> -----Original Message----- > From: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx> > Sent: 2020年9月25日 17:44 > To: Joakim Zhang <qiangqing.zhang@xxxxxxx>; linux-can@xxxxxxxxxxxxxxx > Cc: dl-linux-imx <linux-imx@xxxxxxx>; netdev@xxxxxxxxxxxxxxx > 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@xxxxxxx> > > --- > > 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 | > Embedded Linux | https://www.pengutronix.de | > Vertretung West/Dortmund | Phone: +49-231-2826-924 | > Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
