linux-kernel - Re: [PATCH V5 Base on RC7 3/3] Add reset controller for hi6220 SoC platform.

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Date:	Wed, 28 Oct 2015 12:42:22 +0100
From:	Philipp Zabel <p.zabel@...gutronix.de>
To:	Chen Feng <puck.chen@...ilicon.com>
Cc:	linux-kernel@...r.kernel.org, robh+dt@...nel.org,
	pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk
Subject: Re: [PATCH V5 Base on RC7 3/3] Add reset controller for hi6220 SoC
 platform.

Am Dienstag, den 27.10.2015, 17:51 +0800 schrieb Chen Feng:
> reset: add driver for hi6220 reset controller
> 
> Signed-off-by: Chen Feng <puck.chen@...ilicon.com>
> ---
>  arch/arm64/boot/dts/hisilicon/hi6220.dtsi | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/hisilicon/hi6220.dtsi b/arch/arm64/boot/dts/hisilicon/hi6220.dtsi
> index 3f03380..3f055e2 100644
> --- a/arch/arm64/boot/dts/hisilicon/hi6220.dtsi
> +++ b/arch/arm64/boot/dts/hisilicon/hi6220.dtsi
> @@ -167,5 +167,12 @@
>  			clocks = <&ao_ctrl 36>, <&ao_ctrl 36>;
>  			clock-names = "uartclk", "apb_pclk";
>  		};
> +
> +		reset_ctrl: reset_ctrl@...30000 {
> +			compatible = "hisilicon,hi6220-reset-ctl";
> +			reg = <0x0 0xf7030000 0x0 0x1000>;
> +			#reset-cells = <1>;
> +		};
> +

While applying I just noticed that the device tree already contains a
node claiming the same address space:

	sys_ctrl: sys_ctrl@...30000 {
		compatible = "hisilicon,hi6220-sysctrl", "syscon";
		reg = <0x0 0xf7030000 0x0 0x2000>;
		#clock-cells = <1>;
	};

It is documented in
Documentation/devicetree/bindings/arm/hisilicon/hisilicon.txt and
Documentation/devicetree/bindings/clock/hi6220-clock.txt.

Could you clarify whether the reset controls are just part of the
sys_ctrl block? If so, I think you should add #reset-cells = <1> to the
sys_ctrl node instead.

regards
Philipp

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