include/linux/spi/ds1305.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __LINUX_SPI_DS1305_H
   3 #define __LINUX_SPI_DS1305_H
   4
   5 /*
   6  * One-time configuration for ds1305 and ds1306 RTC chips.
   7  *
   8  * Put a pointer to this in spi_board_info.platform_data if you want to
   9  * be sure that Linux (re)initializes this as needed ... after losing
  10  * backup power, and potentially on the first boot.
  11  */
  12 struct ds1305_platform_data {
  13
  14         /* Trickle charge configuration:  it's OK to leave out the MAGIC
  15          * bitmask; mask in either DS1 or DS2, and then one of 2K/4k/8K.
  16          */
  17 #define DS1305_TRICKLE_MAGIC    0xa0
  18 #define DS1305_TRICKLE_DS2      0x08    /* two diodes */
  19 #define DS1305_TRICKLE_DS1      0x04    /* one diode */
  20 #define DS1305_TRICKLE_2K       0x01    /* 2 KOhm resistance */
  21 #define DS1305_TRICKLE_4K       0x02    /* 4 KOhm resistance */
  22 #define DS1305_TRICKLE_8K       0x03    /* 8 KOhm resistance */
  23         u8      trickle;
  24
  25         /* set only on ds1306 parts */
  26         bool    is_ds1306;
  27
  28         /* ds1306 only:  enable 1 Hz output */
  29         bool    en_1hz;
  30
  31         /* REVISIT:  the driver currently expects nINT0 to be wired
  32          * as the alarm IRQ.  ALM1 may also need to be set up ...
  33          */
  34 };
  35
  36 #endif /* __LINUX_SPI_DS1305_H */