1 // SPDX-License-Identifier: GPL-2.0
3  * MMIO register bitfield-controlled multiplexer driver
20 	struct regmap_field **fields = mux_chip_priv(mux->chip);  in mux_mmio_set()
30 	{ .compatible = "mmio-mux", },
31 	{ .compatible = "reg-mux", },
38 	struct device *dev = &pdev->dev;  in mux_mmio_probe()
39 	struct device_node *np = dev->of_node;  in mux_mmio_probe()
47 	if (of_device_is_compatible(np, "mmio-mux")) {  in mux_mmio_probe()
48 		regmap = syscon_node_to_regmap(np->parent);  in mux_mmio_probe()
52 		if (IS_ERR(regmap) && regmap != ERR_PTR(-EPROBE_DEFER)) {  in mux_mmio_probe()
53 			regmap = dev_get_regmap(dev->parent, NULL);  in mux_mmio_probe()
55 				regmap = ERR_PTR(-ENODEV);  in mux_mmio_probe()
62 	ret = of_property_count_u32_elems(np, "mux-reg-masks");  in mux_mmio_probe()
64 		ret = -EINVAL;  in mux_mmio_probe()
66 		dev_err(dev, "mux-reg-masks property missing or invalid: %d\n",  in mux_mmio_probe()
80 		struct mux_control *mux = &mux_chip->mux[i];  in mux_mmio_probe()
86 		ret = of_property_read_u32_index(np, "mux-reg-masks",  in mux_mmio_probe()
89 			ret = of_property_read_u32_index(np, "mux-reg-masks",  in mux_mmio_probe()
92 			dev_err(dev, "bitfield %d: failed to read mux-reg-masks property: %d\n",  in mux_mmio_probe()
98 		field.msb = fls(mask) - 1;  in mux_mmio_probe()
99 		field.lsb = ffs(mask) - 1;  in mux_mmio_probe()
104 			return -EINVAL;  in mux_mmio_probe()
115 		bits = 1 + field.msb - field.lsb;  in mux_mmio_probe()
116 		mux->states = 1 << bits;  in mux_mmio_probe()
118 		of_property_read_u32_index(np, "idle-states", i,  in mux_mmio_probe()
121 			if (idle_state < 0 || idle_state >= mux->states) {  in mux_mmio_probe()
122 				dev_err(dev, "bitfield: %d: out of range idle state %d\n",  in mux_mmio_probe()
124 				return -EINVAL;  in mux_mmio_probe()
127 			mux->idle_state = idle_state;  in mux_mmio_probe()
131 	mux_chip->ops = &mux_mmio_ops;  in mux_mmio_probe()
138 		.name = "mmio-mux",
145 MODULE_DESCRIPTION("MMIO register bitfield-controlled multiplexer driver");