linux-kernel - Re: [PATCH v4 3/3] arm64: dts: reset: add microchip sparx5 switch reset driver

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Message-ID: <20210205223526.GA3869001@robh.at.kernel.org>
Date:   Fri, 5 Feb 2021 16:35:26 -0600
From:   Rob Herring <robh@...nel.org>
To:     Steen Hegelund <steen.hegelund@...rochip.com>
Cc:     Philipp Zabel <p.zabel@...gutronix.de>,
        Andrew Lunn <andrew@...n.ch>,
        Microchip Linux Driver Support <UNGLinuxDriver@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Gregory Clement <gregory.clement@...tlin.com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v4 3/3] arm64: dts: reset: add microchip sparx5 switch
 reset driver

On Wed, Jan 20, 2021 at 09:19:21AM +0100, Steen Hegelund wrote:
> This provides reset driver support for the Microchip Sparx5 PCB134 and
> PCB135 reference boards.

This isn't a compatible change. You need an explanation why that's okay 
if that's intended.

> 
> Signed-off-by: Steen Hegelund <steen.hegelund@...rochip.com>
> ---
>  arch/arm64/boot/dts/microchip/sparx5.dtsi | 14 +++++++++++---
>  1 file changed, 11 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/microchip/sparx5.dtsi b/arch/arm64/boot/dts/microchip/sparx5.dtsi
> index 380281f312d8..4edbb9fcdce0 100644
> --- a/arch/arm64/boot/dts/microchip/sparx5.dtsi
> +++ b/arch/arm64/boot/dts/microchip/sparx5.dtsi
> @@ -132,9 +132,17 @@ mux: mux-controller {
>  			};
>  		};
>  
> -		reset@...010008 {
> -			compatible = "microchip,sparx5-chip-reset";
> -			reg = <0x6 0x11010008 0x4>;
> +		gcb_ctrl: syscon@...010000 {
> +			compatible = "microchip,sparx5-gcb-syscon", "syscon";
> +			reg = <0x6 0x11010000 0x10000>;
> +		};
> +
> +		reset: reset-controller@0 {
> +			compatible = "microchip,sparx5-switch-reset";
> +			reg = <0x6 0x0 0x0>;

Your register length is 0?

> +			#reset-cells = <1>;
> +			cpu-syscon = <&cpu_ctrl>;

Can't you accomplish the same thing adding these to 
"microchip,sparx5-chip-reset"? Or possibly as a child node.

Define nodes based on h/w blocks, not as containers of things you happen 
to want for some driver.

> +			gcb-syscon = <&gcb_ctrl>;
>  		};
>  
>  		uart0: serial@...100000 {
> -- 
> 2.29.2
>