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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 It has been replaced by the "fixed-layout" NVMEM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>
122 lines
2.8 KiB
C
122 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Amlogic Meson GX eFuse Driver
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*
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* Copyright (c) 2016 Endless Computers, Inc.
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* Author: Carlo Caione <carlo@endlessm.com>
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*/
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#include <linux/clk.h>
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#include <linux/module.h>
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#include <linux/nvmem-provider.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/firmware/meson/meson_sm.h>
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static int meson_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 meson_sm_firmware *fw = context;
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return meson_sm_call_read(fw, (u8 *)val, bytes, SM_EFUSE_READ, offset,
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bytes, 0, 0, 0);
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}
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static int meson_efuse_write(void *context, unsigned int offset,
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void *val, size_t bytes)
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{
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struct meson_sm_firmware *fw = context;
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return meson_sm_call_write(fw, (u8 *)val, bytes, SM_EFUSE_WRITE, offset,
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bytes, 0, 0, 0);
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}
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static const struct of_device_id meson_efuse_match[] = {
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{ .compatible = "amlogic,meson-gxbb-efuse", },
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{ /* sentinel */ },
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};
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MODULE_DEVICE_TABLE(of, meson_efuse_match);
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static int meson_efuse_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct meson_sm_firmware *fw;
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struct device_node *sm_np;
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struct nvmem_device *nvmem;
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struct nvmem_config *econfig;
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struct clk *clk;
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unsigned int size;
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int ret;
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sm_np = of_parse_phandle(pdev->dev.of_node, "secure-monitor", 0);
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if (!sm_np) {
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dev_err(&pdev->dev, "no secure-monitor node\n");
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return -ENODEV;
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}
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fw = meson_sm_get(sm_np);
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of_node_put(sm_np);
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if (!fw)
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return -EPROBE_DEFER;
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clk = devm_clk_get(dev, NULL);
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if (IS_ERR(clk)) {
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ret = PTR_ERR(clk);
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if (ret != -EPROBE_DEFER)
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dev_err(dev, "failed to get efuse gate");
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return ret;
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}
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ret = clk_prepare_enable(clk);
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if (ret) {
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dev_err(dev, "failed to enable gate");
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return ret;
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}
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ret = devm_add_action_or_reset(dev,
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(void(*)(void *))clk_disable_unprepare,
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clk);
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if (ret) {
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dev_err(dev, "failed to add disable callback");
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return ret;
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}
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if (meson_sm_call(fw, SM_EFUSE_USER_MAX, &size, 0, 0, 0, 0, 0) < 0) {
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dev_err(dev, "failed to get max user");
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return -EINVAL;
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}
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econfig = devm_kzalloc(dev, sizeof(*econfig), GFP_KERNEL);
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if (!econfig)
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return -ENOMEM;
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econfig->dev = dev;
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econfig->name = dev_name(dev);
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econfig->add_legacy_fixed_of_cells = true;
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econfig->stride = 1;
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econfig->word_size = 1;
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econfig->reg_read = meson_efuse_read;
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econfig->reg_write = meson_efuse_write;
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econfig->size = size;
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econfig->priv = fw;
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nvmem = devm_nvmem_register(&pdev->dev, econfig);
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return PTR_ERR_OR_ZERO(nvmem);
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}
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static struct platform_driver meson_efuse_driver = {
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.probe = meson_efuse_probe,
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.driver = {
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.name = "meson-efuse",
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.of_match_table = meson_efuse_match,
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},
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};
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module_platform_driver(meson_efuse_driver);
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MODULE_AUTHOR("Carlo Caione <carlo@endlessm.com>");
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MODULE_DESCRIPTION("Amlogic Meson GX NVMEM driver");
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MODULE_LICENSE("GPL v2");
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