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authorAlexandre Belloni <alexandre.belloni@bootlin.com>2019-12-14 23:10:22 +0100
committerAlexandre Belloni <alexandre.belloni@bootlin.com>2019-12-23 11:13:49 +0100
commitec923fcccf9b7d123f36f181b9088e1501b5a211 (patch)
tree8af35ff308b4ab90f778a5a38b87911061a3ab9b /drivers/rtc
parentcbc943eb37ca1ce2c1c05de54d9768bb7824a7aa (diff)
downloadlinux-ec923fcccf9b7d123f36f181b9088e1501b5a211.tar.bz2
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>
Diffstat (limited to 'drivers/rtc')
-rw-r--r--drivers/rtc/rtc-rv3029c2.c36
1 files changed, 31 insertions, 5 deletions
diff --git a/drivers/rtc/rtc-rv3029c2.c b/drivers/rtc/rtc-rv3029c2.c
index 9c3a00a3e41b..fe74fa91ee8c 100644
--- 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[] = {