include/sound/cs4271.h

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