2. Audio Playback setpoints : AHB is at 25MHz, AXI is at 50MHz and DDR is at
50MHz. This mode is used in audio playback mode.
3. Low Frequency setpoint: AHB is at 24MHz, AXI is at 24MHz and DDR is at 24MHz.
This mode is used when the system is idle waiting for user input (display is off).
To Enable the bus frequency driver, use the following command:
echo 1 > /sys/devices/platform/imx_busfreq.0/enable
To Disable the bus frequency driver, use the following command:
echo 0 > /sys/devices/platform/imx_busfreq.0/enable
21.1.3 Source Code Structure
Table below lists the source files and headers available in the following directory:
<ltib_dir>/rpm/BUILD/linux/arch/arm/mach-mx6
Table 21-1. BusFrequency Driver Files
File
Description
bus_freq.c
Bus Frequency functions
mx6_mmdc.c, mx6_ddr_freq.S
DDR frequency change functions
21.2 Menu Configuration Options
There are no menu configuration options for this driver. The Bus Frequency drivers is
included and enabled by default.
21.2.1 Board Configuration Options
There are no board configuration options for the Linux busfreq device driver.
Menu Configuration Options
i.MX 6Solo/6DualLite Linux Reference Manual, Rev. L3.0.35_4.1.0, 09/2013
164
Freescale Semiconductor, Inc.
