:orphan:
.. raw:: html
.. dtcompatible:: st,stm32h7rs-rcc
.. _dtbinding_st_stm32h7rs_rcc:
st,stm32h7rs-rcc
################
Vendor: :ref:`STMicroelectronics N.V. `
Description
***********
.. code-block:: none
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 = ; /* 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
**********
.. tabs::
.. group-tab:: Node specific properties
Properties not inherited from the base binding file.
.. list-table::
:widths: 1 1 4
:header-rows: 1
* - Name
- Type
- Details
* - ``#clock-cells``
- ``int``
- .. code-block:: none
Number of items to expect in a Clock specifier
This property is **required**.
Constant value: ``2``
* - ``clock-frequency``
- ``int``
- .. code-block:: none
default frequency in Hz for clock output
This property is **required**.
* - ``dcpre``
- ``int``
- .. code-block:: none
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``
- .. code-block:: none
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``
- .. code-block:: none
APB1 peripheral prescaler
This property is **required**.
Legal values: ``1``, ``2``, ``4``, ``8``, ``16``
* - ``ppre2``
- ``int``
- .. code-block:: none
APB2 peripheral prescaler
This property is **required**.
Legal values: ``1``, ``2``, ``4``, ``8``, ``16``
* - ``ppre4``
- ``int``
- .. code-block:: none
APB4 peripheral prescaler
This property is **required**.
Legal values: ``1``, ``2``, ``4``, ``8``, ``16``
* - ``ppre5``
- ``int``
- .. code-block:: none
APB5 peripheral prescaler
This property is **required**.
Legal values: ``1``, ``2``, ``4``, ``8``, ``16``
.. group-tab:: Deprecated node specific properties
Deprecated properties not inherited from the base binding file.
(None)
.. group-tab:: 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.
.. list-table::
:widths: 1 1 4
:header-rows: 1
* - Name
- Type
- Details
* - ``reg``
- ``array``
- .. code-block:: none
register space
This property is **required**.
See :ref:`zephyr:dt-important-props` for more information.
* - ``status``
- ``string``
- .. code-block:: none
indicates the operational status of a device
Legal values: ``'ok'``, ``'okay'``, ``'disabled'``, ``'reserved'``, ``'fail'``, ``'fail-sss'``
See :ref:`zephyr:dt-important-props` for more information.
* - ``compatible``
- ``string-array``
- .. code-block:: none
compatible strings
This property is **required**.
See :ref:`zephyr:dt-important-props` for more information.
* - ``reg-names``
- ``string-array``
- .. code-block:: none
name of each register space
* - ``interrupts``
- ``array``
- .. code-block:: none
interrupts for device
See :ref:`zephyr:dt-important-props` for more information.
* - ``interrupts-extended``
- ``compound``
- .. code-block:: none
extended interrupt specifier for device
* - ``interrupt-names``
- ``string-array``
- .. code-block:: none
name of each interrupt
* - ``interrupt-parent``
- ``phandle``
- .. code-block:: none
phandle to interrupt controller node
* - ``label``
- ``string``
- .. code-block:: none
Human readable string describing the device (used as device_get_binding() argument)
See :ref:`zephyr:dt-important-props` for more information.
This property is **deprecated**.
* - ``clocks``
- ``phandle-array``
- .. code-block:: none
Clock gate information
* - ``clock-names``
- ``string-array``
- .. code-block:: none
name of each clock
* - ``#address-cells``
- ``int``
- .. code-block:: none
number of address cells in reg property
* - ``#size-cells``
- ``int``
- .. code-block:: none
number of size cells in reg property
* - ``dmas``
- ``phandle-array``
- .. code-block:: none
DMA channels specifiers
* - ``dma-names``
- ``string-array``
- .. code-block:: none
Provided names of DMA channel specifiers
* - ``io-channels``
- ``phandle-array``
- .. code-block:: none
IO channels specifiers
* - ``io-channel-names``
- ``string-array``
- .. code-block:: none
Provided names of IO channel specifiers
* - ``mboxes``
- ``phandle-array``
- .. code-block:: none
mailbox / IPM channels specifiers
* - ``mbox-names``
- ``string-array``
- .. code-block:: none
Provided names of mailbox / IPM channel specifiers
* - ``power-domains``
- ``phandle-array``
- .. code-block:: none
Power domain specifiers
* - ``power-domain-names``
- ``string-array``
- .. code-block:: none
Provided names of power domain specifiers
* - ``#power-domain-cells``
- ``int``
- .. code-block:: none
Number of cells in power-domains property
* - ``zephyr,deferred-init``
- ``boolean``
- .. code-block:: none
Do not initialize device automatically on boot. Device should be manually
initialized using device_init().
* - ``wakeup-source``
- ``boolean``
- .. code-block:: none
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``
- .. code-block:: none
Automatically configure the device for runtime power management after the
init function runs.
* - ``zephyr,disabling-power-states``
- ``phandles``
- .. code-block:: none
List of power states that will disable this device power.
Specifier cell names
********************
- clock cells: bus, bits