linux-kernel - Re: [PATCH v4 8/8] [DNI] arm64: dts: renesas: eagle: Specify channel amplitude

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Message-ID: <3a659060-8e73-0d58-0415-7f567556f966@gmail.com>
Date:   Thu, 12 Nov 2020 23:52:20 +0300
From:   Sergei Shtylyov <sergei.shtylyov@...il.com>
To:     Jacopo Mondi <jacopo+renesas@...ndi.org>,
        kieran.bingham+renesas@...asonboard.com,
        laurent.pinchart+renesas@...asonboard.com,
        niklas.soderlund+renesas@...natech.se, geert@...ux-m68k.org
Cc:     linux-media@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org, Hyun Kwon <hyunk@...inx.com>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Subject: Re: [PATCH v4 8/8] [DNI] arm64: dts: renesas: eagle: Specify channel
 amplitude

On 11/12/20 7:27 PM, Jacopo Mondi wrote:

> Use the newly introduced 'maxim,maxim,initial-reverse-channel-mV'

   "maxim," repeated twice.

> property to specify the initial reverse channel amplitude when the
> remote serializers are not pre-programmed with noise immunity threshold
> enabled.
> 
> Signed-off-by: Jacopo Mondi <jacopo+renesas@...ndi.org>
> ---
>  arch/arm64/boot/dts/renesas/r8a77970-eagle.dts | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/arm64/boot/dts/renesas/r8a77970-eagle.dts b/arch/arm64/boot/dts/renesas/r8a77970-eagle.dts
> index 45b947d44cee..75296865104c 100644
> --- a/arch/arm64/boot/dts/renesas/r8a77970-eagle.dts
> +++ b/arch/arm64/boot/dts/renesas/r8a77970-eagle.dts
> @@ -308,6 +308,7 @@ gmsl: gmsl-deserializer@48 {
>  
>  		/* eagle-pca9654-max9286-pwdn */
>  		enable-gpios = <&io_expander 0 GPIO_ACTIVE_HIGH>;
> +		maxim,initial-reverse-channel-mV = <100>;
>  
>  		/*
>  		 * Workaround: Hog the CAMVDD line high as we can't establish a

MBR, Sergei