Commit Graph

1136040 Commits

Author SHA1 Message Date
Bartosz Golaszewski 533aae7c94 gpiolib: cdev: fix NULL-pointer dereferences
There are several places where we can crash the kernel by requesting
lines, unbinding the GPIO device, then calling any of the system calls
relevant to the GPIO character device's annonymous file descriptors:
ioctl(), read(), poll().

While I observed it with the GPIO simulator, it will also happen for any
of the GPIO devices that can be hot-unplugged - for instance any HID GPIO
expander (e.g. CP2112).

This affects both v1 and v2 uAPI.

This fixes it partially by checking if gdev->chip is not NULL but it
doesn't entirely remedy the situation as we still have a race condition
in which another thread can remove the device after the check.

Fixes: d7c51b47ac ("gpio: userspace ABI for reading/writing GPIO lines")
Fixes: 3c0d9c635a ("gpiolib: cdev: support GPIO_V2_GET_LINE_IOCTL and GPIO_V2_LINE_GET_VALUES_IOCTL")
Fixes: aad955842d ("gpiolib: cdev: support GPIO_V2_GET_LINEINFO_IOCTL and GPIO_V2_GET_LINEINFO_WATCH_IOCTL")
Fixes: a54756cb24 ("gpiolib: cdev: support GPIO_V2_LINE_SET_CONFIG_IOCTL")
Fixes: 7b8e00d981 ("gpiolib: cdev: support GPIO_V2_LINE_SET_VALUES_IOCTL")
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
2022-12-07 09:35:48 +01:00
Andy Shevchenko 3b7c7478ed gpiolib: Provide to_gpio_device() helper
Provide to_gpio_device() helper which can be utilized in the existing
and future code.

While at it, make sure it becomes no-op at compilation time.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
2022-11-29 14:52:20 +01:00
Andy Shevchenko 4ef339bc05 gpiolib: Unify access to the device properties
Some of the functions are using struct fwnode_handle, some struct device
pointer. In the GPIO library the firmware node of the GPIO device is the
same as GPIO node of the GPIO chip. Due to this fact we may use former
to access properties everywhere in the code.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Brian Masney <bmasney@redhat.com>
Tested-by: Marijn Suijten <marijn.suijten@somainline.org>
[Bartosz: stick to the 80-char limit where it's not hurting readability]
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
2022-11-28 19:00:32 +01:00
Christophe JAILLET 923d011feb gpio: Do not include <linux/kernel.h> when not really needed.
<linux/kernel.h> is included only for using container_of().
Include <linux/container_of.h> instead, it is much lighter.

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
2022-11-28 18:57:50 +01:00
Uwe Kleine-König 7963ba02b2 gpio: pcf857x: Convert to i2c's .probe_new()
.probe_new() doesn't get the i2c_device_id * parameter, so determine
that explicitly in the probe function.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
2022-11-24 09:22:10 +01:00
Uwe Kleine-König 1287341c19 gpio: pca953x: Convert to i2c's .probe_new()
.probe_new() doesn't get the i2c_device_id * parameter, so determine
that explicitly in the probe function.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
2022-11-24 09:22:00 +01:00
Uwe Kleine-König 8ac813f7e6 gpio: max732x: Convert to i2c's .probe_new()
.probe_new() doesn't get the i2c_device_id * parameter, so determine
that explicitly in the probe function.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
2022-11-24 09:21:51 +01:00
Bartosz Golaszewski 06fa87fc93 Merge branch 'i2c/client_device_id_helper-immutable' of https://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux into gpio/for-next
Introduce the i2c_client_get_device_id() helper.
2022-11-24 09:20:26 +01:00
Nishanth Menon 40059212f9 dt-bindings: gpio: gpio-davinci: Increase maxItems in gpio-line-names
gpio-line-names really depends on ti,ngpios. However, the maximum value
we have seen across the board is on K2G and da850 platforms where it can
be upto 144.

