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* [PATCH v3] rtc: ds1307: add support for watchdog timer on ds1388
@ 2020-03-30  2:55 Chris Packham
  2020-03-30 15:33 ` Guenter Roeck
  2020-03-30 18:39 ` Alexandre Belloni
  0 siblings, 2 replies; 3+ messages in thread
From: Chris Packham @ 2020-03-30  2:55 UTC (permalink / raw)
  To: a.zummo, alexandre.belloni, wim, linux
  Cc: linux-rtc, linux-watchdog, linux-kernel, Chris Packham

The DS1388 variant has watchdog timer capabilities. When using a DS1388
and having enabled CONFIG_WATCHDOG_CORE register a watchdog device for
the DS1388.

Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
---
Changes in v3:
- Address review comments from Guenter. Add select WATCHDOG_CORE, remove
  unnecessary wdt member, add set_timeout op, use devm_watchdog_register
Changes in v2:
- Address review comments from Alexandre, the only functional change is setting
  the hundredths of seconds to 0 instead of 99.

 drivers/rtc/Kconfig      |   1 +
 drivers/rtc/rtc-ds1307.c | 115 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 116 insertions(+)

diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 34c8b6c7e095..729851a38511 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -241,6 +241,7 @@ config RTC_DRV_AS3722
 config RTC_DRV_DS1307
 	tristate "Dallas/Maxim DS1307/37/38/39/40/41, ST M41T00, EPSON RX-8025, ISL12057"
 	select REGMAP_I2C
+	select WATCHDOG_CORE if WATCHDOG
 	help
 	  If you say yes here you get support for various compatible RTC
 	  chips (often with battery backup) connected with I2C. This driver
diff --git a/drivers/rtc/rtc-ds1307.c b/drivers/rtc/rtc-ds1307.c
index 31a38d468378..fad042118862 100644
--- a/drivers/rtc/rtc-ds1307.c
+++ b/drivers/rtc/rtc-ds1307.c
@@ -22,6 +22,7 @@
 #include <linux/hwmon-sysfs.h>
 #include <linux/clk-provider.h>
 #include <linux/regmap.h>
+#include <linux/watchdog.h>
 
 /*
  * We can't determine type by probing, but if we expect pre-Linux code
@@ -144,8 +145,15 @@ enum ds_type {
 #	define M41TXX_BIT_CALIB_SIGN	BIT(5)
 #	define M41TXX_M_CALIBRATION	GENMASK(4, 0)
 
+#define DS1388_REG_WDOG_HUN_SECS	0x08
+#define DS1388_REG_WDOG_SECS		0x09
 #define DS1388_REG_FLAG			0x0b
+#	define DS1388_BIT_WF		BIT(6)
 #	define DS1388_BIT_OSF		BIT(7)
+#define DS1388_REG_CONTROL		0x0c
+#	define DS1388_BIT_RST		BIT(0)
+#	define DS1388_BIT_WDE		BIT(1)
+
 /* negative offset step is -2.034ppm */
 #define M41TXX_NEG_OFFSET_STEP_PPB	2034
 /* positive offset step is +4.068ppm */
@@ -854,6 +862,72 @@ static int m41txx_rtc_set_offset(struct device *dev, long offset)
 				  ctrl_reg);
 }
 
+#ifdef CONFIG_WATCHDOG_CORE
+static int ds1388_wdt_start(struct watchdog_device *wdt_dev)
+{
+	struct ds1307 *ds1307 = watchdog_get_drvdata(wdt_dev);
+	u8 regs[2];
+	int ret;
+
+	ret = regmap_update_bits(ds1307->regmap, DS1388_REG_FLAG,
+				 DS1388_BIT_WF, 0);
+	if (ret)
+		return ret;
+
+	ret = regmap_update_bits(ds1307->regmap, DS1388_REG_CONTROL,
+				 DS1388_BIT_WDE | DS1388_BIT_RST, 0);
+	if (ret)
+		return ret;
+
+	/*
+	 * watchdog timeouts are measured in seconds. So ignore hundredths of
+	 * seconds field.
+	 */
+	regs[0] = 0;
+	regs[1] = bin2bcd(wdt_dev->timeout);
+
+	ret = regmap_bulk_write(ds1307->regmap, DS1388_REG_WDOG_HUN_SECS, regs,
+				sizeof(regs));
+	if (ret)
+		return ret;
+
+	return regmap_update_bits(ds1307->regmap, DS1388_REG_CONTROL,
+				  DS1388_BIT_WDE | DS1388_BIT_RST,
+				  DS1388_BIT_WDE | DS1388_BIT_RST);
+}
+
+static int ds1388_wdt_stop(struct watchdog_device *wdt_dev)
+{
+	struct ds1307 *ds1307 = watchdog_get_drvdata(wdt_dev);
+
+	return regmap_update_bits(ds1307->regmap, DS1388_REG_CONTROL,
+				  DS1388_BIT_WDE | DS1388_BIT_RST, 0);
+}
+
+static int ds1388_wdt_ping(struct watchdog_device *wdt_dev)
+{
+	struct ds1307 *ds1307 = watchdog_get_drvdata(wdt_dev);
+	u8 regs[2];
+
+	return regmap_bulk_read(ds1307->regmap, DS1388_REG_WDOG_HUN_SECS, regs,
+				sizeof(regs));
+}
+
+static int ds1388_wdt_set_timeout(struct watchdog_device *wdt_dev,
+				  unsigned int val)
+{
+	struct ds1307 *ds1307 = watchdog_get_drvdata(wdt_dev);
+	u8 regs[2];
+
+	wdt_dev->timeout = val;
+	regs[0] = 0;
+	regs[1] = bin2bcd(wdt_dev->timeout);
+
+	return regmap_bulk_write(ds1307->regmap, DS1388_REG_WDOG_HUN_SECS, regs,
+				 sizeof(regs));
+}
+#endif
+
 static const struct rtc_class_ops rx8130_rtc_ops = {
 	.read_time      = ds1307_get_time,
 	.set_time       = ds1307_set_time,
@@ -1576,6 +1650,46 @@ static void ds1307_clks_register(struct ds1307 *ds1307)
 
