linux-kernel - Re: [RFC PATCH] can: m_can: Add driver for M

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Message-ID: <20220407130118.hp5szzhg4v6szmbq@pengutronix.de>
Date:   Thu, 7 Apr 2022 15:01:18 +0200
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Thierry Reding <thierry.reding@...il.com>
Cc:     Brian Silverman <bsilver16384@...il.com>,
        Brian Silverman <brian.silverman@...erivertech.com>,
        Wolfgang Grandegger <wg@...ndegger.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Dan Murphy <dmurphy@...com>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:CAN NETWORK DRIVERS" <linux-can@...r.kernel.org>,
        "open list:NETWORKING DRIVERS" <netdev@...r.kernel.org>,
        "open list:TEGRA ARCHITECTURE SUPPORT" <linux-tegra@...r.kernel.org>
Subject: Re: [RFC PATCH] can: m_can: Add driver for M_CAN hardware in NVIDIA
 devices

On 06.04.2022 17:18:18, Thierry Reding wrote:
> On Wed, Jan 05, 2022 at 04:25:09PM -0800, Brian Silverman wrote:
> > It's a M_TTCAN with some NVIDIA-specific glue logic and clocks. The
> > existing m_can driver works with it after handling the glue logic.
> > 
> > The code is a combination of pieces from m_can_platform and NVIDIA's
> > driver [1].
> > 
> > [1] https://github.com/hartkopp/nvidia-t18x-can/blob/master/r32.2.1/nvidia/drivers/net/can/mttcan/hal/m_ttcan.c
> > 
> > Signed-off-by: Brian Silverman <brian.silverman@...erivertech.com>
> > ---
> > I ran into bugs with the error handling in NVIDIA's m_ttcan driver, so I
> > switched to m_can which has been much better. I'm looking for feedback
> > on whether I should ensure rebasing hasn't broken anything, write up DT
> > documentation, and submit this patch for real. The driver works great,
> > but I've got some questions about submitting it.
> > 
> > question: This has liberal copying of GPL code from NVIDIA's
> > non-upstreamed m_ttcan driver. Is that OK?
> > 
> > corollary: I don't know what any of this glue logic does. I do know the
> > device doesn't work without it. I can't find any documentation of what
> > these addresses do.
> > 
> > question: There is some duplication between this and m_can_platform. It
> > doesn't seem too bad to me, but is this the preferred way to do it or is
> > there another alternative?
> > 
> > question: Do new DT bindings need to be in the YAML format, or is the
> > .txt one OK?
> > 
> >  drivers/net/can/m_can/Kconfig       |  10 +
> >  drivers/net/can/m_can/Makefile      |   1 +
> >  drivers/net/can/m_can/m_can_tegra.c | 362 ++++++++++++++++++++++++++++
> >  3 files changed, 373 insertions(+)
> >  create mode 100644 drivers/net/can/m_can/m_can_tegra.c
> 
> Sorry for the late reply, I completely missed this.

Brian Silverman left the company bluerivertech, I think there'll be no
progress on the tegra glue code. :/

Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde           |
Embedded Linux                   | https://www.pengutronix.de  |
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