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| author | Milo Kim <milo.kim@ti.com> | 2013-12-06 11:18:42 +0900 |
|---|---|---|
| committer | Lee Jones <lee.jones@linaro.org> | 2014-01-21 08:27:57 +0000 |
| commit | 0cc59b9d98d554168915b3765a14e8b4ad75918c (patch) | |
| tree | 7939471290934e3482ecc8bc5a679e455159c205 /drivers/gpio/Kconfig | |
| parent | 25a7a6f4a200e2eb04d87fb1c06130b1a85aa688 (diff) | |
| download | lwn-0cc59b9d98d554168915b3765a14e8b4ad75918c.tar.gz lwn-0cc59b9d98d554168915b3765a14e8b4ad75918c.zip | |
gpio: add LP3943 I2C GPIO expander driver
This is one of LP3943 MFD driver.
LP3943 is configurable as a GPIO expander, up to 16 GPIOs.
* Application note: how to configure LP3943 as a GPIO expander
http://www.ti.com/lit/an/snva287a/snva287a.pdf
* Supported GPIO controller operations
request, free, direction_input, direction_output, get and set
* GPIO direction register not supported
LP3943 doesn't have the GPIO direction register. It only provides input and
output status registers.
So, private data for the direction should be handled manually.
This variable is updated whenever the direction is changed and
used in 'get' operation.
* Pin assignment
A driver data, 'pin_used' is checked when a GPIO is requested.
If the GPIO is already assigned, then returns as failure.
If the GPIO is available, 'pin_used' is set.
When the GPIO is not used anymore, then it is cleared.
It is defined as unsigned long type for atomic bit operation APIs,
but only LSB 16bits are used because LP3943 has 16 outputs.
Signed-off-by: Milo Kim <milo.kim@ti.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Diffstat (limited to 'drivers/gpio/Kconfig')
| -rw-r--r-- | drivers/gpio/Kconfig | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index 0f0444475bf0..7ef68e65918f 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -381,6 +381,14 @@ config GPIO_ARIZONA help Support for GPIOs on Wolfson Arizona class devices. +config GPIO_LP3943 + tristate "TI/National Semiconductor LP3943 GPIO expander" + depends on MFD_LP3943 + help + GPIO driver for LP3943 MFD. + LP3943 can be used as a GPIO expander which provides up to 16 GPIOs. + Open drain outputs are required for this usage. + config GPIO_MAX7300 tristate "Maxim MAX7300 GPIO expander" depends on I2C |