linux-toradex.git/drivers/gpio/gpio-ath79.c, branch v4.14

gpio: ath79: make use of raw_spinlock variants

2017-03-16T20:52:08+00:00

The ath79 gpio driver currently implements an irq_chip for handling
interrupts; due to how irq_chip handling is done, it's necessary for the
irq_chip methods to be invoked from hardirq context, even on a a
real-time kernel.  Because the spinlock_t type becomes a "sleeping"
spinlock w/ RT kernels, it is not suitable to be used with irq_chips.

A quick audit of the operations under the lock reveal that they do only
minimal, bounded work, and are therefore safe to do under a raw spinlock.

Signed-off-by: Julia Cartwright 
Acked-by: Aban Bedel 
Signed-off-by: Linus Walleij

gpio: ath79: Fix module autoload

2016-10-23T22:23:05+00:00

If the driver is built as a module, autoload won't work because the module
alias information is not filled. So user-space can't match the registered
device with the corresponding module.

Export the module alias information using the MODULE_DEVICE_TABLE() macro.

Before this patch:

$ modinfo drivers/gpio/gpio-ath79.ko | grep alias
$

After this patch:

$ modinfo drivers/gpio/gpio-ath79.ko | grep alias
alias:          of:N*T*Cqca,ar9340-gpioC*
alias:          of:N*T*Cqca,ar9340-gpio
alias:          of:N*T*Cqca,ar7100-gpioC*
alias:          of:N*T*Cqca,ar7100-gpio

Signed-off-by: Javier Martinez Canillas 
Acked-by: Aban Bedel 
Signed-off-by: Linus Walleij

gpio: ath79: fix implicit assumption module.h is present

2016-09-15T12:01:36+00:00

The Kconfig for this file is:

drivers/gpio/Kconfig:config GPIO_ATH79
drivers/gpio/Kconfig: tristate "Atheros AR71XX/AR724X/AR913X GPIO support"

...but however it does not include module.h -- it in turn gets it from
another header (gpio/driver.h) and we'd like to replace that with a
forward delcaration of "struct module;" but if we do, this file will
fail to compile.

So we fix this first to avoid putting build failures into the bisect
commit history.

Cc: Linus Walleij 
Cc: Alexandre Courbot 
Cc: linux-gpio@vger.kernel.org
Signed-off-by: Paul Gortmaker 
Signed-off-by: Linus Walleij

gpio: ath79: Check valid gpio count for both DT and non-DT cases

2016-02-25T14:20:43+00:00

Move the code checking valid gpio count to cover both DT and non-DT cases.

Signed-off-by: Axel Lin 
Acked-by: Alban Bedel 
Signed-off-by: Linus Walleij

gpio: ath79: Update the copyright notice

2016-02-10T10:38:21+00:00

Add myself to the copyright list and remove the reference to Atheros'
BSP as nothing is left of this code.

Signed-off-by: Alban Bedel 
Signed-off-by: Linus Walleij

gpio: ath79: Add support for the interrupt controller

2016-02-10T10:15:24+00:00

Add support for the interrupt controller using GPIOLIB_IRQCHIP.
Both edges isn't supported by the chip and has to be emulated
by switching the polarity on each interrupt.

Signed-off-by: Alban Bedel 
Signed-off-by: Linus Walleij

gpio: ath79: Make the driver removable

2016-02-10T10:14:08+00:00

As we now allow the driver to be built as a module it should be
removable.

Signed-off-by: Alban Bedel 
Signed-off-by: Linus Walleij

gpio: ath79: Allow building in compile tests

2016-02-10T10:08:31+00:00

To allow building the driver in compile tests we must drop the
dependency on asm/mach-ath79/ar71xx_regs.h. For this we replace the
include with local definition of the registers needed for this driver.

Signed-off-by: Alban Bedel 
Signed-off-by: Linus Walleij

gpio: ath79: Move to the generic GPIO driver

2016-02-10T10:07:24+00:00

Drop most of the code in favor of the generic MMIO GPIO driver.
As the driver now depend on CONFIG_GPIO_GENERIC also add a Kconfig
entry to make the driver optional.

We leave the base pointer and lock in the data struct because they are
needed for the IRQ support.

Signed-off-by: Alban Bedel 
Acked-by: Alexandre Courbot 
Signed-off-by: Linus Walleij

gpio: ath79: use gpiochip data pointer

2016-01-05T10:21:03+00:00

This makes the driver use the data pointer added to the gpio_chip
to store a pointer to the state container instead of relying on
container_of().

Acked-by: Alban Bedel 
Signed-off-by: Linus Walleij