From: Biwen Li <[email protected]>
- clear the flag TSF1 before enabling interrupt generation
- properly set flag WD_CD for rtc chips(pcf2129, pca2129)
Signed-off-by: Biwen Li <[email protected]>
---
drivers/rtc/rtc-pcf2127.c | 21 ++++++++++++++++++++-
1 file changed, 20 insertions(+), 1 deletion(-)
diff --git a/drivers/rtc/rtc-pcf2127.c b/drivers/rtc/rtc-pcf2127.c
index 07a5630ec841..0a45e2512258 100644
--- a/drivers/rtc/rtc-pcf2127.c
+++ b/drivers/rtc/rtc-pcf2127.c
@@ -601,6 +601,10 @@ static int pcf2127_probe(struct device *dev, struct regmap *regmap,
* Watchdog timer enabled and reset pin /RST activated when timed out.
* Select 1Hz clock source for watchdog timer.
* Note: Countdown timer disabled and not available.
+ * For pca2129, pcf2129, only bit[7] is for Symbol WD_CD
+ * of register watchdg_tim_ctl. The bit[6] is labeled
+ * as T. Bits labeled as T must always be written with
+ * logic 0.
*/
ret = regmap_update_bits(pcf2127->regmap, PCF2127_REG_WD_CTL,
PCF2127_BIT_WD_CTL_CD1 |
@@ -608,7 +612,7 @@ static int pcf2127_probe(struct device *dev, struct regmap *regmap,
PCF2127_BIT_WD_CTL_TF1 |
PCF2127_BIT_WD_CTL_TF0,
PCF2127_BIT_WD_CTL_CD1 |
- PCF2127_BIT_WD_CTL_CD0 |
+ has_nvmem ? (PCF2127_BIT_WD_CTL_CD0) : (0) |
PCF2127_BIT_WD_CTL_TF1);
if (ret) {
dev_err(dev, "%s: watchdog config (wd_ctl) failed\n", __func__);
@@ -659,6 +663,21 @@ static int pcf2127_probe(struct device *dev, struct regmap *regmap,
return ret;
}
+ /*
+ * Clear TSF1 field of ctrl1 register to clear interrupt
+ * before enabling interrupt generation when
+ * timestamp flag set. Unless the flag TSF1 won't
+ * be cleared and the interrupt(INT pin) is
+ * triggered continueously.
+ */
+ ret = regmap_update_bits(pcf2127->regmap, PCF2127_REG_CTRL1,
+ PCF2127_BIT_CTRL1_TSF1,
+ 0);
+ if (ret) {
+ dev_err(dev, "%s: control and status register 1 (ctrl1) failed, ret = 0x%x\n",
+ __func__, ret);
+ return ret;
+ }
/*
* Enable interrupt generation when TSF1 or TSF2 timestamp flags
* are set. Interrupt signal is an open-drain output and can be
--
2.17.1
Hi Biwen,
Thank you for the patch! Perhaps something to improve:
[auto build test WARNING on abelloni/rtc-next]
[also build test WARNING on v5.10-rc6 next-20201130]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]
url: https://github.com/0day-ci/linux/commits/Biwen-Li/rtc-pcf2127-clear-the-flag-TSF1-before-enabling-interrupt-generation/20201201-165409
base: https://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux.git rtc-next
config: mips-randconfig-r023-20201201 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project ac40a2d8f16b8a8c68fc811d67f647740e965cb8)
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# install mips cross compiling tool for clang build
# apt-get install binutils-mips-linux-gnu
# https://github.com/0day-ci/linux/commit/54db60db88e4fd3ab6ac26f9a5b4768316347f95
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review Biwen-Li/rtc-pcf2127-clear-the-flag-TSF1-before-enabling-interrupt-generation/20201201-165409
git checkout 54db60db88e4fd3ab6ac26f9a5b4768316347f95
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=mips
