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rtc: bd70528: Drop BD70528 support

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The only known BD70528 use-cases are such that the PMIC is controlled
from separate MCU which is not running Linux. I am not aware of
any Linux driver users. Furthermore, it seems there is no demand for
this IC. Let's ease the maintenance burden and drop the driver. We can
always add it back if there is sudden need for it.

Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20210527105819.GA3111334@localhost.localdomain
This commit is contained in:
Matti Vaittinen 2021-05-27 13:58:19 +03:00 committed by Alexandre Belloni
parent 742b0d7e15
commit e5e3352580
2 changed files with 14 additions and 309 deletions
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7
drivers/rtc/Kconfig
View File

@ -501,12 +501,11 @@ config RTC_DRV_M41T80_WDT
watchdog timer in the ST M41T60 and M41T80 RTC chips series. watchdog timer in the ST M41T60 and M41T80 RTC chips series.
config RTC_DRV_BD70528 config RTC_DRV_BD70528
tristate "ROHM BD70528, BD71815 and BD71828 PMIC RTC" tristate "ROHM BD71815 and BD71828 PMIC RTC"
depends on MFD_ROHM_BD71828 || MFD_ROHM_BD70528 depends on MFD_ROHM_BD71828
depends on BD70528_WATCHDOG || !BD70528_WATCHDOG
help help
If you say Y here you will get support for the RTC If you say Y here you will get support for the RTC
block on ROHM BD70528, BD71815 and BD71828 Power Management IC. block on ROHM BD71815 and BD71828 Power Management IC.
This driver can also be built as a module. If so, the module This driver can also be built as a module. If so, the module
will be called rtc-bd70528. will be called rtc-bd70528.

316
drivers/rtc/rtc-bd70528.c
View File

@ -2,10 +2,9 @@
// //
// Copyright (C) 2018 ROHM Semiconductors // Copyright (C) 2018 ROHM Semiconductors
// //
// RTC driver for ROHM BD70528 PMIC // RTC driver for ROHM BD71828 and BD71815 PMIC
#include <linux/bcd.h> #include <linux/bcd.h>
#include <linux/mfd/rohm-bd70528.h>
#include <linux/mfd/rohm-bd71815.h> #include <linux/mfd/rohm-bd71815.h>
#include <linux/mfd/rohm-bd71828.h> #include <linux/mfd/rohm-bd71828.h>
#include <linux/module.h> #include <linux/module.h>
@ -39,11 +38,6 @@ struct bd70528_rtc_data {
u8 year; u8 year;
} __packed; } __packed;
struct bd70528_rtc_wake {
struct bd70528_rtc_day time;
u8 ctrl;
} __packed;
struct bd71828_rtc_alm { struct bd71828_rtc_alm {
struct bd70528_rtc_data alm0; struct bd70528_rtc_data alm0;
struct bd70528_rtc_data alm1; struct bd70528_rtc_data alm1;
@ -51,141 +45,14 @@ struct bd71828_rtc_alm {
u8 alm1_mask; u8 alm1_mask;
} __packed; } __packed;
struct bd70528_rtc_alm {
struct bd70528_rtc_data data;
u8 alm_mask;
u8 alm_repeat;
} __packed;
struct bd70528_rtc { struct bd70528_rtc {
struct rohm_regmap_dev *parent; struct rohm_regmap_dev *parent;
struct regmap *regmap; struct regmap *regmap;
struct device *dev; struct device *dev;
u8 reg_time_start; u8 reg_time_start;
u8 bd718xx_alm_block_start; u8 bd718xx_alm_block_start;
bool has_rtc_timers;
}; };
static int bd70528_set_wake(struct rohm_regmap_dev *bd70528,
int enable, int *old_state)
{
int ret;
unsigned int ctrl_reg;
ret = regmap_read(bd70528->regmap, BD70528_REG_WAKE_EN, &ctrl_reg);
if (ret)
return ret;
if (old_state) {
if (ctrl_reg & BD70528_MASK_WAKE_EN)
*old_state |= BD70528_WAKE_STATE_BIT;
else
*old_state &= ~BD70528_WAKE_STATE_BIT;
if (!enable == !(*old_state & BD70528_WAKE_STATE_BIT))
return 0;
}
if (enable)
ctrl_reg |= BD70528_MASK_WAKE_EN;
else
ctrl_reg &= ~BD70528_MASK_WAKE_EN;
return regmap_write(bd70528->regmap, BD70528_REG_WAKE_EN,
ctrl_reg);
}
static int bd70528_set_elapsed_tmr(struct rohm_regmap_dev *bd70528,
int enable, int *old_state)
{
int ret;
unsigned int ctrl_reg;
/*
* TBD
* What is the purpose of elapsed timer ?
