rtc: rv3029: add nvram support

Export the 8 byte RAM using nvmem.

Link: https://lore.kernel.org/r/20191214221022.622482-17-alexandre.belloni@bootlin.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

diff --git a/drivers/rtc/rtc-rv3029c2.c b/drivers/rtc/rtc-rv3029c2.c
index 9c3a00a..fe74fa9 100644 (file)
--- a/drivers/rtc/rtc-rv3029c2.c
+++ b/drivers/rtc/rtc-rv3029c2.c
@@ -109,10 +109,8 @@
 #define RV3029_CONTROL_E2P_TOV_MASK    0x3F /* XTAL turnover temp mask */
 
 /* user ram section */
-#define RV3029_USR1_RAM_PAGE           0x38
-#define RV3029_USR1_SECTION_LEN                0x04
-#define RV3029_USR2_RAM_PAGE           0x3C
-#define RV3029_USR2_SECTION_LEN                0x04
+#define RV3029_RAM_PAGE                        0x38
+#define RV3029_RAM_SECTION_LEN         8
 
 struct rv3029_data {
        struct device           *dev;
@@ -481,6 +479,18 @@ static int rv3029_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
        }
 }
 
+static int rv3029_nvram_write(void *priv, unsigned int offset, void *val,
+                             size_t bytes)
+{
+       return regmap_bulk_write(priv, RV3029_RAM_PAGE + offset, val, bytes);
+}
+
+static int rv3029_nvram_read(void *priv, unsigned int offset, void *val,
+                            size_t bytes)
+{
+       return regmap_bulk_read(priv, RV3029_RAM_PAGE + offset, val, bytes);
+}
+
 static const struct rv3029_trickle_tab_elem {
        u32 r;          /* resistance in ohms */
        u8 conf;        /* trickle config bits */
@@ -701,6 +711,15 @@ static int rv3029_probe(struct device *dev, struct regmap *regmap, int irq,
                        const char *name)
 {
        struct rv3029_data *rv3029;
+       struct nvmem_config nvmem_cfg = {
+               .name = "rv3029_nvram",
+               .word_size = 1,
+               .stride = 1,
+               .size = RV3029_RAM_SECTION_LEN,
+               .type = NVMEM_TYPE_BATTERY_BACKED,
+               .reg_read = rv3029_nvram_read,
+               .reg_write = rv3029_nvram_write,
+       };
        int rc = 0;
 
        rv3029 = devm_kzalloc(dev, sizeof(*rv3029), GFP_KERNEL);
@@ -738,7 +757,14 @@ static int rv3029_probe(struct device *dev, struct regmap *regmap, int irq,
        rv3029->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
        rv3029->rtc->range_max = RTC_TIMESTAMP_END_2079;
 
-       return rtc_register_device(rv3029->rtc);
+       rc = rtc_register_device(rv3029->rtc);
+       if (rc)
+               return rc;
+
+       nvmem_cfg.priv = rv3029->regmap;
+       rtc_nvmem_register(rv3029->rtc, &nvmem_cfg);
+
+       return 0;
 }
 
 static const struct regmap_range rv3029_holes_range[] = {