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <[email protected]>
All warnings (new ones prefixed by >>):
>> drivers/rtc/rtc-pcf2127.c:629:16: warning: operator has lower precedence than '|'; '|' will be evaluated first
has_nvmem (PCF2127_BIT_WD_CTL_CD0) : (0) |
~~~~~~~~~ ^
drivers/rtc/rtc-pcf2127.c:629:16: note: place parentheses around the '|' expression to silence this warning
has_nvmem (PCF2127_BIT_WD_CTL_CD0) : (0) |
~~~~~~~~~ ^
drivers/rtc/rtc-pcf2127.c:629:16: note: place parentheses around the expression to evaluate it first
has_nvmem (PCF2127_BIT_WD_CTL_CD0) : (0) |
~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
fatal error: error in backend: Nested variants found in inline asm string: ' .set push
.set mips64r2
.if ( 0x00 ) != -1)) 0x00 ) != -1)) : ($( static struct ftrace_branch_data __attribute__((__aligned__(4))) __attribute__((__section__("_ftrace_branch"))) __if_trace = $( .func = __func__, .file = "arch/mips/include/asm/bitops.h", .line = 105, $); 0x00 ) != -1)) : $))) ) && ( 0 ); .set push; .set mips64r2; .rept 1; sync 0x00; .endr; .set pop; .else; ; .endif
1: ll $0, $1
or $0, $2
sc $0, $1
beqz $0, 1b
.set pop
'
clang-12: error: clang frontend command failed with exit code 70 (use -v to see invocation)
clang version 12.0.0 (git://gitmirror/llvm_project ac40a2d8f16b8a8c68fc811d67f647740e965cb8)
Target: mips-unknown-linux-gnu
Thread model: posix
InstalledDir: /opt/cross/clang-ac40a2d8f1/bin
clang-12: note: diagnostic msg:
Makefile arch drivers include kernel scripts source usr
vim +629 drivers/rtc/rtc-pcf2127.c
560
561 static int pcf2127_probe(struct device *dev, struct regmap *regmap,
562 int alarm_irq, const char *name, bool has_nvmem)
563 {
564 struct pcf2127 *pcf2127;
565 int ret = 0;
566
567 dev_dbg(dev, "%s\n", __func__);
568
569 pcf2127 = devm_kzalloc(dev, sizeof(*pcf2127), GFP_KERNEL);
570 if (!pcf2127)
571 return -ENOMEM;
572
573 pcf2127->regmap = regmap;
574
575 dev_set_drvdata(dev, pcf2127);
576
577 pcf2127->rtc = devm_rtc_allocate_device(dev);
578 if (IS_ERR(pcf2127->rtc))
579 return PTR_ERR(pcf2127->rtc);
580
581 pcf2127->rtc->ops = &pcf2127_rtc_ops;
582 pcf2127->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
583 pcf2127->rtc->range_max = RTC_TIMESTAMP_END_2099;
584 pcf2127->rtc->set_start_time = true; /* Sets actual start to 1970 */
585 pcf2127->rtc->uie_unsupported = 1;
586
587 if (alarm_irq > 0) {
588 ret = devm_request_threaded_irq(dev, alarm_irq, NULL,
589 pcf2127_rtc_irq,
590 IRQF_TRIGGER_LOW | IRQF_ONESHOT,
591 dev_name(dev), dev);
592 if (ret) {
593 dev_err(dev, "failed to request alarm irq\n");
594 return ret;
595 }
596 }
597
598 if (alarm_irq > 0 || device_property_read_bool(dev, "wakeup-source")) {
599 device_init_wakeup(dev, true);
600 pcf2127->rtc->ops = &pcf2127_rtc_alrm_ops;
601 }
602
603 if (has_nvmem) {
604 struct nvmem_config nvmem_cfg = {
605 .priv = pcf2127,
606 .reg_read = pcf2127_nvmem_read,
607 .reg_write = pcf2127_nvmem_write,
608 .size = 512,
609 };
610
611 ret = devm_rtc_nvmem_register(pcf2127->rtc, &nvmem_cfg);
612 }
613
614 /*
615 * Watchdog timer enabled and reset pin /RST activated when timed out.
