#ifndef __LINUX_SPI_DS1305_H
  #define __LINUX_SPI_DS1305_H
  
  /*
   * One-time configuration for ds1305 and ds1306 RTC chips.
   *
   * Put a pointer to this in spi_board_info.platform_data if you want to
   * be sure that Linux (re)initializes this as needed ... after losing
   * backup power, and potentially on the first boot.
   */
  struct ds1305_platform_data {
  
  	/* Trickle charge configuration:  it's OK to leave out the MAGIC
  	 * bitmask; mask in either DS1 or DS2, and then one of 2K/4k/8K.
  	 */
  #define DS1305_TRICKLE_MAGIC	0xa0
  #define DS1305_TRICKLE_DS2	0x08	/* two diodes */
  #define DS1305_TRICKLE_DS1	0x04	/* one diode */
  #define DS1305_TRICKLE_2K	0x01	/* 2 KOhm resistance */
  #define DS1305_TRICKLE_4K	0x02	/* 4 KOhm resistance */
  #define DS1305_TRICKLE_8K	0x03	/* 8 KOhm resistance */
  	u8	trickle;
  
  	/* set only on ds1306 parts */
  	bool	is_ds1306;
  
  	/* ds1306 only:  enable 1 Hz output */
  	bool	en_1hz;
  
  	/* REVISIT:  the driver currently expects nINT0 to be wired
  	 * as the alarm IRQ.  ALM1 may also need to be set up ...
  	 */
  };
  
  #endif /* __LINUX_SPI_DS1305_H */