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 - items: 22 - const: samsung,exynosautov9-uart 23 - const: samsung,exynos850-uart 24 - enum: 25 - apple,s5l-uart 26 - axis,artpec8-uart 27 - samsung,s3c2410-uart 28 - samsung,s3c2412-uart 29 - samsung,s3c2440-uart 30 - samsung,s3c6400-uart 31 - samsung,s5pv210-uart 32 - samsung,exynos4210-uart 33 - samsung,exynos5433-uart 34 - samsung,exynos850-uart 35 36 reg: 37 maxItems: 1 38 39 reg-io-width: 40 description: | 41 The size (in bytes) of the IO accesses that should be performed 42 on the device. 43 $ref: /schemas/types.yaml#/definitions/uint32 44 enum: [ 1, 4 ] 45 46 clocks: 47 minItems: 2 48 maxItems: 5 49 50 clock-names: 51 description: N = 0 is allowed for SoCs without internal baud clock mux. 52 minItems: 2 53 items: 54 - const: uart 55 - pattern: '^clk_uart_baud[0-3]$' 56 - pattern: '^clk_uart_baud[0-3]$' 57 - pattern: '^clk_uart_baud[0-3]$' 58 - pattern: '^clk_uart_baud[0-3]$' 59 60 dmas: 61 items: 62 - description: DMA controller phandle and request line for RX 63 - description: DMA controller phandle and request line for TX 64 65 dma-names: 66 items: 67 - const: rx 68 - const: tx 69 70 interrupts: 71 description: RX interrupt and optionally TX interrupt. 72 minItems: 1 73 maxItems: 2 74 75 samsung,uart-fifosize: 76 description: The fifo size supported by the UART channel. 77 $ref: /schemas/types.yaml#/definitions/uint32 78 enum: [16, 64, 256] 79 80required: 81 - compatible 82 - clocks 83 - clock-names 84 - interrupts 85 - reg 86 87unevaluatedProperties: false 88 89allOf: 90 - $ref: serial.yaml# 91 92 - if: 93 properties: 94 compatible: 95 contains: 96 enum: 97 - samsung,s3c2410-uart 98 - samsung,s5pv210-uart 99 then: 100 properties: 101 clocks: 102 minItems: 2 103 maxItems: 3 104 clock-names: 105 minItems: 2 106 items: 107 - const: uart 108 - pattern: '^clk_uart_baud[0-1]$' 109 - pattern: '^clk_uart_baud[0-1]$' 110 111 - if: 112 properties: 113 compatible: 114 contains: 115 enum: 116 - apple,s5l-uart 117 - axis,artpec8-uart 118 - samsung,exynos4210-uart 119 - samsung,exynos5433-uart 120 then: 121 properties: 122 clocks: 123 maxItems: 2 124 clock-names: 125 items: 126 - const: uart 127 - const: clk_uart_baud0 128 129examples: 130 - | 131 #include <dt-bindings/clock/samsung,s3c64xx-clock.h> 132 133 uart0: serial@7f005000 { 134 compatible = "samsung,s3c6400-uart"; 135 reg = <0x7f005000 0x100>; 136 interrupt-parent = <&vic1>; 137 interrupts = <5>; 138 clock-names = "uart", "clk_uart_baud2", 139 "clk_uart_baud3"; 140 clocks = <&clocks PCLK_UART0>, <&clocks PCLK_UART0>, 141 <&clocks SCLK_UART>; 142 samsung,uart-fifosize = <16>; 143 }; 144