616 * Select 1Hz clock source for watchdog timer.
617 * Note: Countdown timer disabled and not available.
618 * For pca2129, pcf2129, only bit[7] is for Symbol WD_CD
619 * of register watchdg_tim_ctl. The bit[6] is labeled
620 * as T. Bits labeled as T must always be written with
621 * logic 0.
622 */
623 ret = regmap_update_bits(pcf2127->regmap, PCF2127_REG_WD_CTL,
624 PCF2127_BIT_WD_CTL_CD1 |
625 PCF2127_BIT_WD_CTL_CD0 |
626 PCF2127_BIT_WD_CTL_TF1 |
627 PCF2127_BIT_WD_CTL_TF0,
628 PCF2127_BIT_WD_CTL_CD1 |
> 629 has_nvmem ? (PCF2127_BIT_WD_CTL_CD0) : (0) |
630 PCF2127_BIT_WD_CTL_TF1);
631 if (ret) {
632 dev_err(dev, "%s: watchdog config (wd_ctl) failed\n", __func__);
633 return ret;
634 }
635
636 pcf2127_watchdog_init(dev, pcf2127);
637
638 /*
639 * Disable battery low/switch-over timestamp and interrupts.
640 * Clear battery interrupt flags which can block new trigger events.
641 * Note: This is the default chip behaviour but added to ensure
642 * correct tamper timestamp and interrupt function.
643 */
644 ret = regmap_update_bits(pcf2127->regmap, PCF2127_REG_CTRL3,
645 PCF2127_BIT_CTRL3_BTSE |
646 PCF2127_BIT_CTRL3_BIE |
647 PCF2127_BIT_CTRL3_BLIE, 0);
648 if (ret) {
649 dev_err(dev, "%s: interrupt config (ctrl3) failed\n",
650 __func__);
651 return ret;
652 }
653
654 /*
655 * Enable timestamp function and store timestamp of first trigger
656 * event until TSF1 and TFS2 interrupt flags are cleared.
657 */
658 ret = regmap_update_bits(pcf2127->regmap, PCF2127_REG_TS_CTRL,
659 PCF2127_BIT_TS_CTRL_TSOFF |
660 PCF2127_BIT_TS_CTRL_TSM,
661 PCF2127_BIT_TS_CTRL_TSM);
662 if (ret) {
663 dev_err(dev, "%s: tamper detection config (ts_ctrl) failed\n",
664 __func__);
665 return ret;
666 }
667
668 /*
669 * Clear TSF1 field of ctrl1 register to clear interrupt
670 * before enabling interrupt generation when
671 * timestamp flag set. Unless the flag TSF1 won't
672 * be cleared and the interrupt(INT pin) is
673 * triggered continueously.
674 */
675 ret = regmap_update_bits(pcf2127->regmap, PCF2127_REG_CTRL1,
676 PCF2127_BIT_CTRL1_TSF1,
677 0);
678 if (ret) {
679 dev_err(dev, "%s: control and status register 1 (ctrl1) failed, ret = 0x%x\n",
680 __func__, ret);
681 return ret;
682 }
683 /*
684 * Enable interrupt generation when TSF1 or TSF2 timestamp flags
685 * are set. Interrupt signal is an open-drain output and can be
686 * left floating if unused.
