linux-kernel - Re: [PATCH 0/5] can: enable multi-queue for SocketCAN devices

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Message-ID: <b7f078ad43104de9bf2e7dbbe6a2a463@de.bosch.com>
Date:   Thu, 7 Jun 2018 15:14:15 +0000
From:   "Jonas Mark (BT-FIR/ENG1)" <Mark.Jonas@...bosch.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
CC:     Wolfgang Grandegger <wg@...ndegger.com>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        "linux-can@...r.kernel.org" <linux-can@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>,
        "Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
        Heiko Schocher <hs@...x.de>,
        "ZHU Yi (BT-FIR/ENG1-Zhu)" <Yi.Zhu5@...bosch.com>
Subject: Re: [PATCH 0/5] can: enable multi-queue for SocketCAN devices

Hi Andy,

> > The functionality bases on an external peripheral chip named Companion.
> > It offers two CAN interfaces, each has 8 prioritized transmit FIFOs as
> > well as one receive FIFO. Besides CAN, undisclosed additional functions
> > can be accessed through the char device.
> >
> > A standard SPI interface with two additional lines for flow control is
> > used. The Companion chip is the SPI slave.
> 
> Can remoteproc API be utilized here?

So far I wasn't aware of the remoteproc API. It appears to me that is
limited to power on/off and loading firmware in an AMP scenario. Here,
the Companion has a fixed firmware in it. It must already be running
quickly after power-up, even before the boot loader.

Does remoteproc also contain a communication framework?

Do you mean rpmsg? Here, I do not see how we could benefit from it.

Can you point me to an example where rpmsg is used over SPI?

Greetings,
Mark

Building Technologies, Panel Software Fire (BT-FIR/ENG1) 
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