drivers/reset/reset-scmi.c

1 // SPDX-License-Identifier: GPL-2.0
3  * ARM System Control and Management Interface (ARM SCMI) reset driver
5  * Copyright (C) 2019-2021 ARM Ltd.
11 #include <linux/reset-controller.h>
17  * struct scmi_reset_data - reset controller information structure
18  * @rcdev: reset controller entity
27 #define to_scmi_handle(p)	(to_scmi_reset_data(p)->ph)
30  * scmi_reset_assert() - assert device reset
31  * @rcdev: reset controller entity
32  * @id: ID of the reset to be asserted
34  * This function implements the reset driver op to assert a device's reset
44 	return reset_ops->assert(ph, id);  in scmi_reset_assert()
48  * scmi_reset_deassert() - deassert device reset
49  * @rcdev: reset controller entity
50  * @id: ID of the reset to be deasserted
52  * This function implements the reset driver op to deassert a device's reset
62 	return reset_ops->deassert(ph, id);  in scmi_reset_deassert()
66  * scmi_reset_reset() - reset the device
67  * @rcdev: reset controller entity
68  * @id: ID of the reset signal to be reset(assert + deassert)
70  * This function implements the reset driver op to trigger a device's
71  * reset signal using the ARM SCMI protocol.
80 	return reset_ops->reset(ph, id);  in scmi_reset_reset()
86 	.reset		= scmi_reset_reset,
92 	struct device *dev = &sdev->dev;  in scmi_reset_probe()
93 	struct device_node *np = dev->of_node;  in scmi_reset_probe()
94 	const struct scmi_handle *handle = sdev->handle;  in scmi_reset_probe()
98 		return -ENODEV;  in scmi_reset_probe()
100 	reset_ops = handle->devm_protocol_get(sdev, SCMI_PROTOCOL_RESET, &ph);  in scmi_reset_probe()
106 		return -ENOMEM;  in scmi_reset_probe()
108 	data->rcdev.ops = &scmi_reset_ops;  in scmi_reset_probe()
109 	data->rcdev.owner = THIS_MODULE;  in scmi_reset_probe()
110 	data->rcdev.of_node = np;  in scmi_reset_probe()
111 	data->rcdev.nr_resets = reset_ops->num_domains_get(ph);  in scmi_reset_probe()
112 	data->ph = ph;  in scmi_reset_probe()
114 	return devm_reset_controller_register(dev, &data->rcdev);  in scmi_reset_probe()
118 	{ SCMI_PROTOCOL_RESET, "reset" },
124 	.name = "scmi-reset",
131 MODULE_DESCRIPTION("ARM SCMI reset controller driver");