687 */
688 ret = regmap_update_bits(pcf2127->regmap, PCF2127_REG_CTRL2,
689 PCF2127_BIT_CTRL2_TSIE,
690 PCF2127_BIT_CTRL2_TSIE);
691 if (ret) {
692 dev_err(dev, "%s: tamper detection config (ctrl2) failed\n",
693 __func__);
694 return ret;
695 }
696
697 ret = rtc_add_group(pcf2127->rtc, &pcf2127_attr_group);
698 if (ret) {
699 dev_err(dev, "%s: tamper sysfs registering failed\n",
700 __func__);
701 return ret;
702 }
703
704 return devm_rtc_register_device(pcf2127->rtc);
705 }
706
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/[email protected]
Hi,
On 01/12/2020 16:47:46+0800, Biwen Li wrote:
> From: Biwen Li <[email protected]>
>
> - clear the flag TSF1 before enabling interrupt generation
> - properly set flag WD_CD for rtc chips(pcf2129, pca2129)
>
This change has to be a separate patch.
> Signed-off-by: Biwen Li <[email protected]>
> ---
> drivers/rtc/rtc-pcf2127.c | 21 ++++++++++++++++++++-
> 1 file changed, 20 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/rtc/rtc-pcf2127.c b/drivers/rtc/rtc-pcf2127.c
> index 07a5630ec841..0a45e2512258 100644
> --- a/drivers/rtc/rtc-pcf2127.c
> +++ b/drivers/rtc/rtc-pcf2127.c
> @@ -601,6 +601,10 @@ static int pcf2127_probe(struct device *dev, struct regmap *regmap,
> * Watchdog timer enabled and reset pin /RST activated when timed out.
> * Select 1Hz clock source for watchdog timer.
> * Note: Countdown timer disabled and not available.
> + * For pca2129, pcf2129, only bit[7] is for Symbol WD_CD
> + * of register watchdg_tim_ctl. The bit[6] is labeled
> + * as T. Bits labeled as T must always be written with
> + * logic 0.
> */
> ret = regmap_update_bits(pcf2127->regmap, PCF2127_REG_WD_CTL,
> PCF2127_BIT_WD_CTL_CD1 |
> @@ -608,7 +612,7 @@ static int pcf2127_probe(struct device *dev, struct regmap *regmap,
> PCF2127_BIT_WD_CTL_TF1 |
> PCF2127_BIT_WD_CTL_TF0,
> PCF2127_BIT_WD_CTL_CD1 |
> - PCF2127_BIT_WD_CTL_CD0 |
> + has_nvmem ? (PCF2127_BIT_WD_CTL_CD0) : (0) |
I don't like that because has_nvmem has nothing to do with
PCF2127_BIT_WD_CTL_CD0 and nothing guarantees that we won't ever get an
RTC without RST but with NVRAM and that willprobbly be overlooked.
> PCF2127_BIT_WD_CTL_TF1);
> if (ret) {
> dev_err(dev, "%s: watchdog config (wd_ctl) failed\n", __func__);
> @@ -659,6 +663,21 @@ static int pcf2127_probe(struct device *dev, struct regmap *regmap,
> return ret;
> }
>
> + /*
> + * Clear TSF1 field of ctrl1 register to clear interrupt
> + * before enabling interrupt generation when
> + * timestamp flag set. Unless the flag TSF1 won't
> + * be cleared and the interrupt(INT pin) is
> + * triggered continueously.
> + */
> + ret = regmap_update_bits(pcf2127->regmap, PCF2127_REG_CTRL1,
> + PCF2127_BIT_CTRL1_TSF1,
> + 0);
> + if (ret) {
> + dev_err(dev, "%s: control and status register 1 (ctrl1) failed, ret = 0x%x\n",
> + __func__, ret);
> + return ret;
> + }
Doing that means ignoring timestamps taken while the system is offline.
It also doesn't fully solve the issue because you are not clearing TSF2
here and also it never gets cleared by the driver later on so I guess
you will get the interrupt storm once a timestamp is taken.
--
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
>
> Hi,
>
> On 01/12/2020 16:47:46+0800, Biwen Li wrote:
> > From: Biwen Li <[email protected]>
> >
> > - clear the flag TSF1 before enabling interrupt generation
> > - properly set flag WD_CD for rtc chips(pcf2129, pca2129)
> >
>
> This change has to be a separate patch.