Link: https://lore.kernel.org/linux-arm-kernel/20221115200357.qa2rvw3clbz7unzq@symptom/T/#u
Fixes: c830b87a76 ("dt-bindings: gpio: gpio-davinci: Convert to json-schema")
Reported-by: Robert Nelson <robertcnelson@gmail.com>
Signed-off-by: Nishanth Menon <nm@ti.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
2022-11-16 10:23:21 +01:00
Bartosz Golaszewski 8fd3f7be33 intel-gpio for v6.2-1
* Miscellaneous updates to the core (cdev, acpi) and Intel Merrifield driver
 
 The following is an automated git shortlog grouped by driver:
 
 gpiolib:
  -  cdev: Fix typo in kernel doc for struct line
  -  acpi: Use METHOD_NAME__AEI macro for acpi_walk_resources
 
 merrifield:
  -  Use str_enable_disable() helper
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Merge tag 'intel-gpio-v6.2-1' of git://git.kernel.org/pub/scm/linux/kernel/git/andy/linux-gpio-intel into gpio/for-next

intel-gpio for v6.2-1

* Miscellaneous updates to the core (cdev, acpi) and Intel Merrifield driver

The following is an automated git shortlog grouped by driver:

gpiolib:
 -  cdev: Fix typo in kernel doc for struct line
 -  acpi: Use METHOD_NAME__AEI macro for acpi_walk_resources

merrifield:
 -  Use str_enable_disable() helper
2022-11-16 10:20:33 +01:00
Brian Masney 24c94060fc gpiolib: ensure that fwnode is properly set
Note that this is a RFC patch and not meant to be merged. I looked into
a problem with linux-next-20221110 on the Qualcomm SA8540P automotive
board (sc8280xp) where the UFS host controller would fail to probe due
to repeated probe deferrals when trying to get reset-gpios via
devm_gpiod_get_optional().

of_get_named_gpiod_flags() returns -EPROBE_DEFER, which is caused by
of_gpiochip_match_node_and_xlate() returning 0 since the of_xlate function
pointer is not set for the qcom,sc8280xp-tlmm pinctrl driver. The
pinctrl driver doesn't define one, so of_gpiochip_add() should
automatically setup of_gpio_simple_xlate() on it's behalf. This doesn't
happen since the fwnode member on the struct gpiochip is set to null
when of_gpiochip_add() is called. Let's work around this by ensuring
that it's set if available.

Note that this broke sometime within the last few weeks within
linux-next and I haven't bisected this. I'm posting this in the hopes
that someone may know offhand which patch(es) may have broken this.

Signed-off-by: Brian Masney <bmasney@redhat.com>
Tested-by: Marijn Suijten <marijn.suijten@somainline.org>
Tested-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Tested-by: Steev Klimaszewski <steev@kali.org> #Lenovo Thinkpad X13s
Tested-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
2022-11-16 10:19:09 +01:00
Aidan MacDonald 739be9b6a8 gpio: sl28cpld: Replace irqchip mask_invert with unmask_base
Remove use of the deprecated mask_invert flag. Inverted mask
registers (where a '1' bit enables an IRQ) can be described more
directly as an unmask register.

Signed-off-by: Aidan MacDonald <aidanmacdonald.0x0@gmail.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
2022-11-15 15:41:45 +01:00
Thierry Reding ddf07bd874 gpiolib: of: Use correct fwnode for DT-probed chips
The OF node store in chip->fwnode is used to explicitly override the FW
node for a GPIO chip. For chips that use the default FW node (i.e. that
of their parent device), this will be NULL and cause the chip not to be
fully registered.

Instead, use the GPIO device's FW node, which is set to either the node
of the parent device or the explicit override in chip->fwnode.

