69 lines
1.6 KiB
C
69 lines
1.6 KiB
C
|
// SPDX-License-Identifier: GPL-2.0
|
||
|
|
/*
|
||
|
|
* Driver for AT91 USART
|
||
|
|
*
|
||
|
|
* Copyright (C) 2018 Microchip Technology
|
||
|
|
*
|
||
|
|
* Author: Radu Pirea <radu.pirea@microchip.com>
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <dt-bindings/mfd/at91-usart.h>
|
||
|
|
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/mfd/core.h>
|
||
|
|
#include <linux/of.h>
|
||
|
|
#include <linux/property.h>
|
||
|
|
|
||
|
|
static const struct mfd_cell at91_usart_spi_subdev =
|
||
|
|
MFD_CELL_NAME("at91_usart_spi");
|
||
|
|
|
||
|
|
static const struct mfd_cell at91_usart_serial_subdev =
|
||
|
|
MFD_CELL_NAME("atmel_usart_serial");
|
||
|
|
|
||
|
|
static int at91_usart_mode_probe(struct platform_device *pdev)
|
||
|
|
{
|
||
|
|
const struct mfd_cell *cell;
|
||
|
|
u32 opmode = AT91_USART_MODE_SERIAL;
|
||
|
|
|
||
|
|
device_property_read_u32(&pdev->dev, "atmel,usart-mode", &opmode);
|
||
|
|
|
||
|
|
switch (opmode) {
|
||
|
|
case AT91_USART_MODE_SPI:
|
||
|
|
cell = &at91_usart_spi_subdev;
|
||
|
|
break;
|
||
|
|
case AT91_USART_MODE_SERIAL:
|
||
|
|
cell = &at91_usart_serial_subdev;
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
dev_err(&pdev->dev, "atmel,usart-mode has an invalid value %u\n",
|
||
|
|
opmode);
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
|
||
|
|
return devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_AUTO, cell, 1,
|
||
|
|
NULL, 0, NULL);
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct of_device_id at91_usart_mode_of_match[] = {
|
||
|
|
{ .compatible = "atmel,at91rm9200-usart" },
|
||
|
|
{ .compatible = "atmel,at91sam9260-usart" },
|
||
|
|
{ /* sentinel */ }
|
||
|
|
};
|
||
|
|
|
||
|
|
MODULE_DEVICE_TABLE(of, at91_usart_mode_of_match);
|
||
|
|
|
||
|
|
static struct platform_driver at91_usart_mfd = {
|
||
|
|
.probe = at91_usart_mode_probe,
|
||
|
|
.driver = {
|
||
|
|
.name = "at91_usart_mode",
|
||
|
|
.of_match_table = at91_usart_mode_of_match,
|
||
|
|
},
|
||
|
|
};
|
||
|
|
|
||
|
|
module_platform_driver(at91_usart_mfd);
|
||
|
|
|
||
|
|
MODULE_AUTHOR("Radu Pirea <radu.pirea@microchip.com>");
|
||
|
|
MODULE_DESCRIPTION("AT91 USART MFD driver");
|
||
|
|
MODULE_LICENSE("GPL v2");
|