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
  20 struct 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 */