LXR linux/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
  11struct 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 */
  32