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>

diff --git a/drivers/ptp/ptp_ocp.c b/drivers/ptp/ptp_ocp.c
index 5b50a16912b789c1963319c8fd5142ba8a39cf72..e9094dee78a49b97b87334858f37fbd2039b075c 100644 (file)
--- 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,