linux-kernel - Re: [PATCH 1/3] ARM: dts: exynos: Fix missing empty reg/ranges property regulators on Trats

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Message-ID: <03a23289-1188-db77-6c38-a7dddeac183c@kernel.org>
Date:   Mon, 29 Jun 2020 21:50:26 +0200
From:   Sylwester Nawrocki <snawrocki@...nel.org>
To:     Krzysztof Kozlowski <krzk@...nel.org>
Cc:     Rob Herring <robh+dt@...nel.org>, Kukjin Kim <kgene@...nel.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Pankaj Dubey <pankaj.dubey@...sung.com>
Subject: Re: [PATCH 1/3] ARM: dts: exynos: Fix missing empty reg/ranges
 property regulators on Trats

Hi Krzysztof,

On 6/29/20 21:33, Krzysztof Kozlowski wrote:
> Remove the simple-bus compatible from a regulators node because its
> children do not have any unit addresses.  This fixes DTC warning:
> 
>      Warning (simple_bus_reg): /regulators/regulator-0: missing or empty reg/ranges property
> 
> Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>
> ---
>   arch/arm/boot/dts/exynos4210-trats.dts | 2 --
>   1 file changed, 2 deletions(-)
> 
> diff --git a/arch/arm/boot/dts/exynos4210-trats.dts b/arch/arm/boot/dts/exynos4210-trats.dts
> index 3d791db6095c..cec413ee4490 100644
> --- a/arch/arm/boot/dts/exynos4210-trats.dts
> +++ b/arch/arm/boot/dts/exynos4210-trats.dts
> @@ -31,8 +31,6 @@
>   	};
>   
>   	regulators {
> -		compatible = "simple-bus";

I think you would also need to remove the 'regulators' node altogether, 
otherwise with your change the subnodes below won't get parsed and the 
regulators will not get registered.

>   		vemmc_reg: regulator-0 {
>   			compatible = "regulator-fixed";
>   			regulator-name = "VMEM_VDD_2.8V";
> 

--
Thanks,
Sylwester