On 03/15/2016 10:48 AM, Ramesh Shanmugasundaram wrote: > This patch adds support for the CAN FD controller found in Renesas R-Car > SoCs. The controller operates in CAN FD only mode by default. > > CAN FD mode supports both Classical CAN & CAN FD frame formats. The > controller supports ISO 11898-1:2015 CAN FD format only. > > This controller supports two channels and the driver can enable either > or both of the channels. > > Driver uses Rx FIFOs (one per channel) for reception & Common FIFOs (one > per channel) for transmission. Rx filter rules are configured to the > minimum (one per channel) and it accepts Standard, Extended, Data & > Remote Frame combinations. > > Note: There are few documentation errors in R-Car Gen3 Hardware User > Manual v0.5E with respect to CAN FD controller. They are listed below: > > 1. CAN FD interrupt numbers 29 & 30 are listed as per channel > interrupts. However, they are common to both channels (i.e.) they are > global and channel interrupts respectively. > > 2. CANFD clock is derived from PLL1. This is not documented. > > 3. CANFD clock is further divided by (1/2) within the CAN FD controller. > This is not documented. > > 4. The minimum value of NTSEG1 in RSCFDnCFDCmNCFG register is 2 Tq. It > is specified 4 Tq in the manual. > > 5. The maximum number of message RAM area the controller can use is 3584 > bytes. It is specified 10752 bytes in the manual. > > Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram@xxxxxxxxxxxxxx> > --- > Hi All, > > Thanks for the review comments. > > This updated patch is based on linux-can-next tag (linux-can-next-for-4.6-20160310). > > This patch depends on > > [RFC] [PATCH v3] can: fix handling of unmodifiable configuration options > (http://comments.gmane.org/gmane.linux.can/9126) > > Changes since v2: > * Rebased to latest tag (linux-can-next-for-4.6-20160310) > * Cleaned up leftover debugfs code (Thanks Oliver H) > * Revised devicetree documentation text (as suggested by Rob H) > (https://www.mail-archive.com/linux-renesas-soc@xxxxxxxxxxxxxxx/msg01597.html) > * Used new can subsystem api to set static configuration & removed check in rcar_canfd_start (as suggested by Oliver H) > (Refer: http://comments.gmane.org/gmane.linux.can/9126 & > https://www.mail-archive.com/linux-renesas-soc@xxxxxxxxxxxxxxx/msg01867.html) > * Clubbed Renesas controller drivers to driver/net/can/rcar dir (as suggested by Oliver H) Please make moving of the existing drivers a separate patch. Marc -- Pengutronix e.K. | Marc Kleine-Budde | Industrial Linux Solutions | Phone: +49-231-2826-924 | Vertretung West/Dortmund | Fax: +49-5121-206917-5555 | Amtsgericht Hildesheim, HRA 2686 | http://www.pengutronix.de |
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