de0c7d543b
Specs are available here:
https://www.nxp.com/docs/en/data-sheet/PCA9554_9554A.pdf
This is a simple model supporting the basic registers for GPIO
mode. The device also supports an interrupt output line but the
model does not yet support this.
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Glenn Miles <milesg@linux.vnet.ibm.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
20 lines
503 B
C
20 lines
503 B
C
/*
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* PCA9554 I/O port registers
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*
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* Copyright (c) 2023, IBM Corporation.
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#ifndef PCA9554_REGS_H
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#define PCA9554_REGS_H
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/*
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* Bits [0:1] are used to address a specific register.
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*/
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#define PCA9554_INPUT 0 /* read only input register */
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#define PCA9554_OUTPUT 1 /* read/write pin output state */
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#define PCA9554_POLARITY 2 /* Set polarity of input register */
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#define PCA9554_CONFIG 3 /* Set pins as inputs our ouputs */
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#endif
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