Subject: Re: [PATCH v11 6/6] powerpc: Add flexcan device support for p1010rdb.

From: Robin Holt <holt-sJ/[email-masked]>
Date: Thu, 11 Aug 2011 11:48:13 -0500

On Thu, Aug 11, 2011 at 06:35:08PM +0200, Wolfgang Grandegger wrote:
> On 08/11/2011 06:07 PM, Robin Holt wrote:
> > Allow the p1010 processor to select the flexcan network driver.
> > 
> > Signed-off-by: Robin Holt <holt-sJ/[email-masked]>
> > Acked-by: Marc Kleine-Budde <[email-masked]>,
> > Acked-by: Wolfgang Grandegger <[email-masked]>,
> > Cc: U Bhaskar-B22300 <[email-masked]>
> > Cc: [email-masked],
> > Cc: [email-masked],
> > Cc: PPC list <linuxppc-dev-uLR06cmDAlY/[email-masked]>
> > Cc: Kumar Gala <[email-masked]>
> > ---
> >  arch/powerpc/boot/dts/p1010rdb.dts  |    8 ++++++++
> >  arch/powerpc/platforms/85xx/Kconfig |    2 ++
> >  2 files changed, 10 insertions(+), 0 deletions(-)
> > 
> > diff --git a/arch/powerpc/boot/dts/p1010rdb.dts b/arch/powerpc/boot/dts/p1010rdb.dts
> > index d6c669c..df89b60 100644
> > --- a/arch/powerpc/boot/dts/p1010rdb.dts
> > +++ b/arch/powerpc/boot/dts/p1010rdb.dts
> > @@ -171,6 +171,14 @@
> >  			};
> >  		};
> >  
> > +		can@1c000 {
> > +			clock-frequency = <0x0bebc1fc>;
> > +		};
> 
> 
> 	                clock-frequency = <200000000>; // filled in by boot-loader
> 
> Is better readable and makes clear that the value is filled in by the
> boot loader. Usually we specify "<0>" in that case but it will *not*
> work with your board because U-Boot fills into the property "clock_freq"
> the CCB-frequency, which is twice as much. This needs to be fixed.

I guess the question then is, should I not add the clock-frequency to
this file and let this fall back upon the boot-loader?  Until the boot
loader is up-to-speed, my test .dts file will need to define it.

Thanks,
Robin

> 
> > +		can1: can@1d000 {
> 
> What is the "can1:" good for?
> 
> > +			clock-frequency = <0x0bebc1fc>;
> 
> See above.
> 
> Wolfgang.
> 
> 
> 
> 
> >  		usb@22000 {
> >  			phy_type = "utmi";
> >  		};
> > diff --git a/arch/powerpc/platforms/85xx/Kconfig b/arch/powerpc/platforms/85xx/Kconfig
> > index 498534c..c4304ae 100644
> > --- a/arch/powerpc/platforms/85xx/Kconfig
> > +++ b/arch/powerpc/platforms/85xx/Kconfig
> > @@ -70,6 +70,8 @@ config MPC85xx_RDB
> >  config P1010_RDB
> >  	bool "Freescale P1010RDB"
> >  	select DEFAULT_UIMAGE
> > +	select HAVE_CAN_FLEXCAN if NET && CAN
> > +	select PPC_CLOCK if CAN_FLEXCAN
> >  	help
> >  	  This option enables support for the MPC85xx RDB (P1010 RDB) board
> >