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2022-05-10hte: Fix possible use-after-free in tegra_hte_test_remove()Yang Yingliang1-1/+1
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>
2022-05-10hte: Remove unused including <linux/version.h>Jiapeng Chong1-1/+0
Eliminate the follow versioncheck warning: ./drivers/hte/hte-tegra194-test.c: 8 linux/version.h not needed. Reported-by: Abaci Robot <abaci@linux.alibaba.com> Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com> Reviewed-by: Dipen Patel <dipenp@nvidia.com> Acked-by: Dipen Patel <dipenp@nvidia.com> Signed-off-by: Thierry Reding <treding@nvidia.com>
2022-05-04MAINTAINERS: Add HTE SubsystemDipen Patel1-0/+8
Add myself as a maintainer for this new Hardware Timestamping Engine (HTE) subsystem. Signed-off-by: Dipen Patel <dipenp@nvidia.com> Signed-off-by: Thierry Reding <treding@nvidia.com>
2022-05-04hte: Add Tegra HTE test driverDipen Patel3-1/+247
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>
2022-05-04tools: gpio: Add new hardware clock typeDipen Patel1-1/+5
gpiolib-cdev is extended to support hardware clock type, this patch reflects that fact. Signed-off-by: Dipen Patel <dipenp@nvidia.com> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Thierry Reding <treding@nvidia.com>
2022-05-04gpiolib: cdev: Add hardware timestamp clock typeDipen Patel2-33/+222
This patch adds new clock type for the GPIO controller which can timestamp gpio lines in using hardware means. To expose such functionalities to the userspace, code has been added where during line create or set config API calls, it checks for new clock type and if requested, calls HTE API. During line change event, the HTE subsystem pushes timestamp data to userspace through gpiolib-cdev. Signed-off-by: Dipen Patel <dipenp@nvidia.com> Acked-by: Linus Walleij <linus.walleij@linaro.org> Reported-by: kernel test robot <lkp@intel.com> Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Thierry Reding <treding@nvidia.com>
2022-05-04gpio: tegra186: Add HTE supportDipen Patel1-1/+80
Tegra194 AON GPIO controller with the use of its internal hardware timestamping engine (HTE), also known as GTE, can timestamp GPIO lines through system counter. This patch implements enable/disable callbacks for the GPIO controller. In enable call, it will set timestamp function bit and GPIO line rising/falling edges in the config register. In disable call, it restores the state. Signed-off-by: Dipen Patel <dipenp@nvidia.com> Signed-off-by: Thierry Reding <treding@nvidia.com>
2022-05-04gpiolib: Add HTE supportDipen Patel4-2/+83
Some GPIO chip can provide hardware timestamp support on its GPIO lines , in order to support that, additional API needs to be added which can talk to both GPIO chip and HTE (hardware timestamping engine) providers if there is any dependencies. This patch introduces optional hooks to enable and disable hardware timestamping related features in the GPIO controller chip. Signed-off-by: Dipen Patel <dipenp@nvidia.com> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Thierry Reding <treding@nvidia.com>
2022-05-04dt-bindings: Add HTE bindingsDipen Patel3-0/+156
Introduces HTE devicetree binding details for the HTE subsystem. It includes examples for the consumers, binding details for the providers and specific binding details for the Tegra194 based HTE providers. Signed-off-by: Dipen Patel <dipenp@nvidia.com> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Thierry Reding <treding@nvidia.com>
2022-05-04hte: Add Tegra194 HTE kernel providerDipen Patel6-0/+815
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>
2022-05-04drivers: Add hardware timestamp engine (HTE) subsystemDipen Patel6-0/+1237
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>