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1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* | |
3 | * Driver for AT91 USART | |
4 | * | |
5 | * Copyright (C) 2018 Microchip Technology | |
6 | * | |
7 | * Author: Radu Pirea <radu.pirea@microchip.com> | |
8 | * | |
9 | */ | |
10 | ||
11 | #include <dt-bindings/mfd/at91-usart.h> | |
12 | ||
13 | #include <linux/module.h> | |
14 | #include <linux/mfd/core.h> | |
65b80dff | 15 | #include <linux/of.h> |
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16 | #include <linux/property.h> |
17 | ||
10cffde4 AL |
18 | static const struct mfd_cell at91_usart_spi_subdev = { |
19 | .name = "at91_usart_spi", | |
20 | .of_compatible = "microchip,at91sam9g45-usart-spi", | |
21 | }; | |
7d3aa342 | 22 | |
10cffde4 AL |
23 | static const struct mfd_cell at91_usart_serial_subdev = { |
24 | .name = "atmel_usart_serial", | |
25 | .of_compatible = "atmel,at91rm9200-usart-serial", | |
26 | }; | |
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27 | |
28 | static int at91_usart_mode_probe(struct platform_device *pdev) | |
29 | { | |
c0056bfe | 30 | const struct mfd_cell *cell; |
7d3aa342 RP |
31 | u32 opmode = AT91_USART_MODE_SERIAL; |
32 | ||
33 | device_property_read_u32(&pdev->dev, "atmel,usart-mode", &opmode); | |
34 | ||
35 | switch (opmode) { | |
36 | case AT91_USART_MODE_SPI: | |
c0056bfe | 37 | cell = &at91_usart_spi_subdev; |
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38 | break; |
39 | case AT91_USART_MODE_SERIAL: | |
c0056bfe | 40 | cell = &at91_usart_serial_subdev; |
7d3aa342 RP |
41 | break; |
42 | default: | |
43 | dev_err(&pdev->dev, "atmel,usart-mode has an invalid value %u\n", | |
44 | opmode); | |
45 | return -EINVAL; | |
46 | } | |
47 | ||
c0056bfe | 48 | return devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_AUTO, cell, 1, |
7d3aa342 RP |
49 | NULL, 0, NULL); |
50 | } | |
51 | ||
52 | static const struct of_device_id at91_usart_mode_of_match[] = { | |
53 | { .compatible = "atmel,at91rm9200-usart" }, | |
54 | { .compatible = "atmel,at91sam9260-usart" }, | |
55 | { /* sentinel */ } | |
56 | }; | |
57 | ||
58 | MODULE_DEVICE_TABLE(of, at91_usart_mode_of_match); | |
59 | ||
60 | static struct platform_driver at91_usart_mfd = { | |
61 | .probe = at91_usart_mode_probe, | |
62 | .driver = { | |
63 | .name = "at91_usart_mode", | |
64 | .of_match_table = at91_usart_mode_of_match, | |
65 | }, | |
66 | }; | |
67 | ||
68 | module_platform_driver(at91_usart_mfd); | |
69 | ||
70 | MODULE_AUTHOR("Radu Pirea <radu.pirea@microchip.com>"); | |
71 | MODULE_DESCRIPTION("AT91 USART MFD driver"); | |
72 | MODULE_LICENSE("GPL v2"); |