gpio: simplify adding threaded interrupts
authorLinus Walleij <linus.walleij@linaro.org>
Thu, 24 Nov 2016 09:57:25 +0000 (10:57 +0100)
committerLinus Walleij <linus.walleij@linaro.org>
Fri, 25 Nov 2016 14:12:27 +0000 (15:12 +0100)
commitd245b3f9bd36f02fd641cba9931d8b4c77126e74
treefa9984376f28c4f6b8883aff8a704178aa68412f
parent07d9a380680d1c0eb51ef87ff2eab5c994949e69
gpio: simplify adding threaded interrupts

This tries to simplify the use of CONFIG_GPIOLIB_IRQCHIP when
using threaded interrupts: add a new call
gpiochip_irqchip_add_nested() to indicate that we're dealing
with a nested rather than a chained irqchip, then create a
separate gpiochip_set_nested_irqchip() to mirror
the gpiochip_set_chained_irqchip() call to connect the
parent and child interrupts.

In the nested case gpiochip_set_nested_irqchip() does nothing
more than call irq_set_parent() on each valid child interrupt,
which has little semantic effect in the kernel, but this is
probably still formally correct.

Update all drivers using nested interrupts to use
gpiochip_irqchip_add_nested() so we can now see clearly
which these users are.

The DLN2 driver can drop its specific hack with
.irq_not_threaded as we now recognize whether a chip is
threaded or not from its use of gpiochip_irqchip_add_nested()
signature rather than from inspecting .can_sleep.

We rename the .irq_parent to .irq_chained_parent since this
parent IRQ is only really kept around for the chained
interrupt handlers.

Cc: Lars Poeschel <poeschel@lemonage.de>
Cc: Octavian Purdila <octavian.purdila@intel.com>
Cc: Daniel Baluta <daniel.baluta@intel.com>
Cc: Bin Gao <bin.gao@linux.intel.com>
Cc: Mika Westerberg <mika.westerberg@linux.intel.com>
Cc: Ajay Thomas <ajay.thomas.david.rajamanickam@intel.com>
Cc: Semen Protsenko <semen.protsenko@globallogic.com>
Cc: Alexander Stein <alexander.stein@systec-electronic.com>
Cc: Phil Reid <preid@electromag.com.au>
Cc: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Cc: Patrice Chotard <patrice.chotard@st.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
13 files changed:
Documentation/gpio/driver.txt
drivers/gpio/gpio-adnp.c
drivers/gpio/gpio-crystalcove.c
drivers/gpio/gpio-dln2.c
drivers/gpio/gpio-max732x.c
drivers/gpio/gpio-mcp23s08.c
drivers/gpio/gpio-pca953x.c
drivers/gpio/gpio-pcf857x.c
drivers/gpio/gpio-stmpe.c
drivers/gpio/gpio-tc3589x.c
drivers/gpio/gpio-wcove.c
drivers/gpio/gpiolib.c
include/linux/gpio/driver.h