it clear it must be freed when no
longer necessary.

Signed-off-by: Yingjoe Chen <yingjoe.chen@mediatek.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

pinctrl: pinconf-generic: add "input-schmitt" DT property

PIN_CONFIG_INPUT_SCHMITT is defined in enum_pin_config_param,
but the corresponding DT property is missing.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

pinctrl: pinconf-generic: sort pin configuration params alphabetically

Currently, the dt_params array in drivers/pinctrl/pinconf-generic.c
is not sorted in the same order as the enum pin_config_param in
include/linux/pinctrl/pinconf-generic.h.

Sort enum pin_config_param, conf_items, dt_params, alphabetically
for consistency.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

pinctrl: pinconf-generic: add dt node names to error messages

This makes the error message much more useful.

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

pinctrl: pinconf-generic: scan also referenced phandle node

Make pinconf_generic_dt_node_to_map() also scan the dt pin configuration node
directly referenced by phandle, not only its child nodes.

The "parent scan" feature needs a few other changes:

* Move the pinconf_generic_dt_node_to_map() error handling code to a common
place, under the 'exit' label.

* Move the pins/groups strings count earlier in
pinconf_generic_dt_subnode_to_map(), to allow us to bail out early when
these properties are missing or wrong

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

pinctrl: pinconf-generic: loose DT dependence

New pin controllers such as ACPI-based may also have custom properties
to parse, and should be able to use generic pin config. Let's make the
code compile on !OF systems and rename members a bit to underscore it
is custom parameters and not necessarily DT parameters.

This fixes a build regression for x86_64 on the zeroday kernel builds.

Reported-by: kbuild test robot <fengguang.wu@intel.com>
Reviewed-and-tested-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

pinctrl: pinconf-generic: Allow driver to specify DT params

Additionally to the generic DT parameters, allow drivers to provide
driver-specific DT parameters to be used with the generic parser
infrastructure.

To achieve this 'struct pinctrl_desc' is extended to pass custom pinconf
option to the core. In order to pass this kind of information, the
related data structures - 'struct pinconf_generic_dt_params',
'pin_config_item' - are moved from pinconf internals to the
pinconf-generic header.

Additionally pinconfg-generic is refactored to not only iterate over the
generic pinconf parameters but also take the parameters into account
that are provided through the driver's 'struct pinctrl_desc'.
In particular 'pinconf_generic_parse_dt_config()' and
'pinconf_generic_dump' helpers are split into two parts each. In order
to have a more generic helper that can be used to process the generic
parameters as well as the driver-specific ones.

v2:
- fix typo
- add missing documentation for @conf_items member in struct
- rebase to pinctrl/devel: conflict in abx500
- rename _pinconf_generic_dump() to pinconf_generic_dump_one()
- removed '_' from _parse_dt_cfg()
- removed BUG_ONs, error condition is handled in if statements
- removed pinconf_generic_dump_group() & pinconf_generic_dump_pin
helpers
- fixed up corresponding call sites
- renamed pinconf_generic_dump() to pinconf_generic_dump_pins()
- added kernel-doc to pinconf_generic_dump_pins()
- add kernel-doc
- more verbose commit message

Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
Tested-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

pinctrl: pinconf-generic: Infer map type from DT property

With the new 'groups' property, the DT parser can infer the map type
from the fact whether 'pins' or 'groups' is used to specify the pin
group to work on.

To maintain backwards compatibitliy with current usage of the DT
binding, this is only done when PIN_MAP_TYPE_INVALID is passed to the
parsing function as type.

Also, a new helper 'pinconf_generic_dt_node_to_map_all()' is introduced,
which can be used by drivers as generic callback for dt_node_to_map() to
leverage the new feature.

Changes since v2:
- rename dt_pin_specifier to subnode_target_type
- add additional comment in header file explaining passing an invalid
map type
- mention map_all() helper in commit message
Changes since RFC v2:
- none

Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
Tested-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

pinctrl: pinconf-generic: Declare dt_params/conf_items const

Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

pinctrl: pinconf-generic: Add flag to print arguments

When dumping pinconf information in debugfs, config arguments are only
printed when a unit is present and the argument is != 0. For parameters
like the slew rate, this does not work. The slew rate uses a driver
specific format for the argument, i.e. 0 can be a valid argument and a
unit is not provided for it.
For that reason, add a flag to enable printing the argument instead of
inferring it from the presence of a unit and the value of the argument.

Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

pinctrl: Enable "power-source" to be extracted from DT files

Add "power-source" property to generic options used for DT parsing files.
This enables drivers, which use generic pin configurations, to get the
value passed to this property.

Signed-off-by: Ivan T. Ivanov <iivanov@mm-sol.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

pinctrl: pinconf-generic: Use kmemdup instead of kmalloc + memcpy

This issue was reported by coccicheck using the semantic patch
at scripts/coccinelle/api/memdup.cocci

Signed-off-by: Benoit Taine <benoit.taine@lip6.fr>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

pinctrl: Adds slew-rate, input-enable/disable

This commit adds slew-rate and input-enable/disable support for pinconf
-generic.

Signed-off-by: Sherman Yin <syin@broadcom.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

pinctrl: pinconf-generic: Remove ti prefix in dev_err messages

It does not make sense to show ti prefix in pinconf_generic_dt_subnode_to_map()
dev_err messages.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

pinctrl: utils : add support to pass config type in generic util APIs

Add support to pass the config type like GROUP or PIN when using
the utils or generic pin configuration APIs. This will make the
APIs more generic.

Added additional inline APIs such that it can be use directly as
callback for the pinctrl_ops.

Changes from V1:
- Remove separate implementation for pins and group for
pinctrl_utils_dt_free_map and improve this function
to support both i.e. PINS and GROUPs.

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Reviewed-by: Stephen Warren <swarren@nvidia.com>
Tested-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

pinctrl: pinconf-generic: add generic APIs for mapping pinctrl node

Add generic APIs to map the DT node and its sub node in pinconf generic
driver. These APIs can be used from driver to parse the DT node who
uses the pinconf generic APIs for defining their nodes.

Changes from V1:
- Add generic property for pins and functions in pinconf-generic.
- Add APIs to map the DT and subnode.
- Move common utils APIs to the pinctrl-utils from this file.
- Update the binding document accordingly.
Changes from V2:
- Rebased the pinctrl binding doc on top of Stephen's cleanup.
- Rename properties "pinctrl-pins" and "pinctrl-function" to
"pins" and "function".

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Reviewed-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

pinctrl: remove bindings for pinconf options needing more thought

Some options currently take arguments in unspecified driver-specific units.
As pointed out by Stephen Warren, driver specific values should not be part
of generic devicetree bindings describing the hardware.

Therefore remove the critical bindings again, before they become part of
an official release.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Reviewed-by: James Hogan <james.hogan@imgtec.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

pinctrl: set unit for debounce time pinconfig to usec

Currently the debounce time pinconfig option uses an unspecified
"time units" unit. As pinconfig options should use SI units and a
real unit is also necessary for generic dt bindings, change it
to usec. Currently no driver is using the generic pinconfig option
for this, so the unit change is safe to do.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Reviewed-by: James Hogan <james.hogan@imgtec.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

pinctrl: dynamically alloc temp array when parsing dt pinconf options

Allocating the temorary array in pinconf_generic_parse_dt_config on stack
might cause problems later on, when the number of options grows over time.
Therefore also allocate this array dynamically to be on the safe side.

Suggested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Reviewed-by: James Hogan <james.hogan@imgtec.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

pinctrl: handle zero found dt pinconfig properties better

This adds a shortcut when no valid pinconf properties are found
in the parsed dt node, to set the values immediately and return.

Suggested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Reviewed-by: James Hogan <james.hogan@imgtec.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

pinctrl: clarify some dt pinconfig options

The bias-pull-* options use values > 0 to indicate that the pull should
be activated and optionally also indicate the strength of the pull.
Therefore use an default value of 1 for these options.

Split the low-power-mode option into low-power-enable and -disable.

Update the documentation to describe the param arguments better.

