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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,exynosautov9-clock.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Samsung Exynos Auto v9 SoC clock controller
maintainers:
- Chanho Park <chanho61.park@samsung.com>
- Chanwoo Choi <cw00.choi@samsung.com>
- Krzysztof Kozlowski <krzk@kernel.org>
- Sylwester Nawrocki <s.nawrocki@samsung.com>
- Tomasz Figa <tomasz.figa@gmail.com>
description: |
Exynos Auto v9 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/XTCXO (26 MHz) and RTCCLK/XrtcXTI (32768 Hz).
The external OSCCLK must be defined as fixed-rate clock in dts.
CMU_TOP is a top-level CMU, where all base clocks are prepared using PLLs and
dividers; all other clocks of function blocks (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
'include/dt-bindings/clock/samsung,exynosautov9.h' header.
properties:
compatible:
enum:
- samsung,exynosautov9-cmu-top
- samsung,exynosautov9-cmu-busmc
- samsung,exynosautov9-cmu-core
- samsung,exynosautov9-cmu-fsys2
- samsung,exynosautov9-cmu-peric0
- samsung,exynosautov9-cmu-peric1
- samsung,exynosautov9-cmu-peris
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,exynosautov9-cmu-top
then:
properties:
clocks:
items:
- description: External reference clock (26 MHz)
clock-names:
items:
- const: oscclk
- if:
properties:
compatible:
contains:
const: samsung,exynosautov9-cmu-busmc
then:
properties:
clocks:
items:
- description: External reference clock (26 MHz)
- description: CMU_BUSMC bus clock (from CMU_TOP)
clock-names:
items:
- const: oscclk
- const: dout_clkcmu_busmc_bus
- if:
properties:
compatible:
contains:
const: samsung,exynosautov9-cmu-core
then:
properties:
clocks:
items:
- description: External reference clock (26 MHz)
- description: CMU_CORE bus clock (from CMU_TOP)
clock-names:
items:
- const: oscclk
- const: dout_clkcmu_core_bus
- if:
properties:
compatible:
contains:
const: samsung,exynosautov9-cmu-fsys2
then:
properties:
clocks:
items:
- description: External reference clock (26 MHz)
- description: CMU_FSYS2 bus clock (from CMU_TOP)
- description: UFS clock (from CMU_TOP)
- description: Ethernet clock (from CMU_TOP)
clock-names:
items:
- const: oscclk
- const: dout_clkcmu_fsys2_bus
- const: dout_fsys2_clkcmu_ufs_embd
- const: dout_fsys2_clkcmu_ethernet
- if:
properties:
compatible:
contains:
const: samsung,exynosautov9-cmu-peric0
then:
properties:
clocks:
items:
- description: External reference clock (26 MHz)
- description: CMU_PERIC0 bus clock (from CMU_TOP)
- description: PERIC0 IP clock (from CMU_TOP)
clock-names:
items:
- const: oscclk
- const: dout_clkcmu_peric0_bus
- const: dout_clkcmu_peric0_ip
- if:
properties:
compatible:
contains:
const: samsung,exynosautov9-cmu-peric1
then:
properties:
clocks:
items:
- description: External reference clock (26 MHz)
- description: CMU_PERIC1 bus clock (from CMU_TOP)
- description: PERIC1 IP clock (from CMU_TOP)
clock-names:
items:
- const: oscclk
- const: dout_clkcmu_peric1_bus
- const: dout_clkcmu_peric1_ip
- if:
properties:
compatible:
contains:
const: samsung,exynosautov9-cmu-peris
then:
properties:
clocks:
items:
- description: External reference clock (26 MHz)
- description: CMU_PERIS bus clock (from CMU_TOP)
clock-names:
items:
- const: oscclk
- const: dout_clkcmu_peris_bus
required:
- compatible
- "#clock-cells"
- clocks
- clock-names
- reg
additionalProperties: false
examples:
# Clock controller node for CMU_FSYS2
- |
#include <dt-bindings/clock/samsung,exynosautov9.h>
cmu_fsys2: clock-controller@17c00000 {
compatible = "samsung,exynosautov9-cmu-fsys2";
reg = <0x17c00000 0x8000>;
#clock-cells = <1>;
clocks = <&xtcxo>,
<&cmu_top DOUT_CLKCMU_FSYS2_BUS>,
<&cmu_top DOUT_CLKCMU_FSYS2_UFS_EMBD>,
<&cmu_top DOUT_CLKCMU_FSYS2_ETHERNET>;
clock-names = "oscclk",
"dout_clkcmu_fsys2_bus",
"dout_fsys2_clkcmu_ufs_embd",
"dout_fsys2_clkcmu_ethernet";
};
...
|
