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ptp: ocp: Expose clock status drift and offset

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Monitoring of clock variance could be done through checking
the offset and the drift updates that are applied to atomic
clocks.  Expose these values as attributes for the timecard.

Signed-off-by: Vadim Fedorenko <vadfed@fb.com>
Signed-off-by: Jonathan Lemon <jonathan.lemon@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vadim Fedorenko 2022-03-02 13:34:56 -08:00 committed by David S. Miller
parent 9f492c4cb2
commit 2f23f486cf
1 changed files with 34 additions and 0 deletions
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34
drivers/ptp/ptp_ocp.c
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@ -52,6 +52,8 @@ struct ocp_reg {
u32 servo_offset_i;
u32 servo_drift_p;
u32 servo_drift_i;
u32 status_offset;
u32 status_drift;
};
#define OCP_CTRL_ENABLE BIT(0)
@ -1935,6 +1937,36 @@ available_clock_sources_show(struct device *dev,
}
static DEVICE_ATTR_RO(available_clock_sources);
static ssize_t
clock_status_drift_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct ptp_ocp *bp = dev_get_drvdata(dev);
u32 val;
int res;
val = ioread32(&bp->reg->status_drift);
res = (val & ~INT_MAX) ? -1 : 1;
res *= (val & INT_MAX);
return sysfs_emit(buf, "%d\n", res);
}
static DEVICE_ATTR_RO(clock_status_drift);
static ssize_t
clock_status_offset_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct ptp_ocp *bp = dev_get_drvdata(dev);
u32 val;
int res;
val = ioread32(&bp->reg->status_offset);
res = (val & ~INT_MAX) ? -1 : 1;
res *= (val & INT_MAX);
return sysfs_emit(buf, "%d\n", res);
}
static DEVICE_ATTR_RO(clock_status_offset);
static struct attribute *timecard_attrs[] = {
&dev_attr_serialnum.attr,
&dev_attr_gnss_sync.attr,
@ -1946,6 +1978,8 @@ static struct attribute *timecard_attrs[] = {
&dev_attr_sma4.attr,
&dev_attr_available_sma_inputs.attr,
&dev_attr_available_sma_outputs.attr,
&dev_attr_clock_status_drift.attr,
&dev_attr_clock_status_offset.attr,
&dev_attr_irig_b_mode.attr,
&dev_attr_utc_tai_offset.attr,
&dev_attr_ts_window_adjust.attr,