The .remove() callback for a platform driver returns an int which makes
many driver authors wrongly assume it's possible to do error handling by
returning an error code. However the value returned is ignored (apart
from emitting a warning) and this typically results in resource leaks.
To improve here there is a quest to make the remove callback return
void. In the first step of this quest all drivers are converted to
.remove_new(), which already returns void. Eventually after all drivers
are converted, .remove_new() will be renamed to .remove().
Trivially convert this driver from always returning zero in the remove
callback to the void returning variant.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Thierry Reding <treding@nvidia.com>
Acked-by: Dipen Patel <dipenp@nvidia.com>
Signed-off-by: Dipen Patel <dipenp@nvidia.com>
The changes for the hte/timestamp subsystem include the following:
- Improve comments in the translate function
- Reflect the GPIOLIB API changes during calculation of the GPIO base
- Improve error handling in Tegra test and provider drivers
- Improve code to set the line name
-----BEGIN PGP SIGNATURE-----
iIgEABYIADAWIQT4slW2T0Q/rXAa29f4pUxhzZTZKAUCZTwqPxIcZGlwZW5wQG52
aWRpYS5jb20ACgkQ+KVMYc2U2SjMGgD/R7vxDtV3Ik+YyYnjGmMPOoB1foNy+XKr
dJUY/SWKoHwBAOUuDPrj/Mg6aaIst5nZcEOyveWmKck0wb0LRsC9TcsL
=/8rI
-----END PGP SIGNATURE-----
Merge tag 'for-6.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/pateldipen1984/linux
Pull hte/timestamp updates from Dipen Patel:
- Improve comments in the translate function
- Reflect the GPIOLIB API changes during calculation of the GPIO base
- Improve error handling in Tegra test and provider drivers
- Improve code to set the line name
* tag 'for-6.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/pateldipen1984/linux:
hte: Use kasprintf() instead of fixed buffer formatting
hte: tegra: Fix missing error code in tegra_hte_test_probe()
hte: tegra194: Switch to LATE_SIMPLE_DEV_PM_OPS()
hte: tegra194: Remove redundant dev_err()
hte: tegra194: improve the GPIO-related comment
hte: allow building modules with COMPILE_TEST enabled
hte: Annotate struct hte_device with __counted_by
Improve readability and maintainability by replacing a hardcoded string
allocation and formatting by the use of the kasprintf() helper.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Dipen Patel <dipenp@nvidia.com>
Signed-off-by: Dipen Patel <dipenp@nvidia.com>
The value of 'ret' is zero when of_hte_req_count() fails to get number
of entitties to timestamp. And returning success(zero) on this failure
path is incorrect.
Fixes: 9a75a7cd03 ("hte: Add Tegra HTE test driver")
Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@oracle.com>
Reviewed-by: Dipen Patel <dipenp@nvidia.com>
Signed-off-by: Dipen Patel <dipenp@nvidia.com>
The driver started calling into a few interfaces that are part of GPIOLIB and
don't have stub implementations otherwise:
drivers/hte/hte-tegra194.c: In function 'tegra_hte_line_xlate':
drivers/hte/hte-tegra194.c:424:48: error: implicit declaration of function 'gpio_device_get_base'; did you mean 'gpio_device_get_desc'? [-Werror=implicit-function-declaration]
424 | line_id = desc->attr.line_id - gpio_device_get_base(gs->gdev);
| ^~~~~~~~~~~~~~~~~~~~
| gpio_device_get_desc
Add a Kconfig dependency to only allow building when this is defined.
Fixes: dc850faa28 ("hte: tegra194: don't access struct gpio_chip")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Dipen Patel <dipenp@nvidia.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Using struct gpio_chip is not safe as it will disappear if the
underlying driver is unbound for any reason. Switch to using reference
counted struct gpio_device and its dedicated accessors.
