[PATCH RESEND v6 14/17] rtc: bd70528: Support BD72720 rtc

Matti Vaittinen
2025-12-15T13:21:09Z

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From: Matti Vaittinen <mazziesaccount@gmail.com>

The BD72720 has similar RTC block as a few other ROHM PMICs.

Add support for BD72720 RTC.

Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com>
Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

---
Revision history:
RFCv1 =>:
- No changes
---
drivers/rtc/Kconfig | 3 ++-
drivers/rtc/rtc-bd70528.c | 21 ++++++++++++++-------
2 files changed, 16 insertions(+), 8 deletions(-)

diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 50dc779f7f98..7ac18985e438 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -570,7 +570,8 @@ config RTC_DRV_BD70528
depends on MFD_ROHM_BD71828
help
If you say Y here you will get support for the RTC
- block on ROHM BD71815 and BD71828 Power Management IC.
+ block on ROHM BD71815, BD71828 and BD72720 Power
+ Management ICs.

This driver can also be built as a module. If so, the module
will be called rtc-bd70528.
diff --git a/drivers/rtc/rtc-bd70528.c b/drivers/rtc/rtc-bd70528.c
index 954ac4ef53e8..4c8599761b2e 100644
--- a/drivers/rtc/rtc-bd70528.c
+++ b/drivers/rtc/rtc-bd70528.c
@@ -7,6 +7,7 @@
#include <linux/bcd.h>
#include <linux/mfd/rohm-bd71815.h>
#include <linux/mfd/rohm-bd71828.h>
+#include <linux/mfd/rohm-bd72720.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
@@ -262,13 +263,13 @@ static int bd70528_probe(struct platform_device *pdev)

/*
* 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.
+ * This works for BD71828, BD71815, and BD72720 as they all
+ * have same offset between the ALM0 start and the ALM0_MASK.
+ * If new ICs are to be added this requires proper check as
+ * the ALM0_MASK is not located at the end of ALM0 block -
+ * but after all ALM blocks. 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;
@@ -278,6 +279,11 @@ static int bd70528_probe(struct platform_device *pdev)
bd_rtc->bd718xx_alm_block_start = BD71828_REG_RTC_ALM_START;
hour_reg = BD71828_REG_RTC_HOUR;
break;
+ case ROHM_CHIP_TYPE_BD72720:
+ bd_rtc->reg_time_start = BD72720_REG_RTC_START;
+ bd_rtc->bd718xx_alm_block_start = BD72720_REG_RTC_ALM_START;
+ hour_reg = BD72720_REG_RTC_HOUR;
+ break;
default:
dev_err(&pdev->dev, "Unknown chip\n");
return -ENOENT;
@@ -337,6 +343,7 @@ static int bd70528_probe(struct platform_device *pdev)
static const struct platform_device_id bd718x7_rtc_id[] = {
{ "bd71828-rtc", ROHM_CHIP_TYPE_BD71828 },
{ "bd71815-rtc", ROHM_CHIP_TYPE_BD71815 },
+ { "bd72720-rtc", ROHM_CHIP_TYPE_BD72720 },
{ },
};
MODULE_DEVICE_TABLE(platform, bd718x7_rtc_id);