Re: [PATCH 3/9] rtc: pcf50633: Remove

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

Hello,

On 09/03/2025 19:36:06+0000, linux@treblig.org wrote:
> From: "Dr. David Alan Gilbert" <linux@treblig.org>
> 
> The pcf50633 was used as part of the OpenMoko devices but
> the support for its main chip was recently removed in:
> commit 61b7f8920b17 ("ARM: s3c: remove all s3c24xx support")
> 
> See https://lore.kernel.org/all/Z8z236h4B5A6Ki3D@gallifrey/
> 
> Remove it.
> 
> Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
> ---
>  drivers/mfd/pcf50633-core.c       |   2 -
>  drivers/rtc/Kconfig               |   7 -
>  drivers/rtc/Makefile              |   1 -
>  drivers/rtc/rtc-pcf50633.c        | 284 ------------------------------
>  include/linux/mfd/pcf50633/core.h |   1 -
>  5 files changed, 295 deletions(-)
>  delete mode 100644 drivers/rtc/rtc-pcf50633.c

If you would separate by subsystem, this would be easier to apply. I
don't think the mfd changes are necessary from a bisection point of
view.

> 
> diff --git a/drivers/mfd/pcf50633-core.c b/drivers/mfd/pcf50633-core.c
> index 08aa68ef2fbc..d991a77f6dd2 100644
> --- a/drivers/mfd/pcf50633-core.c
> +++ b/drivers/mfd/pcf50633-core.c
> @@ -208,7 +208,6 @@ static int pcf50633_probe(struct i2c_client *client)
>  
>  	/* Create sub devices */
>  	pcf50633_client_dev_register(pcf, "pcf50633-input", &pcf->input_pdev);
> -	pcf50633_client_dev_register(pcf, "pcf50633-rtc", &pcf->rtc_pdev);
>  	pcf50633_client_dev_register(pcf, "pcf50633-mbc", &pcf->mbc_pdev);
>  
>  
> @@ -259,7 +258,6 @@ static void pcf50633_remove(struct i2c_client *client)
>  	pcf50633_irq_free(pcf);
>  
>  	platform_device_unregister(pcf->input_pdev);
> -	platform_device_unregister(pcf->rtc_pdev);
>  	platform_device_unregister(pcf->mbc_pdev);
>  
>  	for (i = 0; i < PCF50633_NUM_REGULATORS; i++)
> diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
> index 0bbbf778ecfa..838bdc138ffe 100644
> --- a/drivers/rtc/Kconfig
> +++ b/drivers/rtc/Kconfig
> @@ -1321,13 +1321,6 @@ config RTC_DRV_SPEAR
>  	 If you say Y here you will get support for the RTC found on
>  	 spear
>  
> -config RTC_DRV_PCF50633
> -	depends on MFD_PCF50633
> -	tristate "NXP PCF50633 RTC"
> -	help
> -	  If you say yes here you get support for the RTC subsystem of the
> -	  NXP PCF50633 used in embedded systems.
> -
>  config RTC_DRV_AB8500
>  	tristate "ST-Ericsson AB8500 RTC"
>  	depends on AB8500_CORE
> diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
> index 489b4ab07068..31473b3276d9 100644
> --- a/drivers/rtc/Makefile
> +++ b/drivers/rtc/Makefile
> @@ -126,7 +126,6 @@ obj-$(CONFIG_RTC_DRV_PALMAS)	+= rtc-palmas.o
>  obj-$(CONFIG_RTC_DRV_PCAP)	+= rtc-pcap.o
>  obj-$(CONFIG_RTC_DRV_PCF2123)	+= rtc-pcf2123.o
>  obj-$(CONFIG_RTC_DRV_PCF2127)	+= rtc-pcf2127.o
> -obj-$(CONFIG_RTC_DRV_PCF50633)	+= rtc-pcf50633.o
>  obj-$(CONFIG_RTC_DRV_PCF85063)	+= rtc-pcf85063.o
>  obj-$(CONFIG_RTC_DRV_PCF8523)	+= rtc-pcf8523.o
>  obj-$(CONFIG_RTC_DRV_PCF85363)	+= rtc-pcf85363.o
> diff --git a/drivers/rtc/rtc-pcf50633.c b/drivers/rtc/rtc-pcf50633.c
> deleted file mode 100644
> index c019c4d91c7d..000000000000
> --- a/drivers/rtc/rtc-pcf50633.c
> +++ /dev/null
> @@ -1,284 +0,0 @@
> -// SPDX-License-Identifier: GPL-2.0-or-later
> -/* NXP PCF50633 RTC Driver
> - *
> - * (C) 2006-2008 by Openmoko, Inc.
