netdev - Re: [PATCH v5 1/2] can: rcar_canfd: Add Renesas R-Car CAN FD driver

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Date:	Tue, 3 May 2016 11:47:28 -0500
From:	Rob Herring <robh@...nel.org>
To:	Ramesh Shanmugasundaram <ramesh.shanmugasundaram@...renesas.com>
Cc:	mkl@...gutronix.de, wg@...ndegger.com, socketcan@...tkopp.net,
	pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
	linux-renesas-soc@...r.kernel.org, devicetree@...r.kernel.org,
	linux-can@...r.kernel.org, netdev@...r.kernel.org,
	chris.paterson2@...esas.com
Subject: Re: [PATCH v5 1/2] can: rcar_canfd: Add Renesas R-Car CAN FD driver

On Thu, Apr 28, 2016 at 01:23:07PM +0100, 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@...renesas.com>
> ---
>  .../devicetree/bindings/net/can/rcar_canfd.txt     |   89 ++

What happened to my ack?

>  drivers/net/can/Kconfig                            |    1 +
>  drivers/net/can/Makefile                           |    1 +
>  drivers/net/can/rcar/Kconfig                       |   11 +
>  drivers/net/can/rcar/Makefile                      |    5 +
>  drivers/net/can/rcar/rcar_canfd.c                  | 1624 ++++++++++++++++++++
>  6 files changed, 1731 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/net/can/rcar_canfd.txt
>  create mode 100644 drivers/net/can/rcar/Kconfig
>  create mode 100644 drivers/net/can/rcar/Makefile
>  create mode 100644 drivers/net/can/rcar/rcar_canfd.c