linux-imx

// 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 = {

    .name = "at91_usart_spi",

    .of_compatible = "microchip,at91sam9g45-usart-spi",

};

​

static const struct mfd_cell at91_usart_serial_subdev = {

    .name = "atmel_usart_serial",

    .of_compatible = "atmel,at91rm9200-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",