This commit reviews driver includes reordering them in
alphabetic order. This improves readability.
Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Reviewed-by: NeilBrown <neil@brown.name>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
There is no special gain in using pointers for 'gc_map' inside
'mtk_data' structure. We know the number of banks which is fixed
to MTK_BANK_CNT and we can just statically allocate them without
using kernel allocators.
Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Reviewed-by: NeilBrown <neil@brown.name>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
There are macros in gpio kernel's headers to define direction
of a gpio. Use them instead of return custom '0' and '1' values.
Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Reviewed-by: NeilBrown <neil@brown.name>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Function to_mediatek_gpio can directly return without declaring
anything else in its body improving readability. Also change
pointer '*' declaration to be with return type in the upper line.
Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Reviewed-by: NeilBrown <neil@brown.name>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit update documentation for #interrupt-cells property in
the gpio node which has been changed from '1' to '2'.
Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Reviewed-by: NeilBrown <neil@brown.name>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Most gpio chips have two cells for interrupts and this should be also.
Set this property in the device tree accordly fixing this up. In order
to make this working properly the xlate function for the irq_domain must
be updated to use the 'irq_domain_xlate_twocell' one in the driver.
One more minimal change is needed two refer gpio's interrupt-parent from
other nodes which is to add new 'gpio' label in the device tree.
Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Reviewed-by: NeilBrown <neil@brown.name>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit reviews and complete documentation for gpio related stuff
in the mt7621 device. It should be complete now.
Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Reviewed-by: NeilBrown <neil@brown.name>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Functions mediatek_gpio_irq_umask mediatek_gpio_irq_unmask are
reading and modifying registers but only the write is being hold.
It should be a complete lock instead for those which are type of
"read-modify-write". This makes more sense.
Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Reviewed-by: NeilBrown <neil@brown.name>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
mediatek_gpio_get_direction function is holding across a simple read
which it seems to be not neccessary at all. Just remove this locking
cleaning code of this function a bit.
Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Reviewed-by: NeilBrown <neil@brown.name>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
BIT macro is being used to get mask for gpio's pin
which is retrieved using 'hwirq' from struct irq_data.
The problem here is that 'hwirq' can be as large as 95,
and 1UL << 95 is unlikely to work well. Instead of using
BIT macro use a new PIN_MASK macro which takes into account
pin and WIDTH of the bank in order to make a proper mask for
the gpio pin. Also 'd->hwirq' has been replaced by 'pin' in
some places because there was a 'pin' variable in changed
functions with the proper value. This improves readability.
Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Reviewed-by: NeilBrown <neil@brown.name>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
The driver's init function don't do anything besides registering the platform
driver, and the exit function which is not included in the driver should only
do driver unregister. Because of this module_platform_driver() macro could
just be used instead of having separate functions.
Currently the macro is not being used because the driver is initialized at
subsys init call level but this isn't necessary since platform devices are
defined in the DT as dependencies so there's no need for init calls order.
Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Reviewed-by: NeilBrown <neil@brown.name>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
There are 3 banks of gpios numbered '0' and '1' and '2'. So
the maximum bank number is "2". "3" is the count of banks.
In order to make the code looks and be correct on checking
max allowed gpio's id it makes sense to change the name of
this definition. Also there is another definitions which
start with the same prefix MKK_BANK_ of the new name so
having those with the same prefix makes all preprocessor
structure to be the same. This improves readability.
Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Reviewed-by: NeilBrown <neil@brown.name>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
There are some places where magic number '32' is being used to get
the gpio bank. There already exist a definition MTK_BANK_WIDTH
with this value, so just use it instead.
Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Reviewed-by: NeilBrown <neil@brown.name>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commits replaces if statement and two returns in favour
of a only one return using a ternary operator.
Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Reviewed-by: NeilBrown <neil@brown.name>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Driver probe function includes an allocation using devm_kzalloc
which is "hidden" a bit inside the declarations. Extract this
to a better place to increase readability. Also because we are
allocating zeroed memory 'memset' statement is not needed at all.
Condition for checking for a valid gpio id is wrong and it should
be greater or equal instead of only greater so update to be the
good one.
Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Reviewed-by: NeilBrown <neil@brown.name>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Interrupt related stuff for gpio controller in mt7621 was missing
in device tree documentation. Add it to complete documentation for
this driver.
Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Reviewed-by: NeilBrown <neil@brown.name>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Gpio driver have a some globals which can be avoided just
using platform_data in a proper form. This commit adds a new
struct mtk_data which includes all of those globals setting them
using platform_set_drvdata and devm_gpiochip_add_data functions.
With this properly set we are able to retrieve driver data along
the code using kernel api's so globals are not needed anymore.
Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Reviewed-by: NeilBrown <neil@brown.name>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Gpio driver is using mtk and there is already 'mediatek' binding
defined for this maker. Update driver to use it instead the custom
one 'mtk'.
Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Reviewed-by: NeilBrown <neil@brown.name>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit add missing dt bindings documentation for mt7621-gpio
driver. There is some missing stuff here about interrupts with is
not also being used in the mt7621.dtsi file. So just include in
staging a incomplete version before moving this to kernel's dt-bindings
place.
Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Reviewed-by: NeilBrown <neil@brown.name>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
It's good to have SPDX identifiers in driver files to make it easier to
audit the kernel tree for correct licenses.
Fix up the one of staging gpio-mt7621 file to have a proper SPDX
identifier, based on the license text in the file itself. The SPDX
identifier is a legally binding shorthand, which can be used instead of
the full boiler plate text.
Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Reviewed-by: NeilBrown <neil@brown.name>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This patch silence some complains of checkpatch script because
of the use of long lines.
Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Reviewed-by: NeilBrown <neil@brown.name>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit replaces some bare unsigned definitions in some
function parameters in favour of 'unsigned int' which is
preferred.
This also fix checkpatch warnings about this.
Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Reviewed-by: NeilBrown <neil@brown.name>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
GPIO drivers should include <linux/gpio/driver.h> only, the
<linux/gpio.h> header is deprecated.
Cc: John Crispin <john@phrozen.org>
Cc: Zhiyong Tao <zhiyong.tao@mediatek.com>
Cc: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Fixes the following sparse warning:
drivers/staging/mt7621-gpio/gpio-mt7621.c:47:3: warning:
symbol 'gc_map' was not declared. Should it be static?
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Remove the reduntant owner initialization from this platform driver as
the platform_driver_register() takes care of it.
Signed-off-by: HariPrasath Elango <hariprasath.elango@gmail.com>
Reviewed-by: NeilBrown <neil@brown.name>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
