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 and Exynos 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          - samsung,s3c2410-uart
23          - samsung,s3c2412-uart
24          - samsung,s3c2440-uart
25          - samsung,s3c6400-uart
26          - samsung,s5pv210-uart
27          - samsung,exynos4210-uart
28
29  reg:
30    maxItems: 1
31
32  reg-io-width:
33    description: |
34      The size (in bytes) of the IO accesses that should be performed
35      on the device.
36    allOf:
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    $ref: /schemas/types.yaml#/definitions/uint32
63    enum: [16, 64, 256]
64
65required:
66  - compatible
67  - clocks
68  - clock-names
69  - interrupts
70  - reg
71
72allOf:
73  - if:
74      properties:
75        compatible:
76          contains:
77            enum:
78              - samsung,s3c2410-uart
79              - samsung,s5pv210-uart
80    then:
81      properties:
82        clocks:
83          minItems: 2
84          maxItems: 3
85        clock-names:
86          minItems: 2
87          maxItems: 3
88          items:
89            - const: uart
90            - pattern: '^clk_uart_baud[0-1]$'
91            - pattern: '^clk_uart_baud[0-1]$'
92
93  - if:
94      properties:
95        compatible:
96          contains:
97            enum:
98              - samsung,exynos4210-uart
99    then:
100      properties:
101        clocks:
102          minItems: 2
103          maxItems: 2
104        clock-names:
105          minItems: 2
106          maxItems: 2
107          items:
108            - const: uart
109            - const: clk_uart_baud0
110
111examples:
112  - |
113    #include <dt-bindings/clock/samsung,s3c64xx-clock.h>
114
115    uart0: serial@7f005000 {
116        compatible = "samsung,s3c6400-uart";
117        reg = <0x7f005000 0x100>;
118        interrupt-parent = <&vic1>;
119        interrupts = <5>;
120        clock-names = "uart", "clk_uart_baud2",
121                      "clk_uart_baud3";
122        clocks = <&clocks PCLK_UART0>, <&clocks PCLK_UART0>,
123                 <&clocks SCLK_UART>;
124        samsung,uart-fifosize = <16>;
125    };
126