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Tested-by: Dipen Patel <dipenp@nvidia.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
[andy: used gpio_device_find_by_fwnode()]
Reviewed-by: Dipen Patel <dipenp@nvidia.com>
Link: https://lore.kernel.org/r/20231010151709.4104747-3-andriy.shevchenko@linux.intel.com
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
SET_LATE_SYSTEM_SLEEP_PM_OPS is deprecated, replace it with
LATE_SYSTEM_SLEEP_PM_OPS() and use pm_sleep_ptr() for setting
the driver's pm routines. We can now remove the __maybe_unused
qualifier in the suspend and resume functions.
Tested-by: Dipen Patel <dipenp@nvidia.com>
Reviewed-by: Dipen Patel <dipenp@nvidia.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20231010151709.4104747-5-andriy.shevchenko@linux.intel.com
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Dipen Patel <dipenp@nvidia.com>
There is no need to call the dev_err() function directly to print a custom
message when handling an error from platform_get_irq() function as it is
going to display an appropriate error message in case of a failure.
Reviewed-by: Dipen Patel <dipenp@nvidia.com>
Tested-by: Dipen Patel <dipenp@nvidia.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20231010151709.4104747-4-andriy.shevchenko@linux.intel.com
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Dipen Patel <dipenp@nvidia.com>
Using any of the GPIO interfaces using the global numberspace is
deprecated. Make it clear in the comment.
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Dipen Patel <dipenp@nvidia.com>
Signed-off-by: Dipen Patel <dipenp@nvidia.com>
Prepare for the coming implementation by GCC and Clang of the __counted_by
attribute. Flexible array members annotated with __counted_by can have
their accesses bounds-checked at run-time checking via CONFIG_UBSAN_BOUNDS
(for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
functions).
As found with Coccinelle[1], add __counted_by for struct hte_device.
[1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
Cc: Dipen Patel <dipenp@nvidia.com>
Cc: timestamp@lists.linux.dev
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Reviewed-by: Dipen Patel <dipenp@nvidia.com>
Reviewed-by: Justin Stitt <justinstitt@google.com>
Signed-off-by: Dipen Patel <dipenp@nvidia.com>
The DT of_device.h and of_platform.h date back to the separate
of_platform_bus_type before it was merged into the regular platform bus.
As part of that merge prepping Arm DT support 13 years ago, they
"temporarily" include each other. They also include platform_device.h
and of.h. As a result, there's a pretty much random mix of those include
files used throughout the tree. In order to detangle these headers and
replace the implicit includes with struct declarations, users need to
explicitly include the correct includes.
Acked-by: Dipen Patel <dipenp@nvidia.com>
Link: https://lore.kernel.org/r/20230714174600.4057041-1-robh@kernel.org
Signed-off-by: Rob Herring <robh@kernel.org>
The test driver uses the gpiod consumer API so include the right
<linux/gpio/consumer.h> header. This may cause a problem with
struct of_device_id being implcitly pulled in by the legacy
header <linux/gpio.h> so include <linux/mod_devicetable.h>
explicitly as well.
While at it, drop explicit moduleparam.h (it's included with module.h)
and sort the headers.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Dipen Patel <dipenp@nvidia.com>
Signed-off-by: Dipen Patel <dipenp@nvidia.com>
The "map_sz" is the number of elements in the "m" array so the >
comparison needs to be changed to >= to prevent an out of bounds
read.
Fixes: 09574cca6a ("hte: Add Tegra194 HTE kernel provider")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Acked-by: Dipen Patel <dipenp@nvidia.com>
Signed-off-by: Dipen Patel <dipenp@nvidia.com>
Without the extra #include, this driver produces a build failure
in some configurations.
drivers/hte/hte-tegra194-test.c:96:34: error: array type has incomplete element type 'struct of_device_id'
96 | static const struct of_device_id tegra_hte_test_of_match[] = {
Fixes: 9a75a7cd03 ("hte: Add Tegra HTE test driver")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Dipen Patel <dipenp@nvidia.com>
Signed-off-by: Dipen Patel <dipenp@nvidia.com>
It is preferred to use typed property access functions (i.e.
of_property_read_<type> functions) rather than low-level
of_get_property/of_find_property functions for reading properties. As
part of this, convert of_get_property/of_find_property calls to the
recently added of_property_present() helper when we just want to test
for presence of a property and nothing more.