* Is the timeout registers counting down, or is the disable - re-enable
* going to restart the elapsed-time counting? If counting is restarted
* the timeout should be decreased by the amount of time that has
* elapsed since starting the timer. Maybe we should store the monotonic
* clock value when timer is started so that if RTC is set while timer
* is armed we could do the compensation. This is a hack if RTC/system
* clk are drifting. OTOH, RTC controlled via I2C is in any case
* inaccurate...
*/
ret = regmap_read(bd70528->regmap, BD70528_REG_ELAPSED_TIMER_EN,
&ctrl_reg);
if (ret)
return ret;
if (old_state) {
if (ctrl_reg & BD70528_MASK_ELAPSED_TIMER_EN)
*old_state |= BD70528_ELAPSED_STATE_BIT;
else
*old_state &= ~BD70528_ELAPSED_STATE_BIT;
if ((!enable) == (!(*old_state & BD70528_ELAPSED_STATE_BIT)))
return 0;
}
if (enable)
ctrl_reg |= BD70528_MASK_ELAPSED_TIMER_EN;
else
ctrl_reg &= ~BD70528_MASK_ELAPSED_TIMER_EN;
return regmap_write(bd70528->regmap, BD70528_REG_ELAPSED_TIMER_EN,
ctrl_reg);
}
static int bd70528_set_rtc_based_timers(struct bd70528_rtc *r, int new_state,
int *old_state)
{
int ret;
ret = bd70528_wdt_set(r->parent, new_state & BD70528_WDT_STATE_BIT,
old_state);
if (ret) {
dev_err(r->dev,
"Failed to disable WDG for RTC setting (%d)\n", ret);
return ret;
}
ret = bd70528_set_elapsed_tmr(r->parent,
new_state & BD70528_ELAPSED_STATE_BIT,
old_state);
if (ret) {
dev_err(r->dev,
"Failed to disable 'elapsed timer' for RTC setting\n");
return ret;
}
ret = bd70528_set_wake(r->parent, new_state & BD70528_WAKE_STATE_BIT,
old_state);
if (ret) {
dev_err(r->dev,
"Failed to disable 'wake timer' for RTC setting\n");
return ret;
}
return ret;
}
static int bd70528_re_enable_rtc_based_timers(struct bd70528_rtc *r,
int old_state)
{
if (!r->has_rtc_timers)
return 0;
return bd70528_set_rtc_based_timers(r, old_state, NULL);
}
static int bd70528_disable_rtc_based_timers(struct bd70528_rtc *r,
int *old_state)
{
if (!r->has_rtc_timers)
return 0;
return bd70528_set_rtc_based_timers(r, 0, old_state);
}
static inline void tmday2rtc(struct rtc_time *t, struct bd70528_rtc_day *d) static inline void tmday2rtc(struct rtc_time *t, struct bd70528_rtc_day *d)
{ {
d->sec &= ~BD70528_MASK_RTC_SEC; d->sec &= ~BD70528_MASK_RTC_SEC;
@ -267,52 +134,6 @@ static int bd71828_set_alarm(struct device *dev, struct rtc_wkalrm *a)
} }
static int bd70528_set_alarm(struct device *dev, struct rtc_wkalrm *a)
{
struct bd70528_rtc_wake wake;
struct bd70528_rtc_alm alm;
int ret;
struct bd70528_rtc *r = dev_get_drvdata(dev);
ret = regmap_bulk_read(r->regmap, BD70528_REG_RTC_WAKE_START, &wake,
sizeof(wake));
if (ret) {
dev_err(dev, "Failed to read wake regs\n");
return ret;
}
ret = regmap_bulk_read(r->regmap, BD70528_REG_RTC_ALM_START, &alm,
sizeof(alm));
if (ret) {
dev_err(dev, "Failed to read alarm regs\n");
return ret;
}
tm2rtc(&a->time, &alm.data);
tmday2rtc(&a->time, &wake.time);
if (a->enabled) {
alm.alm_mask &= ~BD70528_MASK_ALM_EN;
wake.ctrl |= BD70528_MASK_WAKE_EN;
} else {
alm.alm_mask |= BD70528_MASK_ALM_EN;
wake.ctrl &= ~BD70528_MASK_WAKE_EN;
}
ret = regmap_bulk_write(r->regmap, BD70528_REG_RTC_WAKE_START, &wake,
sizeof(wake));
if (ret) {
dev_err(dev, "Failed to set wake time\n");
return ret;
}
ret = regmap_bulk_write(r->regmap, BD70528_REG_RTC_ALM_START, &alm,
sizeof(alm));
if (ret)
dev_err(dev, "Failed to set alarm time\n");
return ret;
}
static int bd71828_read_alarm(struct device *dev, struct rtc_wkalrm *a) static int bd71828_read_alarm(struct device *dev, struct rtc_wkalrm *a)
{ {
int ret; int ret;
