st,stm32h7rs-rcc

Vendor: STMicroelectronics N.V.

Description

STM32 Reset and Clock controller node for STM32H7RS 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(280)>; /* SYSCLK runs at 280MHz */
         dcpre = <1>;
         hpre = <1>;
         ppre1 = <1>;
         ppre2 = <1>;
         ppre4 = <1>;
         ppre5 = <1>;
}

Confere st,stm32-rcc binding for information about domain clocks configuration.

Properties

Node specific properties

Properties not inherited from the base binding file.

Name

Type

Details

#clock-cells

int

Number of items to expect in a Clock specifier

This property is required.

Constant value: 2

clock-frequency

int

default frequency in Hz for clock output

This property is required.

dcpre

int

CPU 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: 1, 2, 4, 8, 16, 64, 128, 256, 512

hpre

int

peripheral clock to the Bus Matrix APB (1/2/4/5) and AHB(1/2/3/4/5) peripheral
divider of the CPU clock by this  prescaler (BMPRE register)

This property is required.

Legal values: 1, 2, 4, 8, 16, 64, 128, 256, 512

ppre1

int

APB1 peripheral prescaler

This property is required.

Legal values: 1, 2, 4, 8, 16

ppre2

int

APB2 peripheral prescaler

This property is required.

Legal values: 1, 2, 4, 8, 16

ppre4

int

APB4 peripheral prescaler

This property is required.

Legal values: 1, 2, 4, 8, 16

ppre5

int

APB5 peripheral prescaler

This property is required.

Legal values: 1, 2, 4, 8, 16

Deprecated node specific properties

Deprecated properties not inherited from the base binding file.

(None)

Base properties

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,stm32h7rs-rcc” compatible.

Name

Type

Details

reg

array

register space

This property is required.

See Important properties for more information.

status

string

indicates the operational status of a device

Legal values: 'ok', 'okay', 'disabled', 'reserved', 'fail', 'fail-sss'

See Important properties for more information.

compatible

string-array

compatible strings

This property is required.

See Important properties for more information.

reg-names

string-array

name of each register space

interrupts

array

interrupts for device

See Important properties for more information.

interrupts-extended

compound

extended interrupt specifier for device

interrupt-names

string-array

name of each interrupt

interrupt-parent

phandle

phandle to interrupt controller node

label

string

Human readable string describing the device (used as device_get_binding() argument)

See Important properties for more information.

This property is deprecated.

clocks

phandle-array

Clock gate information

clock-names

string-array

name of each clock

#address-cells

int

number of address cells in reg property

#size-cells

int

number of size cells in reg property

dmas

phandle-array

DMA channels specifiers

dma-names

string-array

Provided names of DMA channel specifiers

io-channels

phandle-array

IO channels specifiers

io-channel-names

string-array

Provided names of IO channel specifiers

mboxes

phandle-array

mailbox / IPM channels specifiers

mbox-names

string-array

Provided names of mailbox / IPM channel specifiers

power-domains

phandle-array

Power domain specifiers

power-domain-names

string-array

Provided names of power domain specifiers

#power-domain-cells

int

Number of cells in power-domains property

zephyr,deferred-init

boolean

Do not initialize device automatically on boot. Device should be manually
initialized using device_init().

wakeup-source

boolean

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.

zephyr,pm-device-runtime-auto

boolean

Automatically configure the device for runtime power management after the
init function runs.

zephyr,disabling-power-states

phandles

List of power states that will disable this device power.

Specifier cell names

  • clock cells: bus, bits