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nvmem: Add apple-spmi-nvmem driver

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Add a driver for a series of SPMI-attached PMICs present on Apple devices

Reviewed-by: Neal Gompa <neal@gompa.dev>
Reviewed-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Signed-off-by: Hector Martin <marcan@marcan.st>
Co-developed-by: Sasha Finkelstein <fnkl.kernel@gmail.com>
Signed-off-by: Sasha Finkelstein <fnkl.kernel@gmail.com>
Signed-off-by: Srinivas Kandagatla <srini@kernel.org>
Link: https://lore.kernel.org/r/20250509122452.11827-4-srini@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Hector Martin 2025-05-09 13:24:52 +01:00 • committed by Greg Kroah-Hartman
parent 4833245492
commit fe91c24a55
4 changed files with 78 additions and 0 deletions
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1
MAINTAINERS
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@ -2298,6 +2298,7 @@ F: drivers/iommu/io-pgtable-dart.c
F: drivers/irqchip/irq-apple-aic.c
F: drivers/nvme/host/apple.c
F: drivers/nvmem/apple-efuses.c
F: drivers/nvmem/apple-spmi-nvmem.c
F: drivers/pinctrl/pinctrl-apple-gpio.c
F: drivers/pwm/pwm-apple.c
F: drivers/soc/apple/*

13
drivers/nvmem/Kconfig
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@ -40,6 +40,19 @@ config NVMEM_APPLE_EFUSES
This driver can also be built as a module. If so, the module will
be called nvmem-apple-efuses.
config NVMEM_APPLE_SPMI
tristate "Apple SPMI NVMEM"
depends on ARCH_APPLE || COMPILE_TEST
depends on SPMI
select REGMAP_SPMI
help
Say y here to build a driver to expose NVMEM cells for a set of power
and RTC-related settings on a SPMI-attached PMIC present on Apple
devices, such as Apple Silicon Macs.
This driver can also be built as a module. If so, the module
will be called apple-nvmem-spmi.
config NVMEM_BCM_OCOTP
tristate "Broadcom On-Chip OTP Controller support"
depends on ARCH_BCM_IPROC || COMPILE_TEST

2
drivers/nvmem/Makefile
View file

@ -12,6 +12,8 @@ obj-y += layouts/
# Devices
obj-$(CONFIG_NVMEM_APPLE_EFUSES) += nvmem-apple-efuses.o
nvmem-apple-efuses-y := apple-efuses.o
obj-$(CONFIG_NVMEM_APPLE_SPMI) += apple_nvmem_spmi.o
apple_nvmem_spmi-y := apple-spmi-nvmem.o
obj-$(CONFIG_NVMEM_BCM_OCOTP) += nvmem-bcm-ocotp.o
nvmem-bcm-ocotp-y := bcm-ocotp.o
obj-$(CONFIG_NVMEM_BRCM_NVRAM) += nvmem_brcm_nvram.o

62
drivers/nvmem/apple-spmi-nvmem.c Normal file
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@ -0,0 +1,62 @@
// SPDX-License-Identifier: GPL-2.0-only OR MIT
/*
* Apple SPMI NVMEM driver
*
* Copyright The Asahi Linux Contributors
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/nvmem-provider.h>
#include <linux/of.h>
#include <linux/spmi.h>
#include <linux/regmap.h>
static const struct regmap_config apple_spmi_regmap_config = {
.reg_bits = 16,
.val_bits = 8,
.max_register = 0xffff,
};
static int apple_spmi_nvmem_probe(struct spmi_device *sdev)
{
struct regmap *regmap;
struct nvmem_config nvmem_cfg = {
.dev = &sdev->dev,
.name = "spmi_nvmem",
.id = NVMEM_DEVID_AUTO,
.word_size = 1,
.stride = 1,
.size = 0xffff,
.reg_read = (void *)regmap_bulk_read,
.reg_write = (void *)regmap_bulk_write,
};
regmap = devm_regmap_init_spmi_ext(sdev, &apple_spmi_regmap_config);
if (IS_ERR(regmap))
return PTR_ERR(regmap);
nvmem_cfg.priv = regmap;
return PTR_ERR_OR_ZERO(devm_nvmem_register(&sdev->dev, &nvmem_cfg));
}
static const struct of_device_id apple_spmi_nvmem_id_table[] = {
{ .compatible = "apple,spmi-nvmem" },
{ },
};
MODULE_DEVICE_TABLE(of, apple_spmi_nvmem_id_table);
static struct spmi_driver apple_spmi_nvmem_driver = {
.probe = apple_spmi_nvmem_probe,
.driver = {
.name = "apple-spmi-nvmem",
.of_match_table = apple_spmi_nvmem_id_table,
},
};
module_spmi_driver(apple_spmi_nvmem_driver);
MODULE_LICENSE("Dual MIT/GPL");
MODULE_AUTHOR("Hector Martin <marcan@marcan.st>");
MODULE_DESCRIPTION("Apple SPMI NVMEM driver");