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linux/Documentation/devicetree/bindings/clock/samsung,exynos850-clock.yaml
Sam Protsenko 76dedb9c0b dt-bindings: clock: exynos850: Add CMU_CPUCLK0 and CMU_CPUCL1 
Document CPU clock management unit compatibles and add corresponding
clock indices. Exynos850 has two CPU clusters (CL0 and CL1), each
containing 4 Cortex-A55 cores. CPU PLLs are generating main CPU clocks
for each cluster, and there are alternate ("switch") clocks that can be
used temporarily while re-configuring the PLL for the new rate. ACLK,
ATCLK, PCLKDBG and PERIPHCLK clocks are driving corresponding buses.
CLK_CLUSTERx_SCLK are actual leaf CPU clocks and should be used to
change CPU rates. Also some CoreSight clocks can be derived from
DBG_USER (debug clock).

Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
Link: https://lore.kernel.org/r/20240224202053.25313-2-semen.protsenko@linaro.org
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
2024-02-25 16:48:45 +01:00

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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/clock/samsung,exynos850-clock.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Samsung Exynos850 SoC clock controller
maintainers:
- Sam Protsenko <semen.protsenko@linaro.org>
- Chanwoo Choi <cw00.choi@samsung.com>
- Krzysztof Kozlowski <krzk@kernel.org>
- Sylwester Nawrocki <s.nawrocki@samsung.com>
- Tomasz Figa <tomasz.figa@gmail.com>
description: |
Exynos850 clock controller is comprised of several CMU units, generating
clocks for different domains. Those CMU units are modeled as separate device
tree nodes, and might depend on each other. Root clocks in that clock tree are
two external clocks:: OSCCLK (26 MHz) and RTCCLK (32768 Hz). Those external
clocks must be defined as fixed-rate clocks in dts.
CMU_TOP is a top-level CMU, where all base clocks are prepared using PLLs and
dividers; all other leaf clocks (other CMUs) are usually derived from CMU_TOP.
Each clock is assigned an identifier and client nodes can use this identifier
to specify the clock which they consume. All clocks available for usage
in clock consumer nodes are defined as preprocessor macros in
'dt-bindings/clock/exynos850.h' header.
properties:
compatible:
enum:
- samsung,exynos850-cmu-top
- samsung,exynos850-cmu-apm
- samsung,exynos850-cmu-aud
- samsung,exynos850-cmu-cmgp
- samsung,exynos850-cmu-core
- samsung,exynos850-cmu-cpucl0
- samsung,exynos850-cmu-cpucl1
- samsung,exynos850-cmu-dpu
- samsung,exynos850-cmu-g3d
- samsung,exynos850-cmu-hsi
- samsung,exynos850-cmu-is
- samsung,exynos850-cmu-mfcmscl
- samsung,exynos850-cmu-peri
clocks:
minItems: 1
maxItems: 5
clock-names:
minItems: 1
maxItems: 5
"#clock-cells":
const: 1
reg:
maxItems: 1
allOf:
- if:
properties:
compatible:
contains:
const: samsung,exynos850-cmu-top
then:
properties:
clocks:
items:
- description: External reference clock (26 MHz)
clock-names:
items:
- const: oscclk
- if:
properties:
compatible:
contains:
const: samsung,exynos850-cmu-apm
then:
properties:
clocks:
items:
- description: External reference clock (26 MHz)
- description: CMU_APM bus clock (from CMU_TOP)
clock-names:
items:
- const: oscclk
- const: dout_clkcmu_apm_bus
- if:
properties:
compatible:
contains:
const: samsung,exynos850-cmu-aud
then:
properties:
clocks:
items:
- description: External reference clock (26 MHz)
- description: AUD clock (from CMU_TOP)
clock-names:
items:
- const: oscclk
- const: dout_aud
- if:
properties:
compatible:
contains:
const: samsung,exynos850-cmu-cmgp
then:
properties:
clocks:
items:
- description: External reference clock (26 MHz)
- description: CMU_CMGP bus clock (from CMU_APM)
clock-names:
items:
- const: oscclk
- const: gout_clkcmu_cmgp_bus
- if:
properties:
compatible:
contains:
const: samsung,exynos850-cmu-core
then:
properties:
clocks:
items:
- description: External reference clock (26 MHz)
- description: CMU_CORE bus clock (from CMU_TOP)
