4844ab3fe7
Properties with variable number of items per each device are expected to have widest constraints in top-level "properties:" block and further customized (narrowed) in "if:then:". Add missing top-level constraints for clocks and clock-names. Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Link: https://lore.kernel.org/r/20240818173014.122073-5-krzysztof.kozlowski@linaro.org Acked-by: Conor Dooley <conor.dooley@microchip.com> Signed-off-by: Stephen Boyd <sboyd@kernel.org>
132 lines
3.2 KiB
YAML
132 lines
3.2 KiB
YAML
# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
|
|
%YAML 1.2
|
|
---
|
|
$id: http://devicetree.org/schemas/clock/st,stm32mp1-rcc.yaml#
|
|
$schema: http://devicetree.org/meta-schemas/core.yaml#
|
|
|
|
title: STMicroelectronics STM32MP1 Reset Clock Controller
|
|
|
|
maintainers:
|
|
- Gabriel Fernandez <gabriel.fernandez@foss.st.com>
|
|
|
|
description: |
|
|
The RCC IP is both a reset and a clock controller.
|
|
RCC makes also power management (resume/supend and wakeup interrupt).
|
|
Please also refer to reset.txt for common reset controller binding usage.
|
|
|
|
This binding uses common clock bindings
|
|
Documentation/devicetree/bindings/clock/clock-bindings.txt
|
|
|
|
Specifying clocks
|
|
=================
|
|
|
|
All available clocks are defined as preprocessor macros in
|
|
dt-bindings/clock/stm32mp1-clks.h header and can be used in device
|
|
tree sources.
|
|
|
|
Specifying softreset control of devices
|
|
=======================================
|
|
|
|
Device nodes should specify the reset channel required in their "resets"
|
|
property, containing a phandle to the reset device node and an index specifying
|
|
which channel to use.
|
|
The index is the bit number within the RCC registers bank, starting from RCC
|
|
base address.
|
|
It is calculated as: index = register_offset / 4 * 32 + bit_offset.
|
|
Where bit_offset is the bit offset within the register.
|
|
|
|
For example on STM32MP1, for LTDC reset:
|
|
ltdc = APB4_RSTSETR_offset / 4 * 32 + LTDC_bit_offset
|
|
= 0x180 / 4 * 32 + 0 = 3072
|
|
|
|
The list of valid indices for STM32MP1 is available in:
|
|
include/dt-bindings/reset-controller/stm32mp1-resets.h
|
|
include/dt-bindings/reset-controller/stm32mp13-resets.h
|
|
|
|
This file implements defines like:
|
|
#define LTDC_R 3072
|
|
|
|
properties:
|
|
"#clock-cells":
|
|
const: 1
|
|
|
|
"#reset-cells":
|
|
const: 1
|
|
|
|
compatible:
|
|
items:
|
|
- enum:
|
|
- st,stm32mp1-rcc-secure
|
|
- st,stm32mp1-rcc
|
|
- st,stm32mp13-rcc
|
|
- const: syscon
|
|
|
|
clocks:
|
|
minItems: 1
|
|
maxItems: 5
|
|
|
|
clock-names:
|
|
minItems: 1
|
|
maxItems: 5
|
|
|
|
reg:
|
|
maxItems: 1
|
|
|
|
required:
|
|
- "#clock-cells"
|
|
- "#reset-cells"
|
|
- compatible
|
|
- reg
|
|
|
|
if:
|
|
properties:
|
|
compatible:
|
|
contains:
|
|
enum:
|
|
- st,stm32mp1-rcc-secure
|
|
- st,stm32mp13-rcc
|
|
then:
|
|
properties:
|
|
clocks:
|
|
description: Specifies oscillators.
|
|
maxItems: 5
|
|
|
|
clock-names:
|
|
items:
|
|
- const: hse
|
|
- const: hsi
|
|
- const: csi
|
|
- const: lse
|
|
- const: lsi
|
|
required:
|
|
- clocks
|
|
- clock-names
|
|
else:
|
|
properties:
|
|
clocks:
|
|
description:
|
|
Specifies the external RX clock for ethernet MAC.
|
|
maxItems: 1
|
|
|
|
clock-names:
|
|
const: ETH_RX_CLK/ETH_REF_CLK
|
|
|
|
additionalProperties: false
|
|
|
|
examples:
|
|
- |
|
|
#include <dt-bindings/clock/stm32mp1-clks.h>
|
|
rcc: rcc@50000000 {
|
|
compatible = "st,stm32mp1-rcc-secure", "syscon";
|
|
reg = <0x50000000 0x1000>;
|
|
#clock-cells = <1>;
|
|
#reset-cells = <1>;
|
|
clock-names = "hse", "hsi", "csi", "lse", "lsi";
|
|
clocks = <&scmi_clk CK_SCMI_HSE>,
|
|
<&scmi_clk CK_SCMI_HSI>,
|
|
<&scmi_clk CK_SCMI_CSI>,
|
|
<&scmi_clk CK_SCMI_LSE>,
|
|
<&scmi_clk CK_SCMI_LSI>;
|
|
};
|
|
...
|