- 25 May, 2020 2 commits
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Andy Shevchenko authored
platform_get_irq() will generate an error message if the requested IRQ is not present. Use platform_get_irq_optional() to avoid the error message being generated. Signed-off-by:
Andy Shevchenko <andriy.shevchenko@linux.intel.com> Tested-by:
Serge Semin <fancer.lancer@gmail.com> Reviewed-by:
Linus Walleij <linus.walleij@linaro.org>
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Andy Shevchenko authored
Add missed acpi_gpiochip_free_interrupts() call when unregistering ports. While at it, drop extra check to call acpi_gpiochip_request_interrupts(). There is no need to have an additional check to call acpi_gpiochip_request_interrupts(). Even without any interrupts available the registered ACPI Event handlers can be useful for debugging purposes. Fixes: e6cb3486 ("gpio: dwapb: add gpio-signaled acpi event support") Signed-off-by:
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- 18 May, 2020 12 commits
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Linus Walleij authored
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Geert Uytterhoeven authored
Add a maintainership section for the GPIO Aggregator, covering documentation and driver source code. Signed-off-by:
Geert Uytterhoeven <geert+renesas@glider.be> Tested-by:
Eugeniu Rosca <erosca@de.adit-jv.com> Reviewed-by:
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Geert Uytterhoeven authored
Document the GPIO Aggregator, and the two typical use-cases. Signed-off-by:
Ulrich Hecht <uli+renesas@fpond.eu> Reviewed-by:
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Geert Uytterhoeven authored
GPIO controllers are exported to userspace using /dev/gpiochip* character devices. Access control to these devices is provided by standard UNIX file system permissions, on an all-or-nothing basis: either a GPIO controller is accessible for a user, or it is not. Currently no mechanism exists to control access to individual GPIOs. Hence add a GPIO driver to aggregate existing GPIOs, and expose them as a new gpiochip. This supports the following use cases: - Aggregating GPIOs using Sysfs This is useful for implementing access control, and assigning a set of GPIOs to a specific user or virtual machine. - Generic GPIO Driver This is useful for industrial control, where it can provide userspace access to a simple GPIO-operated device described in DT, cfr. e.g. spidev for SPI-operated devices. Signed-off-by: -
Geert Uytterhoeven authored
Currently a GPIO lookup table can only refer to a specific GPIO by a tuple, consisting of a GPIO controller label and a GPIO offset inside the controller. However, a GPIO may also carry a line name, defined by DT or ACPI. If present, the line name is the most use-centric way to refer to a GPIO. Hence add support for looking up GPIOs by line name. Note that there is no guarantee that GPIO line names are globally unique, so this will use the first match found. Implement this by reusing the existing gpiod_lookup infrastructure. Rename gpiod_lookup.chip_label to gpiod_lookup.key, to make it clear that this field can have two meanings, and update the kerneldoc and GPIO_LOOKUP*() macros. Signed-off-by:
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Geert Uytterhoeven authored
i801_add_mux() fills in the GPIO lookup table by manually populating an array of gpiod_lookup structures. Use the existing GPIO_LOOKUP_IDX() helper macro instead, to relax a dependency on the gpiod_lookup structure's member names. Signed-off-by:
Lee Jones <lee.jones@linaro.org> Link: https://lore.kernel.org/r/20200511145257.22970-3-geert+renesas@glider.beSigned-off-by:
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Geert Uytterhoeven authored
i801_add_mux() fills in the GPIO lookup table by manually populating an array of gpiod_lookup structures. Use the existing GPIO_LOOKUP() helper macro instead, to relax a dependency on the gpiod_lookup structure's member names. Signed-off-by:
Jean Delvare <jdelvare@suse.de> Link: https://lore.kernel.org/r/20200511145257.22970-2-geert+renesas@glider.beSigned-off-by:
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Andy Shevchenko authored
There is no need to have an additional check to call acpi_gpiochip_request_interrupts(). Even without any interrupts available the registered ACPI Event handlers can be useful for debugging purposes. Signed-off-by:
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Andy Shevchenko authored
Allow driver to be built with COMPILE_TEST for better test coverage. Signed-off-by:
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Andy Shevchenko authored
There is nothing in the driver requires OF_GPIO. Moreover, driver supports ACPI and OF_GPIO may be a quite overhead on such configurations. Drop dependency for good and replace of_gpio.h to of.h since we have one function to be defined from there. Signed-off-by:
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Andy Shevchenko authored
acpi_gpiochip_request_interrupts() will check for ACPI handle of the GPIO chip parent device and bail out if there is none defined. Thus, has_acpi_companion() is effectively repeating above and is not needed in the individual driver. Assigning ->to_irq() unconditionally doesn't change anything, except an error code, but this we fix as well by propagating it from platform_get_irq(). Signed-off-by:
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Andy Shevchenko authored
Simplify the code which fetches the input clock by using devm_clk_get_optional(). If no input clock is present devm_clk_get_optional() will return NULL instead of an error which matches the behavior of the old code. Signed-off-by:
