* [PATCH v3 2/2] rtc: rx6110: add i2c support
2020-11-17 12:18 [PATCH v3 0/2] Adding I2C support to RX6110 RTC Claudius Heine
2020-11-17 12:18 ` [PATCH v3 1/2] rtc: Kconfig: Fix typo in help message of rx 6110 Claudius Heine
@ 2020-11-17 12:18 ` Claudius Heine
2020-11-17 19:32 ` [PATCH v3 0/2] Adding I2C support to RX6110 RTC Alexandre Belloni
2 siblings, 0 replies; 4+ messages in thread
From: Claudius Heine @ 2020-11-17 12:18 UTC (permalink / raw)
To: Alessandro Zummo, Alexandre Belloni, linux-rtc, linux-kernel
Cc: Henning Schild, Johannes Hahn, Werner Zeh, Claudius Heine
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>
---
drivers/rtc/Kconfig | 20 ++---
drivers/rtc/rtc-rx6110.c | 165 +++++++++++++++++++++++++++++++++------
2 files changed, 153 insertions(+), 32 deletions(-)
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index f74c7aad126a..c7fb749c1c2f 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -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
diff --git a/drivers/rtc/rtc-rx6110.c b/drivers/rtc/rtc-rx6110.c
index 3a9eb7043f01..a7b671a21022 100644
--- a/drivers/rtc/rtc-rx6110.c
+++ b/drivers/rtc/rtc-rx6110.c
@@ -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,
+};
+
+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,
};
-module_spi_driver(rx6110_driver);
+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, ®map_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");
--
2.20.1
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