| Tom Rini | 93743d2 | 2024-04-01 09:08:13 -0400 | [diff] [blame] | 1 | # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) |
| 2 | %YAML 1.2 |
| 3 | --- |
| 4 | $id: http://devicetree.org/schemas/gpio/nuvoton,sgpio.yaml# |
| 5 | $schema: http://devicetree.org/meta-schemas/core.yaml# |
| 6 | |
| 7 | title: Nuvoton SGPIO controller |
| 8 | |
| 9 | maintainers: |
| 10 | - Jim LIU <JJLIU0@nuvoton.com> |
| 11 | |
| 12 | description: | |
| 13 | This SGPIO controller is for NUVOTON NPCM7xx and NPCM8xx SoC and detailed |
| 14 | information is in the NPCM7XX/8XX SERIAL I/O EXPANSION INTERFACE section. |
| 15 | Nuvoton NPCM7xx SGPIO module is combines a serial to parallel IC (HC595) |
| 16 | and a parallel to serial IC (HC165). |
| 17 | Clock is a division of the APB3 clock. |
| 18 | This interface has 4 pins (D_out , D_in, S_CLK, LDSH). |
| 19 | NPCM7xx/NPCM8xx have two sgpio modules. Each module can support up |
| 20 | to 64 output pins, and up to 64 input pins, the pin is only for GPI or GPO. |
| 21 | GPIO pins can be programmed to support the following options |
| 22 | - Support interrupt option for each input port and various interrupt |
| 23 | sensitivity options (level-high, level-low, edge-high, edge-low) |
| 24 | - ngpios is number of nuvoton,input-ngpios GPIO lines and nuvoton,output-ngpios GPIO lines. |
| 25 | nuvoton,input-ngpios GPIO lines is only for GPI. |
| 26 | nuvoton,output-ngpios GPIO lines is only for GPO. |
| 27 | |
| 28 | properties: |
| 29 | compatible: |
| 30 | enum: |
| 31 | - nuvoton,npcm750-sgpio |
| 32 | - nuvoton,npcm845-sgpio |
| 33 | |
| 34 | reg: |
| 35 | maxItems: 1 |
| 36 | |
| 37 | gpio-controller: true |
| 38 | |
| 39 | '#gpio-cells': |
| 40 | const: 2 |
| 41 | |
| 42 | interrupts: |
| 43 | maxItems: 1 |
| 44 | |
| 45 | clocks: |
| 46 | maxItems: 1 |
| 47 | |
| 48 | nuvoton,input-ngpios: |
| 49 | $ref: /schemas/types.yaml#/definitions/uint32 |
| 50 | description: |
| 51 | The numbers of GPIO's exposed. GPIO lines are only for GPI. |
| 52 | minimum: 0 |
| 53 | maximum: 64 |
| 54 | |
| 55 | nuvoton,output-ngpios: |
| 56 | $ref: /schemas/types.yaml#/definitions/uint32 |
| 57 | description: |
| 58 | The numbers of GPIO's exposed. GPIO lines are only for GPO. |
| 59 | minimum: 0 |
| 60 | maximum: 64 |
| 61 | |
| 62 | required: |
| 63 | - compatible |
| 64 | - reg |
| 65 | - gpio-controller |
| 66 | - '#gpio-cells' |
| 67 | - interrupts |
| 68 | - nuvoton,input-ngpios |
| 69 | - nuvoton,output-ngpios |
| 70 | - clocks |
| 71 | |
| 72 | additionalProperties: false |
| 73 | |
| 74 | examples: |
| 75 | - | |
| 76 | #include <dt-bindings/clock/nuvoton,npcm7xx-clock.h> |
| 77 | #include <dt-bindings/interrupt-controller/arm-gic.h> |
| 78 | gpio8: gpio@101000 { |
| 79 | compatible = "nuvoton,npcm750-sgpio"; |
| 80 | reg = <0x101000 0x200>; |
| 81 | clocks = <&clk NPCM7XX_CLK_APB3>; |
| 82 | interrupts = <GIC_SPI 19 IRQ_TYPE_LEVEL_HIGH>; |
| 83 | gpio-controller; |
| 84 | #gpio-cells = <2>; |
| 85 | nuvoton,input-ngpios = <64>; |
| 86 | nuvoton,output-ngpios = <64>; |
| 87 | }; |