From: Giulio Benetti <giulio.benetti@micronovasrl.com>
To: Alexandre Belloni <alexandre.belloni@bootlin.com>
Cc: Giulio Benetti <giulio.benetti@micronovasrl.com>,
Alessandro Zummo <a.zummo@towertech.it>,
linux-rtc@vger.kernel.org (open list:REAL TIME CLOCK (RTC)
SUBSYSTEM), linux-kernel@vger.kernel.org (open list)
Subject: [PATCH v10 3/4] rtc: ds1307: add offset sysfs for mt41txx chips.
Date: Wed, 18 Jul 2018 16:09:44 +0200 [thread overview]
Message-ID: <20180718140946.115093-2-giulio.benetti@micronovasrl.com> (raw)
In-Reply-To: <20180718140946.115093-1-giulio.benetti@micronovasrl.com>
m41txx chips can hold a calibration value to get correct clock bias.
Add offset handling (ranging between -63ppm and 126ppm) via sysfs.
Signed-off-by: Giulio Benetti <giulio.benetti@micronovasrl.com>
---
drivers/rtc/rtc-ds1307.c | 77 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 77 insertions(+)
diff --git a/drivers/rtc/rtc-ds1307.c b/drivers/rtc/rtc-ds1307.c
index 0162a600ff1b..c6d871456f25 100644
--- a/drivers/rtc/rtc-ds1307.c
+++ b/drivers/rtc/rtc-ds1307.c
@@ -114,6 +114,20 @@ enum ds_type {
# define RX8025_BIT_VDET 0x40
# define RX8025_BIT_XST 0x20
+#define M41TXX_REG_CONTROL 0x07
+# define M41TXX_BIT_OUT BIT(7)
+# define M41TXX_BIT_FT BIT(6)
+# define M41TXX_BIT_CALIB_SIGN BIT(5)
+# define M41TXX_M_CALIBRATION GENMASK(4, 0)
+
+/* negative offset step is -2.034ppm */
+#define M41TXX_NEG_OFFSET_STEP_PPB 2034
+/* positive offset step is +4.068ppm */
+#define M41TXX_POS_OFFSET_STEP_PPB 4068
+/* Min and max values supported with 'offset' interface by M41TXX */
+#define M41TXX_MIN_OFFSET ((-31) * M41TXX_NEG_OFFSET_STEP_PPB)
+#define M41TXX_MAX_OFFSET ((31) * M41TXX_POS_OFFSET_STEP_PPB)
+
struct ds1307 {
enum ds_type type;
unsigned long flags;
@@ -146,6 +160,9 @@ struct chip_desc {
static int ds1307_get_time(struct device *dev, struct rtc_time *t);
static int ds1307_set_time(struct device *dev, struct rtc_time *t);
+static int ds1337_read_alarm(struct device *dev, struct rtc_wkalrm *t);
+static int ds1337_set_alarm(struct device *dev, struct rtc_wkalrm *t);
+static int ds1307_alarm_irq_enable(struct device *dev, unsigned int enabled);
static u8 do_trickle_setup_ds1339(struct ds1307 *, u32 ohms, bool diode);
static irqreturn_t rx8130_irq(int irq, void *dev_id);
static int rx8130_read_alarm(struct device *dev, struct rtc_wkalrm *t);
@@ -155,6 +172,8 @@ static irqreturn_t mcp794xx_irq(int irq, void *dev_id);
static int mcp794xx_read_alarm(struct device *dev, struct rtc_wkalrm *t);
static int mcp794xx_set_alarm(struct device *dev, struct rtc_wkalrm *t);
static int mcp794xx_alarm_irq_enable(struct device *dev, unsigned int enabled);
+static int m41txx_rtc_read_offset(struct device *dev, long *offset);
+static int m41txx_rtc_set_offset(struct device *dev, long offset);
