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The CPLD resides on a secondary I2C bus controlled by the embedded MicroBlaze. To allow programming, the driver must take ownership of this bus and expose it to userspace. Add support to: - enable the i2c-dev interface to expose /dev/i2c-N - provide sysfs control over the secondary I2C bus Signed-off-by: Sagi Maimon --- Address comments from: - Andrew Lunn: https://www.spinics.net/lists/netdev/msg1200997.html Changes since v1: - Add reasoning to the commit message drivers/ptp/ptp_ocp.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/drivers/ptp/ptp_ocp.c b/drivers/ptp/ptp_ocp.c index 35e911f1ad78..1b4ccb4feca5 100644 --- a/drivers/ptp/ptp_ocp.c +++ b/drivers/ptp/ptp_ocp.c @@ -4224,6 +4224,34 @@ static const struct ocp_attr_group art_timecard_groups[] = { { }, }; +static ssize_t +i2c_bus_ctrl_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct ptp_ocp *bp = dev_get_drvdata(dev); + + if (!bp->pps_select) + return -ENODEV; + return sysfs_emit(buf, "0x%08x\n", + ioread32(&bp->pps_select->__pad1)); +} + +static ssize_t +i2c_bus_ctrl_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct ptp_ocp *bp = dev_get_drvdata(dev); + u32 val; + + if (!bp->pps_select) + return -ENODEV; + if (kstrtou32(buf, 0, &val)) + return -EINVAL; + iowrite32(val, &bp->pps_select->__pad1); + return count; +} + +static DEVICE_ATTR_RW(i2c_bus_ctrl); + static struct attribute *adva_timecard_attrs[] = { &dev_attr_serialnum.attr, &dev_attr_gnss_sync.attr, @@ -4272,6 +4300,7 @@ static struct attribute *adva_timecard_x1_attrs[] = { &dev_attr_ts_window_adjust.attr, &dev_attr_utc_tai_offset.attr, &dev_attr_tod_correction.attr, + &dev_attr_i2c_bus_ctrl.attr, NULL, }; @@ -5235,6 +5264,7 @@ ptp_ocp_init(void) const char *what; int err; + request_module("i2c-dev"); ptp_ocp_debugfs_init(); what = "timecard class"; -- 2.47.0