1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Driver for AT91 USART
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (C) 2018 Microchip Technology
6*4882a593Smuzhiyun *
7*4882a593Smuzhiyun * Author: Radu Pirea <radu.pirea@microchip.com>
8*4882a593Smuzhiyun *
9*4882a593Smuzhiyun */
10*4882a593Smuzhiyun
11*4882a593Smuzhiyun #include <dt-bindings/mfd/at91-usart.h>
12*4882a593Smuzhiyun
13*4882a593Smuzhiyun #include <linux/module.h>
14*4882a593Smuzhiyun #include <linux/mfd/core.h>
15*4882a593Smuzhiyun #include <linux/of.h>
16*4882a593Smuzhiyun #include <linux/property.h>
17*4882a593Smuzhiyun
18*4882a593Smuzhiyun static const struct mfd_cell at91_usart_spi_subdev = {
19*4882a593Smuzhiyun .name = "at91_usart_spi",
20*4882a593Smuzhiyun .of_compatible = "microchip,at91sam9g45-usart-spi",
21*4882a593Smuzhiyun };
22*4882a593Smuzhiyun
23*4882a593Smuzhiyun static const struct mfd_cell at91_usart_serial_subdev = {
24*4882a593Smuzhiyun .name = "atmel_usart_serial",
25*4882a593Smuzhiyun .of_compatible = "atmel,at91rm9200-usart-serial",
26*4882a593Smuzhiyun };
27*4882a593Smuzhiyun
at91_usart_mode_probe(struct platform_device * pdev)28*4882a593Smuzhiyun static int at91_usart_mode_probe(struct platform_device *pdev)
29*4882a593Smuzhiyun {
30*4882a593Smuzhiyun const struct mfd_cell *cell;
31*4882a593Smuzhiyun u32 opmode = AT91_USART_MODE_SERIAL;
32*4882a593Smuzhiyun
33*4882a593Smuzhiyun device_property_read_u32(&pdev->dev, "atmel,usart-mode", &opmode);
34*4882a593Smuzhiyun
35*4882a593Smuzhiyun switch (opmode) {
36*4882a593Smuzhiyun case AT91_USART_MODE_SPI:
37*4882a593Smuzhiyun cell = &at91_usart_spi_subdev;
38*4882a593Smuzhiyun break;
39*4882a593Smuzhiyun case AT91_USART_MODE_SERIAL:
40*4882a593Smuzhiyun cell = &at91_usart_serial_subdev;
41*4882a593Smuzhiyun break;
42*4882a593Smuzhiyun default:
43*4882a593Smuzhiyun dev_err(&pdev->dev, "atmel,usart-mode has an invalid value %u\n",
44*4882a593Smuzhiyun opmode);
45*4882a593Smuzhiyun return -EINVAL;
46*4882a593Smuzhiyun }
47*4882a593Smuzhiyun
48*4882a593Smuzhiyun return devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_AUTO, cell, 1,
49*4882a593Smuzhiyun NULL, 0, NULL);
50*4882a593Smuzhiyun }
51*4882a593Smuzhiyun
52*4882a593Smuzhiyun static const struct of_device_id at91_usart_mode_of_match[] = {
53*4882a593Smuzhiyun { .compatible = "atmel,at91rm9200-usart" },
54*4882a593Smuzhiyun { .compatible = "atmel,at91sam9260-usart" },
55*4882a593Smuzhiyun { /* sentinel */ }
56*4882a593Smuzhiyun };
57*4882a593Smuzhiyun
58*4882a593Smuzhiyun MODULE_DEVICE_TABLE(of, at91_usart_mode_of_match);
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun static struct platform_driver at91_usart_mfd = {
61*4882a593Smuzhiyun .probe = at91_usart_mode_probe,
62*4882a593Smuzhiyun .driver = {
63*4882a593Smuzhiyun .name = "at91_usart_mode",
64*4882a593Smuzhiyun .of_match_table = at91_usart_mode_of_match,
65*4882a593Smuzhiyun },
66*4882a593Smuzhiyun };
67*4882a593Smuzhiyun
68*4882a593Smuzhiyun module_platform_driver(at91_usart_mfd);
69*4882a593Smuzhiyun
70*4882a593Smuzhiyun MODULE_AUTHOR("Radu Pirea <radu.pirea@microchip.com>");
71*4882a593Smuzhiyun MODULE_DESCRIPTION("AT91 USART MFD driver");
72*4882a593Smuzhiyun MODULE_LICENSE("GPL v2");
73