1# SPDX-License-Identifier: GPL-2.0
2%YAML 1.2
3---
4$id: http://devicetree.org/schemas/memory-controllers/samsung,exynos5422-dmc.yaml#
5$schema: http://devicetree.org/meta-schemas/core.yaml#
6
7title: |
8  Samsung Exynos5422 SoC frequency and voltage scaling for Dynamic Memory
9  Controller device
10
11maintainers:
12  - Krzysztof Kozlowski <krzk@kernel.org>
13  - Lukasz Luba <lukasz.luba@arm.com>
14
15description: |
16  The Samsung Exynos5422 SoC has DMC (Dynamic Memory Controller) to which the
17  DRAM memory chips are connected. The driver is to monitor the controller in
18  runtime and switch frequency and voltage. To monitor the usage of the
19  controller in runtime, the driver uses the PPMU (Platform Performance
20  Monitoring Unit), which is able to measure the current load of the memory.
21  When 'userspace' governor is used for the driver, an application is able to
22  switch the DMC and memory frequency.
23
24properties:
25  compatible:
26    items:
27      - const: samsung,exynos5422-dmc
28
29  clock-names:
30    items:
31      - const: fout_spll
32      - const: mout_sclk_spll
33      - const: ff_dout_spll2
34      - const: fout_bpll
35      - const: mout_bpll
36      - const: sclk_bpll
37      - const: mout_mx_mspll_ccore
38      - const: mout_mclk_cdrex
39
40  clocks:
41    minItems: 8
42    maxItems: 8
43
44  devfreq-events:
45    $ref: '/schemas/types.yaml#/definitions/phandle-array'
46    minItems: 1
47    maxItems: 16
48    items:
49      maxItems: 1
50    description: phandles of the PPMU events used by the controller.
51
52  device-handle:
53    $ref: '/schemas/types.yaml#/definitions/phandle'
54    description: |
55      phandle of the connected DRAM memory device. For more information please
56      refer to jedec,lpddr3.yaml.
57
58  operating-points-v2: true
59
60  interrupts:
61    items:
62      - description: DMC internal performance event counters in DREX0
63      - description: DMC internal performance event counters in DREX1
64
65  interrupt-names:
66    items:
67      - const: drex_0
68      - const: drex_1
69
70  reg:
71    items:
72      - description: registers of DREX0
73      - description: registers of DREX1
74
75  samsung,syscon-clk:
76    $ref: '/schemas/types.yaml#/definitions/phandle'
77    description: |
78      Phandle of the clock register set used by the controller, these registers
79      are used for enabling a 'pause' feature and are not exposed by clock
80      framework but they must be used in a safe way.  The register offsets are
81      in the driver code and specyfic for this SoC type.
82
83  vdd-supply: true
84
85required:
86  - compatible
87  - clock-names
88  - clocks
89  - devfreq-events
90  - device-handle
91  - reg
92  - samsung,syscon-clk
93
94additionalProperties: false
95
96examples:
97  - |
98    #include <dt-bindings/clock/exynos5420.h>
99    ppmu_dmc0_0: ppmu@10d00000 {
100        compatible = "samsung,exynos-ppmu";
101        reg = <0x10d00000 0x2000>;
102        clocks = <&clock CLK_PCLK_PPMU_DREX0_0>;
103        clock-names = "ppmu";
104        events {
105            ppmu_event_dmc0_0: ppmu-event3-dmc0-0 {
106                event-name = "ppmu-event3-dmc0_0";
107            };
108        };
109    };
110
111    memory-controller@10c20000 {
112        compatible = "samsung,exynos5422-dmc";
113        reg = <0x10c20000 0x10000>, <0x10c30000 0x10000>;
114        clocks = <&clock CLK_FOUT_SPLL>,
115                 <&clock CLK_MOUT_SCLK_SPLL>,
116                 <&clock CLK_FF_DOUT_SPLL2>,
117                 <&clock CLK_FOUT_BPLL>,
118                 <&clock CLK_MOUT_BPLL>,
119                 <&clock CLK_SCLK_BPLL>,
120                 <&clock CLK_MOUT_MX_MSPLL_CCORE>,
121                 <&clock CLK_MOUT_MCLK_CDREX>;
122        clock-names = "fout_spll",
123                      "mout_sclk_spll",
124                      "ff_dout_spll2",
125                      "fout_bpll",
126                      "mout_bpll",
127                      "sclk_bpll",
128                      "mout_mx_mspll_ccore",
129                      "mout_mclk_cdrex";
130        operating-points-v2 = <&dmc_opp_table>;
131        devfreq-events = <&ppmu_event3_dmc0_0>,	<&ppmu_event3_dmc0_1>,
132                         <&ppmu_event3_dmc1_0>, <&ppmu_event3_dmc1_1>;
133        device-handle = <&samsung_K3QF2F20DB>;
134        vdd-supply = <&buck1_reg>;
135        samsung,syscon-clk = <&clock>;
136        interrupt-parent = <&combiner>;
137        interrupts = <16 0>, <16 1>;
138        interrupt-names = "drex_0", "drex_1";
139    };
140