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