Sure, np. Will separate the patch in v2.
>
> > Signed-off-by: Biwen Li <[email protected]>
> > ---
> > drivers/rtc/rtc-pcf2127.c | 21 ++++++++++++++++++++-
> > 1 file changed, 20 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/rtc/rtc-pcf2127.c b/drivers/rtc/rtc-pcf2127.c
> > index 07a5630ec841..0a45e2512258 100644
> > --- a/drivers/rtc/rtc-pcf2127.c
> > +++ b/drivers/rtc/rtc-pcf2127.c
> > @@ -601,6 +601,10 @@ static int pcf2127_probe(struct device *dev, struct
> regmap *regmap,
> > * Watchdog timer enabled and reset pin /RST activated when timed out.
> > * Select 1Hz clock source for watchdog timer.
> > * Note: Countdown timer disabled and not available.
> > + * For pca2129, pcf2129, only bit[7] is for Symbol WD_CD
> > + * of register watchdg_tim_ctl. The bit[6] is labeled
> > + * as T. Bits labeled as T must always be written with
> > + * logic 0.
> > */
> > ret = regmap_update_bits(pcf2127->regmap, PCF2127_REG_WD_CTL,
> > PCF2127_BIT_WD_CTL_CD1 |
> > @@ -608,7 +612,7 @@ static int pcf2127_probe(struct device *dev, struct
> regmap *regmap,
> > PCF2127_BIT_WD_CTL_TF1 |
> > PCF2127_BIT_WD_CTL_TF0,
> > PCF2127_BIT_WD_CTL_CD1 |
> > - PCF2127_BIT_WD_CTL_CD0 |
> > + has_nvmem ? (PCF2127_BIT_WD_CTL_CD0) : (0) |
>
> I don't like that because has_nvmem has nothing to do with
> PCF2127_BIT_WD_CTL_CD0 and nothing guarantees that we won't ever get an
> RTC without RST but with NVRAM and that willprobbly be overlooked.
Okay, got it. Will correct it in v2.
>
> > PCF2127_BIT_WD_CTL_TF1);
> > if (ret) {
> > dev_err(dev, "%s: watchdog config (wd_ctl) failed\n", __func__); @@
> > -659,6 +663,21 @@ static int pcf2127_probe(struct device *dev, struct
> regmap *regmap,
> > return ret;
> > }
> >
> > + /*
> > + * Clear TSF1 field of ctrl1 register to clear interrupt
> > + * before enabling interrupt generation when
> > + * timestamp flag set. Unless the flag TSF1 won't
> > + * be cleared and the interrupt(INT pin) is
> > + * triggered continueously.
> > + */
> > + ret = regmap_update_bits(pcf2127->regmap, PCF2127_REG_CTRL1,
> > + PCF2127_BIT_CTRL1_TSF1,
> > + 0);
> > + if (ret) {
> > + dev_err(dev, "%s: control and status register 1 (ctrl1) failed, ret =
> 0x%x\n",
> > + __func__, ret);
> > + return ret;
> > + }
>
> Doing that means ignoring timestamps taken while the system is offline.
> It also doesn't fully solve the issue because you are not clearing TSF2 here and
> also it never gets cleared by the driver later on so I guess you will get the
> interrupt storm once a timestamp is taken.
Okay, got it. Thanks. Will clear TSF2 flag in v2.
