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rtc: rx6110: add i2c support 

The RX6110 also supports I2C, so this patch adds support for it to the
driver.

This also renames the SPI specific functions and variables to include
`_spi_` in their names.

Signed-off-by: Claudius Heine <ch@denx.de>
Signed-off-by: Henning Schild <henning.schild@siemens.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20201117121817.953924-3-ch@denx.de
This commit is contained in:
Claudius Heine 2020-11-17 13:18:17 +01:00 committed by Alexandre Belloni
parent 7e6066ca1f
commit afa819c2c6
2 changed files with 153 additions and 32 deletions
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20
drivers/rtc/Kconfig
View File

@ -817,15 +817,6 @@ config RTC_DRV_RX4581
This driver can also be built as a module. If so the module
will be called rtc-rx4581.
config RTC_DRV_RX6110
tristate "Epson RX-6110"
select REGMAP_SPI
help
If you say yes here you will get support for the Epson RX-6110.
This driver can also be built as a module. If so the module
will be called rtc-rx6110.
config RTC_DRV_RS5C348
tristate "Ricoh RS5C348A/B"
help
@ -936,6 +927,17 @@ config RTC_DRV_RV3029_HWMON
Say Y here if you want to expose temperature sensor data on
rtc-rv3029.
config RTC_DRV_RX6110
tristate "Epson RX-6110"
depends on RTC_I2C_AND_SPI
select REGMAP_SPI if SPI_MASTER
select REGMAP_I2C if I2C
help
If you say yes here you will get support for the Epson RX-6110.
This driver can also be built as a module. If so the module
will be called rtc-rx6110.
comment "Platform RTC drivers"
# this 'CMOS' RTC driver is arch dependent because it requires

165
drivers/rtc/rtc-rx6110.c
View File

@ -16,6 +16,7 @@
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/spi/spi.h>
#include <linux/i2c.h>
/* RX-6110 Register definitions */
#define RX6110_REG_SEC 0x10
@ -310,6 +311,27 @@ static const struct rtc_class_ops rx6110_rtc_ops = {
.set_time = rx6110_set_time,
};
static int rx6110_probe(struct rx6110_data *rx6110, struct device *dev)
{
int err;
rx6110->rtc = devm_rtc_device_register(dev,
RX6110_DRIVER_NAME,
&rx6110_rtc_ops, THIS_MODULE);
if (IS_ERR(rx6110->rtc))
return PTR_ERR(rx6110->rtc);
err = rx6110_init(rx6110);
if (err)
return err;
rx6110->rtc->max_user_freq = 1;
return 0;
}
#ifdef CONFIG_SPI_MASTER
static struct regmap_config regmap_spi_config = {
.reg_bits = 8,
.val_bits = 8,
@ -318,13 +340,12 @@ static struct regmap_config regmap_spi_config = {
};
/**
* rx6110_probe - initialize rtc driver
* rx6110_spi_probe - initialize rtc driver
* @spi: pointer to spi device
*/
static int rx6110_probe(struct spi_device *spi)
static int rx6110_spi_probe(struct spi_device *spi)
{
struct rx6110_data *rx6110;
int err;
if ((spi->bits_per_word && spi->bits_per_word != 8) ||
(spi->max_speed_hz > 2000000) ||
@ -346,27 +367,14 @@ static int rx6110_probe(struct spi_device *spi)
spi_set_drvdata(spi, rx6110);
rx6110->rtc = devm_rtc_device_register(&spi->dev,
RX6110_DRIVER_NAME,
&rx6110_rtc_ops, THIS_MODULE);
if (IS_ERR(rx6110->rtc))
return PTR_ERR(rx6110->rtc);
err = rx6110_init(rx6110);
if (err)
return err;
rx6110->rtc->max_user_freq = 1;
return 0;
return rx6110_probe(rx6110, &spi->dev);
}
static const struct spi_device_id rx6110_id[] = {
static const struct spi_device_id rx6110_spi_id[] = {
{ "rx6110", 0 },
{ }
};
MODULE_DEVICE_TABLE(spi, rx6110_id);
MODULE_DEVICE_TABLE(spi, rx6110_spi_id);
static const struct of_device_id rx6110_spi_of_match[] = {
{ .compatible = "epson,rx6110" },
@ -374,16 +382,127 @@ static const struct of_device_id rx6110_spi_of_match[] = {
};
MODULE_DEVICE_TABLE(of, rx6110_spi_of_match);
static struct spi_driver rx6110_driver = {
static struct spi_driver rx6110_spi_driver = {
.driver = {
.name = RX6110_DRIVER_NAME,
.of_match_table = of_match_ptr(rx6110_spi_of_match),
},
.probe = rx6110_probe,
.id_table = rx6110_id,
.probe = rx6110_spi_probe,
.id_table = rx6110_spi_id,
};
module_spi_driver(rx6110_driver);
static int rx6110_spi_register(void)
{
return spi_register_driver(&rx6110_spi_driver);
}
static void rx6110_spi_unregister(void)
{
spi_unregister_driver(&rx6110_spi_driver);
}
#else
static int rx6110_spi_register(void)
{
return 0;
}
static void rx6110_spi_unregister(void)
{
}
#endif /* CONFIG_SPI_MASTER */
#ifdef CONFIG_I2C
static struct regmap_config regmap_i2c_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = RX6110_REG_IRQ,
.read_flag_mask = 0x80,
};
static int rx6110_i2c_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
struct rx6110_data *rx6110;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA
| I2C_FUNC_SMBUS_I2C_BLOCK)) {
dev_err(&adapter->dev,
"doesn't support required functionality\n");
return -EIO;
}
rx6110 = devm_kzalloc(&client->dev, sizeof(*rx6110), GFP_KERNEL);
if (!rx6110)
return -ENOMEM;
rx6110->regmap = devm_regmap_init_i2c(client, &regmap_i2c_config);
if (IS_ERR(rx6110->regmap)) {
dev_err(&client->dev, "regmap init failed for rtc rx6110\n");
return PTR_ERR(rx6110->regmap);
}
i2c_set_clientdata(client, rx6110);
return rx6110_probe(rx6110, &client->dev);
}
static const struct i2c_device_id rx6110_i2c_id[] = {
{ "rx6110", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, rx6110_i2c_id);
static struct i2c_driver rx6110_i2c_driver = {
.driver = {
.name = RX6110_DRIVER_NAME,
},
.probe = rx6110_i2c_probe,
.id_table = rx6110_i2c_id,
};
static int rx6110_i2c_register(void)
{
return i2c_add_driver(&rx6110_i2c_driver);
}
static void rx6110_i2c_unregister(void)
{
i2c_del_driver(&rx6110_i2c_driver);
}
#else
static int rx6110_i2c_register(void)
{
return 0;
}
static void rx6110_i2c_unregister(void)
{
}
#endif /* CONFIG_I2C */
static int __init rx6110_module_init(void)
{
int ret;
ret = rx6110_spi_register();
if (ret)
return ret;
ret = rx6110_i2c_register();
if (ret)
rx6110_spi_unregister();
return ret;
}
module_init(rx6110_module_init);
static void __exit rx6110_module_exit(void)
{
rx6110_spi_unregister();
rx6110_i2c_unregister();
}
module_exit(rx6110_module_exit);
MODULE_AUTHOR("Val Krutov <val.krutov@erd.epson.com>");
MODULE_DESCRIPTION("RX-6110 SA RTC driver");