Many users (and some applications) are expecting the CPU clock speed to be output in /proc/cpuinfo (as is done in x86, avr32, c6x, tile, parisc, ia64, and xtensa). This can be trivially added by simply querying the clock described in the CPU node of the device tree. It appears that many of the DTSI files in arch/arm/boot/dts already have this defined. So, this will add this desired functionality for many boards with already existing information. For those that do not have this defined, it will simply not output the string in question (thus keeping everything the same as before).
The output was modeled after x86 (based on number of significant digits and location in the output), but is similar to other architectures. For example, the output on my local board looks like: # cat /proc/cpuinfo processor : 0 model name : ARMv7 Processor rev 0 (v7l) cpu MHz : 1200.000 BogoMIPS : 1200.00 Features : half thumb fastmult vfp edsp thumbee neon vfpv3 tls vfpd32 CPU implementer : 0x41 CPU architecture: 7 CPU variant : 0x3 CPU part : 0xc09 CPU revision : 0 processor : 1 model name : ARMv7 Processor rev 0 (v7l) cpu MHz : 1200.000 BogoMIPS : 1200.00 Features : half thumb fastmult vfp edsp thumbee neon vfpv3 tls vfpd32 CPU implementer : 0x41 CPU architecture: 7 CPU variant : 0x3 CPU part : 0xc09 CPU revision : 0 Hardware : Broadcom Northstar Plus SoC Revision : 0000 Serial : 0000000000000000 Thanks, Jon Jon Mason (1): ARM: print MHz in /proc/cpuinfo arch/arm/kernel/setup.c | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) -- 1.9.1
