1 // SPDX-License-Identifier: GPL-2.0-only OR MIT 2 /* 3 * Apple SPMI NVMEM driver 4 * 5 * Copyright The Asahi Linux Contributors 6 */ 7 8 #include <linux/kernel.h> 9 #include <linux/module.h> 10 #include <linux/nvmem-provider.h> 11 #include <linux/of.h> 12 #include <linux/spmi.h> 13 #include <linux/regmap.h> 14 15 static const struct regmap_config apple_spmi_regmap_config = { 16 .reg_bits = 16, 17 .val_bits = 8, 18 .max_register = 0xffff, 19 }; 20 21 static int apple_spmi_nvmem_probe(struct spmi_device *sdev) 22 { 23 struct regmap *regmap; 24 struct nvmem_config nvmem_cfg = { 25 .dev = &sdev->dev, 26 .name = "spmi_nvmem", 27 .id = NVMEM_DEVID_AUTO, 28 .word_size = 1, 29 .stride = 1, 30 .size = 0xffff, 31 .reg_read = (void *)regmap_bulk_read, 32 .reg_write = (void *)regmap_bulk_write, 33 }; 34 35 regmap = devm_regmap_init_spmi_ext(sdev, &apple_spmi_regmap_config); 36 if (IS_ERR(regmap)) 37 return PTR_ERR(regmap); 38 39 nvmem_cfg.priv = regmap; 40 41 return PTR_ERR_OR_ZERO(devm_nvmem_register(&sdev->dev, &nvmem_cfg)); 42 } 43 44 static const struct of_device_id apple_spmi_nvmem_id_table[] = { 45 { .compatible = "apple,spmi-nvmem" }, 46 { }, 47 }; 48 MODULE_DEVICE_TABLE(of, apple_spmi_nvmem_id_table); 49 50 static struct spmi_driver apple_spmi_nvmem_driver = { 51 .probe = apple_spmi_nvmem_probe, 52 .driver = { 53 .name = "apple-spmi-nvmem", 54 .of_match_table = apple_spmi_nvmem_id_table, 55 }, 56 }; 57 58 module_spmi_driver(apple_spmi_nvmem_driver); 59 60 MODULE_LICENSE("Dual MIT/GPL"); 61 MODULE_AUTHOR("Hector Martin <marcan@marcan.st>"); 62 MODULE_DESCRIPTION("Apple SPMI NVMEM driver"); 63