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| author | Vadim Fedorenko <vadfed@fb.com> | 2022-03-02 13:34:56 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2022-03-03 14:42:46 +0000 |
| commit | 2f23f486cf626a9a2ea70da0dac93c63e89f6595 (patch) | |
| tree | d99afcf886bedf1d40ab4ebae2d0450a8869ce86 /drivers/ptp/ptp_ocp.c | |
| parent | 9f492c4cb2351c43e5ea64285e729a21392950df (diff) | |
| download | lwn-2f23f486cf626a9a2ea70da0dac93c63e89f6595.tar.gz lwn-2f23f486cf626a9a2ea70da0dac93c63e89f6595.zip | |
ptp: ocp: Expose clock status drift and offset
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>
Diffstat (limited to 'drivers/ptp/ptp_ocp.c')
| -rw-r--r-- | drivers/ptp/ptp_ocp.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/drivers/ptp/ptp_ocp.c b/drivers/ptp/ptp_ocp.c index 5b50a16912b7..e9094dee78a4 100644 --- a/drivers/ptp/ptp_ocp.c +++ b/drivers/ptp/ptp_ocp.c @@ -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, |