Commit fe91c24a authored by Hector Martin's avatar Hector Martin Committed by Greg Kroah-Hartman
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nvmem: Add apple-spmi-nvmem driver 



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

Reviewed-by: default avatarNeal Gompa <neal@gompa.dev>
Reviewed-by: default avatarAlyssa Rosenzweig <alyssa@rosenzweig.io>
Signed-off-by: default avatarHector Martin <marcan@marcan.st>
Co-developed-by: default avatarSasha Finkelstein <fnkl.kernel@gmail.com>
Signed-off-by: default avatarSasha Finkelstein <fnkl.kernel@gmail.com>
Signed-off-by: default avatarSrinivas Kandagatla <srini@kernel.org>
Link: https://lore.kernel.org/r/20250509122452.11827-4-srini@kernel.org


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 48332454

MAINTAINERS

+1 −0
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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/*

drivers/nvmem/Kconfig

+13 −0
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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

drivers/nvmem/Makefile

+2 −0
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@@ -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

drivers/nvmem/apple-spmi-nvmem.c

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// 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");