static const struct rtc_class_ops rx8130_rtc_ops = {
.read_time = ds1307_get_time,
@@ -172,6 +191,16 @@ static const struct rtc_class_ops mcp794xx_rtc_ops = {
.alarm_irq_enable = mcp794xx_alarm_irq_enable,
};
+static const struct rtc_class_ops m41txx_rtc_ops = {
+ .read_time = ds1307_get_time,
+ .set_time = ds1307_set_time,
+ .read_alarm = ds1337_read_alarm,
+ .set_alarm = ds1337_set_alarm,
+ .alarm_irq_enable = ds1307_alarm_irq_enable,
+ .read_offset = m41txx_rtc_read_offset,
+ .set_offset = m41txx_rtc_set_offset,
+};
+
static const struct chip_desc chips[last_ds_type] = {
[ds_1307] = {
.nvram_offset = 8,
@@ -228,10 +257,17 @@ static const struct chip_desc chips[last_ds_type] = {
.irq_handler = rx8130_irq,
.rtc_ops = &rx8130_rtc_ops,
},
+ [m41t0] = {
+ .rtc_ops = &m41txx_rtc_ops,
+ },
+ [m41t00] = {
+ .rtc_ops = &m41txx_rtc_ops,
+ },
[m41t11] = {
/* this is battery backed SRAM */
.nvram_offset = 8,
.nvram_size = 56,
+ .rtc_ops = &m41txx_rtc_ops,
},
[mcp794xx] = {
.alarm = 1,
@@ -973,6 +1009,47 @@ static int mcp794xx_alarm_irq_enable(struct device *dev, unsigned int enabled)
enabled ? MCP794XX_BIT_ALM0_EN : 0);
}
+static int m41txx_rtc_read_offset(struct device *dev, long *offset)
+{
+ struct ds1307 *ds1307 = dev_get_drvdata(dev);
+ unsigned int ctrl_reg;
+ u8 val;
+
+ regmap_read(ds1307->regmap, M41TXX_REG_CONTROL, &ctrl_reg);
+
+ val = ctrl_reg & M41TXX_M_CALIBRATION;
+
+ /* check if positive */
+ if (ctrl_reg & M41TXX_BIT_CALIB_SIGN)
+ *offset = (val * M41TXX_POS_OFFSET_STEP_PPB);
+ else
+ *offset = -(val * M41TXX_NEG_OFFSET_STEP_PPB);
+
+ return 0;
+}
+
+static int m41txx_rtc_set_offset(struct device *dev, long offset)
+{
+ struct ds1307 *ds1307 = dev_get_drvdata(dev);
+ unsigned int ctrl_reg;
+
+ if ((offset < M41TXX_MIN_OFFSET) || (offset > M41TXX_MAX_OFFSET))
+ return -ERANGE;
+
+ if (offset >= 0) {
+ ctrl_reg = DIV_ROUND_CLOSEST(offset,
+ M41TXX_POS_OFFSET_STEP_PPB);
+ ctrl_reg |= M41TXX_BIT_CALIB_SIGN;
+ } else {
+ ctrl_reg = DIV_ROUND_CLOSEST(abs(offset),
+ M41TXX_NEG_OFFSET_STEP_PPB);
+ }
+
+ return regmap_update_bits(ds1307->regmap, M41TXX_REG_CONTROL,
+ M41TXX_M_CALIBRATION | M41TXX_BIT_CALIB_SIGN,
+ ctrl_reg);
+}
+
/*----------------------------------------------------------------------*/
static int ds1307_nvram_read(void *priv, unsigned int offset, void *val,
--
2.17.1
next prev parent reply other threads:[~2018-07-18 14:09 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
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 ` Giulio Benetti [this message]
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20180718140946.115093-2-giulio.benetti@micronovasrl.com \
--to=giulio.benetti@micronovasrl.com \
--cc=a.zummo@towertech.it \
--cc=alexandre.belloni@bootlin.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-rtc@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).