Currently we already have two pin configuration related callbacks
available for GPIO chips .set_single_ended() and .set_debounce(). In
future we expect to have even more, which does not scale well if we need
to add yet another callback to the GPIO chip structure for each possible
configuration parameter.
Better solution is to reuse what we already have available in the
generic pinconf.
To support this, we introduce a new .set_config() callback for GPIO
chips. The callback takes a single packed pin configuration value as
parameter. This can then be extended easily beyond what is currently
supported by just adding new types to the generic pinconf enum.
If the GPIO driver is backed up by a pinctrl driver the GPIO driver can
just assign gpiochip_generic_config() (introduced in this patch) to
.set_config and that will take care configuration requests are directed
to the pinctrl driver.
We then convert the existing drivers over .set_config() and finally
remove the .set_single_ended() and .set_debounce() callbacks.
Suggested-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Use the new gpiochip_irqchip_add_nested() and
gpiochip_set_nested_irqchip() calls to properly created
a nested irqchip and mark all child irqs properly with
their parent IRQ.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This fixes a problem where sx150x_regmap_reg_width() returns 8 for the
data register (reg 0) for sx1504 where it should return 4, and return
a correct 8 for sx1505 but for the wrong reason (both chips lack the
'advanced' register). This is not a real problem, since nothing depends
on the function returning 4 or 8, and certainly not if it is returning
8 for the wrong reason. But fix this to avoid nasty surprises down the
line.
Signed-off-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This matches the datasheets and is less confusing since the register
has nothing to with advancing anything.
Signed-off-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
The code assumes 8-bit or 16-bit width registers, but three of the
chips (sx1501/sx1504/sx1507) are 4-bit. So, try to handle 4-bit chips as
well, they leave the high part of each register unused.
Signed-off-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
All other registers on these chips are 8-bit, but reg_sense is 16-bits
and therefore needs to be moved down one notch.
This was apparently overlooked in the conversion to regmap, which only
updated the register locations for the 16-bit chips.
Fixes: 6489677f86 ("pinctrl-sx150x: Replace sx150x_*_cfg by means of regmap API")
Signed-off-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
If the chip does not have an oscio pin, all pins are configured in
the same regmap register making it trivial to update all pins at
once, so do that. If an oscio pin is present, there needs to be
more locking in place to handle all cases correctly, so this is
skipped.
Signed-off-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Include <linux/gpio/driver.h> rather than <linux/gpio.h>
Drop <linux/pinctrl/machine.h>.
Cc: Andrey Smirnov <andrew.smirnov@gmail.com>
Cc: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Althought the function passed as a "handler" during GPIO chip
instantiation is not going to ever be called, specifying handle_edge_irq
there makes for a rather confusing read, both because no "ack" callback
in specified for irqchip and because there's no acking action is
necessary.
Specify handle_bad_irq instead a make a note of the situation. This
commit should be a no-op behaviour wise.
Tested-by: Neil Armstrong <narmstrong@baylibre.com>
Acked-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Make use of for_each_set_bit macro and reduce boilerplate code.
Tested-by: Neil Armstrong <narmstrong@baylibre.com>
Acked-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Move actual code that configures oscio pin into a separate function and
use it instead of calling sx150x_gpio_set to avoid calling
sx150x_pin_is_oscio twice and correctly propagte error code in
sx150x_gpio_direction_output.
Tested-by: Neil Armstrong <narmstrong@baylibre.com>
Acked-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Gpiochip and irqchip aspects of this driver do not access any shared
registers on the chip itself and atomicity of various regmap operations
is ensured by that API's implementation, so there doesn't seem to be a
reason to hold the lock in as many places as it is held now.
Tested-by: Neil Armstrong <narmstrong@baylibre.com>
Acked-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
The difference between 8 and 16 pin GPIO expanders can be accomodated by
the means of regmap API without resorting to using driver-specific
read/write accessors. This change, IMHO, brings the following benefits:
- Replaces driver's idiosyncratic way of dealing with
mult-register fields with regmap API, which, hopefuly,
makes the code a bit easier for a new reader to understand
- Removes various multi-read for-loop register read logic
from various places in the code and puts it in a signle
place
- Removes ad-hoc IRQ register caching code in
sx150x_irq_bus_sync_unlock, since that functionality is
provided by regmap
Besided aforementioned benefits this change also implements necessary
RegSense byte swap necessary for SX1503 and SX1506 variants of the chip.
Tested-by: Neil Armstrong <narmstrong@baylibre.com>
Acked-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
For Sx1504/5/6 only SX1506 has RegAdvanced, so put some code in place to
account for that.
Tested-by: Neil Armstrong <narmstrong@baylibre.com>
Acked-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Move the code configuring explicit IRQ acking into a standalone function
to declutter sx150x_init_hw a bit and make that code somewhat less
repetitious.
Tested-by: Neil Armstrong <narmstrong@baylibre.com>
Acked-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
According to the datasheet for SX1504/5/6, RegAdvanced's
"Autoclear NINT" bit that turns the feature when set and disables it
when cleared, so writing 0x04 to the register will have the opposite
from desirable effect.
Tested-by: Neil Armstrong <narmstrong@baylibre.com>
Acked-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Add proper device specific information to of_device_id table of the
driver and add code to match against and fetch said data from it.
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Since the I2C sx150x GPIO expander driver uses platform_data to manage
the pins configurations, rewrite the driver as a pinctrl driver using
pinconf to get/set pin configurations from DT or debugfs.
The pinctrl driver is functionnally equivalent as the gpio-only driver
and can use DT for pinconf. The platform_data confirmation is dropped.
This patchset removed the gpio-only driver and selects the Pinctrl driver
config instead. This patchset also migrates the gpio dt-bindings to pinctrl
and add the pinctrl optional properties.
The driver was tested with a SX1509 device on a BeagleBone black with
interrupt support and on an X86_64 machine over an I2C to USB converter.
This is a fixed version that builds and runs on non-OF platforms and on
arm based OF. The GPIO version is removed and the bindings are also moved
to the pinctrl bindings.
Changes since v2
- rebased on v4.9-rc1
- removed MODULE_DEVICE_TABLE as in upstream bb411e771b
("gpio: sx150x: fix implicit assumption module.h is present")
Changes since v1
- Fix Kconfig descriptions on pinctrl and gpio
- Fix Kconfig dependency
- Remove oscio support for non-789 devices
- correct typo in dt bindings
- remove probe reset for non-789 devices
Changes since RFC
- Put #ifdef CONFIG_OF/CONFIG_OF_GPIO to remove OF code for non-of platforms
- No more rely on OF_GPIO config
- Moved and enhanced bindings to pinctrl bindings
- Removed gpio-sx150x.c
- Temporary select PINCTRL_SX150X when GPIO_SX150X
- Temporary mark GPIO_SX150X as deprecated
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Tested-by: Peter Rosin <peda@axentia.se>
Acked-by: Rob Herring <robh@kernel.org>
ested-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Mika Westerberg