Signed-off-by: Rob Herring <robh@kernel.org>
Acked-by: Dipen Patel <dipenp@nvidia.com>
Signed-off-by: Dipen Patel <dipenp@nvidia.com>
The dt binding adds nvidia,gpio-controller property from Tegra234 SoC
onwards to simplify code handling gpio chip search. The gpio chip search
is needed for the AON GPIO GTE instances to map the hardware timestamp
GPIO request (coming from the GPIO framework) to the tegra HTE
providers. The patch also adds new gpio chip match function to match
from the fwnode instead of the gpio controller label. The addition
of the property does not break ABI for the existing Tegra194 code.
Signed-off-by: Dipen Patel <dipenp@nvidia.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
The relevant DT bindings deprecates nvidia,slices property from
Tegra234 SoC onwards, moving the slices value per SoC data structure
instead.
Signed-off-by: Dipen Patel <dipenp@nvidia.com>
The Tegra234 AON GPIO instance and LIC IRQ support HTE. For the GPIO
HTE support, it also requires to add mapping between GPIO and HTE
framework same as it was done with Tegra194 SoC.
Signed-off-by: Dipen Patel <dipenp@nvidia.com>
The "free_name" variable is sometimes used without being initialized.
Fixes: 31ab09b421 ("drivers: Add hardware timestamp engine (HTE) subsystem")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Dipen Patel <dipenp@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
The &chip->gdev->ei[] array has chip->nlines elements so this >
comparison needs to be >= to prevent an out of bounds access. The
gdev->ei[] array is allocated in hte_register_chip().
Fixes: 31ab09b421 ("drivers: Add hardware timestamp engine (HTE) subsystem")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Dipen Patel <dipenp@nvidia.com>
Acked-by: Dipen Patel <dipenp@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
del_timer() does not wait until the timer handler finishing.
This means that the timer handler may still be running after
the driver's remove function has finished, which would result
in a use-after-free.
Fix it by calling del_timer_sync(), which makes sure the timer
handler has finished.
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Reviewed-by: Dipen Patel <dipenp@nvidia.com>
Acked-by: Dipen Patel <dipenp@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
The test driver uses IRQ and GPIO lines to timestamp using HTE
subsystem. The patch also adds compilation support in Kconfig and
Makefile.
Signed-off-by: Dipen Patel <dipenp@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Tegra194 device has multiple HTE instances also known as GTE (Generic
Hardware Timestamping Engine) which can timestamp subset of SoC lines
and signals. This provider driver focuses on IRQ and GPIO lines and
exposes timestamping ability on those lines to the consumers through
HTE subsystem.
Also, with this patch, added:
- documentation about this provider and its capabilities at
Documentation/hte.
- Compilation support in Makefile and Kconfig
Signed-off-by: Dipen Patel <dipenp@nvidia.com>
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Some devices can timestamp system lines/signals/Buses in real-time
using the hardware counter or other hardware means which can give
finer granularity and help avoid jitter introduced by software
timestamping. To utilize such functionality, this patchset creates
HTE subsystem where devices can register themselves as providers so
that the consumers devices can request specific line from the
providers. The patch also adds compilation support in Makefile and
menu options in Kconfig.
The provider does following:
- Registers chip with the framework.
- Provides translation hook to convert logical line id.
- Provides enable/disable, request/release callbacks.
- Pushes timestamp data to HTE subsystem.
The consumer does following:
- Initializes line attribute.
- Gets HTE timestamp descriptor.
- Requests timestamp functionality.
- Puts HTE timestamp descriptor.
Signed-off-by: Dipen Patel <dipenp@nvidia.com>
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