> - * Author: Balaji Rao <balajirrao@openmoko.org>
> - * All rights reserved.
> - *
> - * Broken down from monstrous PCF50633 driver mainly by
> - * Harald Welte, Andy Green and Werner Almesberger
> - */
> -
> -#include <linux/kernel.h>
> -#include <linux/module.h>
> -#include <linux/init.h>
> -#include <linux/device.h>
> -#include <linux/slab.h>
> -#include <linux/platform_device.h>
> -#include <linux/rtc.h>
> -#include <linux/bcd.h>
> -#include <linux/err.h>
> -
> -#include <linux/mfd/pcf50633/core.h>
> -
> -#define PCF50633_REG_RTCSC	0x59 /* Second */
> -#define PCF50633_REG_RTCMN	0x5a /* Minute */
> -#define PCF50633_REG_RTCHR	0x5b /* Hour */
> -#define PCF50633_REG_RTCWD	0x5c /* Weekday */
> -#define PCF50633_REG_RTCDT	0x5d /* Day */
> -#define PCF50633_REG_RTCMT	0x5e /* Month */
> -#define PCF50633_REG_RTCYR	0x5f /* Year */
> -#define PCF50633_REG_RTCSCA	0x60 /* Alarm Second */
> -#define PCF50633_REG_RTCMNA	0x61 /* Alarm Minute */
> -#define PCF50633_REG_RTCHRA	0x62 /* Alarm Hour */
> -#define PCF50633_REG_RTCWDA	0x63 /* Alarm Weekday */
> -#define PCF50633_REG_RTCDTA	0x64 /* Alarm Day */
> -#define PCF50633_REG_RTCMTA	0x65 /* Alarm Month */
> -#define PCF50633_REG_RTCYRA	0x66 /* Alarm Year */
> -
> -enum pcf50633_time_indexes {
> -	PCF50633_TI_SEC,
> -	PCF50633_TI_MIN,
> -	PCF50633_TI_HOUR,
> -	PCF50633_TI_WKDAY,
> -	PCF50633_TI_DAY,
> -	PCF50633_TI_MONTH,
> -	PCF50633_TI_YEAR,
> -	PCF50633_TI_EXTENT /* always last */
> -};
> -
> -struct pcf50633_time {
> -	u_int8_t time[PCF50633_TI_EXTENT];
> -};
> -
> -struct pcf50633_rtc {
> -	int alarm_enabled;
> -	int alarm_pending;
> -
> -	struct pcf50633 *pcf;
> -	struct rtc_device *rtc_dev;
> -};
> -
> -static void pcf2rtc_time(struct rtc_time *rtc, struct pcf50633_time *pcf)
> -{
> -	rtc->tm_sec = bcd2bin(pcf->time[PCF50633_TI_SEC]);
> -	rtc->tm_min = bcd2bin(pcf->time[PCF50633_TI_MIN]);
> -	rtc->tm_hour = bcd2bin(pcf->time[PCF50633_TI_HOUR]);
> -	rtc->tm_wday = bcd2bin(pcf->time[PCF50633_TI_WKDAY]);
> -	rtc->tm_mday = bcd2bin(pcf->time[PCF50633_TI_DAY]);
> -	rtc->tm_mon = bcd2bin(pcf->time[PCF50633_TI_MONTH]) - 1;
> -	rtc->tm_year = bcd2bin(pcf->time[PCF50633_TI_YEAR]) + 100;
> -}
> -
> -static void rtc2pcf_time(struct pcf50633_time *pcf, struct rtc_time *rtc)
> -{
> -	pcf->time[PCF50633_TI_SEC] = bin2bcd(rtc->tm_sec);
> -	pcf->time[PCF50633_TI_MIN] = bin2bcd(rtc->tm_min);
> -	pcf->time[PCF50633_TI_HOUR] = bin2bcd(rtc->tm_hour);
> -	pcf->time[PCF50633_TI_WKDAY] = bin2bcd(rtc->tm_wday);
> -	pcf->time[PCF50633_TI_DAY] = bin2bcd(rtc->tm_mday);
> -	pcf->time[PCF50633_TI_MONTH] = bin2bcd(rtc->tm_mon + 1);
> -	pcf->time[PCF50633_TI_YEAR] = bin2bcd(rtc->tm_year % 100);
> -}
> -
> -static int
> -pcf50633_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
> -{
> -	struct pcf50633_rtc *rtc = dev_get_drvdata(dev);
> -	int err;
> -
> -	if (enabled)
> -		err = pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_ALARM);
