linux-kernel - Re: [PATCH v3 1/4] dt-bindings: display: mediatek: add property to control mipi tx drive current

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Mon, 23 Mar 2020 16:00:33 -0600
From:   Rob Herring <robh@...nel.org>
To:     Jitao Shi <jitao.shi@...iatek.com>
Cc:     Mark Rutland <mark.rutland@....com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        linux-mediatek@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, srv_heupstream@...iatek.com,
        yingjoe.chen@...iatek.com, eddie.huang@...iatek.com,
        cawa.cheng@...iatek.com, bibby.hsieh@...iatek.com,
        ck.hu@...iatek.com, stonea168@....com, huijuan.xie@...iatek.com
Subject: Re: [PATCH v3 1/4] dt-bindings: display: mediatek: add property to
 control mipi tx drive current

On Wed, Mar 11, 2020 at 03:40:29PM +0800, Jitao Shi wrote:
> Add a property to control mipi tx drive current:
> "drive-strength-microamp"
> 
> Signed-off-by: Jitao Shi <jitao.shi@...iatek.com>
> ---
>  .../devicetree/bindings/display/mediatek/mediatek,dsi.txt     | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/display/mediatek/mediatek,dsi.txt b/Documentation/devicetree/bindings/display/mediatek/mediatek,dsi.txt
> index a19a6cc375ed..d501f9ff4b1f 100644
> --- a/Documentation/devicetree/bindings/display/mediatek/mediatek,dsi.txt
> +++ b/Documentation/devicetree/bindings/display/mediatek/mediatek,dsi.txt
> @@ -33,6 +33,9 @@ Required properties:
>  - #clock-cells: must be <0>;
>  - #phy-cells: must be <0>.
>  
> +Optional properties:
> +- drive-strength-microamp: adjust driving current, should be 1 ~ 0xF

TBC, 1-0xf is in units of microamps? So a max drive strength of 15uA? 
Seems a bit low.

> +
>  Example:
>  
>  mipi_tx0: mipi-dphy@...15000 {
> @@ -42,6 +45,7 @@ mipi_tx0: mipi-dphy@...15000 {
>  	clock-output-names = "mipi_tx0_pll";
>  	#clock-cells = <0>;
>  	#phy-cells = <0>;
> +	drive-strength-microamp = <0x8>;
>  };
>  
>  dsi0: dsi@...1b000 {
> -- 
> 2.21.0