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 */
12struct 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