xref: /linux/include/linux/spi/ds1305.h (revision 498495dba268b20e8eadd7fe93c140c68b6cc9d2)
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 */
37