BACKPORT: gpio: fixes for gpio-hog support

recently added gpio hog patch was "in discussion"
state with Simon Glass. This patch now adds most
of comments from Simon Glass.

Signed-off-by: Heiko Scho

BACKPORT: gpio: fixes for gpio-hog support

recently added gpio hog patch was "in discussion"
state with Simon Glass. This patch now adds most
of comments from Simon Glass.

Signed-off-by: Heiko Schocher <hs@denx.de>
(cherry picked from commit 49b10cb4926285b856b207c1f5bb40c75487f08b)
Change-Id: I622699122cdb28f3fdede9a3a13de7c25a54b702
Signed-off-by: Wyon Bi <bivvy.bi@rock-chips.com>

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BACKPORT: gpio: add gpio-hog support

add gpio-hog support. GPIO hogging is a mechanism
providing automatic GPIO request and configuration
as part of the gpio-controller's driver probe function.

for

BACKPORT: gpio: add gpio-hog support

add gpio-hog support. GPIO hogging is a mechanism
providing automatic GPIO request and configuration
as part of the gpio-controller's driver probe function.

for more infos see:
doc/device-tree-bindings/gpio/gpio.txt

Signed-off-by: Heiko Schocher <hs@denx.de>
Tested-by: Michal Simek <michal.simek@xilinx.com> (zcu102)
Tested-by: Patrick Delaunay <patrick.delaunay@st.com>
(cherry picked from commit 5fc7cf8c8e268590f3b0037eecea7f6798209f78)
Change-Id: I73dc38ff9f38085d9ed5ee39b28d795f4adc68a0
Signed-off-by: Wyon Bi <bivvy.bi@rock-chips.com>

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dm: gpio: Add live tree support

Add support for requesting GPIOs with a live device tree.

This involves adjusting the function signature for the legacy function
gpio_request_by_name_nodev(), so fix

dm: gpio: Add live tree support

Add support for requesting GPIOs with a live device tree.

This involves adjusting the function signature for the legacy function
gpio_request_by_name_nodev(), so fix up all callers.

Signed-off-by: Simon Glass <sjg@chromium.org>
Fixes to stm32f746-disco.c:
Signed-off-by: Tom Rini <trini@konsulko.com>

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dm: gpio: Drop blank line in gpio_xlate_offs_flags() comment

This is not needed. Drop it.

Signed-off-by: Simon Glass <sjg@chromium.org>

dm: gpio: Refactor to prepare for live tree support

Move the main part of the GPIO request function into a separate function
so that it can be used by the live tree function when added. Update the
x

dm: gpio: Refactor to prepare for live tree support

Move the main part of the GPIO request function into a separate function
so that it can be used by the live tree function when added. Update the
xlate method to use a node reference.

Update all GPIO drivers to handle the modified xlate() method.

Signed-off-by: Simon Glass <sjg@chromium.org>

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Merge branch 'master' of git://git.denx.de/u-boot

Signed-off-by: Stefano Babic <sbabic@denx.de>

Merge branch 'master' of git://git.denx.de/u-boot-mpc85xx

dm: gpio: Add methods for open drain setting

Certain GPIO devices have the capability to switch their GPIOs into
open-drain mode, that is, instead of actively driving the output
(Push-pull output),

dm: gpio: Add methods for open drain setting

Certain GPIO devices have the capability to switch their GPIOs into
open-drain mode, that is, instead of actively driving the output
(Push-pull output), the pin is connected to the collector (for a NPN
transistor) or the drain (for a MOSFET) of a transistor, respectively.
The pin then either forms an open circuit or a connection to ground,
depending on the state of the transistor.

This patch adds functions to the GPIO uclass to switch GPIOs to
open-drain mode on devices that support it.

Signed-off-by: Mario Six <mario.six@gdsys.cc>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: York Sun <york.sun@nxp.com>

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Merge branch 'master' of git://git.denx.de/u-boot

Merge git://git.denx.de/u-boot-dm

dm: gpio: add a default gpio xlate routine

Many drivers use a common form of offset + flags for device
tree nodes. e.g.:
<&gpio1 2 GPIO_ACTIVE_LOW>

This patch adds a common implementation of this

dm: gpio: add a default gpio xlate routine

Many drivers use a common form of offset + flags for device
tree nodes. e.g.:
<&gpio1 2 GPIO_ACTIVE_LOW>

This patch adds a common implementation of this type of parsing
and calls it when a gpio driver doesn't supply its' own xlate
routine.

This will allow removal of the driver-specific versions in a
handful of drivers and simplify the addition of new drivers.

Signed-off-by: Eric Nelson <eric@nelint.com>
Reviewed-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Simon Glass <sjg@chromium.org>

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gpio: Use const where possible

Some functions do not change the struct gpio_desc parameter. Update these to
use const so this is clear.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bi

gpio: Use const where possible

Some functions do not change the struct gpio_desc parameter. Update these to
use const so this is clear.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

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gpio: Add a function to obtain a GPIO vector value

We can use GPIOs as binary digits for reading 'strapping' values. Each GPIO
is assigned a single bit and can be set high or low on the circuit boar

gpio: Add a function to obtain a GPIO vector value

We can use GPIOs as binary digits for reading 'strapping' values. Each GPIO
is assigned a single bit and can be set high or low on the circuit board. We
already have a legacy function for reading these values. Add one that
supports driver model.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

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dm: gpio: Add dm_gpio_request() to manually request a GPIO

This function can be used for testing to manually request a GPIO for use,
without resorting to the legacy GPIO API.

Signed-off-by: Simon G

dm: gpio: Add dm_gpio_request() to manually request a GPIO

This function can be used for testing to manually request a GPIO for use,
without resorting to the legacy GPIO API.

Signed-off-by: Simon Glass <sjg@chromium.org>

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dm: gpio: Add dm_gpio_lookup_name() to look up a GPIO name

Provide a driver-model function to look up a GPIO name. Make the standard
function use it.

Signed-off-by: Simon Glass <sjg@chromium.org>

Merge branch 'u-boot/master' into 'u-boot-arm/master'

Merge git://git.denx.de/u-boot-dm

gpio: fix typos in GPIO header

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

dm: gpio: Fix comment typo in GPIOD_IS_IN

This should say 'in', not 'out'.

Signed-off-by: Simon Glass <sjg@chromium.org>

Merge branch 'master' of git://git.denx.de/u-boot-tegra

dm: gpio: Add error handling and a function to claim vector GPIOs

gpio_get_values_as_int() should return an error if something goes wrong.
Also provide gpio_claim_vector(), a function to request the

dm: gpio: Add error handling and a function to claim vector GPIOs

gpio_get_values_as_int() should return an error if something goes wrong.
Also provide gpio_claim_vector(), a function to request the GPIOs and set
them to input mode. Otherwise callers have to do this themselves.

Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Warren <twarren@nvidia.com>

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Merge remote-tracking branch 'u-boot/master' into 'u-boot-arm/master'

Merge branch 'master' of git://git.denx.de/u-boot

Merge branch 'master' of git://git.denx.de/u-boot-dm

dm: gpio: Mark the old GPIO API deprecated

Add a deprecation notice to each function so that it is more obvious that we
are moving GPIOs to driver model.

Signed-off-by: Simon Glass <sjg@chromium.or

dm: gpio: Mark the old GPIO API deprecated

Add a deprecation notice to each function so that it is more obvious that we
are moving GPIOs to driver model.

Signed-off-by: Simon Glass <sjg@chromium.org>

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