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- 16 May, 2020 1 commit
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Geert Uytterhoeven authored
gpiochip_set_desc_names() no longer rejects GPIO line name collisions. Hence GPIO line names are not guaranteed to be globally unique. In case of multiple GPIO lines with the same name, gpio_name_to_desc() will return the first match found. Update the comments for gpio_name_to_desc() and gpiochip_set_desc_names() to match reality. Fixes: f881bab0 ("gpio: keep the GPIO line names internal") Signed-off-by:
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- 12 May, 2020 1 commit
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Linus Walleij authored
Merge tag 'intel-gpio-v5.8-1' of git://git.kernel.org/pub/scm/linux/kernel/git/andy/linux-gpio-intel into devel intel-gpio for v5.8-1 * MSI support for Intel Merrifield * Refactor gpio-pch to be up-to-date with recent kernel APIs * Miscellaneous cleanups here and there The following is an automated git shortlog grouped by driver: ich: - fix a typo merrifield: - Better show how GPIO and IRQ bases are derived from hardware - Switch over to MSI interrupts pch: - Use in pch_irq_type() macros provided by IRQ core - Refactor pch_irq_type() to avoid unnecessary locking - Get rid of unneeded variable in IRQ handler - Use BIT() and GENMASK() where it's appropriate
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- 08 May, 2020 1 commit
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Linus Walleij authored
Merge tag 'gpio-updates-for-v5.8-part1' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux into devel gpio updates for v5.8-rc1 - part1 - correct the IRQ type used in to_irq() in gpio-xgene-sb - add new item to the TODO list - support building gpio-pl061 as module - improve pull-up/down support on GPIO expanders in device-tree - several improvements in gpio-pca953x - emit a warning for too long GPIO line names - add MODULE_DEVICE_TABLE to gpio-tegra186 - add support for new variant to gpio-f7188x - lsgpio can now display bias flags
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- 05 May, 2020 3 commits
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Kent Gibson authored
Add display of the bias flags. Signed-off-by:
Kent Gibson <warthog618@gmail.com> Signed-off-by:
Bartosz Golaszewski <bgolaszewski@baylibre.com>
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Petteri Jokinen authored
Add GPIO support for Fintek F81865 chip. Datasheet: http://www.hardwaresecrets.com/datasheets/F81865_V028P.pdfSigned-off-by:
Petteri Jokinen <petteri@kiho.fi> Signed-off-by:
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Mian Yousaf Kaukab authored
Export MODULE_DEVICE_TABLE since the driver can be built as a module. Signed-off-by:
Mian Yousaf Kaukab <ykaukab@suse.de> Signed-off-by:
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- 29 Apr, 2020 5 commits
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Douglas Anderson authored
When I copied the function prototypes from the GPIO header file into my own driver, checkpatch yelled at me saying that I shouldn't use use "unsigned" but instead should say "unsigned int". Let's make the header file use "unsigned int" so others who copy like I did won't get yelled at. Signed-off-by:
Douglas Anderson <dianders@chromium.org> Link: https://lore.kernel.org/r/20200428172322.2.Iacb3c8152c3cf9015a91308678155a578b0cc050@changeidSigned-off-by:
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Douglas Anderson authored
The legacy defines GPIOF_DIR_XXX are only for consumers. Document the proper ones. Also: don't use "_XXX" since that's harder to find with "git grep". Just list both of the values. Signed-off-by:
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Uwe Kleine-König authored
After the previous patch the two last parameters of pca953x_recalc_addr() are unused and so can be dropped. Tested-by:
Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by:
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Uwe Kleine-König authored
Some of the chips supported by the pca953x driver need the most significant bit in the address word set to automatically increment the address pointer on subsequent reads and writes (example: PCA9505). With this bit unset the same register is read multiple times on a multi-byte read sequence. Other chips must not have this bit set and autoincrement always (example: PCA9555). Up to now this AI bit was interpreted to be part of the address, which resulted in inconsistent regmap caching when a register was written with AI set and then read without it. This happened for the PCA9505 in pca953x_gpio_set_multiple() where pca953x_read_regs() bulk read from the cache for registers 0x8-0xc and then wrote to registers 0x88-0x8c. (Side note: reading 5 values from offset 0x8 yiels OP0 5 times because AI must be set to get OP0-OP4, which is another bug that is resolved here as a by-product.) The same problem happens when calls to gpio_set_value() and gpio_set_array_value() were mixed. With this patch the AI bit is always set for chips that support it. This works as there are no code locations that make use of the behaviour with AI unset (for the chips that support it). Note that the call to pca953x_setup_gpio() had to be done a bit earlier to make the NBANK macro work. The history of this bug is a bit complicated. Commit b32cecb4 ("gpio: pca953x: Extract the register address mangling to single function") changed which chips and functions are affected. Commit 3b00691c ("gpio: pca953x: hack to fix 24 bit gpio expanders") used some duct tape to make the driver at least appear to work. Commit 49427232 ("gpio: pca953x: Perform basic regmap conversion") introduced the caching. Commit b4818afe ("gpio: pca953x: Add set_multiple to allow multiple bits to be set in one write.") introduced the .set_multiple() callback which didn't work for chips that need the AI bit which was fixed later for some chips in 8958262a ("gpio: pca953x: Repair multi-byte IO address increment on PCA9575"). So I'm sorry, I don't know which commit I should pick for a Fixes: line. Tested-by:
