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rtc: rv3029: add nvram support

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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>
This commit is contained in:
Alexandre Belloni 2019-12-14 23:10:22 +01:00
parent cbc943eb37
commit ec923fcccf
1 changed files with 31 additions and 5 deletions
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36
drivers/rtc/rtc-rv3029c2.c
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@ -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[] = {