>
>
> --
> Alexandre Belloni, Bootlin
> Embedded Linux and Kernel engineering
> https://bootlin.com
Hi Biwen,
Thank you for the patch! Perhaps something to improve:
[auto build test WARNING on abelloni/rtc-next]
[also build test WARNING on v5.10-rc6 next-20201201]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]
url: https://github.com/0day-ci/linux/commits/Biwen-Li/rtc-pcf2127-clear-the-flag-TSF1-before-enabling-interrupt-generation/20201201-165409
base: https://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux.git rtc-next
config: arm64-randconfig-r014-20201202 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 2671fccf0381769276ca8246ec0499adcb9b0355)
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# install arm64 cross compiling tool for clang build
# apt-get install binutils-aarch64-linux-gnu
# https://github.com/0day-ci/linux/commit/54db60db88e4fd3ab6ac26f9a5b4768316347f95
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review Biwen-Li/rtc-pcf2127-clear-the-flag-TSF1-before-enabling-interrupt-generation/20201201-165409
git checkout 54db60db88e4fd3ab6ac26f9a5b4768316347f95
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm64
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <[email protected]>
All warnings (new ones prefixed by >>):
>> drivers/rtc/rtc-pcf2127.c:629:16: warning: operator '?:' has lower precedence than '|'; '|' will be evaluated first [-Wbitwise-conditional-parentheses]
has_nvmem ? (PCF2127_BIT_WD_CTL_CD0) : (0) |
~~~~~~~~~ ^
drivers/rtc/rtc-pcf2127.c:629:16: note: place parentheses around the '|' expression to silence this warning
has_nvmem ? (PCF2127_BIT_WD_CTL_CD0) : (0) |
~~~~~~~~~ ^
drivers/rtc/rtc-pcf2127.c:629:16: note: place parentheses around the '?:' expression to evaluate it first
has_nvmem ? (PCF2127_BIT_WD_CTL_CD0) : (0) |
~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 warning generated.
vim +629 drivers/rtc/rtc-pcf2127.c
560
561 static int pcf2127_probe(struct device *dev, struct regmap *regmap,
562 int alarm_irq, const char *name, bool has_nvmem)
563 {
564 struct pcf2127 *pcf2127;
565 int ret = 0;
566
567 dev_dbg(dev, "%s\n", __func__);
568
569 pcf2127 = devm_kzalloc(dev, sizeof(*pcf2127), GFP_KERNEL);
570 if (!pcf2127)
571 return -ENOMEM;
572
573 pcf2127->regmap = regmap;
574
575 dev_set_drvdata(dev, pcf2127);
576
577 pcf2127->rtc = devm_rtc_allocate_device(dev);
578 if (IS_ERR(pcf2127->rtc))
579 return PTR_ERR(pcf2127->rtc);
580
581 pcf2127->rtc->ops = &pcf2127_rtc_ops;
582 pcf2127->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
583 pcf2127->rtc->range_max = RTC_TIMESTAMP_END_2099;
584 pcf2127->rtc->set_start_time = true; /* Sets actual start to 1970 */
585 pcf2127->rtc->uie_unsupported = 1;
586
587 if (alarm_irq > 0) {
588 ret = devm_request_threaded_irq(dev, alarm_irq, NULL,
589 pcf2127_rtc_irq,
590 IRQF_TRIGGER_LOW | IRQF_ONESHOT,
591 dev_name(dev), dev);
592 if (ret) {
593 dev_err(dev, "failed to request alarm irq\n");
594 return ret;
595 }
596 }
597
598 if (alarm_irq > 0 || device_property_read_bool(dev, "wakeup-source")) {
599 device_init_wakeup(dev, true);
600 pcf2127->rtc->ops = &pcf2127_rtc_alrm_ops;
601 }
602
603 if (has_nvmem) {
604 struct nvmem_config nvmem_cfg = {
605 .priv = pcf2127,
606 .reg_read = pcf2127_nvmem_read,
607 .reg_write = pcf2127_nvmem_write,
608 .size = 512,
609 };
610
611 ret = devm_rtc_nvmem_register(pcf2127->rtc, &nvmem_cfg);
612 }
613
614 /*
615 * Watchdog timer enabled and reset pin /RST activated when timed out.
616 * Select 1Hz clock source for watchdog timer.
617 * Note: Countdown timer disabled and not available.
