Vincent Mailhol 39f66c9e22 can: bittiming: change unit of TDC parameters to clock periods ... In the current implementation, all Transmission Delay Compensation (TDC) parameters are expressed in time quantum. However, ISO 11898-1 actually specifies that these should be expressed in *minimum* time quantum. Furthermore, the minimum time quantum is specified to be "one node clock period long" (c.f. paragraph 11.3.1.1 "Bit time"). For sake of simplicity, we prefer to use the "clock period" term instead of "minimum time quantum" because we believe that it is more broadly understood. This patch fixes that discrepancy by updating the documentation and the formula for TDCO calculation. N.B. In can_calc_tdco(), the sample point (in time quantum) was calculated using a division, thus introducing a risk of rounding and truncation errors. On top of changing the unit to clock period, we also modified the formula to use only additions. Link: https://lore.kernel.org/all/20210918095637.20108-3-mailhol.vincent@wanadoo.fr Suggested-by: Stefan Mätje <Stefan.Maetje@esd.eu> Signed-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>		2021-10-24 16:24:28 +02:00
..
dev	can: remove obsolete get_canfd_dlc() macro	2020-11-20 09:43:30 +01:00
platform	can: flexcan: add platform data header	2021-07-25 11:36:29 +02:00
bittiming.h	can: bittiming: change unit of TDC parameters to clock periods	2021-10-24 16:24:28 +02:00
can-ml.h	net: introduce CAN specific pointer in the struct net_device	2021-02-24 14:32:15 -08:00
core.h	can: remove obsolete version strings	2020-10-12 10:06:39 +02:00
dev.h	can: bittiming: allow TDC{V,O} to be zero and add can_tdc_const::tdc{v,o,f}_min	2021-10-24 16:24:28 +02:00
led.h	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500	2019-06-19 17:09:55 +02:00
length.h	can: length: can_skb_get_frame_len(): introduce function to get data length of frame in data link layer	2021-01-14 08:43:42 +01:00
rx-offload.h	can: rx-offload: can_rx_offload_threaded_irq_finish(): add new function to be called from threaded interrupt	2021-07-25 11:36:25 +02:00
skb.h	can: dev: can_free_echo_skb(): extend to return can frame length	2021-03-30 11:14:28 +02:00