linux-kernel - Re: [PATCH v3 2/6] misc: sram: add ability to mark sram sections as reserved

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Date:	Fri, 5 Jul 2013 16:23:33 +0200
From:	Heiko Stübner <heiko@...ech.de>
To:	Fabio Estevam <festevam@...il.com>
Cc:	Arnd Bergmann <arnd@...db.de>,
	Russell King <linux@....linux.org.uk>,
	"Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
	devicetree-discuss@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	Grant Likely <grant.likely@...aro.org>,
	Ulrich Prinz <ulrich.prinz@...glemail.com>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Olof Johansson <olof@...om.net>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v3 2/6] misc: sram: add ability to mark sram sections as reserved

Am Freitag, 5. Juli 2013, 14:55:40 schrieb Fabio Estevam:
> On Fri, Jul 5, 2013 at 9:41 AM, Heiko Stübner <heiko@...ech.de> wrote:
> > Some SoCs need parts of their sram for special purposes. So while being
> > part of the periphal, it should not be part of the genpool controlling
> > the sram.
> > 
> > Threfore add an option mmio-sram-reserved to keep arbitary portions of
> > the sram from being part of the pool.
> > 
> > Suggested-by: Rob Herring <robherring2@...il.com>
> > Signed-off-by: Heiko Stuebner <heiko@...ech.de>
> > Tested-by: Ulrich Prinz <ulrich.prinz@...glemail.com>
> > ---
> > 
> >  Documentation/devicetree/bindings/misc/sram.txt |    8 +++
> >  drivers/misc/sram.c                             |   80
> >  +++++++++++++++++++++-- 2 files changed, 82 insertions(+), 6
> >  deletions(-)
> > 
> > diff --git a/Documentation/devicetree/bindings/misc/sram.txt
> > b/Documentation/devicetree/bindings/misc/sram.txt index 4d0a00e..eae080e
> > 100644
> > --- a/Documentation/devicetree/bindings/misc/sram.txt
> > +++ b/Documentation/devicetree/bindings/misc/sram.txt
> > 
> > @@ -8,9 +8,17 @@ Required properties:
> >  - reg : SRAM iomem address range
> > 
> > +Optional properties:
> > +
> > +- mmio-sram-reserved: ordered list of reserved chunks inside the sram
> > that +  should not become part of the genalloc pool.
> > +  Format is <base size>, <base size>, ...; with base being relative to
> > the +  reg property base.
> 
> Isn't it a typo?
> 
> I think you meant:
> Format is <base start>, <reserved size>,

no, the intended format is like

<0x0 0x100>, <0x1000 0x100>, ...

base + size, base + size, and so on


> 
> > +
> > 
> >  Example:
> >  
> >  sram: sram@...00000 {
> >  
> >         compatible = "mmio-sram";
> >         reg = <0x5c000000 0x40000>; /* 256 KiB SRAM at address 0x5c000000
> >         */
> > 
> > +       mmio-sram-reserved = <0x0 0x100>; /* reserve
> > 0x5c000000-0x5c000100 */
>
> > 
> >  };

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