Root/include/sound/cs4271.h

1/*
2 * Definitions for CS4271 ASoC codec driver
3 *
4 * Copyright (c) 2010 Alexander Sverdlin <subaparts@yandex.ru>
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version 2
9 * of the License, or (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 */
16
17#ifndef __CS4271_H
18#define __CS4271_H
19
20struct cs4271_platform_data {
21    int gpio_nreset; /* GPIO driving Reset pin, if any */
22    bool amutec_eq_bmutec; /* flag to enable AMUTEC=BMUTEC */
23
24    /*
25     * The CS4271 requires its LRCLK and MCLK to be stable before its RESET
26     * line is de-asserted. That also means that clocks cannot be changed
27     * without putting the chip back into hardware reset, which also requires
28     * a complete re-initialization of all registers.
29     *
30     * One (undocumented) workaround is to assert and de-assert the PDN bit
31     * in the MODE2 register. This workaround can be enabled with the
32     * following flag.
33     *
34     * Note that this is not needed in case the clocks are stable
35     * throughout the entire runtime of the codec.
36     */
37    bool enable_soft_reset;
38};
39
40#endif /* __CS4271_H */
41

Archive Download this file



interactive