Fixes: 8afe825502 ("gpiolib: of: Prepare of_gpiochip_add() / of_gpiochip_remove() for fwnode")
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Tested-by: Robert Marko <robimarko@gmail.com>
Tested-by: Andrew Halaney <ahalaney@redhat.com>
Reviewed-by: Brian Masney <bmasney@redhat.com>
Tested-by: Brian Masney <bmasney@redhat.com>
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
2022-11-15 15:38:18 +01:00
Andy Shevchenko a431803852 gpiolib: of: Drop redundant check in of_mm_gpiochip_remove()
The callers never call the function with invalid pointer.
Moreover, compiler quite likely dropped that check anyway
because we use that pointer before the check.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
2022-11-15 11:53:13 +01:00
Andy Shevchenko 77289b2f5a gpiolib: of: Prepare of_mm_gpiochip_add_data() for fwnode
GPIO library is getting rid of of_node, fwnode should be utilized instead.
Prepare of_mm_gpiochip_add_data() for fwnode.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
2022-11-15 11:53:05 +01:00
Dmitry Torokhov e7f9ff5dc9 gpiolib: add support for software nodes
Now that static device properties understand notion of child nodes and
references, let's teach gpiolib to handle them:

- GPIOs are represented as a references to software nodes representing
  gpiochip
- references must have 2 arguments - GPIO number within the chip and
  GPIO flags (GPIO_ACTIVE_LOW/GPIO_ACTIVE_HIGH, etc)
- a new PROPERTY_ENTRY_GPIO() macro is supplied to ensure the above
- name of the software node representing gpiochip must match label of
  the gpiochip, as we use it to locate gpiochip structure at runtime

The following illustrates use of software nodes to describe a "System"
button that is currently specified via use of gpio_keys_platform_data
in arch/mips/alchemy/board-mtx1.c. It follows bindings specified in
Documentation/devicetree/bindings/input/gpio-keys.yaml.

static const struct software_node mxt1_gpiochip2_node = {
	.name = "alchemy-gpio2",
};

static const struct property_entry mtx1_gpio_button_props[] = {
	PROPERTY_ENTRY_U32("linux,code", BTN_0),
	PROPERTY_ENTRY_STRING("label", "System button"),
	PROPERTY_ENTRY_GPIO("gpios", &mxt1_gpiochip2_node, 7, GPIO_ACTIVE_LOW),
	{ }
};

Similarly, arch/arm/mach-tegra/board-paz00.c can be converted to:

static const struct software_node tegra_gpiochip_node = {
	.name = "tegra-gpio",
};

static struct property_entry wifi_rfkill_prop[] __initdata = {
	PROPERTY_ENTRY_STRING("name", "wifi_rfkill"),
	PROPERTY_ENTRY_STRING("type", "wlan"),
	PROPERTY_ENTRY_GPIO("reset-gpios",
			    &tegra_gpiochip_node, 25, GPIO_ACTIVE_HIGH);
	PROPERTY_ENTRY_GPIO("shutdown-gpios",
			    &tegra_gpiochip_node, 85, GPIO_ACTIVE_HIGH);
	{ },
};

static struct platform_device wifi_rfkill_device = {
	.name	= "rfkill_gpio",
	.id	= -1,
};

...

	software_node_register(&tegra_gpiochip_node);
	device_create_managed_software_node(&wifi_rfkill_device.dev,
					    wifi_rfkill_prop, NULL);

Acked-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
2022-11-15 11:21:43 +01:00
Dmitry Torokhov 8eb1f71e7a gpiolib: consolidate GPIO lookups
Ensure that all paths to obtain/look up GPIOD from generic
consumer-visible APIs go through the new gpiod_find_and_request()
helper, so that we can easily extend it with support for new firmware
mechanisms.

The only exception is OF-specific [devm_]gpiod_get_from_of_node() API
that is still being used by a couple of drivers and will be removed as
soon as patches converting them to use generic fwnode/device APIs are
accepted.

Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
2022-11-15 11:21:30 +01:00
Dmitry Torokhov b7452d670f gpiolib: acpi: avoid leaking ACPI details into upper gpiolib layers
There is no need for the generic parts of GPIOLIB to be aware of
implementation details of ACPI-bases lookups.

Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
2022-11-15 11:20:47 +01:00
Dmitry Torokhov 16ba046e86 gpiolib: acpi: teach acpi_find_gpio() to handle data-only nodes
In preparation of switching all ACPI-based GPIO lookups to go through
acpi_find_gpio() we need to make sure it can handle data-only ACPI
nodes, same as existing acpi_node_get_gpiod().

Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
2022-11-15 11:19:58 +01:00
Dmitry Torokhov 2b6bce80ae gpiolib: acpi: change acpi_find_gpio() to accept firmware node
In preparation of switching all ACPI-based GPIO lookups to go through
acpi_find_gpio() let's change it to accept device node as its argument
as we do not always have access to device structure.

Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
2022-11-15 11:19:40 +01:00
Dmitry Torokhov 07445ae1c2 gpiolib: of: change of_find_gpio() to accept device node
In preparation of switching all OF-based GPIO lookups to go through
of_find_gpio() let's change it to accept device node as its argument as
we do not always have access to device structure.

Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
2022-11-15 11:16:44 +01:00
Angel Iglesias 662233731d i2c: core: Introduce i2c_client_get_device_id helper function
Introduces new helper function to aid in .probe_new() refactors. In order
to use existing i2c_get_device_id() on the probe callback, the device
match table needs to be accessible in that function, which would require
bigger refactors in some drivers using the deprecated .probe callback.

This issue was discussed in more detail in the IIO mailing list.

Link: https://lore.kernel.org/all/20221023132302.911644-11-u.kleine-koenig@pengutronix.de/
Suggested-by: Nuno Sá <noname.nuno@gmail.com>
Suggested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Suggested-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Angel Iglesias <ang.iglesiasg@gmail.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
2022-11-14 20:49:33 +01:00
Guillaume La Roque 8dab99c9ea gpio: davinci: add support of module build
Added module build support for the davinci gpio driver

Signed-off-by: Guillaume La Roque <glaroque@baylibre.com>
Signed-off-by: Nicolas Frayer <nfrayer@baylibre.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
2022-11-10 15:24:34 +01:00
Andy Shevchenko 27043a7d50 gpiolib: of: Integrate of_gpiochip_init_valid_mask() into gpiochip_init_valid_mask()
In preparation to complete fwnode switch, integrate
of_gpiochip_init_valid_mask() into gpiochip_init_valid_mask().

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
2022-11-09 14:10:27 +01:00
Andy Shevchenko 8afe825502 gpiolib: of: Prepare of_gpiochip_add() / of_gpiochip_remove() for fwnode
GPIO library is getting rid of of_node, fwnode should be utilized instead.
Prepare of_gpiochip_add() / of_gpiochip_remove() for fwnode.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
2022-11-09 14:10:16 +01:00
Dmitry Torokhov 2fe8e1dcf9 gpiolib: remove devm_fwnode_get_[index_]gpiod_from_child()
Now that there are no more users of these APIs in the kernel we can
remove them.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
2022-11-09 13:59:32 +01:00
Dmitry Torokhov 17521f263f leds: lgm-sso: switch to using devm_fwnode_gpiod_get()
devm_fwnode_get_gpiod_from_child() is going away as the name is too
unwieldy, let's switch to using the new devm_fwnode_gpiod_get().

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
2022-11-09 13:59:28 +01:00
Dmitry Torokhov a055204b06 leds: gpio: switch to using devm_fwnode_gpiod_get()
devm_fwnode_get_gpiod_from_child() is going away as the name is too
unwieldy, let's switch to using the new devm_fwnode_gpiod_get().

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
2022-11-09 13:59:21 +01:00
Weilong Chen 80280df758 gpio: hisi: Add initial device tree support
Add support for HiSilicon GPIO controller in embedded platform, which
boot from devicetree.

