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authorAkinobu Mita <akinobu.mita@gmail.com>2016-03-14 23:45:00 +0900
committerAlexandre Belloni <alexandre.belloni@free-electrons.com>2016-03-14 17:08:41 +0100
commit9408ec1af875a83ad75f3dac1aa18d2337a809fe (patch)
tree42fae0b42985bf19de9921915984f5a7e873789e /drivers
parent907b3262583c700ef48f6a45b2b48878b524b2ef (diff)
downloadlinux-9408ec1af875a83ad75f3dac1aa18d2337a809fe.tar.bz2
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: Akinobu Mita <akinobu.mita@gmail.com> Cc: Alessandro Zummo <a.zummo@towertech.it> Cc: Alexandre Belloni <alexandre.belloni@free-electrons.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/rtc/Kconfig19
-rw-r--r--drivers/rtc/rtc-pcf2127.c118
2 files changed, 126 insertions, 11 deletions
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index d2cd206d2965..544bd3493852 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -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>
diff --git a/drivers/rtc/rtc-pcf2127.c b/drivers/rtc/rtc-pcf2127.c
index fa492cd84e2a..194c440f15d3 100644
--- a/drivers/rtc/rtc-pcf2127.c
+++ b/drivers/rtc/rtc-pcf2127.c
@@ -1,5 +1,5 @@
/*
- * 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");