| Tom Rini | 53633a8 | 2024-02-29 12:33:36 -0500 | [diff] [blame^] | 1 | GPIO driver for Maxim MAX3191x industrial serializer |
| 2 | |
| 3 | Required properties: |
| 4 | - compatible: Must be one of: |
| 5 | "maxim,max31910" |
| 6 | "maxim,max31911" |
| 7 | "maxim,max31912" |
| 8 | "maxim,max31913" |
| 9 | "maxim,max31953" |
| 10 | "maxim,max31963" |
| 11 | - reg: Chip select number. |
| 12 | - gpio-controller: Marks the device node as a GPIO controller. |
| 13 | - #gpio-cells: Should be two. For consumer use see gpio.txt. |
| 14 | |
| 15 | Optional properties: |
| 16 | - #daisy-chained-devices: |
| 17 | Number of chips in the daisy-chain (default is 1). |
| 18 | - maxim,modesel-gpios: GPIO pins to configure modesel of each chip. |
| 19 | The number of GPIOs must equal "#daisy-chained-devices" |
| 20 | (if each chip is driven by a separate pin) or 1 |
| 21 | (if all chips are wired to the same pin). |
| 22 | - maxim,fault-gpios: GPIO pins to read fault of each chip. |
| 23 | The number of GPIOs must equal "#daisy-chained-devices" |
| 24 | or 1. |
| 25 | - maxim,db0-gpios: GPIO pins to configure debounce of each chip. |
| 26 | The number of GPIOs must equal "#daisy-chained-devices" |
| 27 | or 1. |
| 28 | - maxim,db1-gpios: GPIO pins to configure debounce of each chip. |
| 29 | The number of GPIOs must equal "maxim,db0-gpios". |
| 30 | - maxim,modesel-8bit: Boolean whether the modesel pin of the chips is |
| 31 | pulled high (8-bit mode). Use this if the modesel pin |
| 32 | is hardwired and consequently "maxim,modesel-gpios" |
| 33 | cannot be specified. By default if neither this nor |
| 34 | "maxim,modesel-gpios" is given, the driver assumes |
| 35 | that modesel is pulled low (16-bit mode). |
| 36 | - maxim,ignore-undervoltage: |
| 37 | Boolean whether to ignore undervoltage alarms signaled |
| 38 | by the "maxim,fault-gpios" or by the status byte |
| 39 | (in 16-bit mode). Use this if the chips are powered |
| 40 | through 5VOUT instead of VCC24V, in which case they |
| 41 | will constantly signal undervoltage. |
| 42 | |
| 43 | For other required and optional properties of SPI slave nodes please refer to |
| 44 | ../spi/spi-bus.txt. |
| 45 | |
| 46 | Example: |
| 47 | gpio@0 { |
| 48 | compatible = "maxim,max31913"; |
| 49 | reg = <0>; |
| 50 | gpio-controller; |
| 51 | #gpio-cells = <2>; |
| 52 | |
| 53 | maxim,modesel-gpios = <&gpio2 23>; |
| 54 | maxim,fault-gpios = <&gpio2 24 GPIO_ACTIVE_LOW>; |
| 55 | maxim,db0-gpios = <&gpio2 25>; |
| 56 | maxim,db1-gpios = <&gpio2 26>; |
| 57 | |
| 58 | spi-max-frequency = <25000000>; |
| 59 | }; |