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UM0851 Datasheet(PDF) 234 Page - STMicroelectronics

Part # UM0851
Description  SPEAr is a family of highly customizable ARM-based embedded
PDF  245 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UM0851 Datasheet(HTML) 234 Page - STMicroelectronics

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Power management section
UM0851
234/245
Doc ID 16604 Rev 2
$ cat
/proc/spear_clocks
irda_fck 0 166000000 0
gmac_fck 0 166000000 1
smi_fck 0 166000000 0
fsmc_fck 0 83000000 1
udc_ck 0 48000000 1
appl_sub_gpio_fclk 0 83000000 0
basic_sub_gpio_fclk 0 83000000 0
jpeg_fclk 0 166000000 0
ssp2_fclk 0 83000000 0
ssp1_fclk 0 83000000 0
ssp0_fclk 0 83000000 0
adc_fclk 0 83000000 0
dma_fclk 0 166000000 1
clcd_fclk 0 48000000 0
mmci_fclk 0 33000000 0
wdt_fck 0 30000000 0
i2c_fck 0 166000000 0
i2c_ick 0 83000000 0
uart2_fck 0 48000000 0
uart1_fck 0 48000000 1
rtc_fck 0 32000 0
gpt5_fck 0 48000000 0
gpt5_ick 0 83000000 0
gpt4_fck 0 48000000 0
gpt4_ick 0 83000000 0
gpt3_fck 0 48000000 0
gpt3_ick 0 83000000 0
gpt2_fck 0 48000000 0
gpt2_ick 0 83000000 0
gpt1_fck 0 332000000 2
gpt1_ick 0 83000000 2
core_apb_lo_sys_ck 0 83000000 1
core_apb_cpu2_sys_ck 0 83000000 0
core_apb_cpu1_sys_ck 0 83000000 1
core_apb_basic_sys_ck 0 83000000 0
core_apb_app_sys_ck 0 83000000 0
core_ahb_ck 0 166000000 4
mpu_ck 0 332000000 0
core_ck 0 332000000 2
pll_ck 0 332000000 1
pll3_48_ck 0 48000000 2
sys_ck 0 30000000 2
osc_sys_ck 0 30000000 1
spear_32k_ck 0 32000 0
The command displays all the clocks in the clock dependency tree in the following format:
The above data can be interpreted to obtain the information that the GMAC functional clock
has a clock rate of 166 MHz and it's usage count is zero indicates that the Ethernet driver
interface has not been made up and is not using the clock.
There are certain drivers like I2C/UART which will only enable the clock while transmitting or
receiving the data, as they are acting as Master Controllers. The other drivers such as
Table 63.
Clock dependency tree display format (example)
Clock name
Clock ID
Clock rate
Clock usage count
gmac_fck
0
166000000
0



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