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>

1 files changed, 8 insertions, 9 deletions

diff --git a/drivers/gpio/gpio-max732x.c b/drivers/gpio/gpio-max732x.c
index a9aaf9d822b4..4ea4c6a1313b 100644
--- a/drivers/gpio/gpio-max732x.c
+++ b/drivers/gpio/gpio-max732x.c
@@ -520,20 +520,19 @@ static int max732x_irq_setup(struct max732x_chip *chip,
 				client->irq);
 			return ret;
 		}
-		ret =  gpiochip_irqchip_add(&chip->gpio_chip,
-					    &max732x_irq_chip,
-					    irq_base,
-					    handle_simple_irq,
-					    IRQ_TYPE_NONE);
+		ret =  gpiochip_irqchip_add_nested(&chip->gpio_chip,
+						   &max732x_irq_chip,
+						   irq_base,
+						   handle_simple_irq,
+						   IRQ_TYPE_NONE);
 		if (ret) {
 			dev_err(&client->dev,
 				"could not connect irqchip to gpiochip\n");
 			return ret;
 		}
-		gpiochip_set_chained_irqchip(&chip->gpio_chip,
-					     &max732x_irq_chip,
-					     client->irq,
-					     NULL);
+		gpiochip_set_nested_irqchip(&chip->gpio_chip,
+					    &max732x_irq_chip,
+					    client->irq);
 	}
 
 	return 0;