 #endif /* CONFIG_COMMON_CLK */
 
+#ifdef CONFIG_WATCHDOG_CORE
+static const struct watchdog_info ds1388_wdt_info = {
+	.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
+	.identity = "DS1388 watchdog",
+};
+
+static const struct watchdog_ops ds1388_wdt_ops = {
+	.owner = THIS_MODULE,
+	.start = ds1388_wdt_start,
+	.stop = ds1388_wdt_stop,
+	.ping = ds1388_wdt_ping,
+	.set_timeout = ds1388_wdt_set_timeout,
+
+};
+
+static void ds1307_wdt_register(struct ds1307 *ds1307)
+{
+	struct watchdog_device	*wdt;
+
+	if (ds1307->type != ds_1388)
+		return;
+
+	wdt = devm_kzalloc(ds1307->dev, sizeof(*wdt), GFP_KERNEL);
+
+	wdt->info = &ds1388_wdt_info;
+	wdt->ops = &ds1388_wdt_ops;
+	wdt->timeout = 99;
+	wdt->max_timeout = 99;
+	wdt->min_timeout = 1;
+
+	watchdog_init_timeout(wdt, 0, ds1307->dev);
+	watchdog_set_drvdata(wdt, ds1307);
+	devm_watchdog_register_device(ds1307->dev, wdt);
+}
+#else
+static void ds1307_wdt_register(struct ds1307 *ds1307)
+{
+}
+#endif /* CONFIG_WATCHDOG_CORE */
+
 static const struct regmap_config regmap_config = {
 	.reg_bits = 8,
 	.val_bits = 8,
@@ -1865,6 +1979,7 @@ static int ds1307_probe(struct i2c_client *client,
 
 	ds1307_hwmon_register(ds1307);
 	ds1307_clks_register(ds1307);
+	ds1307_wdt_register(ds1307);
 
 	return 0;
 
-- 
2.25.1


^ permalink raw reply	[flat|nested] 3+ messages in thread

* Re: [PATCH v3] rtc: ds1307: add support for watchdog timer on ds1388
  2020-03-30  2:55 [PATCH v3] rtc: ds1307: add support for watchdog timer on ds1388 Chris Packham
@ 2020-03-30 15:33 ` Guenter Roeck
  2020-03-30 18:39 ` Alexandre Belloni
  1 sibling, 0 replies; 3+ messages in thread
From: Guenter Roeck @ 2020-03-30 15:33 UTC (permalink / raw)
  To: Chris Packham, a.zummo, alexandre.belloni, wim
  Cc: linux-rtc, linux-watchdog, linux-kernel

On 3/29/20 7:55 PM, Chris Packham wrote:
> The DS1388 variant has watchdog timer capabilities. When using a DS1388
> and having enabled CONFIG_WATCHDOG_CORE register a watchdog device for
> the DS1388.
> 
> Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>

