linux-kernel - Re: [PATCH v6 1/6] dt-bindings: sram: describe option to reserve parts of the memory

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Message-ID: <CAL_JsqL1nSzUmbukdE2m0vtFH8TAQSSaeK2ZZDEW76REDE0yug@mail.gmail.com>
Date:	Thu, 16 Jan 2014 08:36:44 -0600
From:	Rob Herring <robherring2@...il.com>
To:	Heiko Stübner <heiko@...ech.de>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"arm@...nel.org" <arm@...nel.org>,
	Grant Likely <grant.likely@...aro.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Stephen Warren <swarren@...dotorg.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>
Subject: Re: [PATCH v6 1/6] dt-bindings: sram: describe option to reserve
 parts of the memory

On Wed, Jan 15, 2014 at 3:40 PM, Heiko Stübner <heiko@...ech.de> wrote:
> Some SoCs need parts of their sram for special purposes. So while being part
> of the peripheral, it should not be part of the genpool controlling the sram.
>
> Therefore add an option mmio-sram-reserved to keep arbitrary portions of the
> sram from general usage.
>
> Suggested-by: Rob Herring <robherring2@...il.com>
> Signed-off-by: Heiko Stuebner <heiko@...ech.de>
> Tested-by: Ulrich Prinz <ulrich.prinz@...glemail.com>

Acked-by: Rob Herring <robh@...nel.org>

> ---
>  Documentation/devicetree/bindings/misc/sram.txt |    8 ++++++++
>  1 file changed, 8 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/misc/sram.txt b/Documentation/devicetree/bindings/misc/sram.txt
> index 4d0a00e..09ee7a3 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 be used by the operating system.
> +  Format is <base size>, <base size>, ...; with base being relative to the
> +  reg property base.
> +
>  Example:
>
>  sram: sram@...00000 {
>         compatible = "mmio-sram";
>         reg = <0x5c000000 0x40000>; /* 256 KiB SRAM at address 0x5c000000 */
> +       mmio-sram-reserved = <0x0 0x100>; /* reserve 0x5c000000-0x5c000100 */
>  };
> --
> 1.7.10.4
>
>
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