> -	else
> -		err = pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_ALARM);
> -
> -	if (err < 0)
> -		return err;
> -
> -	rtc->alarm_enabled = enabled;
> -
> -	return 0;
> -}
> -
> -static int pcf50633_rtc_read_time(struct device *dev, struct rtc_time *tm)
> -{
> -	struct pcf50633_rtc *rtc;
> -	struct pcf50633_time pcf_tm;
> -	int ret;
> -
> -	rtc = dev_get_drvdata(dev);
> -
> -	ret = pcf50633_read_block(rtc->pcf, PCF50633_REG_RTCSC,
> -					    PCF50633_TI_EXTENT,
> -					    &pcf_tm.time[0]);
> -	if (ret != PCF50633_TI_EXTENT) {
> -		dev_err(dev, "Failed to read time\n");
> -		return -EIO;
> -	}
> -
> -	dev_dbg(dev, "PCF_TIME: %02x.%02x.%02x %02x:%02x:%02x\n",
> -		pcf_tm.time[PCF50633_TI_DAY],
> -		pcf_tm.time[PCF50633_TI_MONTH],
> -		pcf_tm.time[PCF50633_TI_YEAR],
> -		pcf_tm.time[PCF50633_TI_HOUR],
> -		pcf_tm.time[PCF50633_TI_MIN],
> -		pcf_tm.time[PCF50633_TI_SEC]);
> -
> -	pcf2rtc_time(tm, &pcf_tm);
> -
> -	dev_dbg(dev, "RTC_TIME: %ptRr\n", tm);
> -
> -	return 0;
> -}
> -
> -static int pcf50633_rtc_set_time(struct device *dev, struct rtc_time *tm)
> -{
> -	struct pcf50633_rtc *rtc;
> -	struct pcf50633_time pcf_tm;
> -	int alarm_masked, ret = 0;
> -
> -	rtc = dev_get_drvdata(dev);
> -
> -	dev_dbg(dev, "RTC_TIME: %ptRr\n", tm);
> -
> -	rtc2pcf_time(&pcf_tm, tm);
> -
> -	dev_dbg(dev, "PCF_TIME: %02x.%02x.%02x %02x:%02x:%02x\n",
> -		pcf_tm.time[PCF50633_TI_DAY],
> -		pcf_tm.time[PCF50633_TI_MONTH],
> -		pcf_tm.time[PCF50633_TI_YEAR],
> -		pcf_tm.time[PCF50633_TI_HOUR],
> -		pcf_tm.time[PCF50633_TI_MIN],
> -		pcf_tm.time[PCF50633_TI_SEC]);
> -
> -
> -	alarm_masked = pcf50633_irq_mask_get(rtc->pcf, PCF50633_IRQ_ALARM);
> -
> -	if (!alarm_masked)
> -		pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_ALARM);
> -
> -	/* Returns 0 on success */
> -	ret = pcf50633_write_block(rtc->pcf, PCF50633_REG_RTCSC,
> -					     PCF50633_TI_EXTENT,
> -					     &pcf_tm.time[0]);
> -
> -	if (!alarm_masked)
> -		pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_ALARM);
> -
> -	return ret;
> -}
> -
> -static int pcf50633_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
> -{
> -	struct pcf50633_rtc *rtc;
> -	struct pcf50633_time pcf_tm;
> -	int ret = 0;
> -
> -	rtc = dev_get_drvdata(dev);
> -
> -	alrm->enabled = rtc->alarm_enabled;
> -	alrm->pending = rtc->alarm_pending;
> -
> -	ret = pcf50633_read_block(rtc->pcf, PCF50633_REG_RTCSCA,
> -				PCF50633_TI_EXTENT, &pcf_tm.time[0]);
> -	if (ret != PCF50633_TI_EXTENT) {
> -		dev_err(dev, "Failed to read time\n");
> -		return -EIO;
> -	}
> -
> -	pcf2rtc_time(&alrm->time, &pcf_tm);
> -
> -	return rtc_valid_tm(&alrm->time);
> -}
> -
> -static int pcf50633_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
> -{
> -	struct pcf50633_rtc *rtc;
> -	struct pcf50633_time pcf_tm;
> -	int alarm_masked, ret = 0;
> -
> -	rtc = dev_get_drvdata(dev);
> -
