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https://github.com/edk2-porting/linux-next.git
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564e7f87a0
Possibly, provider driver initialization is later than consumer driver. Use function subsys_initcall to initialize NVMEM provider early to ensure NVMEM consumer doesn't need to -EPROBE_DEFER. Signed-off-by: Andrew-CT Chen <andrew-ct.chen@mediatek.com> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
111 lines
2.6 KiB
C
111 lines
2.6 KiB
C
/*
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* Copyright (c) 2015 MediaTek Inc.
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* Author: Andrew-CT Chen <andrew-ct.chen@mediatek.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/device.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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static struct regmap_config mtk_regmap_config = {
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.reg_bits = 32,
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.val_bits = 32,
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.reg_stride = 4,
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};
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static int mtk_efuse_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct resource *res;
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struct nvmem_device *nvmem;
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struct nvmem_config *econfig;
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struct regmap *regmap;
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void __iomem *base;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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base = devm_ioremap_resource(dev, res);
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if (IS_ERR(base))
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return PTR_ERR(base);
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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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mtk_regmap_config.max_register = resource_size(res) - 1;
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regmap = devm_regmap_init_mmio(dev, base, &mtk_regmap_config);
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if (IS_ERR(regmap)) {
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dev_err(dev, "regmap init failed\n");
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return PTR_ERR(regmap);
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}
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econfig->dev = dev;
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econfig->owner = THIS_MODULE;
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nvmem = nvmem_register(econfig);
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if (IS_ERR(nvmem))
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return PTR_ERR(nvmem);
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platform_set_drvdata(pdev, nvmem);
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return 0;
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}
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static int mtk_efuse_remove(struct platform_device *pdev)
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{
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struct nvmem_device *nvmem = platform_get_drvdata(pdev);
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return nvmem_unregister(nvmem);
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}
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static const struct of_device_id mtk_efuse_of_match[] = {
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{ .compatible = "mediatek,mt8173-efuse",},
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{ .compatible = "mediatek,efuse",},
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{/* sentinel */},
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};
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MODULE_DEVICE_TABLE(of, mtk_efuse_of_match);
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static struct platform_driver mtk_efuse_driver = {
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.probe = mtk_efuse_probe,
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.remove = mtk_efuse_remove,
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.driver = {
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.name = "mediatek,efuse",
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.of_match_table = mtk_efuse_of_match,
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},
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};
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static int __init mtk_efuse_init(void)
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{
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int ret;
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ret = platform_driver_register(&mtk_efuse_driver);
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if (ret) {
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pr_err("Failed to register efuse driver\n");
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return ret;
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}
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return 0;
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}
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static void __exit mtk_efuse_exit(void)
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{
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return platform_driver_unregister(&mtk_efuse_driver);
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}
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subsys_initcall(mtk_efuse_init);
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module_exit(mtk_efuse_exit);
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MODULE_AUTHOR("Andrew-CT Chen <andrew-ct.chen@mediatek.com>");
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MODULE_DESCRIPTION("Mediatek EFUSE driver");
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MODULE_LICENSE("GPL v2");
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