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SubjectRe: [PATCH v1 2/2] rtc: ds1307: add support for watchdog timer on ds1388
Hi,

On 07/02/2020 16:18:12+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.
>

As this is a watchdog related patch, you should copy the watchdog
maintainers too.

> +#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);

This is not properly aligned.

> + if (ret)
> + return ret;
> +
> + ret = regmap_update_bits(ds1307->regmap, DS1388_REG_CONTROL,
> + DS1388_BIT_WDE|DS1388_BIT_RST, 0);
spaces around the '|' please

> + if (ret)
> + return ret;
> +
> + /*
> + * watchdog timeouts are measured in seconds so max out hundreths of
> + * seconds field.
> + */
> + regs[0] = 0x99;

Doesn't that give an extra second to the timeout?

> + regs[1] = bin2bcd(wdt_dev->timeout);
> +
> + ret = regmap_bulk_write(ds1307->regmap, DS1388_REG_WDOG_HUN_SECS, regs,
> + sizeof(regs));

This is not properly aligned

> + 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);

spaces around the '|'

> +}
> +
> +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);

ditto

> +}
> +
> +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));
> +}
> +#endif
> +
> static const struct rtc_class_ops rx8130_rtc_ops = {
> .read_time = ds1307_get_time,
> .set_time = ds1307_set_time,
> @@ -880,6 +943,20 @@ static const struct rtc_class_ops m41txx_rtc_ops = {
> .set_offset = m41txx_rtc_set_offset,
> };
>
> +#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,
> +};

Both those structs should be move just before ds1307_wdt_register to
avoid the #ifdef duplication

> +#endif
> +
> static const struct chip_desc chips[last_ds_type] = {
> [ds_1307] = {
> .nvram_offset = 8,
> @@ -1576,6 +1653,33 @@ static void ds1307_clks_register(struct ds1307 *ds1307)
>
> #endif /* CONFIG_COMMON_CLK */
>
> +#ifdef CONFIG_WATCHDOG_CORE
> +static void ds1307_wdt_register(struct ds1307 *ds1307)
> +{
> + int ret;
> +
> + if (ds1307->type != ds_1388)
> + return;
> +
> + ds1307->wdt.info = &ds1388_wdt_info;
> + ds1307->wdt.ops = &ds1388_wdt_ops;
> + ds1307->wdt.max_timeout = 99;
> + ds1307->wdt.min_timeout = 1;
> +
> + watchdog_init_timeout(&ds1307->wdt, 99, ds1307->dev);
> + watchdog_set_drvdata(&ds1307->wdt, ds1307);
> + ret = watchdog_register_device(&ds1307->wdt);
> + if (ret) {
> + dev_warn(ds1307->dev, "unable to register watchdog device %d\n",
> + ret);

There is already a message in case of failure in
watchdog_register_device. Is it really necessary to have a second one?

> + }
> +}
> +#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 +1969,7 @@ static int ds1307_probe(struct i2c_client *client,
>
> ds1307_hwmon_register(ds1307);
> ds1307_clks_register(ds1307);
> + ds1307_wdt_register(ds1307);
>
> return 0;
>
> --
> 2.25.0
>

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

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