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rtc: bd70528: Support RTC on ROHM BD71815

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BD71815 contains similar RTC block as BD71828. Only the address offsets
seem different. Support also BD71815 RTC using rtc-bd70528.

Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Matti Vaittinen 2021-04-05 14:44:50 +03:00 committed by Lee Jones
parent 42391f7e21
commit c56dc069f2
2 changed files with 40 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/rtc/Kconfig
View File

@ -501,11 +501,11 @@ config RTC_DRV_M41T80_WDT
watchdog timer in the ST M41T60 and M41T80 RTC chips series.
config RTC_DRV_BD70528
tristate "ROHM BD70528 PMIC RTC"
depends on MFD_ROHM_BD70528 && (BD70528_WATCHDOG || !BD70528_WATCHDOG)
tristate "ROHM BD70528, BD71815 and BD71828 PMIC RTC"
depends on MFD_ROHM_BD71828 || MFD_ROHM_BD70528 && (BD70528_WATCHDOG || !BD70528_WATCHDOG)
help
If you say Y here you will get support for the RTC
block on ROHM BD70528 and BD71828 Power Management IC.
block on ROHM BD70528, BD71815 and BD71828 Power Management IC.
This driver can also be built as a module. If so, the module
will be called rtc-bd70528.

45
drivers/rtc/rtc-bd70528.c
View File

@ -6,6 +6,7 @@
#include <linux/bcd.h>
#include <linux/mfd/rohm-bd70528.h>
#include <linux/mfd/rohm-bd71815.h>
#include <linux/mfd/rohm-bd71828.h>
#include <linux/module.h>
#include <linux/of.h>
@ -13,6 +14,12 @@
#include <linux/regmap.h>
#include <linux/rtc.h>
/*
* On BD71828 and BD71815 the ALM0 MASK is 14 bytes after the ALM0
* block start
*/
#define BD718XX_ALM_EN_OFFSET 14
/*
* We read regs RTC_SEC => RTC_YEAR
* this struct is ordered according to chip registers.
@ -55,6 +62,7 @@ struct bd70528_rtc {
struct regmap *regmap;
struct device *dev;
u8 reg_time_start;
u8 bd718xx_alm_block_start;
bool has_rtc_timers;
};
@ -236,8 +244,8 @@ static int bd71828_set_alarm(struct device *dev, struct rtc_wkalrm *a)
struct bd71828_rtc_alm alm;
struct bd70528_rtc *r = dev_get_drvdata(dev);
ret = regmap_bulk_read(r->regmap, BD71828_REG_RTC_ALM_START,
&alm, sizeof(alm));
ret = regmap_bulk_read(r->regmap, r->bd718xx_alm_block_start, &alm,
sizeof(alm));
if (ret) {
dev_err(dev, "Failed to read alarm regs\n");
return ret;
@ -250,8 +258,8 @@ static int bd71828_set_alarm(struct device *dev, struct rtc_wkalrm *a)
else
alm.alm_mask |= BD70528_MASK_ALM_EN;
ret = regmap_bulk_write(r->regmap, BD71828_REG_RTC_ALM_START,
&alm, sizeof(alm));
ret = regmap_bulk_write(r->regmap, r->bd718xx_alm_block_start, &alm,
sizeof(alm));
if (ret)
dev_err(dev, "Failed to set alarm time\n");
@ -311,8 +319,8 @@ static int bd71828_read_alarm(struct device *dev, struct rtc_wkalrm *a)
struct bd71828_rtc_alm alm;
struct bd70528_rtc *r = dev_get_drvdata(dev);
ret = regmap_bulk_read(r->regmap, BD71828_REG_RTC_ALM_START,
&alm, sizeof(alm));
ret = regmap_bulk_read(r->regmap, r->bd718xx_alm_block_start, &alm,
sizeof(alm));
if (ret) {
dev_err(dev, "Failed to read alarm regs\n");
return ret;
@ -453,8 +461,9 @@ static int bd71828_alm_enable(struct device *dev, unsigned int enabled)
if (!enabled)
enableval = 0;
ret = regmap_update_bits(r->regmap, BD71828_REG_RTC_ALM0_MASK,
BD70528_MASK_ALM_EN, enableval);
ret = regmap_update_bits(r->regmap, r->bd718xx_alm_block_start +
BD718XX_ALM_EN_OFFSET, BD70528_MASK_ALM_EN,
enableval);
if (ret)
dev_err(dev, "Failed to change alarm state\n");
@ -524,9 +533,28 @@ static int bd70528_probe(struct platform_device *pdev)
enable_main_irq = true;
rtc_ops = &bd70528_rtc_ops;
break;
case ROHM_CHIP_TYPE_BD71815:
irq_name = "bd71815-rtc-alm-0";
bd_rtc->reg_time_start = BD71815_REG_RTC_START;
/*
* See also BD718XX_ALM_EN_OFFSET:
* This works for BD71828 and BD71815 as they have same offset
* between ALM0 start and ALM0_MASK. If new ICs are to be
* added this requires proper check as ALM0_MASK is not located
* at the end of ALM0 block - but after all ALM blocks so if
* amount of ALMs differ the offset to enable/disable is likely
* to be incorrect and enable/disable must be given as own
* reg address here.
*/
bd_rtc->bd718xx_alm_block_start = BD71815_REG_RTC_ALM_START;
hour_reg = BD71815_REG_HOUR;
rtc_ops = &bd71828_rtc_ops;
break;
case ROHM_CHIP_TYPE_BD71828:
irq_name = "bd71828-rtc-alm-0";
bd_rtc->reg_time_start = BD71828_REG_RTC_START;
bd_rtc->bd718xx_alm_block_start = BD71828_REG_RTC_ALM_START;
hour_reg = BD71828_REG_RTC_HOUR;
rtc_ops = &bd71828_rtc_ops;
break;
@ -605,6 +633,7 @@ static int bd70528_probe(struct platform_device *pdev)
static const struct platform_device_id bd718x7_rtc_id[] = {
{ "bd70528-rtc", ROHM_CHIP_TYPE_BD70528 },
{ "bd71828-rtc", ROHM_CHIP_TYPE_BD71828 },
{ "bd71815-rtc", ROHM_CHIP_TYPE_BD71815 },
{ },
};
MODULE_DEVICE_TABLE(platform, bd718x7_rtc_id);