Commit e2258cfd authored by Christian Marangi's avatar Christian Marangi Committed by Greg Kroah-Hartman
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nvmem: an8855: Add support for Airoha AN8855 Switch EFUSE 



Add support for Airoha AN8855 Switch EFUSE. These EFUSE might be used
for calibration data for the internal switch PHYs.

Signed-off-by: default avatarChristian Marangi <ansuelsmth@gmail.com>
Signed-off-by: default avatarSrinivas Kandagatla <srini@kernel.org>
Link: https://lore.kernel.org/r/20250912131415.303407-6-srini@kernel.org


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent ddb095e8

drivers/nvmem/Kconfig

+11 −0
Original line number Diff line number Diff line
@@ -28,6 +28,17 @@ source "drivers/nvmem/layouts/Kconfig" 


# Devices



config NVMEM_AN8855_EFUSE

	tristate "Airoha AN8855 eFuse support"

	depends on MFD_AIROHA_AN8855 || COMPILE_TEST

	help

	  Say y here to enable support for reading eFuses on Airoha AN8855

	  Switch. These are e.g. used to store factory programmed

	  calibration data required for the PHY.



	  This driver can also be built as a module. If so, the module will

	  be called nvmem-an8855-efuse.



config NVMEM_APPLE_EFUSES

	tristate "Apple eFuse support"

	depends on ARCH_APPLE || COMPILE_TEST

drivers/nvmem/Makefile

+2 −0
Original line number Diff line number Diff line
@@ -10,6 +10,8 @@ nvmem_layouts-y := layouts.o 
obj-y				+= layouts/



# Devices

obj-$(CONFIG_NVMEM_AN8855_EFUSE)	+= nvmem-an8855-efuse.o

nvmem-an8855-efuse-y 			:= an8855-efuse.o

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

drivers/nvmem/an8855-efuse.c

0 → 100644
+68 −0
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// SPDX-License-Identifier: GPL-2.0

/*

 *  Airoha AN8855 Switch EFUSE Driver

 */



#include <linux/mod_devicetable.h>

#include <linux/module.h>

#include <linux/nvmem-provider.h>

#include <linux/platform_device.h>

#include <linux/regmap.h>



#define AN8855_EFUSE_CELL		50



#define AN8855_EFUSE_DATA0		0x1000a500

#define   AN8855_EFUSE_R50O		GENMASK(30, 24)



static int an8855_efuse_read(void *context, unsigned int offset,

			     void *val, size_t bytes)

{

	struct regmap *regmap = context;



	return regmap_bulk_read(regmap, AN8855_EFUSE_DATA0 + offset,

				val, bytes / sizeof(u32));

}



static int an8855_efuse_probe(struct platform_device *pdev)

{

	struct nvmem_config an8855_nvmem_config = {

		.name = "an8855-efuse",

		.size = AN8855_EFUSE_CELL * sizeof(u32),

		.stride = sizeof(u32),

		.word_size = sizeof(u32),

		.reg_read = an8855_efuse_read,

	};

	struct device *dev = &pdev->dev;

	struct nvmem_device *nvmem;

	struct regmap *regmap;



	/* Assign NVMEM priv to MFD regmap */

	regmap = dev_get_regmap(dev->parent, NULL);

	if (!regmap)

		return -ENOENT;



	an8855_nvmem_config.priv = regmap;

	an8855_nvmem_config.dev = dev;

	nvmem = devm_nvmem_register(dev, &an8855_nvmem_config);



	return PTR_ERR_OR_ZERO(nvmem);

}



static const struct of_device_id an8855_efuse_of_match[] = {

	{ .compatible = "airoha,an8855-efuse", },

	{ /* sentinel */ }

};

MODULE_DEVICE_TABLE(of, an8855_efuse_of_match);



static struct platform_driver an8855_efuse_driver = {

	.probe = an8855_efuse_probe,

	.driver = {

		.name = "an8855-efuse",

		.of_match_table = an8855_efuse_of_match,

	},

};

module_platform_driver(an8855_efuse_driver);



MODULE_AUTHOR("Christian Marangi <ansuelsmth@gmail.com>");

MODULE_DESCRIPTION("Driver for AN8855 Switch EFUSE");

MODULE_LICENSE("GPL");