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This patch adds device tree support for the bcm2835 GPIO driver.
Signed-off-by: Fabian Vogt <[email protected]>
Reviewed-by: Simon Glass <[email protected]>
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TI's PCF8575 is a 16-bit I2C GPIO expander.The device features a
16-bit quasi-bidirectional I/O ports. Each quasi-bidirectional I/O can
be used as an input or output without the use of a data-direction
control signal. The I/Os should be high before being used as inputs.
Read the device documentation for more details[1].
This driver is based on pcf857x driver available in Linux v4.7 kernel.
It supports basic reading and writing of gpio pins.
[1] http://www.ti.com/lit/ds/symlink/pcf8575.pdf
Signed-off-by: Vignesh R <[email protected]>
Reviewed-by: Tom Rini <[email protected]>
Reviewed-by: Simon Glass <[email protected]>
Reviewed-by: Mugunthan V N <[email protected]>
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This updates the device-tree-bindings doc for x86-pinctrl driver:
- clarify "gpio-offset" is required only when "mode-gpio" is set
- correct property name "pull-strength"
- use tab instead of space at several places
Signed-off-by: Bin Meng <[email protected]>
Reviewed-by: Stefan Roese <[email protected]>
Reviewed-by: Simon Glass <[email protected]>
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Tegra186's GPIO controller register layout is significantly different from
previous chips, so add a new driver for it. In fact, there are two
different GPIO controllers in Tegra186 that share a similar register
layout, but very different port mapping. This driver covers both.
The DT binding is already present in the Linux kernel (in linux-next via
the Tegra tree so far).
Signed-off-by: Stephen Warren <[email protected]>
Reviewed-by: Simon Glass <[email protected]> # v1
Signed-off-by: Tom Warren <[email protected]>
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This driver supports GPIOs present on PM8916 PMIC.
There are 2 device drivers inside:
- GPIO driver (4 "generic" GPIOs)
- Keypad driver that presents itself as GPIO with 2 inputs (power and reset)
Signed-off-by: Mateusz Kulikowski <[email protected]>
Reviewed-by: Simon Glass <[email protected]>
Tested-by: Simon Glass <[email protected]>
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Add support for gpio controllers on Qualcomm Snapdragon devices.
This devices are usually called Top Level Mode Multiplexing in
Qualcomm documentation.
Signed-off-by: Mateusz Kulikowski <[email protected]>
Reviewed-by: Simon Glass <[email protected]>
Tested-by: Simon Glass <[email protected]>
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GPIO pins need to be set up on start-up. Add a driver to provide this,
configured from the device tree.
The binding is slightly different from the existing ICH6 binding, since that
is quite verbose. The new binding should be just as extensible.
Signed-off-by: Simon Glass <[email protected]>
Acked-by: Bin Meng <[email protected]>
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Make a few minor updates to make the meaning clearer.
Signed-off-by: Simon Glass <[email protected]>
Reviewed-by: Bin Meng <[email protected]>
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Add a driver which sets up the pin configuration on x86 devices with an ICH6
(or later) Platform Controller Hub.
The driver is not in the pinctrl uclass due to some oddities of the way x86
devices work:
- The GPIO controller is not present in I/O space until it is set up
- This is done by writing a register in the PCH
- The PCH has a driver which itself uses PCI, another driver
- The pinctrl uclass requires that a pinctrl device be available before any
other device can be probed
It would be possible to work around the limitations by:
- Hard-coding the GPIO address rather than reading it from the PCH
- Using special x86 PCI access to set the GPIO address in the PCH
However it is not clear that this is better, since the pin configuration
driver does not actually provide normal pin configuration services - it
simply sets up all the pins statically when probed. While this remains the
case, it seems better to use a syscon uclass instead. This can be probed
whenever it is needed, without any limitations.
Also add an 'invert' property to support inverting the input.
Signed-off-by: Simon Glass <[email protected]>
Reviewed-by: Bin Meng <[email protected]>
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Convert altera_pio to driver model.
Signed-off-by: Thomas Chou <[email protected]>
Acked-by: Chin Liang See <[email protected]>
Reviewed-by: Simon Glass <[email protected]>
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Every pin can be configured now from the device tree. A dt-bindings
has been added to describe the different property available.
Change-Id: I1668886062655f83700d0e7bbbe3ad09b19ee975
Signed-off-by: Gabriel Huau <[email protected]>
Acked-by: Simon Glass <[email protected]>
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[ imported from Linux Kernel, commit 74981fb81d83 ]
Signed-off-by: Masahiro Yamada <[email protected]>
Acked-by: Laurent Pinchart <[email protected]>
Signed-off-by: Linus Walleij <[email protected]>
Acked-by: Simon Glass <[email protected]>
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At present the tegra GPIO driver does not fully support the existing device
tree binding, but add the binding file to cover the existing partial support.
Signed-off-by: Simon Glass <[email protected]>
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At present the exynos GPIO driver does not fully support the existing device
tree binding, but add the binding file to cover the existing partial support.
Signed-off-by: Simon Glass <[email protected]>
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Add the binding file that we are about to support.
Signed-off-by: Simon Glass <[email protected]>
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