linux-kernel - Re: [PATCH v5 01/12] dt-bindings: panel: lvds: Document power-supply property

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Message-ID: <1938450.ezem5N80bY@avalon>
Date:   Thu, 04 Jan 2018 22:05:13 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:     Daniel Vetter <daniel.vetter@...el.com>,
        David Airlie <airlied@...ux.ie>, Chen-Yu Tsai <wens@...e.org>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Mark Rutland <mark.rutland@....com>,
        Rob Herring <robh+dt@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, plaes@...es.org,
        icenowy@...c.io,
        Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
        jernej.skrabec@...l.net, devicetree@...r.kernel.org,
        thierry.reding@...il.com
Subject: Re: [PATCH v5 01/12] dt-bindings: panel: lvds: Document power-supply property

Hi Maxime,

On Thursday, 4 January 2018 21:44:36 EET Maxime Ripard wrote:
> On Fri, Dec 22, 2017 at 02:08:20PM +0200, Laurent Pinchart wrote:
> > On Thursday, 21 December 2017 13:02:27 EET Maxime Ripard wrote:
> >> The power-supply property is used by a vast majority of panels,
> >> including panel-simple. Let's document it as a common property
> >> 
> >> Reviewed-by: Rob Herring <robh@...nel.org>
> >> Signed-off-by: Maxime Ripard <maxime.ripard@...e-electrons.com>
> >> ---
> >> 
> >> Documentation/devicetree/bindings/display/panel/panel-common.txt | 6 ++++
> >> Documentation/devicetree/bindings/display/panel/panel-lvds.txt   | 1 +
> >> Documentation/devicetree/bindings/display/panel/simple-panel.txt | 2 +-
> >> 3 files changed, 8 insertions(+), 1 deletion(-)
> >> 
> >> diff --git
> >> a/Documentation/devicetree/bindings/display/panel/panel-common.txt
> >> b/Documentation/devicetree/bindings/display/panel/panel-common.txt index
> >> ec52c472c845..125ea68052af 100644
> >> --- a/Documentation/devicetree/bindings/display/panel/panel-common.txt
> >> +++ b/Documentation/devicetree/bindings/display/panel/panel-common.txt
> >> @@ -78,6 +78,12 @@ used for panels that implement compatible control
> >> signals. while active. Active high reset signals can be supported by
> >> inverting the GPIO specifier polarity flag.
> >> 
> >> +Power
> >> +-----
> >> +
> >> +- power-supply: many display panels need an additional power supply in
> >> +  order to be fully powered-up. For such panels, power-supply contains
> >> +  a phandle to the regulator powering the panel.
> > 
> > I think we should give more details here about the limitations of this
> > property. How about the following explanation ?
> > 
> > - power-supply: display panels require power to be supplied. While several
> > panels need more than one power supply with panel-specific constraints
> > governing the order and timings of the power supplies, in many cases a
> > single power supply is sufficient, either because the panel has a single
> > power rail, or because all its power rails can be driven by the same
> > supply. In that case the power-supply property specifies the supply
> > powering the panel as a phandle to a regulator.
> 
> That works for me. Do you want me to resend it with that text, or
> should I merge it (and if so, with your Reviewed-by or Acked-by?)?

No need to resend if it's just for me. With the above text,

Acked-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

(on a side note, I wonder if it's more efficient to ask whether to resend 
instead of just resending :-))

-- 
Regards,

Laurent Pinchart