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  dmas:
56    items:
57      - description: DMA controller phandle and request line for RX
58      - description: DMA controller phandle and request line for TX
59
60  dma-names:
61    items:
62      - const: rx
63      - const: tx
64
65  interrupts:
66    description: RX interrupt and optionally TX interrupt.
67    minItems: 1
68    maxItems: 2
69
70  samsung,uart-fifosize:
71    description: The fifo size supported by the UART channel.
72    $ref: /schemas/types.yaml#/definitions/uint32
73    enum: [16, 64, 256]
74
75required:
76  - compatible
77  - clocks
78  - clock-names
79  - interrupts
80  - reg
81
82additionalProperties: false
83
84allOf:
85  - if:
86      properties:
87        compatible:
88          contains:
89            enum:
90              - samsung,s3c2410-uart
91              - samsung,s5pv210-uart
92    then:
93      properties:
94        clocks:
95          minItems: 2
96          maxItems: 3
97        clock-names:
98          minItems: 2
99          maxItems: 3
100          items:
101            - const: uart
102            - pattern: '^clk_uart_baud[0-1]$'
103            - pattern: '^clk_uart_baud[0-1]$'
104
105  - if:
106      properties:
107        compatible:
108          contains:
109            enum:
110              - apple,s5l-uart
111              - samsung,exynos4210-uart
112    then:
113      properties:
114        clocks:
115          minItems: 2
116          maxItems: 2
117        clock-names:
118          minItems: 2
119          maxItems: 2
120          items:
121            - const: uart
122            - const: clk_uart_baud0
123
124examples:
125  - |
126    #include <dt-bindings/clock/samsung,s3c64xx-clock.h>
127
128    uart0: serial@7f005000 {
129        compatible = "samsung,s3c6400-uart";
130        reg = <0x7f005000 0x100>;
131        interrupt-parent = <&vic1>;
132        interrupts = <5>;
133        clock-names = "uart", "clk_uart_baud2",
134                      "clk_uart_baud3";
135        clocks = <&clocks PCLK_UART0>, <&clocks PCLK_UART0>,
136                 <&clocks SCLK_UART>;
137        samsung,uart-fifosize = <16>;
138    };
139