linux-kernel - Re: [PATCH] arm64: dts: Added syscon-reboot node for FSL's LS2085A SoC

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Date:	Tue, 27 Oct 2015 16:34:41 +0000
From:	Mark Rutland <mark.rutland@....com>
To:	"J. German Rivera" <German.Rivera@...escale.com>
Cc:	robh+dt@...nel.org, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	bhupesh.sharma@...escale.com, stuart.yoder@...escale.com,
	leoli@...escale.com
Subject: Re: [PATCH] arm64: dts: Added syscon-reboot node for FSL's LS2085A
 SoC

On Fri, Oct 23, 2015 at 08:31:20PM -0500, J. German Rivera wrote:
> Added sys-reboot node to the FSL's LS2085A SoC DT to leverage
> the ARM-generic reboot mechanism for this SoC. This mechanism
> is enabled through CONFIG_POWER_RESET_SYSCON.

Per the comments in arch/arm64/boot/dts/freescale/fsl-ls2085a.dtsi, the
platform has PSCI 0.2+, and therefore already has system reset
functionality.

Given that, why is this necessary?

Thanks,
Mark.

> Signed-off-by: J. German Rivera <German.Rivera@...escale.com>
> ---
>  arch/arm64/boot/dts/freescale/fsl-ls2085a.dtsi | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/freescale/fsl-ls2085a.dtsi b/arch/arm64/boot/dts/freescale/fsl-ls2085a.dtsi
> index e281ceb..6f82163 100644
> --- a/arch/arm64/boot/dts/freescale/fsl-ls2085a.dtsi
> +++ b/arch/arm64/boot/dts/freescale/fsl-ls2085a.dtsi
> @@ -131,6 +131,18 @@
>  		interrupts = <1 9 0x4>;
>  	};
>  
> +	rst_ccsr: rstccsr@...0000 {
> +	        compatible = "syscon";
> +		reg = <0x0 0x1E60000 0x0 0x10000>;
> +	};
> +
> +	reboot@...24000 {
> +		compatible ="syscon-reboot";
> +		regmap = <&rst_ccsr>;
> +		offset = <0x0>;
> +		mask = <0x2>;
> +	};
> +
>  	timer {
>  		compatible = "arm,armv8-timer";
>  		interrupts = <1 13 0x8>, /* Physical Secure PPI, active-low */
> -- 
> 2.3.3
> 
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