From: Andy Shevchenko <andy.shevchenko@gmail.com>
To: Giulio Benetti <giulio.benetti@micronovasrl.com>
Cc: Alexandre Belloni <alexandre.belloni@bootlin.com>,
Alessandro Zummo <a.zummo@towertech.it>,
"open list:REAL TIME CLOCK (RTC) SUBSYSTEM"
<linux-rtc@vger.kernel.org>,
open list <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v9 4/4] rtc: ds1307: add frequency_test_enable sysfs attribute to check tick on m41txx
Date: Wed, 18 Jul 2018 15:47:54 +0300 [thread overview]
Message-ID: <CAHp75VcaALb8fYJExnZ=Ye=GcNHc3aPXgFihVK+rAu_a1A01Sg@mail.gmail.com> (raw)
In-Reply-To: <20180718094006.105675-3-giulio.benetti@micronovasrl.com>
On Wed, Jul 18, 2018 at 12:40 PM, Giulio Benetti
<giulio.benetti@micronovasrl.com> wrote:
> On m41txx you can enable open-drain OUT pin to check if offset is ok.
> Enabling OUT pin with frequency_test_enable attribute, OUT pin will tick
> 512 times faster than 1s tick base.
>
> Enable or Disable FT bit on CONTROL register if freq_test is 1 or 0.
> +static ssize_t frequency_test_enable_store(struct device *dev,
> + struct device_attribute *attr,
> + const char *buf, size_t count)
> +{
> + struct ds1307 *ds1307 = dev_get_drvdata(dev);
> + bool freq_test_en = 0;
First of all, initialization of boolean using int is not very best style.
Second, this is not needed.
> + int ret;
> +
> + ret = kstrtobool(buf, &freq_test_en);
> + if (ret == -EINVAL) {
What kind of other error code you may expect and why they are not
considered as no error?
> + dev_err(dev, "Failed to store RTC Frequency Test attribute\n");
> + return ret;
> + }
> +
> + regmap_update_bits(ds1307->regmap, M41TXX_REG_CONTROL, M41TXX_BIT_FT,
> + freq_test_en ? M41TXX_BIT_FT : 0);
> +
> + return count;
> +}
> +
> +static ssize_t frequency_test_enable_show(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + struct ds1307 *ds1307 = dev_get_drvdata(dev);
> + unsigned int ctrl_reg;
> +
> + regmap_read(ds1307->regmap, M41TXX_REG_CONTROL, &ctrl_reg);
> +
> + if (ctrl_reg & M41TXX_BIT_FT)
> + return scnprintf(buf, PAGE_SIZE, "on\n");
> + else
> + return scnprintf(buf, PAGE_SIZE, "off\n");
Entire condition might be one line.
> +}
> +
> +static int ds1307_add_frequency_test(struct ds1307 *ds1307)
> +{
> + int err = 0;
Redundant assignment. See below.
> +
> + switch (ds1307->type) {
> + case m41t0:
> + case m41t00:
> + case m41t11:
> + /* Export sysfs entries */
> + err = sysfs_create_group(&(ds1307->dev)->kobj,
> + &rtc_freq_test_attr_group);
> + if (err) {
> + dev_err(ds1307->dev,
> + "Failed to create sysfs group: %d\n",
> + err);
> + return err;
> + }
> +
> + err = devm_add_action_or_reset(ds1307->dev,
> + rtc_calib_remove_sysfs_group,
> + ds1307->dev);
> + if (err) {
> + dev_err(ds1307->dev,
> + "Failed to add sysfs cleanup action: %d\n",
> + err);
> + sysfs_remove_group(&(ds1307->dev)->kobj,
> + &rtc_freq_test_attr_group);
> + return err;
> + }
> + break;
> + default:
> + break;
> + }
> +
> + return err;
return 0;
--
With Best Regards,
Andy Shevchenko
next prev parent reply other threads:[~2018-07-18 12:48 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-18 9:40 [PATCH v9 2/4] rtc: ds1307: support m41t11 variant Giulio Benetti
2018-07-18 9:40 ` [PATCH v9 3/4] rtc: ds1307: add offset sysfs for mt41txx chips Giulio Benetti
2018-07-18 9:40 ` [PATCH v9 4/4] rtc: ds1307: add frequency_test_enable sysfs attribute to check tick on m41txx Giulio Benetti
2018-07-18 12:47 ` Andy Shevchenko [this message]
2018-07-18 14:06 ` Giulio Benetti
2018-07-18 16:26 ` Andy Shevchenko
2018-07-19 18:19 ` Giulio Benetti
2018-07-20 12:53 ` Andy Shevchenko
2018-07-20 13:06 ` Giulio Benetti
2018-07-18 14:09 ` [PATCH v10 2/4] rtc: ds1307: support m41t11 variant Giulio Benetti
2018-07-18 14:09 ` [PATCH v10 3/4] rtc: ds1307: add offset sysfs for mt41txx chips Giulio Benetti
2018-07-18 14:09 ` [PATCH v10 4/4] rtc: ds1307: add frequency_test_enable sysfs attribute to check tick on m41txx Giulio Benetti
2018-07-18 14:11 ` Giulio Benetti
2018-07-18 16:26 ` Andy Shevchenko
2018-07-18 17:40 ` Giulio Benetti
2018-07-18 14:09 ` [PATCH v10 1/4] rtc: ds1307: fix data pointer to m41t0 Giulio Benetti
2018-07-20 13:43 ` [PATCH v10 2/4] rtc: ds1307: support m41t11 variant Rob Herring
2018-07-20 13:49 ` Giulio Benetti
2018-07-18 9:40 ` [PATCH v9 1/4] rtc: ds1307: fix data pointer to m41t0 Giulio Benetti
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