| 1 | /* |
| 2 | * PCA9554 I/O port registers |
| 3 | * |
| 4 | * Copyright (c) 2023, IBM Corporation. |
| 5 | * |
| 6 | * SPDX-License-Identifier: GPL-2.0-or-later |
| 7 | */ |
| 8 | #ifndef PCA9554_REGS_H |
| 9 | #define PCA9554_REGS_H |
| 10 | |
| 11 | /* |
| 12 | * Bits [0:1] are used to address a specific register. |
| 13 | */ |
| 14 | #define PCA9554_INPUT 0 /* read only input register */ |
| 15 | #define PCA9554_OUTPUT 1 /* read/write pin output state */ |
| 16 | #define PCA9554_POLARITY 2 /* Set polarity of input register */ |
| 17 | #define PCA9554_CONFIG 3 /* Set pins as inputs our ouputs */ |
| 18 | |
| 19 | #endif |