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> |
15 | #include <linux/of.h> |
16 | #include <linux/property.h> |
17 | |
18 | static const struct mfd_cell at91_usart_spi_subdev = |
19 | MFD_CELL_NAME("at91_usart_spi" ); |
20 | |
21 | static const struct mfd_cell at91_usart_serial_subdev = |
22 | MFD_CELL_NAME("atmel_usart_serial" ); |
23 | |
24 | static int at91_usart_mode_probe(struct platform_device *pdev) |
25 | { |
26 | const struct mfd_cell *cell; |
27 | u32 opmode = AT91_USART_MODE_SERIAL; |
28 | |
29 | device_property_read_u32(dev: &pdev->dev, propname: "atmel,usart-mode" , val: &opmode); |
30 | |
31 | switch (opmode) { |
32 | case AT91_USART_MODE_SPI: |
33 | cell = &at91_usart_spi_subdev; |
34 | break; |
35 | case AT91_USART_MODE_SERIAL: |
36 | cell = &at91_usart_serial_subdev; |
37 | break; |
38 | default: |
39 | dev_err(&pdev->dev, "atmel,usart-mode has an invalid value %u\n" , |
40 | opmode); |
41 | return -EINVAL; |
42 | } |
43 | |
44 | return devm_mfd_add_devices(dev: &pdev->dev, PLATFORM_DEVID_AUTO, cells: cell, n_devs: 1, |
45 | NULL, irq_base: 0, NULL); |
46 | } |
47 | |
48 | static const struct of_device_id at91_usart_mode_of_match[] = { |
49 | { .compatible = "atmel,at91rm9200-usart" }, |
50 | { .compatible = "atmel,at91sam9260-usart" }, |
51 | { /* sentinel */ } |
52 | }; |
53 | |
54 | MODULE_DEVICE_TABLE(of, at91_usart_mode_of_match); |
55 | |
56 | static struct platform_driver at91_usart_mfd = { |
57 | .probe = at91_usart_mode_probe, |
58 | .driver = { |
59 | .name = "at91_usart_mode" , |
60 | .of_match_table = at91_usart_mode_of_match, |
61 | }, |
62 | }; |
63 | |
64 | module_platform_driver(at91_usart_mfd); |
65 | |
66 | MODULE_AUTHOR("Radu Pirea <radu.pirea@microchip.com>" ); |
67 | MODULE_DESCRIPTION("AT91 USART MFD driver" ); |
68 | MODULE_LICENSE("GPL v2" ); |
69 | |