Re: [PATCH 2/5] ARM: dts: sun4i: Add A10 SRAM and SRAM controller

[Maxime Ripard <maxime.ripard-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>]

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On Fri, Mar 20, 2015 at 07:52:46PM +0100, Hans de Goede wrote:
> The A10 has a few SRAM that can be mapped either to a device or to the CPU,
> with the mapping being controlled by a SRAM controller.
> 
> Since most of the time these SRAM won't be accessible by the CPU,
> we can't use the mmio-sram driver and compatible.
> 
> Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
> ---
>  arch/arm/boot/dts/sun4i-a10.dtsi | 34 ++++++++++++++++++++++++++++++++++
>  1 file changed, 34 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/sun4i-a10.dtsi b/arch/arm/boot/dts/sun4i-a10.dtsi
> index b66ebb3..88f57b4 100644
> --- a/arch/arm/boot/dts/sun4i-a10.dtsi
> +++ b/arch/arm/boot/dts/sun4i-a10.dtsi
> @@ -451,12 +451,46 @@
>  		};
>  	};
>  
> +	/*
> +	 * Note we use the address were mmio registers start, not where the
                                   ^ where

> +	 * SRAM blocks start, this cannot be changed because that would be
> +	 * a devicetree ABI change.
> +	 */
>  	soc@01c00000 {
>  		compatible = "simple-bus";
>  		#address-cells = <1>;
>  		#size-cells = <1>;
>  		ranges;
>  
> +		sram@00000000 {
> +			compatible = "allwinner,sun4i-a10-sram";
> +			reg = <0x00000000 0x4000>;
> +			allwinner,sram-name = "A1";
> +		};
> +
> +		sram@00004000 {
> +			compatible = "allwinner,sun4i-a10-sram";
> +			reg = <0x00004000 0x4000>;
> +			allwinner,sram-name = "A2";
> +		};
> +
> +		sram@00008000 {
> +			compatible = "allwinner,sun4i-a10-sram";
> +			reg = <0x00008000 0x4000>;
> +			allwinner,sram-name = "A3-A4";
> +		};
> +
> +		sram@00010000 {
> +			compatible = "allwinner,sun4i-a10-sram";
> +			reg = <0x00010000 0x1000>;
> +			allwinner,sram-name = "D";
> +		};
> +
> +		sram-controller@01c00000 {
> +			compatible = "allwinner,sun4i-a10-sram-controller";
> +			reg = <0x01c00000 0x30>;
> +		};
> +
>  		dma: dma-controller@01c02000 {
>  			compatible = "allwinner,sun4i-a10-dma";
>  			reg = <0x01c02000 0x1000>;
> -- 
> 2.3.3
> 

-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com