1 files changed, 38 insertions, 2 deletions

diff --git a/drivers/rtc/rtc-ds3232.c b/drivers/rtc/rtc-ds3232.c
index 7184e5145f12..1e9312f96021 100644
--- a/drivers/rtc/rtc-ds3232.c
+++ b/drivers/rtc/rtc-ds3232.c
@@ -48,6 +48,10 @@
 #       define DS3232_REG_SR_A1F     0x01
 
 #define DS3232_REG_TEMPERATURE  0x11
+#define DS3232_REG_SRAM_START   0x14
+#define DS3232_REG_SRAM_END     0xFF
+
+#define DS3232_REG_SRAM_SIZE    236
 
 struct ds3232 {
         struct device *dev;
@@ -461,11 +465,39 @@ static const struct rtc_class_ops ds3232_rtc_ops = {
         .alarm_irq_enable = ds3232_alarm_irq_enable,
 };
 
+static int ds3232_nvmem_read(void *priv, unsigned int offset, void *val,
+                             size_t bytes)
+{
+        struct regmap *ds3232_regmap = (struct regmap *)priv;
+
+        return regmap_bulk_read(ds3232_regmap, DS3232_REG_SRAM_START + offset,
+                                val, bytes);
+}
+
+static int ds3232_nvmem_write(void *priv, unsigned int offset, void *val,
+                              size_t bytes)
+{
+        struct regmap *ds3232_regmap = (struct regmap *)priv;
+
+        return regmap_bulk_write(ds3232_regmap, DS3232_REG_SRAM_START + offset,
+                                 val, bytes);
+}
+
 static int ds3232_probe(struct device *dev, struct regmap *regmap, int irq,
                         const char *name)
 {
         struct ds3232 *ds3232;
         int ret;
+        struct nvmem_config nvmem_cfg = {
+                .name = "ds3232_sram",
+                .stride = 1,
+                .size = DS3232_REG_SRAM_SIZE,
+                .word_size = 1,
+                .reg_read = ds3232_nvmem_read,
+                .reg_write = ds3232_nvmem_write,
+                .priv = regmap,
+                .type = NVMEM_TYPE_BATTERY_BACKED
+        };
 
         ds3232 = devm_kzalloc(dev, sizeof(*ds3232), GFP_KERNEL);
         if (!ds3232)
@@ -490,6 +522,10 @@ static int ds3232_probe(struct device *dev, struct regmap *regmap, int irq,
         if (IS_ERR(ds3232->rtc))
                 return PTR_ERR(ds3232->rtc);
 
+        ret = rtc_nvmem_register(ds3232->rtc, &nvmem_cfg);
+        if(ret)
+                return ret;
+
         if (ds3232->irq > 0) {
                 ret = devm_request_threaded_irq(dev, ds3232->irq, NULL,
                                                 ds3232_irq,
@@ -542,7 +578,7 @@ static int ds3232_i2c_probe(struct i2c_client *client,
         static const struct regmap_config config = {
                 .reg_bits = 8,
                 .val_bits = 8,
-                .max_register = 0x13,
+                .max_register = DS3232_REG_SRAM_END,
         };
 
         regmap = devm_regmap_init_i2c(client, &config);
@@ -609,7 +645,7 @@ static int ds3234_probe(struct spi_device *spi)
         static const struct regmap_config config = {
                 .reg_bits = 8,
                 .val_bits = 8,
-                .max_register = 0x13,
+                .max_register = DS3232_REG_SRAM_END,
                 .write_flag_mask = 0x80,
         };
         struct regmap *regmap;