rtc: rv3029: Add support of RV3049

Add support of Microcrystal RV3049 RTC (SPI) using regmap on the
RV3029 (I2C) driver.

Signed-off-by: Mylène Josserand <mylene.josserand@free-electrons.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

2 files changed, 124 insertions, 21 deletions

diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index f1e1f502be5d..18639e0cb6e2 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -573,24 +573,6 @@ config RTC_DRV_EM3027
           This driver can also be built as a module. If so, the module
           will be called rtc-em3027.
 
-config RTC_DRV_RV3029C2
-        tristate "Micro Crystal RV3029"
-        help
-          If you say yes here you get support for the Micro Crystal
-          RV3029 RTC chips.
-
-          This driver can also be built as a module. If so, the module
-          will be called rtc-rv3029c2.
-
-config RTC_DRV_RV3029_HWMON
-        bool "HWMON support for RV3029"
-        depends on RTC_DRV_RV3029C2 && HWMON
-        depends on !(RTC_DRV_RV3029C2=y && HWMON=m)
-        default y
-        help
-          Say Y here if you want to expose temperature sensor data on
-          rtc-rv3029.
-
 config RTC_DRV_RV8803
         tristate "Micro Crystal RV8803"
         help
@@ -786,6 +768,25 @@ config RTC_DRV_PCF2127
           This driver can also be built as a module. If so, the module
           will be called rtc-pcf2127.
 
+config RTC_DRV_RV3029C2
+        tristate "Micro Crystal RV3029/3049"
+        depends on RTC_I2C_AND_SPI
+        help
+          If you say yes here you get support for the Micro Crystal
+          RV3029 and RV3049 RTC chips.
+
+          This driver can also be built as a module. If so, the module
+          will be called rtc-rv3029c2.
+
+config RTC_DRV_RV3029_HWMON
+        bool "HWMON support for RV3029/3049"
+        depends on RTC_DRV_RV3029C2 && HWMON
+        depends on !(RTC_DRV_RV3029C2=y && HWMON=m)
+        default y
+        help
+          Say Y here if you want to expose temperature sensor data on
+          rtc-rv3029.
+
 comment "Platform RTC drivers"
 
 # this 'CMOS' RTC driver is arch dependent because <asm-generic/rtc.h>
diff --git a/drivers/rtc/rtc-rv3029c2.c b/drivers/rtc/rtc-rv3029c2.c
index 96dd1665220c..1310646a4821 100644
--- a/drivers/rtc/rtc-rv3029c2.c
+++ b/drivers/rtc/rtc-rv3029c2.c
@@ -1,5 +1,5 @@
 /*
- * Micro Crystal RV-3029 rtc class driver
+ * Micro Crystal RV-3029 / RV-3049 rtc class driver
  *
  * Author: Gregory Hermant <gregory.hermant@calao-systems.com>
  *         Michael Buesch <m@bues.ch>
@@ -14,6 +14,7 @@
 
 #include <linux/module.h>
 #include <linux/i2c.h>
+#include <linux/spi/spi.h>
 #include <linux/bcd.h>
 #include <linux/rtc.h>
 #include <linux/delay.h>
@@ -766,6 +767,8 @@ static int rv3029_probe(struct device *dev, struct regmap *regmap, int irq,
         return PTR_ERR_OR_ZERO(rv3029->rtc);
 }
 
+#if IS_ENABLED(CONFIG_I2C)
+
 static int rv3029_i2c_probe(struct i2c_client *client,
                             const struct i2c_device_id *id)
 {
@@ -799,9 +802,108 @@ static struct i2c_driver rv3029_driver = {
         .id_table       = rv3029_id,
 };
 
-module_i2c_driver(rv3029_driver);
+static int rv3029_register_driver(void)
+{
+        return i2c_add_driver(&rv3029_driver);
+}
+
+static void rv3029_unregister_driver(void)
+{
+        i2c_del_driver(&rv3029_driver);
+}
+
+#else
+
+static int rv3029_register_driver(void)
+{
+        return 0;
+}
+
+static void rv3029_unregister_driver(void)
+{
+}
+
+#endif
+
+#if IS_ENABLED(CONFIG_SPI_MASTER)
+
+static int rv3049_probe(struct spi_device *spi)
+{
+        static const struct regmap_config config = {
+                .reg_bits = 8,
+                .val_bits = 8,
+        };
+        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 rv3029_probe(&spi->dev, regmap, spi->irq, "rv3049");
+}
+
+static struct spi_driver rv3049_driver = {
+        .driver = {
+                .name    = "rv3049",
+        },
+        .probe   = rv3049_probe,
+};
+
+static int rv3049_register_driver(void)
+{
+        return spi_register_driver(&rv3049_driver);
+}
+
+static void rv3049_unregister_driver(void)
+{
+        spi_unregister_driver(&rv3049_driver);
+}
+
+#else
+
+static int rv3049_register_driver(void)
+{
+        return 0;
+}
+
+static void rv3049_unregister_driver(void)
+{
+}
+
+#endif
+
+static int __init rv30x9_init(void)
+{
+        int ret;
+
+        ret = rv3029_register_driver();
+        if (ret) {
+                pr_err("Failed to register rv3029 driver: %d\n", ret);
+                return ret;
+        }
+
+        ret = rv3049_register_driver();
+        if (ret) {
+                pr_err("Failed to register rv3049 driver: %d\n", ret);
+                rv3029_unregister_driver();
+        }
+
+        return ret;
+}
+module_init(rv30x9_init)
+
+static void __exit rv30x9_exit(void)
+{
+        rv3049_unregister_driver();
+        rv3029_unregister_driver();
+}
+module_exit(rv30x9_exit)
 
 MODULE_AUTHOR("Gregory Hermant <gregory.hermant@calao-systems.com>");
 MODULE_AUTHOR("Michael Buesch <m@bues.ch>");
-MODULE_DESCRIPTION("Micro Crystal RV3029 RTC driver");
+MODULE_DESCRIPTION("Micro Crystal RV3029/RV3049 RTC driver");
 MODULE_LICENSE("GPL");
+MODULE_ALIAS("spi:rv3049");