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 20