Reviewed-by: Guenter Roeck <linux@roeck-us.net>

> ---
> Changes in v3:
> - Address review comments from Guenter. Add select WATCHDOG_CORE, remove
>   unnecessary wdt member, add set_timeout op, use devm_watchdog_register
> Changes in v2:
> - Address review comments from Alexandre, the only functional change is setting
>   the hundredths of seconds to 0 instead of 99.
> 
>  drivers/rtc/Kconfig      |   1 +
>  drivers/rtc/rtc-ds1307.c | 115 +++++++++++++++++++++++++++++++++++++++
>  2 files changed, 116 insertions(+)
> 
> diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
> index 34c8b6c7e095..729851a38511 100644
> --- a/drivers/rtc/Kconfig
> +++ b/drivers/rtc/Kconfig
> @@ -241,6 +241,7 @@ config RTC_DRV_AS3722
>  config RTC_DRV_DS1307
>  	tristate "Dallas/Maxim DS1307/37/38/39/40/41, ST M41T00, EPSON RX-8025, ISL12057"
>  	select REGMAP_I2C
> +	select WATCHDOG_CORE if WATCHDOG
>  	help
>  	  If you say yes here you get support for various compatible RTC
>  	  chips (often with battery backup) connected with I2C. This driver
> diff --git a/drivers/rtc/rtc-ds1307.c b/drivers/rtc/rtc-ds1307.c
> index 31a38d468378..fad042118862 100644
> --- a/drivers/rtc/rtc-ds1307.c
> +++ b/drivers/rtc/rtc-ds1307.c
> @@ -22,6 +22,7 @@
>  #include <linux/hwmon-sysfs.h>
>  #include <linux/clk-provider.h>
>  #include <linux/regmap.h>
> +#include <linux/watchdog.h>
>  
>  /*
>   * We can't determine type by probing, but if we expect pre-Linux code
> @@ -144,8 +145,15 @@ enum ds_type {
>  #	define M41TXX_BIT_CALIB_SIGN	BIT(5)
>  #	define M41TXX_M_CALIBRATION	GENMASK(4, 0)
>  
> +#define DS1388_REG_WDOG_HUN_SECS	0x08
> +#define DS1388_REG_WDOG_SECS		0x09
>  #define DS1388_REG_FLAG			0x0b
> +#	define DS1388_BIT_WF		BIT(6)
>  #	define DS1388_BIT_OSF		BIT(7)
> +#define DS1388_REG_CONTROL		0x0c
> +#	define DS1388_BIT_RST		BIT(0)
> +#	define DS1388_BIT_WDE		BIT(1)
> +
>  /* negative offset step is -2.034ppm */
>  #define M41TXX_NEG_OFFSET_STEP_PPB	2034
>  /* positive offset step is +4.068ppm */
> @@ -854,6 +862,72 @@ static int m41txx_rtc_set_offset(struct device *dev, long offset)
>  				  ctrl_reg);
>  }
>  
> +#ifdef CONFIG_WATCHDOG_CORE
> +static int ds1388_wdt_start(struct watchdog_device *wdt_dev)
> +{
> +	struct ds1307 *ds1307 = watchdog_get_drvdata(wdt_dev);
> +	u8 regs[2];
> +	int ret;
> +
> +	ret = regmap_update_bits(ds1307->regmap, DS1388_REG_FLAG,
> +				 DS1388_BIT_WF, 0);
> +	if (ret)
> +		return ret;
> +
> +	ret = regmap_update_bits(ds1307->regmap, DS1388_REG_CONTROL,
> +				 DS1388_BIT_WDE | DS1388_BIT_RST, 0);
> +	if (ret)
> +		return ret;
> +
> +	/*
> +	 * watchdog timeouts are measured in seconds. So ignore hundredths of
> +	 * seconds field.
> +	 */
> +	regs[0] = 0;
> +	regs[1] = bin2bcd(wdt_dev->timeout);
> +
> +	ret = regmap_bulk_write(ds1307->regmap, DS1388_REG_WDOG_HUN_SECS, regs,
> +				sizeof(regs));
> +	if (ret)
> +		return ret;
> +
> +	return regmap_update_bits(ds1307->regmap, DS1388_REG_CONTROL,
> +				  DS1388_BIT_WDE | DS1388_BIT_RST,
> +				  DS1388_BIT_WDE | DS1388_BIT_RST);
> +}
> +
> +static int ds1388_wdt_stop(struct watchdog_device *wdt_dev)
> +{
> +	struct ds1307 *ds1307 = watchdog_get_drvdata(wdt_dev);
> +
> +	return regmap_update_bits(ds1307->regmap, DS1388_REG_CONTROL,
> +				  DS1388_BIT_WDE | DS1388_BIT_RST, 0);
> +}
> +
> +static int ds1388_wdt_ping(struct watchdog_device *wdt_dev)
> +{
> +	struct ds1307 *ds1307 = watchdog_get_drvdata(wdt_dev);
> +	u8 regs[2];
> +
> +	return regmap_bulk_read(ds1307->regmap, DS1388_REG_WDOG_HUN_SECS, regs,
> +				sizeof(regs));
> +}
> +
> +static int ds1388_wdt_set_timeout(struct watchdog_device *wdt_dev,
> +				  unsigned int val)
> +{
> +	struct ds1307 *ds1307 = watchdog_get_drvdata(wdt_dev);
> +	u8 regs[2];
> +
> +	wdt_dev->timeout = val;
> +	regs[0] = 0;
> +	regs[1] = bin2bcd(wdt_dev->timeout);
> +
> +	return regmap_bulk_write(ds1307->regmap, DS1388_REG_WDOG_HUN_SECS, regs,
> +				 sizeof(regs));
> +}
> +#endif
> +
>  static const struct rtc_class_ops rx8130_rtc_ops = {
>  	.read_time      = ds1307_get_time,
>  	.set_time       = ds1307_set_time,
> @@ -1576,6 +1650,46 @@ static void ds1307_clks_register(struct ds1307 *ds1307)
>  
>  #endif /* CONFIG_COMMON_CLK */
>  
> +#ifdef CONFIG_WATCHDOG_CORE
> +static const struct watchdog_info ds1388_wdt_info = {
> +	.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
> +	.identity = "DS1388 watchdog",
> +};
> +
> +static const struct watchdog_ops ds1388_wdt_ops = {
> +	.owner = THIS_MODULE,
> +	.start = ds1388_wdt_start,
> +	.stop = ds1388_wdt_stop,
> +	.ping = ds1388_wdt_ping,
> +	.set_timeout = ds1388_wdt_set_timeout,
> +
> +};
> +
> +static void ds1307_wdt_register(struct ds1307 *ds1307)
> +{
> +	struct watchdog_device	*wdt;
> +
> +	if (ds1307->type != ds_1388)
> +		return;
> +
> +	wdt = devm_kzalloc(ds1307->dev, sizeof(*wdt), GFP_KERNEL);
> +
> +	wdt->info = &ds1388_wdt_info;
> +	wdt->ops = &ds1388_wdt_ops;
> +	wdt->timeout = 99;
> +	wdt->max_timeout = 99;
> +	wdt->min_timeout = 1;
> +
> +	watchdog_init_timeout(wdt, 0, ds1307->dev);
> +	watchdog_set_drvdata(wdt, ds1307);
> +	devm_watchdog_register_device(ds1307->dev, wdt);
> +}
> +#else
> +static void ds1307_wdt_register(struct ds1307 *ds1307)
> +{
> +}
> +#endif /* CONFIG_WATCHDOG_CORE */
> +
>  static const struct regmap_config regmap_config = {
>  	.reg_bits = 8,
>  	.val_bits = 8,
> @@ -1865,6 +1979,7 @@ static int ds1307_probe(struct i2c_client *client,
>  
>  	ds1307_hwmon_register(ds1307);
>  	ds1307_clks_register(ds1307);
> +	ds1307_wdt_register(ds1307);
>  
>  	return 0;
>  
> 


