1 /* SPDX-License-Identifier: GPL-2.0-or-later * <<
2 /* 1 /*
3 * Definitions for CS4271 ASoC codec driver 2 * Definitions for CS4271 ASoC codec driver
4 * 3 *
5 * Copyright (c) 2010 Alexander Sverdlin <suba 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.
6 */ 15 */
7 16
8 #ifndef __CS4271_H 17 #ifndef __CS4271_H
9 #define __CS4271_H 18 #define __CS4271_H
10 19
11 struct cs4271_platform_data { 20 struct cs4271_platform_data {
>> 21 int gpio_nreset; /* GPIO driving Reset pin, if any */
12 bool amutec_eq_bmutec; /* flag to ena 22 bool amutec_eq_bmutec; /* flag to enable AMUTEC=BMUTEC */
13 23
14 /* 24 /*
15 * The CS4271 requires its LRCLK and M 25 * The CS4271 requires its LRCLK and MCLK to be stable before its RESET
16 * line is de-asserted. That also mean 26 * line is de-asserted. That also means that clocks cannot be changed
17 * without putting the chip back into 27 * without putting the chip back into hardware reset, which also requires
18 * a complete re-initialization of all 28 * a complete re-initialization of all registers.
19 * 29 *
20 * One (undocumented) workaround is to 30 * One (undocumented) workaround is to assert and de-assert the PDN bit
21 * in the MODE2 register. This workaro 31 * in the MODE2 register. This workaround can be enabled with the
22 * following flag. 32 * following flag.
23 * 33 *
24 * Note that this is not needed in cas 34 * Note that this is not needed in case the clocks are stable
25 * throughout the entire runtime of th 35 * throughout the entire runtime of the codec.
26 */ 36 */
27 bool enable_soft_reset; 37 bool enable_soft_reset;
28 }; 38 };
29 39
30 #endif /* __CS4271_H */ 40 #endif /* __CS4271_H */
31 41
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