xref: /linux/Documentation/devicetree/bindings/serial/samsung_uart.yaml (revision 06a130e42a5bfc84795464bff023bff4c16f58c5) 
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    oneOf:
21      - enum:
22          - apple,s5l-uart
23          - axis,artpec8-uart
24          - google,gs101-uart
25          - samsung,s3c6400-uart
26          - samsung,s5pv210-uart
27          - samsung,exynos4210-uart
28          - samsung,exynos5433-uart
29          - samsung,exynos850-uart
30      - items:
31          - enum:
32              - samsung,exynos7-uart
33              - tesla,fsd-uart
34          - const: samsung,exynos4210-uart
35      - items:
36          - enum:
37              - samsung,exynos7885-uart
38          - const: samsung,exynos5433-uart
39      - items:
40          - enum:
41              - samsung,exynosautov9-uart
42              - samsung,exynosautov920-uart
43          - const: samsung,exynos850-uart
44
45  reg:
46    maxItems: 1
47
48  reg-io-width:
49    description: |
50      The size (in bytes) of the IO accesses that should be performed
51      on the device.
52    enum: [ 1, 4 ]
53
54  clocks:
55    minItems: 2
56    maxItems: 5
57
58  clock-names:
59    minItems: 2
60    maxItems: 5
61
62  dmas:
63    items:
64      - description: DMA controller phandle and request line for RX
65      - description: DMA controller phandle and request line for TX
66
67  dma-names:
68    items:
69      - const: rx
70      - const: tx
71
72  interrupts:
73    description: RX interrupt and optionally TX interrupt.
74    minItems: 1
75    maxItems: 2
76
77  power-domains:
78    maxItems: 1
79
80  samsung,uart-fifosize:
81    description: The fifo size supported by the UART channel.
82    $ref: /schemas/types.yaml#/definitions/uint32
83    enum: [16, 64, 256]
84
85required:
86  - compatible
87  - clocks
88  - clock-names
89  - interrupts
90  - reg
91
92allOf:
93  - $ref: serial.yaml#
94
95  - if:
96      properties:
97        compatible:
98          contains:
99            enum:
100              - samsung,s3c6400-uart
101    then:
102      properties:
103        clocks:
104          minItems: 3
105          maxItems: 3
106
107        clock-names:
108          items:
109            - const: uart
110            - const: clk_uart_baud2
111            - const: clk_uart_baud3
112
113    else:
114      properties:
115        clock-names:
116          minItems: 2
117          items:
118            - const: uart
119            - const: clk_uart_baud0
120            - const: clk_uart_baud1
121            - const: clk_uart_baud2
122            - const: clk_uart_baud3
123
124  - if:
125      properties:
126        compatible:
127          contains:
128            enum:
129              - samsung,s5pv210-uart
130    then:
131      properties:
132        clocks:
133          minItems: 3
134          maxItems: 3
135
136        clock-names:
137          minItems: 3
138          maxItems: 3
139
140  - if:
141      properties:
142        compatible:
143          contains:
144            enum:
145              - apple,s5l-uart
146              - axis,artpec8-uart
147              - samsung,exynos4210-uart
148              - samsung,exynos5433-uart
149    then:
150      properties:
151        clocks:
152          maxItems: 2
153
154        clock-names:
155          maxItems: 2
156
157  - if:
158      properties:
159        compatible:
160          contains:
161            enum:
162              - google,gs101-uart
163    then:
164      required:
165        - samsung,uart-fifosize
166      properties:
167        reg-io-width: false
168
169        clocks:
170          maxItems: 2
171
172        clock-names:
173          maxItems: 2
174
175unevaluatedProperties: false
176
177examples:
178  - |
179    #include <dt-bindings/clock/samsung,s3c64xx-clock.h>
180
181    uart0: serial@7f005000 {
182        compatible = "samsung,s3c6400-uart";
183        reg = <0x7f005000 0x100>;
184        interrupt-parent = <&vic1>;
185        interrupts = <5>;
186        clock-names = "uart", "clk_uart_baud2",
187                      "clk_uart_baud3";
188        clocks = <&clocks PCLK_UART0>, <&clocks PCLK_UART0>,
189                 <&clocks SCLK_UART>;
190        samsung,uart-fifosize = <16>;
191    };
192  - |
193    #include <dt-bindings/clock/google,gs101.h>
194    #include <dt-bindings/interrupt-controller/arm-gic.h>
195    #include <dt-bindings/interrupt-controller/irq.h>
196
197    serial_0: serial@10a00000 {
198      compatible = "google,gs101-uart";
199      reg = <0x10a00000 0xc0>;
200      clocks = <&cmu_peric0 CLK_GOUT_PERIC0_PERIC0_TOP1_PCLK_0>,
201               <&cmu_peric0 CLK_GOUT_PERIC0_PERIC0_TOP1_IPCLK_0>;
202      clock-names = "uart", "clk_uart_baud0";
203      interrupts = <GIC_SPI 634 IRQ_TYPE_LEVEL_HIGH 0>;
204      pinctrl-0 = <&uart0_bus>;
205      pinctrl-names = "default";
206      samsung,uart-fifosize = <256>;
207    };
208