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11795e02c1
The DT of_device.h and of_platform.h date back to the separate of_platform_bus_type before it as merged into the regular platform bus. As part of that merge prepping Arm DT support 13 years ago, they "temporarily" include each other. They also include platform_device.h and of.h. As a result, there's a pretty much random mix of those include files used throughout the tree. In order to detangle these headers and replace the implicit includes with struct declarations, users need to explicitly include the correct includes. Signed-off-by: Rob Herring <robh@kernel.org> Signed-off-by: Conor Dooley <conor.dooley@microchip.com> Link: https://lore.kernel.org/r/20230714175139.4067685-1-robh@kernel.org [claudiu.beznea: added link] Signed-off-by: Claudiu Beznea <claudiu.beznea@tuxon.dev>
99 lines
2.2 KiB
C
99 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* sfr.c - driver for special function registers
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*
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* Copyright (C) 2019 Bootlin.
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*
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*/
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#include <linux/mfd/syscon.h>
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#include <linux/module.h>
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#include <linux/nvmem-provider.h>
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#include <linux/random.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#define SFR_SN0 0x4c
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#define SFR_SN_SIZE 8
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struct atmel_sfr_priv {
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struct regmap *regmap;
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};
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static int atmel_sfr_read(void *context, unsigned int offset,
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void *buf, size_t bytes)
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{
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struct atmel_sfr_priv *priv = context;
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return regmap_bulk_read(priv->regmap, SFR_SN0 + offset,
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buf, bytes / 4);
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}
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static struct nvmem_config atmel_sfr_nvmem_config = {
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.name = "atmel-sfr",
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.read_only = true,
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.word_size = 4,
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.stride = 4,
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.size = SFR_SN_SIZE,
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.reg_read = atmel_sfr_read,
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};
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static int atmel_sfr_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct device_node *np = dev->of_node;
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struct nvmem_device *nvmem;
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struct atmel_sfr_priv *priv;
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u8 sn[SFR_SN_SIZE];
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int ret;
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priv = devm_kmalloc(dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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priv->regmap = syscon_node_to_regmap(np);
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if (IS_ERR(priv->regmap)) {
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dev_err(dev, "cannot get parent's regmap\n");
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return PTR_ERR(priv->regmap);
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}
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atmel_sfr_nvmem_config.dev = dev;
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atmel_sfr_nvmem_config.priv = priv;
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nvmem = devm_nvmem_register(dev, &atmel_sfr_nvmem_config);
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if (IS_ERR(nvmem)) {
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dev_err(dev, "error registering nvmem config\n");
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return PTR_ERR(nvmem);
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}
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ret = atmel_sfr_read(priv, 0, sn, SFR_SN_SIZE);
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if (ret == 0)
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add_device_randomness(sn, SFR_SN_SIZE);
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return ret;
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}
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static const struct of_device_id atmel_sfr_dt_ids[] = {
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{
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.compatible = "atmel,sama5d2-sfr",
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}, {
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.compatible = "atmel,sama5d4-sfr",
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}, {
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/* sentinel */
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},
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};
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MODULE_DEVICE_TABLE(of, atmel_sfr_dt_ids);
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static struct platform_driver atmel_sfr_driver = {
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.probe = atmel_sfr_probe,
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.driver = {
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.name = "atmel-sfr",
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.of_match_table = atmel_sfr_dt_ids,
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},
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};
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module_platform_driver(atmel_sfr_driver);
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MODULE_AUTHOR("Kamel Bouhara <kamel.bouhara@bootlin.com>");
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MODULE_DESCRIPTION("Atmel SFR SN driver for SAMA5D2/4 SoC family");
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MODULE_LICENSE("GPL v2");
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