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| author | Vladimir Zapolskiy <vz@mleia.com> | 2018-11-29 00:48:41 +0200 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2018-12-07 10:52:51 +0100 |
| commit | 5ddabfe8d3ded5dd5e760bf66ebb4241e5314e8d (patch) | |
| tree | 039abd51c652734d32888dd8e68c86b96f4106bc /drivers/gpio/Kconfig | |
| parent | 985d8d5c76dcdc8f4c8ceea8fae71e4a45a0a200 (diff) | |
| download | lwn-5ddabfe8d3ded5dd5e760bf66ebb4241e5314e8d.tar.gz lwn-5ddabfe8d3ded5dd5e760bf66ebb4241e5314e8d.zip | |
gpio: lpc18xx: add GPIO pin interrupt controller support
The change adds support of LPC18xx/LPC43xx GPIO pin interrupt controller
block within SoC GPIO controller. The new interrupt controller driver
allows to configure and capture edge or level interrupts on 8 arbitrary
selectedinput GPIO pins, and lift the signals to be reported as NVIC rising
edge interrupts. Configuration of a particular GPIO pin to serve as
interrupt and its mapping to an interrupt on NVIC is done by SCU pin
controller, for more details see description of 'nxp,gpio-pin-interrupt'
device tree property of a GPIO pin [1].
From LPC18xx and LPC43xx User Manuals the GPIO controller consists of
the following blocks:
* GPIO pin interrupt block at 0x40087000, this change adds its support,
* GPIO GROUP0 interrupt block at 0x40088000,
* GPIO GROUP1 interrupt block at 0x40089000,
* GPIO port block at 0x400F4000, it is supported by the original driver.
While all 4 sub-controller blocks have their own I/O addresses, moreover
all 3 interrupt blocks are APB0 peripherals and high-speed GPIO block is
an AHB slave, according to the hardware manual the GPIO controller is
seen as a single block, and 4 sub-controllers have the shared reset signal
RGU #28 and clock to register interface CLK_CPU_GPIO on CCU1.
Likely support of two GPIO group interrupt blocks won't be added in short
term, because the mechanism to mask several interrupt sources is not well
defined.
[1] Documentation/devicetree/bindings/pinctrl/nxp,lpc1850-scu.txt
Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio/Kconfig')
| -rw-r--r-- | drivers/gpio/Kconfig | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index 833a1b51c948..a1876c39a7b7 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -288,6 +288,7 @@ config GPIO_LPC18XX tristate "NXP LPC18XX/43XX GPIO support" default y if ARCH_LPC18XX depends on OF_GPIO && (ARCH_LPC18XX || COMPILE_TEST) + select IRQ_DOMAIN_HIERARCHY help Select this option to enable GPIO driver for NXP LPC18XX/43XX devices. |