Bindings/serial/samsung_uart.yaml

   1 # SPDX-License-Identifier: GPL-2.0
   2 %YAML 1.2
   3 ---
   4 $id: http://devicetree.org/schemas/serial/samsung_uart.yaml#
   5 $schema: http://devicetree.org/meta-schemas/core.yaml#
   6
   7 title: Samsung S3C, S5P, Exynos, and S5L (Apple SoC) SoC UART Controller
   8
   9 maintainers:
  10   - Krzysztof Kozlowski <krzk@kernel.org>
  11   - Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  12
  13 description: |+
  14   Each Samsung UART should have an alias correctly numbered in the "aliases"
  15   node, according to serialN format, where N is the port number (non-negative
  16   decimal integer) as specified by User's Manual of respective SoC.
  17
  18 properties:
  19   compatible:
  20     oneOf:
  21       - items:
  22           - const: samsung,exynosautov9-uart
  23           - const: samsung,exynos850-uart
  24       - enum:
  25           - apple,s5l-uart
  26           - axis,artpec8-uart
  27           - samsung,s3c6400-uart
  28           - samsung,s5pv210-uart
  29           - samsung,exynos4210-uart
  30           - samsung,exynos5433-uart
  31           - samsung,exynos850-uart
  32
  33   reg:
  34     maxItems: 1
  35
  36   reg-io-width:
  37     description: |
  38       The size (in bytes) of the IO accesses that should be performed
  39       on the device.
  40     enum: [ 1, 4 ]
  41
  42   clocks:
  43     minItems: 2
  44     maxItems: 5
  45
  46   clock-names:
  47     description: N = 0 is allowed for SoCs without internal baud clock mux.
  48     minItems: 2
  49     items:
  50       - const: uart
  51       - pattern: '^clk_uart_baud[0-3]$'
  52       - pattern: '^clk_uart_baud[0-3]$'
  53       - pattern: '^clk_uart_baud[0-3]$'
  54       - pattern: '^clk_uart_baud[0-3]$'
  55
  56   dmas:
  57     items:
  58       - description: DMA controller phandle and request line for RX
  59       - description: DMA controller phandle and request line for TX
  60
  61   dma-names:
  62     items:
  63       - const: rx
  64       - const: tx
  65
  66   interrupts:
  67     description: RX interrupt and optionally TX interrupt.
  68     minItems: 1
  69     maxItems: 2
  70
  71   power-domains:
  72     maxItems: 1
  73
  74   samsung,uart-fifosize:
  75     description: The fifo size supported by the UART channel.
  76     $ref: /schemas/types.yaml#/definitions/uint32
  77     enum: [16, 64, 256]
  78
  79 required:
  80   - compatible
  81   - clocks
  82   - clock-names
  83   - interrupts
  84   - reg
  85
  86 allOf:
  87   - $ref: serial.yaml#
  88
  89   - if:
  90       properties:
  91         compatible:
  92           contains:
  93             enum:
  94               - samsung,s5pv210-uart
  95     then:
  96       properties:
  97         clocks:
  98           minItems: 2
  99           maxItems: 3
 100         clock-names:
 101           minItems: 2
 102           items:
 103             - const: uart
 104             - pattern: '^clk_uart_baud[0-1]$'
 105             - pattern: '^clk_uart_baud[0-1]$'
 106
 107   - if:
 108       properties:
 109         compatible:
 110           contains:
 111             enum:
 112               - apple,s5l-uart
 113               - axis,artpec8-uart
 114               - samsung,exynos4210-uart
 115               - samsung,exynos5433-uart
 116     then:
 117       properties:
 118         clocks:
 119           maxItems: 2
 120         clock-names:
 121           items:
 122             - const: uart
 123             - const: clk_uart_baud0
 124
 125 unevaluatedProperties: false
 126
 127 examples:
 128   - |
 129     #include <dt-bindings/clock/samsung,s3c64xx-clock.h>
 130
 131     uart0: serial@7f005000 {
 132         compatible = "samsung,s3c6400-uart";
 133         reg = <0x7f005000 0x100>;
 134         interrupt-parent = <&vic1>;
 135         interrupts = <5>;
 136         clock-names = "uart", "clk_uart_baud2",
 137                       "clk_uart_baud3";
 138         clocks = <&clocks PCLK_UART0>, <&clocks PCLK_UART0>,
 139                  <&clocks SCLK_UART>;
 140         samsung,uart-fifosize = <16>;
 141     };