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nvmem: an8855: Add support for Airoha AN8855 Switch EFUSE

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

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
Signed-off-by: Srinivas Kandagatla <srini@kernel.org>
Link: https://lore.kernel.org/r/20250912131415.303407-6-srini@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Christian Marangi 2025-09-12 14:14:15 +01:00 • committed by Greg Kroah-Hartman
parent ddb095e81d
commit e2258cfd9b
3 changed files with 81 additions and 0 deletions
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11
drivers/nvmem/Kconfig
View file

@ -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

2
drivers/nvmem/Makefile
View file

@ -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

68
drivers/nvmem/an8855-efuse.c Normal file
View file

@ -0,0 +1,68 @@
// 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");