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From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
To: Maxime Ripard <maxime.ripard@free-electrons.com>
Cc: Mark Rutland <mark.rutland@arm.com>,
	Thomas Petazzoni <thomas.petazzoni@free-electrons.com>,
	jernej.skrabec@siol.net, plaes@plaes.org,
	devicetree@vger.kernel.org, David Airlie <airlied@linux.ie>,
	linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
	Chen-Yu Tsai <wens@csie.org>, Rob Herring <robh+dt@kernel.org>,
	thierry.reding@gmail.com, Daniel Vetter <daniel.vetter@intel.com>,
	linux-arm-kernel@lists.infradead.org, icenowy@aosc.io
Subject: Re: [PATCH v5 01/12] dt-bindings: panel: lvds: Document power-supply property
Date: Fri, 22 Dec 2017 14:08:20 +0200	[thread overview]
Message-ID: <2493504.1OPucrC18r@avalon> (raw)
In-Reply-To: <0a6a3abcf1a6b7f0e66a81af8a44c5c0566ce06c.1513854122.git-series.maxime.ripard@free-electrons.com>

Hi Maxime,

Thank you for the patch.

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@kernel.org>
> Signed-off-by: Maxime Ripard <maxime.ripard@free-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.

>  Backlight
>  ---------
> diff --git a/Documentation/devicetree/bindings/display/panel/panel-lvds.txt
> b/Documentation/devicetree/bindings/display/panel/panel-lvds.txt index
> b938269f841e..250850a2150b 100644
> --- a/Documentation/devicetree/bindings/display/panel/panel-lvds.txt
> +++ b/Documentation/devicetree/bindings/display/panel/panel-lvds.txt
> @@ -32,6 +32,7 @@ Optional properties:
>  - label: See panel-common.txt.
>  - gpios: See panel-common.txt.
>  - backlight: See panel-common.txt.
> +- power-supply: See panel-common.txt.
>  - data-mirror: If set, reverse the bit order described in the data mappings
> below on all data lanes, transmitting bits for slots 6 to 0 instead of 0 to
> 6.
> diff --git
> a/Documentation/devicetree/bindings/display/panel/simple-panel.txt
> b/Documentation/devicetree/bindings/display/panel/simple-panel.txt index
> 1341bbf4aa3d..16d8ff088b7d 100644
> --- a/Documentation/devicetree/bindings/display/panel/simple-panel.txt
> +++ b/Documentation/devicetree/bindings/display/panel/simple-panel.txt
> @@ -1,7 +1,7 @@
>  Simple display panel
> 
>  Required properties:
> -- power-supply: regulator to provide the supply voltage
> +- power-supply: See panel-common.txt
> 
>  Optional properties:
>  - ddc-i2c-bus: phandle of an I2C controller used for DDC EDID probing

-- 
Regards,

Laurent Pinchart

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  reply	other threads:[~2017-12-22 12:08 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-12-21 11:02 [PATCH v5 00/12] drm/sun4i: Add A83t LVDS support Maxime Ripard
2017-12-21 11:02 ` [PATCH v5 01/12] dt-bindings: panel: lvds: Document power-supply property Maxime Ripard
2017-12-22 12:08   ` Laurent Pinchart [this message]
2018-01-04 19:44     ` Maxime Ripard
     [not found]       ` <20180104194436.reka6nw5hf32o4p3-ZC1Zs529Oq4@public.gmane.org>
2018-01-04 20:05         ` Laurent Pinchart
2017-12-21 11:02 ` [PATCH v5 02/12] drm/panel: lvds: Add support for the " Maxime Ripard
2017-12-22 12:09   ` Laurent Pinchart
2017-12-21 11:02 ` [PATCH v5 03/12] dt-bindings: display: sun4i-drm: Add LVDS properties Maxime Ripard
     [not found]   ` <ddbde28fe2e4f21412974e4c69fbfe1c5ff9383f.1513854122.git-series.maxime.ripard-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
2017-12-30 11:45     ` Jernej Škrabec
2018-01-04 19:03       ` Maxime Ripard
2017-12-21 11:02 ` [PATCH v5 04/12] dt-bindings: display: sun4i-drm: Add A83T pipeline Maxime Ripard
2017-12-21 11:02 ` [PATCH v5 05/12] drm/sun4i: Force the mixer rate at 150MHz Maxime Ripard
2017-12-21 11:02 ` [PATCH v5 06/12] drm/sun4i: Create minimal multipliers and dividers Maxime Ripard
2017-12-21 11:02 ` [PATCH v5 07/12] drm/sun4i: Add LVDS support Maxime Ripard
2017-12-21 11:02 ` [PATCH v5 08/12] drm/sun4i: Add A83T support Maxime Ripard
2017-12-21 11:02 ` [PATCH v5 09/12] ARM: dts: sun8i: a83t: Add display pipeline Maxime Ripard
2017-12-21 11:02 ` [PATCH v5 10/12] ARM: dts: sun8i: a83t: Enable the PWM Maxime Ripard
2017-12-21 11:02 ` [PATCH v5 11/12] ARM: dts: sun8i: a83t: Add LVDS pins group Maxime Ripard
2017-12-21 11:02 ` [PATCH v5 12/12] ARM: dts: sun8i: a711: Enable the LCD Maxime Ripard
2018-01-05  9:39 ` [PATCH v5 00/12] drm/sun4i: Add A83t LVDS support Maxime Ripard

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