Re: [PATCH 4/8] rtc: bd70528: Support RTC on ROHM BD73800

[Alexandre Belloni <alexandre.belloni@bootlin.com>]

On 01/07/2026 15:42:20+0300, Matti Vaittinen wrote:
> From: Matti Vaittinen <mazziesaccount@gmail.com>
> 
> BD73800 contains similar RTC block as BD71828 and BD71815. Only the address
> offsets seem different. Support also BD73800 RTC using the rtc-bd70528.
> 
> Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com>
Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

> ---
>  drivers/rtc/rtc-bd70528.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/drivers/rtc/rtc-bd70528.c b/drivers/rtc/rtc-bd70528.c
> index 482810b61495..fd415e327ea6 100644
> --- a/drivers/rtc/rtc-bd70528.c
> +++ b/drivers/rtc/rtc-bd70528.c
> @@ -8,6 +8,7 @@
>  #include <linux/mfd/rohm-bd71815.h>
>  #include <linux/mfd/rohm-bd71828.h>
>  #include <linux/mfd/rohm-bd72720.h>
> +#include <linux/mfd/rohm-bd73800.h>
>  #include <linux/module.h>
>  #include <linux/of.h>
>  #include <linux/platform_device.h>
> @@ -284,6 +285,12 @@ static int bd70528_probe(struct platform_device *pdev)
>  		bd_rtc->bd718xx_alm_block_start = BD72720_REG_RTC_ALM_START;
>  		hour_reg = BD72720_REG_RTC_HOUR;
>  		break;
> +	case ROHM_CHIP_TYPE_BD73800:
> +		bd_rtc->reg_time_start = BD73800_REG_RTC_START;
> +		bd_rtc->bd718xx_alm_block_start = BD73800_REG_RTC_ALM_START;
> +		hour_reg = BD73800_REG_RTC_HOUR;
> +		break;
> +
>  	default:
>  		dev_err(&pdev->dev, "Unknown chip\n");
>  		return -ENOENT;
> @@ -344,6 +351,7 @@ static const struct platform_device_id bd718x7_rtc_id[] = {
>  	{ .name = "bd71828-rtc", .driver_data = ROHM_CHIP_TYPE_BD71828 },
>  	{ .name = "bd71815-rtc", .driver_data = ROHM_CHIP_TYPE_BD71815 },
>  	{ .name = "bd72720-rtc", .driver_data = ROHM_CHIP_TYPE_BD72720 },
> +	{ .name = "bd73800-rtc", .driver_data = ROHM_CHIP_TYPE_BD73800 },
>  	{ }
>  };
>  MODULE_DEVICE_TABLE(platform, bd718x7_rtc_id);
> -- 
> 2.54.0
> 



-- 
Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com