Commit ec923fcc authored by Alexandre Belloni's avatar Alexandre Belloni
Browse files

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: default avatarAlexandre Belloni <alexandre.belloni@bootlin.com>
parent cbc943eb

drivers/rtc/rtc-rv3029c2.c

+31 −5
Original line number Diff line number Diff line
@@ -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[] = {