@ -336,75 +157,25 @@ static int bd71828_read_alarm(struct device *dev, struct rtc_wkalrm *a)
return 0; return 0;
} }
static int bd70528_read_alarm(struct device *dev, struct rtc_wkalrm *a) static int bd71828_set_time(struct device *dev, struct rtc_time *t)
{ {
struct bd70528_rtc_alm alm;
int ret; int ret;
struct bd70528_rtc *r = dev_get_drvdata(dev);
ret = regmap_bulk_read(r->regmap, BD70528_REG_RTC_ALM_START, &alm,
sizeof(alm));
if (ret) {
dev_err(dev, "Failed to read alarm regs\n");
return ret;
}
rtc2tm(&alm.data, &a->time);
a->time.tm_mday = -1;
a->time.tm_mon = -1;
a->time.tm_year = -1;
a->enabled = !(alm.alm_mask & BD70528_MASK_ALM_EN);
a->pending = 0;
return 0;
}
static int bd70528_set_time_locked(struct device *dev, struct rtc_time *t)
{
int ret, tmpret, old_states;
struct bd70528_rtc_data rtc_data; struct bd70528_rtc_data rtc_data;
struct bd70528_rtc *r = dev_get_drvdata(dev); struct bd70528_rtc *r = dev_get_drvdata(dev);
ret = bd70528_disable_rtc_based_timers(r, &old_states); ret = regmap_bulk_read(r->regmap, r->reg_time_start, &rtc_data,
if (ret) sizeof(rtc_data));
return ret; if (ret) {
tmpret = regmap_bulk_read(r->regmap, r->reg_time_start, &rtc_data,
sizeof(rtc_data));
if (tmpret) {
dev_err(dev, "Failed to read RTC time registers\n"); dev_err(dev, "Failed to read RTC time registers\n");
goto renable_out; return ret;
} }
tm2rtc(t, &rtc_data); tm2rtc(t, &rtc_data);
tmpret = regmap_bulk_write(r->regmap, r->reg_time_start, &rtc_data, ret = regmap_bulk_write(r->regmap, r->reg_time_start, &rtc_data,
sizeof(rtc_data)); sizeof(rtc_data));
if (tmpret) { if (ret)
dev_err(dev, "Failed to set RTC time\n"); dev_err(dev, "Failed to set RTC time\n");
goto renable_out;
}
renable_out:
ret = bd70528_re_enable_rtc_based_timers(r, old_states);
if (tmpret)
ret = tmpret;
return ret;
}
static int bd71828_set_time(struct device *dev, struct rtc_time *t)
{
return bd70528_set_time_locked(dev, t);
}
static int bd70528_set_time(struct device *dev, struct rtc_time *t)
{
int ret;
struct bd70528_rtc *r = dev_get_drvdata(dev);
bd70528_wdt_lock(r->parent);
ret = bd70528_set_time_locked(dev, t);
bd70528_wdt_unlock(r->parent);
return ret; return ret;
} }
@ -427,31 +198,6 @@ static int bd70528_get_time(struct device *dev, struct rtc_time *t)
return 0; return 0;
} }
static int bd70528_alm_enable(struct device *dev, unsigned int enabled)
{
int ret;
unsigned int enableval = BD70528_MASK_ALM_EN;
struct bd70528_rtc *r = dev_get_drvdata(dev);
if (enabled)
enableval = 0;
bd70528_wdt_lock(r->parent);
ret = bd70528_set_wake(r->parent, enabled, NULL);
if (ret) {
dev_err(dev, "Failed to change wake state\n");
goto out_unlock;
}
ret = regmap_update_bits(r->regmap, BD70528_REG_RTC_ALM_MASK,
BD70528_MASK_ALM_EN, enableval);
if (ret)
dev_err(dev, "Failed to change alarm state\n");
out_unlock:
bd70528_wdt_unlock(r->parent);
return ret;
}
static int bd71828_alm_enable(struct device *dev, unsigned int enabled) static int bd71828_alm_enable(struct device *dev, unsigned int enabled)
{ {
int ret; int ret;
@ -470,14 +216,6 @@ static int bd71828_alm_enable(struct device *dev, unsigned int enabled)
return ret; return ret;
} }
static const struct rtc_class_ops bd70528_rtc_ops = {
.read_time = bd70528_get_time,
.set_time = bd70528_set_time,
.read_alarm = bd70528_read_alarm,
.set_alarm = bd70528_set_alarm,
.alarm_irq_enable = bd70528_alm_enable,
};
static const struct rtc_class_ops bd71828_rtc_ops = { static const struct rtc_class_ops bd71828_rtc_ops = {
.read_time = bd70528_get_time, .read_time = bd70528_get_time,
