linux-kernel - Re: [PATCH v1 2/4] ARM: dts: rockchip: remove unlikly-to-exist DAC from elgin-r1

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Message-ID: <9a492f785e0851a828e0864c33204920@manjaro.org>
Date: Thu, 18 Jul 2024 06:20:21 +0200
From: Dragan Simic <dsimic@...jaro.org>
To: Conor Dooley <conor@...nel.org>
Cc: linux-kernel@...r.kernel.org, Conor Dooley <conor.dooley@...rochip.com>,
 Dinh Nguyen <dinguyen@...nel.org>, Rob Herring <robh@...nel.org>, Krzysztof
 Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, Heiko
 Stuebner <heiko@...ech.de>, Shawn Guo <shawnguo@...nel.org>, Sascha Hauer
 <s.hauer@...gutronix.de>, Pengutronix Kernel Team <kernel@...gutronix.de>,
 Fabio Estevam <festevam@...il.com>, Huacai Chen <chenhuacai@...nel.org>,
 WANG Xuerui <kernel@...0n.name>, devicetree@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-rockchip@...ts.infradead.org,
 imx@...ts.linux.dev, loongarch@...ts.linux.dev
Subject: Re: [PATCH v1 2/4] ARM: dts: rockchip: remove unlikly-to-exist DAC
 from elgin-r1

Hello Conor,

On 2024-07-17 11:37, Conor Dooley wrote:
> From: Conor Dooley <conor.dooley@...rochip.com>
> 
> The Rohm dh2228fv (really the bh2228fv, the compatible in the kernel 
> has
> a typo) does not support frequencies above 10 MHz, nor per the
> datasheet appear to use either CPOL or CPHA. I suspect that this
> devicetree is abusing the compatible in order to bind the spidev driver
> in Linux. Pretending to have devices on a board for this purpose is not
> acceptable, so remove it.
> 
> Signed-off-by: Conor Dooley <conor.dooley@...rochip.com>

There's a small typo in the patch subject:
s/unlikly/unlikely/

> ---
> I could not find any documentation for this board online, and it does
> not blatantly say that the device is a "spidev" like other [ab]users, 
> so
> it is possible there's actually a DAC here - but I doubt it is a
> bh2228fv given the other incompatibilities.
> ---
>  arch/arm/boot/dts/rockchip/rv1108-elgin-r1.dts | 8 --------
>  1 file changed, 8 deletions(-)
> 
> diff --git a/arch/arm/boot/dts/rockchip/rv1108-elgin-r1.dts
> b/arch/arm/boot/dts/rockchip/rv1108-elgin-r1.dts
> index 2d9994379eb2..9df1cef406c5 100644
> --- a/arch/arm/boot/dts/rockchip/rv1108-elgin-r1.dts
> +++ b/arch/arm/boot/dts/rockchip/rv1108-elgin-r1.dts
> @@ -167,14 +167,6 @@ &spi {
>  	pinctrl-names = "default";
>  	pinctrl-0 = <&spim1_clk &spim1_cs0 &spim1_tx &spim1_rx>;
>  	status = "okay";
> -
> -	dh2228fv: dac@0 {
> -		compatible = "rohm,dh2228fv";
> -		reg = <0>;
> -		spi-max-frequency = <24000000>;
> -		spi-cpha;
> -		spi-cpol;
> -	};
>  };
> 
>  &u2phy {