1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __LINUX_SPI_EEPROM_H 3 #define __LINUX_SPI_EEPROM_H 4 5 #include <linux/memory.h> 6 7 /* 8 * Put one of these structures in platform_data for SPI EEPROMS handled 9 * by the "at25" driver. On SPI, most EEPROMS understand the same core 10 * command set. If you need to support EEPROMs that don't yet fit, add 11 * flags to support those protocol options. These values all come from 12 * the chip datasheets. 13 */ 14 struct spi_eeprom { 15 u32 byte_len; 16 char name[10]; 17 u32 page_size; /* for writes */ 18 u16 flags; 19 #define EE_ADDR1 0x0001 /* 8 bit addrs */ 20 #define EE_ADDR2 0x0002 /* 16 bit addrs */ 21 #define EE_ADDR3 0x0004 /* 24 bit addrs */ 22 #define EE_READONLY 0x0008 /* disallow writes */ 23 24 /* 25 * Certain EEPROMS have a size that is larger than the number of address 26 * bytes would allow (e.g. like M95040 from ST that has 512 Byte size 27 * but uses only one address byte (A0 to A7) for addressing.) For 28 * the extra address bit (A8, A16 or A24) bit 3 of the instruction byte 29 * is used. This instruction bit is normally defined as don't care for 30 * other AT25 like chips. 31 */ 32 #define EE_INSTR_BIT3_IS_ADDR 0x0010 33 34 void *context; 35 }; 36 37 #endif /* __LINUX_SPI_EEPROM_H */ 38