Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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: 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>
authored by
Christian Marangi
and committed by
Greg Kroah-Hartman
e2258cfd
ddb095e8
+81
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drivers/nvmem/Kconfig
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drivers/nvmem/Kconfig
···
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# Devices
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config NVMEM_AN8855_EFUSE
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tristate "Airoha AN8855 eFuse support"
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depends on MFD_AIROHA_AN8855 || COMPILE_TEST
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help
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Say y here to enable support for reading eFuses on Airoha AN8855
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Switch. These are e.g. used to store factory programmed
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calibration data required for the PHY.
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This driver can also be built as a module. If so, the module will
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be called nvmem-an8855-efuse.
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config NVMEM_APPLE_EFUSES
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tristate "Apple eFuse support"
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depends on ARCH_APPLE || COMPILE_TEST
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drivers/nvmem/Makefile
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drivers/nvmem/Makefile
···
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obj-y += layouts/
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# Devices
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obj-$(CONFIG_NVMEM_AN8855_EFUSE) += nvmem-an8855-efuse.o
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nvmem-an8855-efuse-y := an8855-efuse.o
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obj-$(CONFIG_NVMEM_APPLE_EFUSES) += nvmem-apple-efuses.o
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nvmem-apple-efuses-y := apple-efuses.o
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obj-$(CONFIG_NVMEM_APPLE_SPMI) += apple_nvmem_spmi.o
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drivers/nvmem/an8855-efuse.c
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drivers/nvmem/an8855-efuse.c
···
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Airoha AN8855 Switch EFUSE Driver
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*/
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#include <linux/mod_devicetable.h>
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#include <linux/module.h>
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#include <linux/nvmem-provider.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#define AN8855_EFUSE_CELL 50
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#define AN8855_EFUSE_DATA0 0x1000a500
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#define AN8855_EFUSE_R50O GENMASK(30, 24)
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static int an8855_efuse_read(void *context, unsigned int offset,
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void *val, size_t bytes)
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{
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struct regmap *regmap = context;
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return regmap_bulk_read(regmap, AN8855_EFUSE_DATA0 + offset,
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val, bytes / sizeof(u32));
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}
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static int an8855_efuse_probe(struct platform_device *pdev)
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{
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struct nvmem_config an8855_nvmem_config = {
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.name = "an8855-efuse",
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.size = AN8855_EFUSE_CELL * sizeof(u32),
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.stride = sizeof(u32),
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.word_size = sizeof(u32),
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.reg_read = an8855_efuse_read,
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};
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struct device *dev = &pdev->dev;
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struct nvmem_device *nvmem;
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struct regmap *regmap;
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/* Assign NVMEM priv to MFD regmap */
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regmap = dev_get_regmap(dev->parent, NULL);
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if (!regmap)
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return -ENOENT;
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an8855_nvmem_config.priv = regmap;
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an8855_nvmem_config.dev = dev;
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nvmem = devm_nvmem_register(dev, &an8855_nvmem_config);
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return PTR_ERR_OR_ZERO(nvmem);
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}
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static const struct of_device_id an8855_efuse_of_match[] = {
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{ .compatible = "airoha,an8855-efuse", },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, an8855_efuse_of_match);
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static struct platform_driver an8855_efuse_driver = {
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.probe = an8855_efuse_probe,
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.driver = {
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.name = "an8855-efuse",
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.of_match_table = an8855_efuse_of_match,
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},
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};
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module_platform_driver(an8855_efuse_driver);
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MODULE_AUTHOR("Christian Marangi <ansuelsmth@gmail.com>");
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MODULE_DESCRIPTION("Driver for AN8855 Switch EFUSE");
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MODULE_LICENSE("GPL");