Signed-off-by: Weilong Chen <chenweilong@huawei.com>
Acked-by: Jay Fang <f.fangjian@huawei.com>
Reviewed-by: Yicong Yang <yangyicong@hisilicon.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
2022-11-07 21:37:07 +01:00
Weilong Chen 95e7fc84c7 dt-bindings: gpio: add entry for hisilicon,ascend910-gpio
Add the new compatible for HiSilicon gpio controller driver.

Signed-off-by: Weilong Chen <chenweilong@huawei.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Yicong Yang <yangyicong@hisilicon.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
2022-11-07 21:36:29 +01:00
Andy Shevchenko c8a51f0350 gpio: Add Generic regmap GPIO conversion to the TODO list
It's actually preferable to use Generic regmap GPIO over other
simple approaches. Add a TODO item for that.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
2022-11-07 09:42:32 +01:00
Dmitry Torokhov b8b80348c5 gpiolib: of: add polarity quirk for Freescale PCIe controller
Bindings for Freescale PCIe controller use a separate property called
"reset-gpio-active-high" to control polarity of its reset line, add it
to the list of quirks in gpiolib so that gpiod API can be used in the
driver.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
2022-11-04 16:15:09 +01:00
Dmitry Torokhov 34cb9352b6 gpiolib: of: factor out quirk setting polarity via separate property
Several legacy bindings use a separate property to specify polarity of
GPIOs instead of specifying it directly in the GPIO property. Factor
out this code to make it easier to add more such cases.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
2022-11-04 16:14:58 +01:00
Andy Shevchenko d59fdbc716 gpiolib: of: Make use of device_match_of_node()
Make use of device_match_of_node() instead of open coding its
functionality.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
2022-11-04 16:10:56 +01:00
Shubhrajyoti Datta fbb19fe17e gpio: pca9570: add slg7xl45106 support
Dialog semiconductors SLG7XL45106 is an 8-bit I2C GPO expander.
The output port is controlled by a data byte with register
address. Add a compatible string for the same. Also update
the driver to write and read from it.

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@amd.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
2022-10-27 09:32:31 +02:00
Shubhrajyoti Datta b8a34582c7 gpio: pca9570: add a platform data structure
Add struct pca9570_platform_data for adding the platform data
structure. Also modify the existing structs for pca9570 and pca9571

Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@amd.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
2022-10-27 09:32:09 +02:00
Shubhrajyoti Datta f7ec74c14f dt-bindings: gpio: pca9570: Add compatible for slg7xl45106
This patch adds compatible string for the SLG7XL45106,
I2C GPO expander.

Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@amd.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
2022-10-27 09:21:46 +02:00
Andy Shevchenko b4e83d3690 gpio: exar: Allow IO port access
It's possible that PCI device can provide an IO port resource for
the device. regmap MMIO currently uses MMIO by default. With an
additional flag we enable support for IO port accesses.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: William Breathitt Gray <william.gray@linaro.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
2022-10-26 14:52:02 +02:00
Sascha Hauer 1454a928b6 gpio: Add gpio latch driver
This driver implements a GPIO multiplexer based on latches connected to
other GPIOs. A set of data GPIOs is connected to the data input of
multiple latches. The clock input of each latch is driven by another
set of GPIOs. With two 8-bit latches 10 GPIOs can be multiplexed into
16 GPIOs. GPOs might be a better term as in fact the multiplexed pins
are output only.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Reviewed-by: Serge Semin <fancer.lancer@gmail.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
[Bartosz: fixed the strange of_device_id formatting]
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
2022-10-26 14:52:01 +02:00
Sascha Hauer 2a903ca922 dt-bindings: gpio: Add gpio-latch binding document
This adds a binding for a GPIO multiplexer driver based on latches
connected to other GPIOs.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Serge Semin <fancer.lancer@gmail.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
2022-10-26 14:52:01 +02:00
Andy Shevchenko 8d25984724 gpiolib: cdev: Fix typo in kernel doc for struct line
When eflags has been renamed to the edflags, the kernel doc change were
missed. Update kernel doc accordingly.