.set_time = bd71828_set_time, .set_time = bd71828_set_time,
@ -503,7 +241,6 @@ static int bd70528_probe(struct platform_device *pdev)
struct rtc_device *rtc; struct rtc_device *rtc;
int irq; int irq;
unsigned int hr; unsigned int hr;
bool enable_main_irq = false;
u8 hour_reg; u8 hour_reg;
enum rohm_chip_type chip = platform_get_device_id(pdev)->driver_data; enum rohm_chip_type chip = platform_get_device_id(pdev)->driver_data;
@ -518,21 +255,9 @@ static int bd70528_probe(struct platform_device *pdev)
} }
bd_rtc->dev = &pdev->dev; bd_rtc->dev = &pdev->dev;
rtc_ops = &bd71828_rtc_ops;
switch (chip) { switch (chip) {
case ROHM_CHIP_TYPE_BD70528:
bd_rtc->parent = dev_get_drvdata(pdev->dev.parent);
if (!bd_rtc->parent) {
dev_err(&pdev->dev, "No MFD data\n");
return -EINVAL;
}
irq_name = "bd70528-rtc-alm";
bd_rtc->has_rtc_timers = true;
bd_rtc->reg_time_start = BD70528_REG_RTC_START;
hour_reg = BD70528_REG_RTC_HOUR;
enable_main_irq = true;
rtc_ops = &bd70528_rtc_ops;
break;
case ROHM_CHIP_TYPE_BD71815: case ROHM_CHIP_TYPE_BD71815:
irq_name = "bd71815-rtc-alm-0"; irq_name = "bd71815-rtc-alm-0";
bd_rtc->reg_time_start = BD71815_REG_RTC_START; bd_rtc->reg_time_start = BD71815_REG_RTC_START;
@ -549,14 +274,12 @@ static int bd70528_probe(struct platform_device *pdev)
*/ */
bd_rtc->bd718xx_alm_block_start = BD71815_REG_RTC_ALM_START; bd_rtc->bd718xx_alm_block_start = BD71815_REG_RTC_ALM_START;
hour_reg = BD71815_REG_HOUR; hour_reg = BD71815_REG_HOUR;
rtc_ops = &bd71828_rtc_ops;
break; break;
case ROHM_CHIP_TYPE_BD71828: case ROHM_CHIP_TYPE_BD71828:
irq_name = "bd71828-rtc-alm-0"; irq_name = "bd71828-rtc-alm-0";
bd_rtc->reg_time_start = BD71828_REG_RTC_START; bd_rtc->reg_time_start = BD71828_REG_RTC_START;
bd_rtc->bd718xx_alm_block_start = BD71828_REG_RTC_ALM_START; bd_rtc->bd718xx_alm_block_start = BD71828_REG_RTC_ALM_START;
hour_reg = BD71828_REG_RTC_HOUR; hour_reg = BD71828_REG_RTC_HOUR;
rtc_ops = &bd71828_rtc_ops;
break; break;
default: default:
dev_err(&pdev->dev, "Unknown chip\n"); dev_err(&pdev->dev, "Unknown chip\n");
@ -611,27 +334,10 @@ static int bd70528_probe(struct platform_device *pdev)
if (ret) if (ret)
return ret; return ret;
/*
* BD70528 irq controller is not touching the main mask register.
* So enable the RTC block interrupts at main level. We can just
* leave them enabled as irq-controller should disable irqs
* from sub-registers when IRQ is disabled or freed.
*/
if (enable_main_irq) {
ret = regmap_update_bits(bd_rtc->regmap,
BD70528_REG_INT_MAIN_MASK,
BD70528_INT_RTC_MASK, 0);
if (ret) {
dev_err(&pdev->dev, "Failed to enable RTC interrupts\n");
return ret;
}
}
return devm_rtc_register_device(rtc); return devm_rtc_register_device(rtc);
} }
static const struct platform_device_id bd718x7_rtc_id[] = { static const struct platform_device_id bd718x7_rtc_id[] = {
{ "bd70528-rtc", ROHM_CHIP_TYPE_BD70528 },
{ "bd71828-rtc", ROHM_CHIP_TYPE_BD71828 }, { "bd71828-rtc", ROHM_CHIP_TYPE_BD71828 },
{ "bd71815-rtc", ROHM_CHIP_TYPE_BD71815 }, { "bd71815-rtc", ROHM_CHIP_TYPE_BD71815 },
{ }, { },
@ -649,6 +355,6 @@ static struct platform_driver bd70528_rtc = {
module_platform_driver(bd70528_rtc); module_platform_driver(bd70528_rtc);
MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>"); MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>");
MODULE_DESCRIPTION("ROHM BD70528 and BD71828 PMIC RTC driver"); MODULE_DESCRIPTION("ROHM BD71828 and BD71815 PMIC RTC driver");
MODULE_LICENSE("GPL"); MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:bd70528-rtc"); MODULE_ALIAS("platform:bd70528-rtc");