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9ac21f40c7
The DT of_device.h and of_platform.h date back to the separate of_platform_bus_type before it was 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. Link: https://lore.kernel.org/r/20230714174754.4060608-1-robh@kernel.org Signed-off-by: Rob Herring <robh@kernel.org>
142 lines
3.5 KiB
C
142 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* MMIO register bitfield-controlled multiplexer driver
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*
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* Copyright (C) 2017 Pengutronix, Philipp Zabel <kernel@pengutronix.de>
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*/
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#include <linux/bitops.h>
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#include <linux/err.h>
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#include <linux/mfd/syscon.h>
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#include <linux/module.h>
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#include <linux/mux/driver.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/property.h>
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#include <linux/regmap.h>
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static int mux_mmio_set(struct mux_control *mux, int state)
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{
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struct regmap_field **fields = mux_chip_priv(mux->chip);
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return regmap_field_write(fields[mux_control_get_index(mux)], state);
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}
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static const struct mux_control_ops mux_mmio_ops = {
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.set = mux_mmio_set,
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};
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static const struct of_device_id mux_mmio_dt_ids[] = {
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{ .compatible = "mmio-mux", },
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{ .compatible = "reg-mux", },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, mux_mmio_dt_ids);
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static int mux_mmio_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 regmap_field **fields;
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struct mux_chip *mux_chip;
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struct regmap *regmap;
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int num_fields;
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int ret;
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int i;
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if (of_device_is_compatible(np, "mmio-mux"))
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regmap = syscon_node_to_regmap(np->parent);
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else
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regmap = dev_get_regmap(dev->parent, NULL) ?: ERR_PTR(-ENODEV);
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if (IS_ERR(regmap)) {
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ret = PTR_ERR(regmap);
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dev_err(dev, "failed to get regmap: %d\n", ret);
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return ret;
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}
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ret = of_property_count_u32_elems(np, "mux-reg-masks");
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if (ret == 0 || ret % 2)
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ret = -EINVAL;
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if (ret < 0) {
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dev_err(dev, "mux-reg-masks property missing or invalid: %d\n",
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ret);
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return ret;
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}
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num_fields = ret / 2;
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mux_chip = devm_mux_chip_alloc(dev, num_fields, num_fields *
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sizeof(*fields));
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if (IS_ERR(mux_chip))
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return PTR_ERR(mux_chip);
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fields = mux_chip_priv(mux_chip);
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for (i = 0; i < num_fields; i++) {
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struct mux_control *mux = &mux_chip->mux[i];
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struct reg_field field;
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s32 idle_state = MUX_IDLE_AS_IS;
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u32 reg, mask;
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int bits;
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ret = of_property_read_u32_index(np, "mux-reg-masks",
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2 * i, ®);
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if (!ret)
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ret = of_property_read_u32_index(np, "mux-reg-masks",
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2 * i + 1, &mask);
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if (ret < 0) {
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dev_err(dev, "bitfield %d: failed to read mux-reg-masks property: %d\n",
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i, ret);
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return ret;
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}
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field.reg = reg;
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field.msb = fls(mask) - 1;
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field.lsb = ffs(mask) - 1;
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if (mask != GENMASK(field.msb, field.lsb)) {
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dev_err(dev, "bitfield %d: invalid mask 0x%x\n",
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i, mask);
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return -EINVAL;
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}
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fields[i] = devm_regmap_field_alloc(dev, regmap, field);
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if (IS_ERR(fields[i])) {
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ret = PTR_ERR(fields[i]);
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dev_err(dev, "bitfield %d: failed allocate: %d\n",
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i, ret);
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return ret;
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}
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bits = 1 + field.msb - field.lsb;
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mux->states = 1 << bits;
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of_property_read_u32_index(np, "idle-states", i,
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(u32 *)&idle_state);
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if (idle_state != MUX_IDLE_AS_IS) {
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if (idle_state < 0 || idle_state >= mux->states) {
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dev_err(dev, "bitfield: %d: out of range idle state %d\n",
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i, idle_state);
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return -EINVAL;
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}
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mux->idle_state = idle_state;
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}
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}
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mux_chip->ops = &mux_mmio_ops;
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return devm_mux_chip_register(dev, mux_chip);
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}
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static struct platform_driver mux_mmio_driver = {
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.driver = {
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.name = "mmio-mux",
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.of_match_table = mux_mmio_dt_ids,
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},
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.probe = mux_mmio_probe,
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};
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module_platform_driver(mux_mmio_driver);
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MODULE_DESCRIPTION("MMIO register bitfield-controlled multiplexer driver");
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MODULE_AUTHOR("Philipp Zabel <p.zabel@pengutronix.de>");
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MODULE_LICENSE("GPL v2");
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