Reported-by: James Hogan <james.hogan@imgtec.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

pinctrl: add function to parse generic pinconfig properties from a dt node

pinconf_generic_parse_dt_config() takes a node as input and generates an
array of generic pinconfig values from the properties of this node.

As I couldn't find a mechanism to count the number of properties of a node
the function uses internally an array to accept one of parameter and copies
the real present options to a smaller variable at its end.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

pinctrl: add pinconf-generic define for a pin-default pull

There exist controllers that don't support to set the pull to up or down
separately but instead automatically set the pull direction based on
embedded knowledge inside the controller, for example depending on the
selected mux function of the pin.

Therefore this patch adds another config option to use this default
pull-state for a pin where it is not possible to know or decide if the
pin will be pulled up or down.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Reviewed-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

pinconf-generic: add BIAS_BUS_HOLD pinconf

Add a new PIN_CONFIG_BIAS_BUS_HOLD pin configuration for a bus holder
pin mode (also known as bus keeper, or repeater). This is a weak latch
which drives the last value on a tristate bus. Another device on the bus
can drive the bus high or low before going tristate to change the value
driven by the pin.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

pinconf-generic: add drive strength to debugfs output

Add the drive strength pinconf to debugfs output (with the unit "mA").

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

pinctrl: generic: Fix checkpatch errors

Fixes the following type of checkpatch errors:
ERROR: space required before the open parenthesis '('

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

pinctrl: generic: Make 'conf_items' static

'conf_items' is used only in this file. Silences the below
sparse warning:
drivers/pinctrl/pinconf-generic.c:37:24: warning:
symbol 'conf_items' was not declared. Should it be static?

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

pinctrl: generic: dump pin configuration

Add the support of dumping pin configuration.

Signed-off-by: Haojian Zhuang <haojian.zhuang@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

pinctrl: generic: rename input schmitt disable

Rename PIN_CONFIG_INPUT_SCHMITT_DISABLE to
PIN_CONFIG_INPUT_SCHMITT_ENABLE. It's used to make it more generialize.

Signed-off-by: Haojian Zhuang <haojian.zhuang@linaro.org>
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

pinctrl: generic: add slew rate config parameter

Add PIN_CONFIG_SLEW_RATE parameter into pinconf-generic driver.

Signed-off-by: Haojian Zhuang <haojian.zhuang@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

pinctrl: add pinconf-generic defines for output

This adds a definition of a generic output configuration
for a certain pin when using the generic pin configuration
library. Whereas driving pins low/high is usually a GPIO
business, you may want to set up pins into a default state
using hogs, and never touch them again. This helps out
with that scenario.

Based on a patch from Patrice Chotard.

Signed-off-by: Patrice Chotard <patrice.chotard@stericsson.com>
Reviewed-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

pinctrl: generic: add input schmitt disable parameter

In Marvell PXA/MMP silicons, input schmitt disable value is 0x40, not 0.
So append new config parameter -- input schmitt disable.

Signed-off-by: Haojian Zhuang <haojian.zhuang@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

pinctrl: introduce generic pin config

This is a split-off from the earlier patch set which adds generic
pin configuration for the pin controllers that want it. Since
we may have a system with mixed generic and custom pin controllers,
we pass a boolean in the pin controller ops vtable to indicate
if it is generic.

ChangeLog v1->v5:
- Follow parent patch versioning number system.
- Document the semantic meaning of return values from pin config
get functions, so we can iterate over pins and check their
properties from debugfs as part of the generic config code.
- Use proper cast functions in the generic debugfs pin config
file.
- Expand generic config to optionally cover groups too.
ChangeLog v5->v6:
- Update to match underlying changes.
ChangeLog v6->v7:
- Drop DRIVE_OFF parameter, use bias high impedance for this
- Delete argument for drive modes push-pull, od and os. These
are now just state transitions.
- Delete slew rate rising/falling due to discussions on on
proper semantics
- Drop config wakeup, struct irq_chip does this for now, add
back if need be.
- Set PIN_CONFIG_END to 0x7fff making room for custom config
parameters from 0x8000 and up.
- Prefix accessor functions with pinconf_