Marcel Gudert <m.gudert@eckelmann.de> Signed-off-by:
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Andy Shevchenko authored
The commit 96d7c7b3 ("gpio: gpio-pca953x, Add get_multiple function") basically did everything wrong from style and code reuse perspective, i.e. - it didn't utilize existing PCA953x internal helpers - it didn't utilize bitmap API - it misses the point that ilog2(), besides that BANK_SFT is useless, can be used in macros - it has indentation issues. Rewrite the function completely. Cc: Paul Thomas <pthomas8589@gmail.com> Signed-off-by:
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- 28 Apr, 2020 7 commits
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Dejin Zheng authored
Fix a spelling typo in gpio-mm-lantiq.c by codespell s/dont/don't/ Cc: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by:
Dejin Zheng <zhengdejin5@gmail.com> Link: https://lore.kernel.org/r/20200424154103.10311-3-zhengdejin5@gmail.comSigned-off-by:
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Wei Yongjun authored
In case of error, the function devm_ioremap() returns NULL pointer not ERR_PTR(). The IS_ERR() test in the return value check should be replaced with NULL test. Signed-off-by:
Wei Yongjun <weiyongjun1@huawei.com> Link: https://lore.kernel.org/r/20200427110829.154785-1-weiyongjun1@huawei.comSigned-off-by:
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Dejin Zheng authored
Fix a spelling typo in gpio-ftgpio010.c by codespell s/desireable/desirable/ Cc: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by:
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Geert Uytterhoeven authored
Consistently use "gc" for "struct gpio *" variables. This follows the spirit of commit a0b66a73 ("gpio: Rename variable in core APIs"). Signed-off-by:
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Geert Uytterhoeven authored
Simplify the printing of kernel messages and make the messages more accurate by using the most appropriate {dev,chip,gpiod}_*() helpers. Sample impact: -gpiochip_setup_dev: registered GPIOs 496 to 511 on device: gpiochip0 (e6050000.gpio) +gpio gpiochip0: registered GPIOs 496 to 511 on e6050000.gpio -no flags found for gpios +gpio-953 (?): no flags found for gpios -GPIO line 355 (PCIE/SATA switch) hogged as output/low +gpio-355 (PCIE/SATA switch): hogged as output/low Signed-off-by: -
Andy Shevchenko authored
In some cases indentation makes code harder to read. Amend indentation in those cases despite of lines go a bit over 80 character limit. Signed-off-by:
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Andy Shevchenko authored
When we mask interrupts before sleep, there is no need to have a conjunction with 0xffffffff since the accepted by dwapb_write() value is 32-bit. Signed-off-by:
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- 24 Apr, 2020 1 commit
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Stephen Boyd authored
Some DT authors (including myself) have messed up the length of gpio-line-names and made it longer than it should be. Add a warning here so that developers can figure out that they've messed up their DT and should fix it. Cc: Alexandru M Stan <amstan@chromium.org> Signed-off-by:
Stephen Boyd <swboyd@chromium.org> Signed-off-by:
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- 17 Apr, 2020 7 commits
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YueHaibing authored
Remove including <linux/version.h> that don't need it. Signed-off-by:
YueHaibing <yuehaibing@huawei.com> Link: https://lore.kernel.org/r/20200408070832.137037-1-yuehaibing@huawei.comAcked-by:
Asmaa Mnebhi <Asmaa@mellanox.com> Signed-off-by:
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Andy Shevchenko authored
Split out dwapb_get_irq() helper for better readability and maintenance. Signed-off-by:
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Andy Shevchenko authored
Since we always have a table of IDs compiled in, there is no use for of_match_ptr() nor ACPI_PTR() call. Besides that it brings a warning (depending on configuration): .../gpio-dwapb.c:638:34: warning: ‘dwapb_of_match’ defined but not used [-Wunused-const-variable=] 638 | static const struct of_device_id dwapb_of_match[] = { | ^~~~~~~~~~~~~~ Get rid of them for good. Signed-off-by: -
Andy Shevchenko authored
There is no case when no context is provided in the ->suspend() and ->resume() hooks. Moreover, BUG_ON() is harmful to user and makes kernel inoperable after the crash. Drop the BUG_ON()s for good. Signed-off-by:
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Andy Shevchenko authored
More usual pattern is to prepare value and then write it in a single place. Switch code in dwapb_gpio_set_debounce() to it. Signed-off-by:
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Andy Shevchenko authored
IRQ core provides macros such as IRQ_RETVAL(). Convert code to use them. Signed-off-by:
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Andy Shevchenko authored
Use device_get_match_data() here to simplify the code a bit. Signed-off-by:
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