st,stm32h7-rcc
Vendor: STMicroelectronics
Description
STM32 Reset and Clock controller node for STM32H7 devices
This node is in charge of system clock ('SYSCLK') source selection and
System Clock Generation.
Configuring STM32 Reset and Clock controller node:
System clock source should be selected amongst the clock nodes available in "clocks"
node (typically 'clk_hse, clk_csi', 'pll', ...).
As part of this node configuration, SYSCLK frequency should also be defined, using
"clock-frequency" property.
Last, bus clocks (typically HCLK, PCLK1, PCLK2) should be configured using matching
prescaler properties.
Here is an example of correctly configured rcc node:
&rcc {
clocks = <&pll>; /* Set pll as SYSCLK source */
clock-frequency = <DT_FREQ_M(480)>; /* SYSCLK runs at 480MHz */
d1cpre = <1>;
hpre = <1>;
d1ppre = <1>;
d2ppre1 = <1>;
d2ppre2 = <1>;
d3ppre = <1>;
}
Confere st,stm32-rcc binding for information about domain clocks configuration.
Properties
Properties not inherited from the base binding file.
Name |
Type |
Details |
|---|---|---|
|
|
Number of items to expect in a Clock specifier
This property is required. Constant value: |
|
|
default frequency in Hz for clock output
This property is required. |
|
|
D1 Domain, CPU1 clock prescaler. Sets a HCLK frequency (feeding Cortex-M Systick)
lower than SYSCLK frequency (actual core frequency).
Zephyr doesn't make a difference today between these two clocks.
Changing this prescaler is not allowed until it is made possible to
use them independently in Zephyr clock subsystem.
This property is required. Legal values: |
|
|
D2 domain, CPU2 core clock and AHB(1/2/3/4) peripheral prescaler
This property is required. Legal values: |
|
|
D1 domain, APB3 peripheral prescaler
This property is required. Legal values: |
|
|
D2 domain, APB1 peripheral prescaler
This property is required. Legal values: |
|
|
D2 domain, APB2 peripheral prescaler
This property is required. Legal values: |
|
|
D3 domain, APB4 peripheral prescaler
This property is required. Legal values: |
Deprecated properties not inherited from the base binding file.
(None)
Properties inherited from the base binding file, which defines common properties that may be set on many nodes. Not all of these may apply to the “st,stm32h7-rcc” compatible.
Name |
Type |
Details |
|---|---|---|
|
|
Property to identify that a device can be used as wake up source.
When this property is provided a specific flag is set into the
device that tells the system that the device is capable of
wake up the system.
Wake up capable devices are disabled (interruptions will not wake up
the system) by default but they can be enabled at runtime if necessary.
|
|
|
Automatically configure the device for runtime power management after the
init function runs.
|
|
|
List of power states that will disable this device power.
|
|
|
indicates the operational status of a device
Legal values: See Important properties for more information. |
|
|
compatible strings
This property is required. See Important properties for more information. |
|
|
register space
This property is required. See Important properties for more information. |
|
|
name of each register space
|
|
|
interrupts for device
See Important properties for more information. |
|
|
extended interrupt specifier for device
|
|
|
name of each interrupt
|
|
|
phandle to interrupt controller node
|
|
|
Human readable string describing the device (used as device_get_binding() argument)
See Important properties for more information. This property is deprecated. |
|
|
Clock gate information
|
|
|
name of each clock
|
|
|
number of address cells in reg property
|
|
|
number of size cells in reg property
|
|
|
DMA channels specifiers
|
|
|
Provided names of DMA channel specifiers
|
|
|
IO channels specifiers
|
|
|
Provided names of IO channel specifiers
|
|
|
mailbox / IPM channels specifiers
|
|
|
Provided names of mailbox / IPM channel specifiers
|
|
|
Power domain specifiers
|
|
|
Provided names of power domain specifiers
|
|
|
Number of cells in power-domains property
|
|
|
Do not initialize device automatically on boot. Device should be manually
initialized using device_init().
|
Specifier cell names
clock cells: bus, bits