Clock driver linux

This code can be used for testing the real time clock driver developed for new Linux based platform. $ vim gettime.c /* * Test Code for Real Time Clock Driver * * Compile with: * gcc -s -Wall -Wstrict-prototypes gettime.c -o gettime * * This binary is a part of RTC test suite. Device Drivers Clock API Linux Kernel Low-level driver API Low-level clock management SW layer (low-level HW CGU access routines) /sysfs/clks dump clocks clk_get() clk_put() clk_enable() clk_disable() clk_set_rate() Middle-level clock management SW layer Linux Clock API implementation (clock reference counting + dependency resolving) User-level Linux . Real Time Clock (RTC) Drivers for Linux ¶. Real Time Clock (RTC) Drivers for Linux. When Linux developers talk about a “Real Time Clock”, they usually mean something that tracks wall clock time and is battery backed so that it works even with system power off. Such clocks will normally not track the local time zone or daylight savings time – unless they dual boot with MS .

Summary. ptp_vmw is a Linux driver for VMware Precision Clock, a new type of virtual device available in ESXi (hardware version 17 on-wards) that provides virtual machines with access to the underlying ESXi host's system clock. Guests can use the device as a reference clock in Chrony time synchronization software to synchronize their system clocks with. The clock framework is reentrant, in that a driver is allowed to call clock framework functions from within its implementation of clock operations. This can for instance cause www.doorway.ru_rate operation of one clock being called from within www.doorway.ru_rate operation of another clock. Clock drivers include include/linux/ptp_clock_kernel.h and register themselves by presenting a ‘struct ptp_clock_info’ to the registration method. Clock drivers must implement all of the functions in the interface. If a clock does not offer a particular ancillary feature, then the driver should just return -EOPNOTSUPP from those functions.

Real-Time Clock in Linux ###Two clocks are important in. As can be seen from the kernel boot log there are actually 3 RTC drivers active on Tegra based. All clock drivers, including the Jetson custom clk driver, implement clk_ops. Clock sources and clocks required by devices are defined in the Device Tree. The device driver for clock-generator uses something like the following To unsubscribe from this list: send the line "unsubscribe linux-kernel" in.