- description: CCI clock (from CMU_TOP)
- description: eMMC clock (from CMU_TOP)
- description: SSS clock (from CMU_TOP)
clock-names:
items:
- const: oscclk
- const: dout_core_bus
- const: dout_core_cci
- const: dout_core_mmc_embd
- const: dout_core_sss
- if:
properties:
compatible:
contains:
const: samsung,exynos850-cmu-cpucl0
then:
properties:
clocks:
items:
- description: External reference clock (26 MHz)
- description: CPUCL0 switch clock (from CMU_TOP)
- description: CPUCL0 debug clock (from CMU_TOP)
clock-names:
items:
- const: oscclk
- const: dout_cpucl0_switch
- const: dout_cpucl0_dbg
- if:
properties:
compatible:
contains:
const: samsung,exynos850-cmu-cpucl1
then:
properties:
clocks:
items:
- description: External reference clock (26 MHz)
- description: CPUCL1 switch clock (from CMU_TOP)
- description: CPUCL1 debug clock (from CMU_TOP)
clock-names:
items:
- const: oscclk
- const: dout_cpucl1_switch
- const: dout_cpucl1_dbg
- if:
properties:
compatible:
contains:
const: samsung,exynos850-cmu-dpu
then:
properties:
clocks:
items:
- description: External reference clock (26 MHz)
- description: DPU clock (from CMU_TOP)
clock-names:
items:
- const: oscclk
- const: dout_dpu
- if:
properties:
compatible:
contains:
const: samsung,exynos850-cmu-g3d
then:
properties:
clocks:
items:
- description: External reference clock (26 MHz)
- description: G3D clock (from CMU_TOP)
clock-names:
items:
- const: oscclk
- const: dout_g3d_switch
- if:
properties:
compatible:
contains:
const: samsung,exynos850-cmu-hsi
then:
properties:
clocks:
items:
- description: External reference clock (26 MHz)
- description: External RTC clock (32768 Hz)
- description: CMU_HSI bus clock (from CMU_TOP)
- description: SD card clock (from CMU_TOP)
- description: USB 2.0 DRD clock (from CMU_TOP)
clock-names:
items:
- const: oscclk
- const: rtcclk
- const: dout_hsi_bus
- const: dout_hsi_mmc_card
- const: dout_hsi_usb20drd
- if:
properties:
compatible:
contains:
const: samsung,exynos850-cmu-is
then:
properties:
clocks:
items:
- description: External reference clock (26 MHz)
- description: CMU_IS bus clock (from CMU_TOP)
- description: Image Texture Processing core clock (from CMU_TOP)
- description: Visual Recognition Accelerator clock (from CMU_TOP)
- description: Geometric Distortion Correction clock (from CMU_TOP)
clock-names:
items:
- const: oscclk
- const: dout_is_bus
- const: dout_is_itp
- const: dout_is_vra
- const: dout_is_gdc
- if:
properties:
compatible:
contains:
const: samsung,exynos850-cmu-mfcmscl
then:
properties:
clocks:
items:
- description: External reference clock (26 MHz)
- description: Multi-Format Codec clock (from CMU_TOP)
- description: Memory to Memory Scaler clock (from CMU_TOP)
- description: Multi-Channel Scaler clock (from CMU_TOP)
- description: JPEG codec clock (from CMU_TOP)
clock-names:
items:
- const: oscclk
- const: dout_mfcmscl_mfc
- const: dout_mfcmscl_m2m
- const: dout_mfcmscl_mcsc
- const: dout_mfcmscl_jpeg
- if:
properties:
compatible:
contains:
const: samsung,exynos850-cmu-peri
then:
properties:
clocks:
items:
- description: External reference clock (26 MHz)
- description: CMU_PERI bus clock (from CMU_TOP)
- description: UART clock (from CMU_TOP)
- description: Parent clock for HSI2C and SPI (from CMU_TOP)
clock-names:
items:
- const: oscclk
- const: dout_peri_bus
- const: dout_peri_uart
- const: dout_peri_ip
required:
- compatible
- "#clock-cells"
- clocks
- clock-names
- reg
additionalProperties: false
examples:
# Clock controller node for CMU_PERI
- |
#include <dt-bindings/clock/exynos850.h>
cmu_peri: clock-controller@10030000 {
compatible = "samsung,exynos850-cmu-peri";
reg = <0x10030000 0x8000>;
#clock-cells = <1>;
clocks = <&oscclk>, <&cmu_top CLK_DOUT_PERI_BUS>,
<&cmu_top CLK_DOUT_PERI_UART>,
<&cmu_top CLK_DOUT_PERI_IP>;
clock-names = "oscclk", "dout_peri_bus",
"dout_peri_uart", "dout_peri_ip";
};
...
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