Hi All, On 17/04/20 10:00 AM, Lokesh Vutla wrote: > This series adds support for an userpace utility to sync a pwm with PTP > clock. This can be used only on a specific hardware configutaion: > - A PTP supporting IP that is not capable of generating PPS signal > - A PWM signal that is connected to the above PTP hardware > - On every rising edge of PWM, PTP hardware should be able to send > the current timestamp to userspace. > - This PWM signal can be used as a PPS signal that is synchronized to > PTP clock. > > There are already 2 existing proven solutions to generate a PPS on > BeagleBoneBlack: > - [0]: Changing the PWM registers directly in userspce > - [1]: Changing the PWM registers directly in CPTS driver > Neither of the above solutions are accceptable in upstream as the PWM > accesses are not legitimate in the both of them. > > The userspace utility that this series introduces is highly derived > from the above two solutions and making legitimate calls. I am sure > there must be few things I might be missing while implementing it, > any feedback on it is much appreciated :) > > Following dependencies are needed in kernel for testing: > - Grygorii's series to support HW_TS_PUSH[2] > - Add pwm node in BBB DT. > All dependencies are available at[3].
Ping on this series. Any comments are much appreciated. Thanks and regards, Lokesh > > [0] https://usermanual.wiki/Document/SetupGuide.632280828.pdf > https://github.com/t-tibor/msc_thesis > [1] > https://git.ti.com/cgit/processor-sdk/processor-sdk-linux/commit/drivers/net/ethernet/ti/cpts.c?h=processor-sdk-linux-4.19.y&id=5e1a483eddc1b8dfd6df7183fa9216224aecae11 > [2] https://patchwork.kernel.org/project/linux-omap/list/?series=259523 > [3] https://github.com/lokeshvutla/linux.git devel/bbb-pps-generation > > > Lokesh Vutla (3): > phc: Add helper apis to control external timestamps on ptp device > pwm: Add helper apis to control pwm > phc2pwm: Introduce an utility to sync pwm with PTP clock > > makefile | 8 +- > phc.c | 48 +++++++++++ > phc.h | 29 +++++++ > phc2pwm.c | 233 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ > pwm.c | 223 +++++++++++++++++++++++++++++++++++++++++++++++++++ > pwm.h | 80 +++++++++++++++++++ > 6 files changed, 618 insertions(+), 3 deletions(-) > create mode 100644 phc2pwm.c > create mode 100644 pwm.c > create mode 100644 pwm.h > _______________________________________________ Linuxptp-devel mailing list Linuxptp-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linuxptp-devel
