1# SPDX-License-Identifier: GPL-2.0
2%YAML 1.2
3---
4$id: http://devicetree.org/schemas/serial/samsung_uart.yaml#
5$schema: http://devicetree.org/meta-schemas/core.yaml#
6
7title: Samsung S3C, S5P, Exynos, and S5L (Apple SoC) SoC UART Controller
8
9maintainers:
10  - Krzysztof Kozlowski <krzk@kernel.org>
11  - Greg Kroah-Hartman <gregkh@linuxfoundation.org>
12
13description: |+
14  Each Samsung UART should have an alias correctly numbered in the "aliases"
15  node, according to serialN format, where N is the port number (non-negative
16  decimal integer) as specified by User's Manual of respective SoC.
17
18properties:
19  compatible:
20    items:
21      - enum:
22          - apple,s5l-uart
23          - samsung,s3c2410-uart
24          - samsung,s3c2412-uart
25          - samsung,s3c2440-uart
26          - samsung,s3c6400-uart
27          - samsung,s5pv210-uart
28          - samsung,exynos4210-uart
29
30  reg:
31    maxItems: 1
32
33  reg-io-width:
34    description: |
35      The size (in bytes) of the IO accesses that should be performed
36      on the device.
37    $ref: /schemas/types.yaml#/definitions/uint32
38    enum: [ 1, 4 ]
39
40  clocks:
41    minItems: 2
42    maxItems: 5
43
44  clock-names:
45    description: N = 0 is allowed for SoCs without internal baud clock mux.
46    minItems: 2
47    maxItems: 5
48    items:
49      - const: uart
50      - pattern: '^clk_uart_baud[0-3]$'
51      - pattern: '^clk_uart_baud[0-3]$'
52      - pattern: '^clk_uart_baud[0-3]$'
53      - pattern: '^clk_uart_baud[0-3]$'
54
55  interrupts:
56    description: RX interrupt and optionally TX interrupt.
57    minItems: 1
58    maxItems: 2
59
60  samsung,uart-fifosize:
61    description: The fifo size supported by the UART channel.
62    $ref: /schemas/types.yaml#/definitions/uint32
63    enum: [16, 64, 256]
64
65required:
66  - compatible
67  - clocks
68  - clock-names
69  - interrupts
70  - reg
71
72additionalProperties: false
73
74allOf:
75  - if:
76      properties:
77        compatible:
78          contains:
79            enum:
80              - samsung,s3c2410-uart
81              - samsung,s5pv210-uart
82    then:
83      properties:
84        clocks:
85          minItems: 2
86          maxItems: 3
87        clock-names:
88          minItems: 2
89          maxItems: 3
90          items:
91            - const: uart
92            - pattern: '^clk_uart_baud[0-1]$'
93            - pattern: '^clk_uart_baud[0-1]$'
94
95  - if:
96      properties:
97        compatible:
98          contains:
99            enum:
100              - apple,s5l-uart
101              - samsung,exynos4210-uart
102    then:
103      properties:
104        clocks:
105          minItems: 2
106          maxItems: 2
107        clock-names:
108          minItems: 2
109          maxItems: 2
110          items:
111            - const: uart
112            - const: clk_uart_baud0
113
114examples:
115  - |
116    #include <dt-bindings/clock/samsung,s3c64xx-clock.h>
117
118    uart0: serial@7f005000 {
119        compatible = "samsung,s3c6400-uart";
120        reg = <0x7f005000 0x100>;
121        interrupt-parent = <&vic1>;
122        interrupts = <5>;
123        clock-names = "uart", "clk_uart_baud2",
124                      "clk_uart_baud3";
125        clocks = <&clocks PCLK_UART0>, <&clocks PCLK_UART0>,
126                 <&clocks SCLK_UART>;
127        samsung,uart-fifosize = <16>;
128    };
129