netdev - RE: [PATCH linux-can-next/flexcan 3/4] can: flexcan: add CAN wakeup function for i.MX8

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Message-ID: <DB8PR04MB6795E28AB76F9575519AD5ECE6360@DB8PR04MB6795.eurprd04.prod.outlook.com>
Date:   Fri, 25 Sep 2020 09:49:33 +0000
From:   Joakim Zhang <qiangqing.zhang@....com>
To:     Marc Kleine-Budde <mkl@...gutronix.de>,
        "linux-can@...r.kernel.org" <linux-can@...r.kernel.org>
CC:     dl-linux-imx <linux-imx@....com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [PATCH linux-can-next/flexcan 3/4] can: flexcan: add CAN wakeup
 function for i.MX8


> -----Original Message-----
> From: Marc Kleine-Budde <mkl@...gutronix.de>
> Sent: 2020年9月25日 17:44
> To: Joakim Zhang <qiangqing.zhang@....com>; linux-can@...r.kernel.org
> Cc: dl-linux-imx <linux-imx@....com>; netdev@...r.kernel.org
> Subject: Re: [PATCH linux-can-next/flexcan 3/4] can: flexcan: add CAN wakeup
> function for i.MX8
> 
> On 9/25/20 5:10 PM, Joakim Zhang wrote:
> > The System Controller Firmware (SCFW) is a low-level system function
> > which runs on a dedicated Cortex-M core to provide power, clock, and
> > resource management. It exists on some i.MX8 processors. e.g. i.MX8QM
> > (QM, QP), and i.MX8QX (QXP, DX).
> >
> > SCU driver manages the IPC interface between host CPU and the SCU
> > firmware running on M4.
> >
> > For i.MX8, stop mode request is controlled by System Controller
> > Unit(SCU) firmware.
> >
> > Signed-off-by: Joakim Zhang <qiangqing.zhang@....com>
> > ---
> 
> Just for reference, this fails to build with:
> 
> ERROR: modpost: "imx_scu_get_handle" [drivers/net/can/flexcan.ko]
> undefined!
> ERROR: modpost: "imx_sc_misc_set_control" [drivers/net/can/flexcan.ko]
> undefined!

Yes, I build at my side, due to scu symbols have not export on non-scu systems.

Best Regards,
Joakim Zhang
> Marc
> 
> --
> Pengutronix e.K.                 | Marc Kleine-Budde           |
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