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// SPDX-License-Identifier: GPL-2.0+/* * Generic driver for memory-mapped GPIO controllers. * * Copyright 2008 MontaVista Software, Inc. * Copyright 2008,2010 Anton Vorontsov <cbouatmailru@gmail.com> * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. * * ....``.```~~~~````.`.`.`.`.```````'',,,.........`````......`....... * ...`` ```````.. * ..The simplest form of a GPIO controller that the driver supports is`` * `.just a single "data" register, where GPIO state can be read and/or ` * `,..written. ,,..``~~~~ .....``.`.`.~~.```.`.........``````.``````` * ````````` ____/~~|___/~| . ```~~~~~~ ___/___\___ ,~.`.`.`.`````.~~...,,,,...__________|~$@~~~ %~ /o*o*o*o*o*o\ .. Implementing such a GPIO .o ` ~~~~\___/~~~~ ` controller in FPGA is ,.`