From mboxrd@z Thu Jan  1 00:00:00 1970
From: Qianyu Gong <qianyu.gong@nxp.com>
Date: Fri, 11 Mar 2016 10:32:54 +0000
Subject: [U-Boot] [PATCH] armv8/fsl-layerscape: add IFC fixup for
	LS1043A	with QSPI enabled
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Hi Prabhakar,

> -----Original Message-----
> From: Prabhakar Kushwaha
> Sent: Monday, February 22, 2016 7:51 PM
> To: Qianyu Gong <qianyu.gong@nxp.com>; u-boot at lists.denx.de; york sun
> <york.sun@nxp.com>; oss at buserror.net
> Cc: Qianyu Gong <qianyu.gong@nxp.com>; Mingkai Hu <mingkai.hu@nxp.com>
> Subject: RE: [U-Boot] [PATCH] armv8/fsl-layerscape: add IFC fixup for LS1043A
> with QSPI enabled
> 
> 
> > -----Original Message-----
> > From: U-Boot [mailto:u-boot-bounces at lists.denx.de] On Behalf Of Gong
> > Qianyu
> > Sent: Monday, February 22, 2016 3:35 PM
> > To: u-boot at lists.denx.de; york sun <york.sun@nxp.com>;
> > oss at buserror.net
> > Cc: Qianyu Gong <qianyu.gong@nxp.com>; Mingkai Hu <mingkai.hu@nxp.com>
> > Subject: [U-Boot] [PATCH] armv8/fsl-layerscape: add IFC fixup for
> > LS1043A with QSPI enabled
> >
> > QSPI and IFC are pin-multiplexed on LS1043A. So if QSPI is enabled,
> > IFC should be disabled.
> > But just disable IFC driver in LS1043A Linux is not enough because
> > mdio-mux will access IFC address space -- actually it accesses FPGA
> > which is connected to IFC CS3. So disable the whole IFC node in Linux device tree.
> >
> 
> FPGA and NAND access are valid use-case during QSPI boot
> 
> So why IFC controller is being disabled from device tree.
> 

As Mingkai explained, neither FGPA nor NAND is valid when QSPI is enabled on LS1043AQDS.

> > Signed-off-by: Gong Qianyu <Qianyu.Gong@nxp.com>
> >
> > diff --git a/arch/arm/cpu/armv8/fsl-layerscape/fdt.c
> > b/arch/arm/cpu/armv8/fsl-layerscape/fdt.c
> > index 4e4861d..5bb3048 100644
> > --- a/arch/arm/cpu/armv8/fsl-layerscape/fdt.c
> > +++ b/arch/arm/cpu/armv8/fsl-layerscape/fdt.c
> > @@ -204,4 +204,11 @@ void ft_cpu_setup(void *blob, bd_t *bd)  #ifdef
> > CONFIG_FSL_LSCH3
> >  	fdt_fixup_smmu(blob);
> >  #endif
> > +
> > +#ifdef CONFIG_LS1043A
> 
> I will suggest to avoid SoC specific defines
> 
> --prabhakar

I think only LS1043A needs this fixup for the moment.
So if there's any change on new chips, it wouldn't affect them.


Regards,
Qianyu