Fixes: b1a92e9456 ("gpiolib: cdev: consolidate edge detector configuration flags")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Kent Gibson <warthog618@gmail.com>
2022-10-25 19:48:55 +03:00
Xiang Yang eac001bf4a gpiolib: acpi: Use METHOD_NAME__AEI macro for acpi_walk_resources
Using the METHOD_NAME__AEI macro instead of using "_AEI" directly.

Signed-off-by: Xiang Yang <xiangyang3@huawei.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
2022-10-25 19:47:12 +03:00
William Breathitt Gray e7f758fa9b gpio: pci-idio-16: Utilize the idio-16 GPIO library
The ACCES PCI-IDIO-16 device is part of the ACCES IDIO-16 family, so the
idio-16 GPIO library module is selected and utilized to consolidate
code.

Signed-off-by: William Breathitt Gray <william.gray@linaro.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
2022-10-25 09:58:27 +02:00
William Breathitt Gray c4ec384cf7 gpio: 104-idio-16: Utilize the idio-16 GPIO library
The ACCES 104-IDIO-16 device is part of the ACCES IDIO-16 family, so the
idio-16 GPIO library module is selected and utilized to consolidate
code.

Signed-off-by: William Breathitt Gray <william.gray@linaro.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
2022-10-25 09:57:57 +02:00
William Breathitt Gray b9b1fc1ae1 gpio: idio-16: Introduce the ACCES IDIO-16 GPIO library module
Exposes consumer library functions to facilitate communication with
devices within the ACCES IDIO-16 family such as the 104-IDIO-16 and
the PCI-IDIO-16.

A CONFIG_GPIO_IDIO_16 Kconfig option is introduced by this patch.
Modules wanting access to these idio-16 library functions should select
this Kconfig option and import the GPIO_IDIO_16 symbol namespace.

Cc: Andy Shevchenko <andriy.shevchenko@intel.com>
Signed-off-by: William Breathitt Gray <william.gray@linaro.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
2022-10-25 09:56:46 +02:00
Jeremy Kerr 6de0cb80e6 gpio: ftgpio010: use device name for gpiochip name & label
Currently, we use just the fixed string "FTGPIO010" as the gpiochip name
for ftgpio010 drivers. Because it's fixed, this means we cannot
distinguish multiple ftgpio010 devices present on a single system.

This change uses the dev_name() instead, which should be unique between
multiple instances.

Signed-off-by: Jeremy Kerr <jk@codeconstruct.com.au>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
2022-10-25 09:54:47 +02:00
Dmitry Torokhov 99d18d42c9 gpiolib: of: add a quirk for reset line polarity for Himax LCDs
Existing DTS that use legacy (non-standard) property name for the reset
line "gpios-reset" also specify incorrect polarity (0 which maps to
"active high"). Add a quirk to force polarity to "active low" so that
once driver is converted to gpiod API that pays attention to line
polarity it will work properly.

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
2022-10-20 13:57:54 +02:00
Dmitry Torokhov b02c85c945 gpiolib: of: add quirk for phy reset polarity for Freescale Ethernet
Bindings for Freescale Fast Ethernet Controller use a separate
property "phy-reset-active-high" to specify polarity of its phy
gpio line. To allow converting the driver to gpiod API we need
to add this quirk to gpiolib.

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
2022-10-20 13:57:43 +02:00
Dmitry Torokhov e3186e3692 gpiolib: of: factor out code overriding gpio line polarity
There are several instances where we use a separate property to
override polarity specified in gpio property. Factor it out into
a separate function.

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
2022-10-20 13:54:46 +02:00
Dmitry Torokhov eaf1a29665 gpiolib: of: add a quirk for legacy names in MOXA ART RTC
The driver is using non-standard "gpio-rtc-data", "gpio-rtc-sclk", and
"gpio-rtc-reset" names for properties describing its gpios. In
preparation to converting to the standard naming ("rtc-*-gpios") and
switching the driver to gpiod API add a quirk to gpiolib to keep
compatibility with existing DTSes.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
2022-10-20 13:54:18 +02:00