mirror of
https://github.com/torvalds/linux.git
synced 2024-12-26 12:52:30 +00:00
2cc3b37f5b
Binding for fixed NVMEM cells defined directly as NVMEM device subnodes
has been deprecated. It has been replaced by the "fixed-layout" NVMEM
layout binding.
New syntax is meant to be clearer and should help avoiding imprecise
bindings.
NVMEM subsystem already supports the new binding. It should be a good
idea to limit support for old syntax to existing drivers that actually
support & use it (we can't break backward compatibility!). That way we
additionally encourage new bindings & drivers to ignore deprecated
binding.
It wasn't clear (to me) if rtc and w1 code actually uses old syntax
fixed cells. I enabled them to don't risk any breakage.
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
[for meson-{efuse,mx-efuse}.c]
Acked-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
[for mtk-efuse.c, nvmem/core.c, nvmem-provider.h]
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
[MT8192, MT8195 Chromebooks]
Tested-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
[for microchip-otpc.c]
Reviewed-by: Claudiu Beznea <claudiu.beznea@microchip.com>
[SAMA7G5-EK]
Tested-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Acked-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20231020105545.216052-3-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
82 lines
1.8 KiB
C
82 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Apple SoC eFuse driver
|
|
*
|
|
* Copyright (C) The Asahi Linux Contributors
|
|
*/
|
|
|
|
#include <linux/io.h>
|
|
#include <linux/mod_devicetable.h>
|
|
#include <linux/module.h>
|
|
#include <linux/nvmem-provider.h>
|
|
#include <linux/platform_device.h>
|
|
|
|
struct apple_efuses_priv {
|
|
void __iomem *fuses;
|
|
};
|
|
|
|
static int apple_efuses_read(void *context, unsigned int offset, void *val,
|
|
size_t bytes)
|
|
{
|
|
struct apple_efuses_priv *priv = context;
|
|
u32 *dst = val;
|
|
|
|
while (bytes >= sizeof(u32)) {
|
|
*dst++ = readl_relaxed(priv->fuses + offset);
|
|
bytes -= sizeof(u32);
|
|
offset += sizeof(u32);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int apple_efuses_probe(struct platform_device *pdev)
|
|
{
|
|
struct apple_efuses_priv *priv;
|
|
struct resource *res;
|
|
struct nvmem_config config = {
|
|
.dev = &pdev->dev,
|
|
.add_legacy_fixed_of_cells = true,
|
|
.read_only = true,
|
|
.reg_read = apple_efuses_read,
|
|
.stride = sizeof(u32),
|
|
.word_size = sizeof(u32),
|
|
.name = "apple_efuses_nvmem",
|
|
.id = NVMEM_DEVID_AUTO,
|
|
.root_only = true,
|
|
};
|
|
|
|
priv = devm_kzalloc(config.dev, sizeof(*priv), GFP_KERNEL);
|
|
if (!priv)
|
|
return -ENOMEM;
|
|
|
|
priv->fuses = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
|
|
if (IS_ERR(priv->fuses))
|
|
return PTR_ERR(priv->fuses);
|
|
|
|
config.priv = priv;
|
|
config.size = resource_size(res);
|
|
|
|
return PTR_ERR_OR_ZERO(devm_nvmem_register(config.dev, &config));
|
|
}
|
|
|
|
static const struct of_device_id apple_efuses_of_match[] = {
|
|
{ .compatible = "apple,efuses", },
|
|
{}
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(of, apple_efuses_of_match);
|
|
|
|
static struct platform_driver apple_efuses_driver = {
|
|
.driver = {
|
|
.name = "apple_efuses",
|
|
.of_match_table = apple_efuses_of_match,
|
|
},
|
|
.probe = apple_efuses_probe,
|
|
};
|
|
|
|
module_platform_driver(apple_efuses_driver);
|
|
|
|
MODULE_AUTHOR("Sven Peter <sven@svenpeter.dev>");
|
|
MODULE_LICENSE("GPL");
|