618 * For pca2129, pcf2129, only bit[7] is for Symbol WD_CD
619 * of register watchdg_tim_ctl. The bit[6] is labeled
620 * as T. Bits labeled as T must always be written with
621 * logic 0.
622 */
623 ret = regmap_update_bits(pcf2127->regmap, PCF2127_REG_WD_CTL,
624 PCF2127_BIT_WD_CTL_CD1 |
625 PCF2127_BIT_WD_CTL_CD0 |
626 PCF2127_BIT_WD_CTL_TF1 |
627 PCF2127_BIT_WD_CTL_TF0,
628 PCF2127_BIT_WD_CTL_CD1 |
> 629 has_nvmem ? (PCF2127_BIT_WD_CTL_CD0) : (0) |
630 PCF2127_BIT_WD_CTL_TF1);
631 if (ret) {
632 dev_err(dev, "%s: watchdog config (wd_ctl) failed\n", __func__);
633 return ret;
634 }
635
636 pcf2127_watchdog_init(dev, pcf2127);
637
638 /*
639 * Disable battery low/switch-over timestamp and interrupts.
640 * Clear battery interrupt flags which can block new trigger events.
641 * Note: This is the default chip behaviour but added to ensure
642 * correct tamper timestamp and interrupt function.
643 */
644 ret = regmap_update_bits(pcf2127->regmap, PCF2127_REG_CTRL3,
645 PCF2127_BIT_CTRL3_BTSE |
646 PCF2127_BIT_CTRL3_BIE |
647 PCF2127_BIT_CTRL3_BLIE, 0);
648 if (ret) {
649 dev_err(dev, "%s: interrupt config (ctrl3) failed\n",
650 __func__);
651 return ret;
652 }
653
654 /*
655 * Enable timestamp function and store timestamp of first trigger
656 * event until TSF1 and TFS2 interrupt flags are cleared.
657 */
658 ret = regmap_update_bits(pcf2127->regmap, PCF2127_REG_TS_CTRL,
659 PCF2127_BIT_TS_CTRL_TSOFF |
660 PCF2127_BIT_TS_CTRL_TSM,
661 PCF2127_BIT_TS_CTRL_TSM);
662 if (ret) {
663 dev_err(dev, "%s: tamper detection config (ts_ctrl) failed\n",
664 __func__);
665 return ret;
666 }
667
668 /*
669 * Clear TSF1 field of ctrl1 register to clear interrupt
670 * before enabling interrupt generation when
671 * timestamp flag set. Unless the flag TSF1 won't
672 * be cleared and the interrupt(INT pin) is
673 * triggered continueously.
674 */
675 ret = regmap_update_bits(pcf2127->regmap, PCF2127_REG_CTRL1,
676 PCF2127_BIT_CTRL1_TSF1,
677 0);
678 if (ret) {
679 dev_err(dev, "%s: control and status register 1 (ctrl1) failed, ret = 0x%x\n",
680 __func__, ret);
681 return ret;
682 }
683 /*
684 * Enable interrupt generation when TSF1 or TSF2 timestamp flags
685 * are set. Interrupt signal is an open-drain output and can be
686 * left floating if unused.
687 */
688 ret = regmap_update_bits(pcf2127->regmap, PCF2127_REG_CTRL2,
689 PCF2127_BIT_CTRL2_TSIE,
690 PCF2127_BIT_CTRL2_TSIE);
691 if (ret) {
692 dev_err(dev, "%s: tamper detection config (ctrl2) failed\n",
693 __func__);
694 return ret;
695 }
696
697 ret = rtc_add_group(pcf2127->rtc, &pcf2127_attr_group);
698 if (ret) {
699 dev_err(dev, "%s: tamper sysfs registering failed\n",
700 __func__);
701 return ret;
702 }
703
704 return devm_rtc_register_device(pcf2127->rtc);
705 }
706
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0-DAY CI Kernel Test Service, Intel Corporation
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