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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2026 Roman Vivchar <rva333@protonmail.com>
*/
#include <linux/err.h>
#include <linux/mfd/mt6397/core.h>
#include <linux/module.h>
#include <linux/nvmem-provider.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/types.h>
#include <linux/mfd/mt6323/registers.h>
#define MT6323_EFUSE_DOUT_BASE MT6323_EFUSE_DOUT_0_15
#define MT6323_EFUSE_SIZE 24
static int mt6323_efuse_read(void *context, unsigned int offset, void *val,
size_t bytes)
{
struct regmap *map = context;
u16 *buf = val;
u32 tmp;
int ret;
/*
* A manual loop using regmap_read is required because PWRAP is not
* a continuous MMIO space, but rather a FSM that doesn't implement the
* necessary read callback for the regmap_read_raw and regmap_read_bulk
* functions.
*/
for (size_t i = 0; i < bytes; i += sizeof(*buf)) {
ret = regmap_read(map, MT6323_EFUSE_DOUT_BASE + offset + i, &tmp);
if (ret)
return ret;
*buf++ = tmp;
}
return 0;
}
static int mt6323_efuse_probe(struct platform_device *pdev)
{
struct mt6397_chip *mt6323 = dev_get_drvdata(pdev->dev.parent);
struct device *dev = &pdev->dev;
struct nvmem_config config = {
.name = "mt6323-efuse",
.stride = 2,
.word_size = 2,
.size = MT6323_EFUSE_SIZE,
.reg_read = mt6323_efuse_read,
};
struct nvmem_device *nvmem;
if (!mt6323 || !mt6323->regmap)
return dev_err_probe(dev, -ENODEV, "failed to get parent\n");
config.dev = dev;
config.priv = mt6323->regmap;
nvmem = devm_nvmem_register(dev, &config);
return PTR_ERR_OR_ZERO(nvmem);
}
static const struct of_device_id mt6323_efuse_of_match[] = {
{ .compatible = "mediatek,mt6323-efuse" },
{ }
};
MODULE_DEVICE_TABLE(of, mt6323_efuse_of_match);
static struct platform_driver mt6323_efuse_driver = {
.probe = mt6323_efuse_probe,
.driver = {
.name = "mt6323-efuse",
.of_match_table = mt6323_efuse_of_match,
},
};
module_platform_driver(mt6323_efuse_driver);
MODULE_DESCRIPTION("MediaTek MT6323 PMIC EFUSE driver");
MODULE_LICENSE("GPL");
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