xref: /freebsd/sys/contrib/device-tree/Bindings/serial/samsung_uart.yaml (revision ec0ea6efa1ad229d75c394c1a9b9cac33af2b1d3) 
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
82unevaluatedProperties: false
83
84allOf:
85  - $ref: /schemas/serial.yaml#
86
87  - if:
88      properties:
89        compatible:
90          contains:
91            enum:
92              - samsung,s3c2410-uart
93              - samsung,s5pv210-uart
94    then:
95      properties:
96        clocks:
97          minItems: 2
98          maxItems: 3
99        clock-names:
100          minItems: 2
101          maxItems: 3
102          items:
103            - const: uart
104            - pattern: '^clk_uart_baud[0-1]$'
105            - pattern: '^clk_uart_baud[0-1]$'
106
107  - if:
108      properties:
109        compatible:
110          contains:
111            enum:
112              - apple,s5l-uart
113              - samsung,exynos4210-uart
114    then:
115      properties:
116        clocks:
117          minItems: 2
118          maxItems: 2
119        clock-names:
120          minItems: 2
121          maxItems: 2
122          items:
123            - const: uart
124            - const: clk_uart_baud0
125
126examples:
127  - |
128    #include <dt-bindings/clock/samsung,s3c64xx-clock.h>
129
130    uart0: serial@7f005000 {
131        compatible = "samsung,s3c6400-uart";
132        reg = <0x7f005000 0x100>;
133        interrupt-parent = <&vic1>;
134        interrupts = <5>;
135        clock-names = "uart", "clk_uart_baud2",
136                      "clk_uart_baud3";
137        clocks = <&clocks PCLK_UART0>, <&clocks PCLK_UART0>,
138                 <&clocks SCLK_UART>;
139        samsung,uart-fifosize = <16>;
140    };
141