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Currently, userland has no method to query which timestamping features are supported by the peak_canfd driver (aside maybe of getting RX messages and observe whether or not hardware timestamps stay at zero). The canonical way to add hardware timestamp support is to implement ethtool_ops::get_ts_info() in order to advertise the timestamping capabilities and to implement net_device_ops::ndo_eth_ioctl() as requested in [1]. Currently, the driver only supports hardware RX timestamps [2] but not hardware TX. For this reason, the generic function can_ethtool_op_get_ts_info_hwts() and can_eth_ioctl_hwts() can not be reused and instead this patch adds peak_get_ts_info() and peak_eth_ioctl(). [1] kernel doc Timestamping, section 3.1: "Hardware Timestamping Implementation: Device Drivers" Link: https://docs.kernel.org/networking/timestamping.html#hardware-timestamping-implementation-device-drivers [2] https://lore.kernel.org/linux-can/20220727084257.brcbbf7lksoeekbr@pengutronix.de/ CC: Stephane Grosjean <s.grosjean@peak-system.com> Signed-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr> Link: https://lore.kernel.org/all/20220727101641.198847-14-mailhol.vincent@wanadoo.fr Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>