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 */