linux-kernel - Re: [PATCH v1 1/1] ARM: dts: rockchip: set crypto default disabled on rk3288

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Date:   Tue, 27 Aug 2019 16:28:21 +0200
From:   Heiko Stuebner <heiko@...ech.de>
To:     Elon Zhang <zhangzj@...k-chips.com>
Cc:     mark.rutland@....com, robh+dt@...nel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-rockchip@...ts.infradead.org
Subject: Re: [PATCH v1 1/1] ARM: dts: rockchip: set crypto default disabled on rk3288

Hi,

Am Dienstag, 27. August 2019, 09:14:39 CEST schrieb Elon Zhang:
> Not every board needs to enable crypto node, so the node should
> be set default disabled in rk3288.dtsi and enabled in specific
> board dts file.

Can you give a bit more rationale here? There would need to be a very
specific reason because of the following:

The crypto module is not wired to some board-specific components,
so its usability does not depend on the specific board at all.
Instead every board can just use it out of the box and the devicetree
is supposed to describe the hardware and is _not_ meant as a space
for user configuration.

So in fact the status property should probably go away completely from
the crypto node, as it's usable out of the box in all cases.

Heiko

> Signed-off-by: Elon Zhang <zhangzj@...k-chips.com>
> ---
>  arch/arm/boot/dts/rk3288.dtsi | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm/boot/dts/rk3288.dtsi b/arch/arm/boot/dts/rk3288.dtsi
> index cc893e154fe5..d509aa24177c 100644
> --- a/arch/arm/boot/dts/rk3288.dtsi
> +++ b/arch/arm/boot/dts/rk3288.dtsi
> @@ -984,7 +984,7 @@
>  		clock-names = "aclk", "hclk", "sclk", "apb_pclk";
>  		resets = <&cru SRST_CRYPTO>;
>  		reset-names = "crypto-rst";
> -		status = "okay";
> +		status = "disabled";
>  	};
>  
>  	iep_mmu: iommu@...00800 {
>