> -	rtc2pcf_time(&pcf_tm, &alrm->time);
> -
> -	/* do like mktime does and ignore tm_wday */
> -	pcf_tm.time[PCF50633_TI_WKDAY] = 7;
> -
> -	alarm_masked = pcf50633_irq_mask_get(rtc->pcf, PCF50633_IRQ_ALARM);
> -
> -	/* disable alarm interrupt */
> -	if (!alarm_masked)
> -		pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_ALARM);
> -
> -	/* Returns 0 on success */
> -	ret = pcf50633_write_block(rtc->pcf, PCF50633_REG_RTCSCA,
> -				PCF50633_TI_EXTENT, &pcf_tm.time[0]);
> -	if (!alrm->enabled)
> -		rtc->alarm_pending = 0;
> -
> -	if (!alarm_masked || alrm->enabled)
> -		pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_ALARM);
> -	rtc->alarm_enabled = alrm->enabled;
> -
> -	return ret;
> -}
> -
> -static const struct rtc_class_ops pcf50633_rtc_ops = {
> -	.read_time		= pcf50633_rtc_read_time,
> -	.set_time		= pcf50633_rtc_set_time,
> -	.read_alarm		= pcf50633_rtc_read_alarm,
> -	.set_alarm		= pcf50633_rtc_set_alarm,
> -	.alarm_irq_enable	= pcf50633_rtc_alarm_irq_enable,
> -};
> -
> -static void pcf50633_rtc_irq(int irq, void *data)
> -{
> -	struct pcf50633_rtc *rtc = data;
> -
> -	rtc_update_irq(rtc->rtc_dev, 1, RTC_AF | RTC_IRQF);
> -	rtc->alarm_pending = 1;
> -}
> -
> -static int pcf50633_rtc_probe(struct platform_device *pdev)
> -{
> -	struct pcf50633_rtc *rtc;
> -
> -	rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);
> -	if (!rtc)
> -		return -ENOMEM;
> -
> -	rtc->pcf = dev_to_pcf50633(pdev->dev.parent);
> -	platform_set_drvdata(pdev, rtc);
> -	rtc->rtc_dev = devm_rtc_device_register(&pdev->dev, "pcf50633-rtc",
> -				&pcf50633_rtc_ops, THIS_MODULE);
> -
> -	if (IS_ERR(rtc->rtc_dev))
> -		return PTR_ERR(rtc->rtc_dev);
> -
> -	pcf50633_register_irq(rtc->pcf, PCF50633_IRQ_ALARM,
> -					pcf50633_rtc_irq, rtc);
> -	return 0;
> -}
> -
> -static void pcf50633_rtc_remove(struct platform_device *pdev)
> -{
> -	struct pcf50633_rtc *rtc;
> -
> -	rtc = platform_get_drvdata(pdev);
> -	pcf50633_free_irq(rtc->pcf, PCF50633_IRQ_ALARM);
> -}
> -
> -static struct platform_driver pcf50633_rtc_driver = {
> -	.driver = {
> -		.name = "pcf50633-rtc",
> -	},
> -	.probe = pcf50633_rtc_probe,
> -	.remove = pcf50633_rtc_remove,
> -};
> -
> -module_platform_driver(pcf50633_rtc_driver);
> -
> -MODULE_DESCRIPTION("PCF50633 RTC driver");
> -MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
> -MODULE_LICENSE("GPL");
> -
> diff --git a/include/linux/mfd/pcf50633/core.h b/include/linux/mfd/pcf50633/core.h
> index 42e0412fa98f..f5ab3e64c230 100644
> --- a/include/linux/mfd/pcf50633/core.h
> +++ b/include/linux/mfd/pcf50633/core.h
> @@ -146,7 +146,6 @@ struct pcf50633 {
>  
>  	int onkey1s_held;
>  
> -	struct platform_device *rtc_pdev;
>  	struct platform_device *mbc_pdev;
>  	struct platform_device *input_pdev;
>  	struct platform_device *regulator_pdev[PCF50633_NUM_REGULATORS];
> -- 
> 2.48.1
> 

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