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Commit 9408ec1a authored by Akinobu Mita's avatar Akinobu Mita Committed by Alexandre Belloni
Browse files

rtc: pcf2127: add support for spi interface 



pcf2127 has selectable I2C-bus and SPI-bus interface support.

This adds support for SPI interface.

Signed-off-by: default avatarAkinobu Mita <akinobu.mita@gmail.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: default avatarAlexandre Belloni <alexandre.belloni@free-electrons.com>
parent 907b3262

drivers/rtc/Kconfig

+10 −9
Original line number Diff line number Diff line
@@ -379,15 +379,6 @@ config RTC_DRV_X1205 
	  This driver can also be built as a module. If so, the module

	  will be called rtc-x1205.



config RTC_DRV_PCF2127

	tristate "NXP PCF2127"

	help

	  If you say yes here you get support for the NXP PCF2127/29 RTC

	  chips.



	  This driver can also be built as a module. If so, the module

	  will be called rtc-pcf2127.



config RTC_DRV_PCF8523

	tristate "NXP PCF8523"

	help
@@ -776,6 +767,16 @@ config RTC_DRV_DS3232 
	  This driver can also be built as a module.  If so, the module

	  will be called rtc-ds3232.



config RTC_DRV_PCF2127

	tristate "NXP PCF2127"

	depends on RTC_I2C_AND_SPI

	help

	  If you say yes here you get support for the NXP PCF2127/29 RTC

	  chips.



	  This driver can also be built as a module. If so, the module

	  will be called rtc-pcf2127.



comment "Platform RTC drivers"



# this 'CMOS' RTC driver is arch dependent because <asm-generic/rtc.h>

drivers/rtc/rtc-pcf2127.c

+116 −2
Original line number Diff line number Diff line 
/*

 * An I2C driver for the NXP PCF2127 RTC

 * An I2C and SPI driver for the NXP PCF2127 RTC

 * Copyright 2013 Til-Technologies

 *

 * Author: Renaud Cerrato <r.cerrato@til-technologies.fr>
@@ -14,6 +14,7 @@ 
 */



#include <linux/i2c.h>

#include <linux/spi/spi.h>

#include <linux/bcd.h>

#include <linux/rtc.h>

#include <linux/slab.h>
@@ -200,6 +201,8 @@ static const struct of_device_id pcf2127_of_match[] = { 
MODULE_DEVICE_TABLE(of, pcf2127_of_match);

#endif



#if IS_ENABLED(CONFIG_I2C)



static int pcf2127_i2c_write(void *context, const void *data, size_t count)

{

	struct device *dev = context;
@@ -311,7 +314,118 @@ static struct i2c_driver pcf2127_i2c_driver = { 
	.probe		= pcf2127_i2c_probe,

	.id_table	= pcf2127_i2c_id,

};

module_i2c_driver(pcf2127_i2c_driver);



static int pcf2127_i2c_register_driver(void)

{

	return i2c_add_driver(&pcf2127_i2c_driver);

}



static void pcf2127_i2c_unregister_driver(void)

{

	i2c_del_driver(&pcf2127_i2c_driver);

}



#else



static int pcf2127_i2c_register_driver(void)

{

	return 0;

}



static void pcf2127_i2c_unregister_driver(void)

{

}



#endif



#if IS_ENABLED(CONFIG_SPI_MASTER)



static struct spi_driver pcf2127_spi_driver;



static int pcf2127_spi_probe(struct spi_device *spi)

{

	static const struct regmap_config config = {

		.reg_bits = 8,

		.val_bits = 8,

		.read_flag_mask = 0xa0,

		.write_flag_mask = 0x20,

	};

	struct regmap *regmap;



	regmap = devm_regmap_init_spi(spi, &config);

	if (IS_ERR(regmap)) {

		dev_err(&spi->dev, "%s: regmap allocation failed: %ld\n",

			__func__, PTR_ERR(regmap));

		return PTR_ERR(regmap);

	}



	return pcf2127_probe(&spi->dev, regmap, pcf2127_spi_driver.driver.name);

}



static const struct spi_device_id pcf2127_spi_id[] = {

	{ "pcf2127", 0 },

	{ }

};

MODULE_DEVICE_TABLE(spi, pcf2127_spi_id);



static struct spi_driver pcf2127_spi_driver = {

	.driver		= {

		.name	= "rtc-pcf2127-spi",

		.of_match_table = of_match_ptr(pcf2127_of_match),

	},

	.probe		= pcf2127_spi_probe,

	.id_table	= pcf2127_spi_id,

};



static int pcf2127_spi_register_driver(void)

{

	return spi_register_driver(&pcf2127_spi_driver);

}



static void pcf2127_spi_unregister_driver(void)

{

	spi_unregister_driver(&pcf2127_spi_driver);

}



#else



static int pcf2127_spi_register_driver(void)

{

	return 0;

}



static void pcf2127_spi_unregister_driver(void)

{

}



#endif



static int __init pcf2127_init(void)

{

	int ret;



	ret = pcf2127_i2c_register_driver();

	if (ret) {

		pr_err("Failed to register pcf2127 i2c driver: %d\n", ret);

		return ret;

	}



	ret = pcf2127_spi_register_driver();

	if (ret) {

		pr_err("Failed to register pcf2127 spi driver: %d\n", ret);

		pcf2127_i2c_unregister_driver();

	}



	return ret;

}

module_init(pcf2127_init)



static void __exit pcf2127_exit(void)

{

	pcf2127_spi_unregister_driver();

	pcf2127_i2c_unregister_driver();

}

module_exit(pcf2127_exit)



MODULE_AUTHOR("Renaud Cerrato <r.cerrato@til-technologies.fr>");

MODULE_DESCRIPTION("NXP PCF2127 RTC driver");