diff options
| author | Radu Pirea <radu.pirea@microchip.com> | 2018-07-13 19:47:33 +0300 |
|---|---|---|
| committer | Lee Jones <lee.jones@linaro.org> | 2018-09-10 18:07:24 +0300 |
| commit | 7d3aa342cef7aa3721bab5157a84bb3d6acce437 (patch) | |
| tree | 17aafc20ced7522af0cda151fb0b0e3cf938ce51 /drivers/mfd/at91-usart.c | |
| parent | a785ce4c6d6c1e8e120a13a100edbb31b447675a (diff) | |
| download | linux-7d3aa342cef7aa3721bab5157a84bb3d6acce437.tar.xz | |
mfd: at91-usart: Add MFD driver for USART
This MFD driver is just a wrapper over atmel_serial driver and
spi-at91-usart driver. Selection of one of the drivers is based on a
property from device tree. If the property is not specified, the default
driver is atmel_serial.
Signed-off-by: Radu Pirea <radu.pirea@microchip.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Diffstat (limited to 'drivers/mfd/at91-usart.c')
| -rw-r--r-- | drivers/mfd/at91-usart.c | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/drivers/mfd/at91-usart.c b/drivers/mfd/at91-usart.c new file mode 100644 index 000000000000..a4b9929c156f --- /dev/null +++ b/drivers/mfd/at91-usart.c @@ -0,0 +1,71 @@ +// 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/property.h> + +static struct mfd_cell at91_usart_spi_subdev = { + .name = "at91_usart_spi", + .of_compatible = "microchip,at91sam9g45-usart-spi", + }; + +static 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) +{ + 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"); |