^ permalink raw reply	[flat|nested] 3+ messages in thread

* Re: [PATCH v3] rtc: ds1307: add support for watchdog timer on ds1388
  2020-03-30  2:55 [PATCH v3] rtc: ds1307: add support for watchdog timer on ds1388 Chris Packham
  2020-03-30 15:33 ` Guenter Roeck
@ 2020-03-30 18:39 ` Alexandre Belloni
  1 sibling, 0 replies; 3+ messages in thread
From: Alexandre Belloni @ 2020-03-30 18:39 UTC (permalink / raw)
  To: Chris Packham
  Cc: a.zummo, wim, linux, linux-rtc, linux-watchdog, linux-kernel

On 30/03/2020 15:55:00+1300, Chris Packham wrote:
> The DS1388 variant has watchdog timer capabilities. When using a DS1388
> and having enabled CONFIG_WATCHDOG_CORE register a watchdog device for
> the DS1388.
> 
> Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
> ---
> Changes in v3:
> - Address review comments from Guenter. Add select WATCHDOG_CORE, remove
>   unnecessary wdt member, add set_timeout op, use devm_watchdog_register
> Changes in v2:
> - Address review comments from Alexandre, the only functional change is setting
>   the hundredths of seconds to 0 instead of 99.
> 
>  drivers/rtc/Kconfig      |   1 +
>  drivers/rtc/rtc-ds1307.c | 115 +++++++++++++++++++++++++++++++++++++++
>  2 files changed, 116 insertions(+)
> 
Applied, thanks.

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

^ permalink raw reply	[flat|nested] 3+ messages in thread

end of thread, other threads:[~2020-03-30 18:39 UTC | newest]

Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2020-03-30  2:55 [PATCH v3] rtc: ds1307: add support for watchdog timer on ds1388 Chris Packham
2020-03-30 15:33 ` Guenter Roeck
2020-03-30 18:39 ` Alexandre Belloni

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