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>

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");