diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/mfd/at91-usart.c | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/drivers/mfd/at91-usart.c b/drivers/mfd/at91-usart.c new file mode 100644 index 000000000..7f08cb60c --- /dev/null +++ b/drivers/mfd/at91-usart.c @@ -0,0 +1,68 @@ +// 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"); |