u-boot.git/include/asm-generic/gpio.h, branch v2018.09

SPDX: Convert all of our single license tags to Linux Kernel style

2018-05-07T13:34:12+00:00

When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini

dm: gpio: Add live tree support

2017-06-01T13:03:10+00:00

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 
Fixes to stm32f746-disco.c:
Signed-off-by: Tom Rini

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

2017-06-01T13:03:10+00:00

This is not needed. Drop it.

Signed-off-by: Simon Glass

dm: gpio: Refactor to prepare for live tree support

2017-06-01T13:03:10+00:00

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

dm: gpio: Add methods for open drain setting

2016-06-04T05:13:52+00:00

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 
Reviewed-by: Simon Glass 
Reviewed-by: York Sun

dm: gpio: add a default gpio xlate routine

2016-05-17T15:54:43+00:00

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 
Reviewed-by: Stephen Warren 
Acked-by: Simon Glass

gpio: Use const where possible

2016-03-17T02:27:22+00:00

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

Signed-off-by: Simon Glass 
Reviewed-by: Bin Meng

gpio: Add a function to obtain a GPIO vector value

2016-03-17T02:27:22+00:00

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 
Reviewed-by: Bin Meng

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

2015-07-21T23:39:23+00:00

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

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

2015-07-21T23:39:23+00:00

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

Signed-off-by: Simon Glass