linux-kernel - Re: [PATCH 2/2] spi: fsl-spi: Allow dynamic allocation of CPM1 parameter RAM

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Message-ID: <20141003144420.GC24441@sirena.org.uk>
Date:	Fri, 3 Oct 2014 15:44:20 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Christophe Leroy <christophe.leroy@....fr>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Marcelo Tosatti <marcelo@...ck.org>,
	Vitaly Bordug <vitb@...nel.crashing.org>,
	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	linux-spi@...r.kernel.org,
	Joakim Tjernlund <joakim.tjernlund@...nsmode.se>,
	scottwood@...escale.com
Subject: Re: [PATCH 2/2] spi: fsl-spi: Allow dynamic allocation of CPM1
 parameter RAM

On Fri, Oct 03, 2014 at 02:56:09PM +0200, Christophe Leroy wrote:

> +config CPM1_RELOCSPI
> +	bool "Dynamic SPI relocation"
> +	default n
> +	help
> +	  On recent MPC8xx (at least MPC866 and MPC885) SPI can be relocated
> +	  without micropatch. This activates relocation to a dynamically
> +	  allocated area in the CPM Dual port RAM.
> +	  When combined with SPI relocation patch (for older MPC8xx) it avoids
> +	  the "loss" of additional Dual port RAM space just above the patch,
> +	  which might be needed for example when using the CPM QMC.

Something like this shouldn't be a compile time option.  Either it
should be unconditional or it should be triggered in some system
specific manner (from DT, from knowing about other users or similar).

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