From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
To: Marek Vasut <marex@denx.de>
Cc: devicetree@vger.kernel.org, "Guido Günther" <agx@sigxcpu.org>,
"Rob Herring" <robh+dt@kernel.org>,
dri-devel@lists.freedesktop.org,
"Pengutronix Kernel Team" <kernel@pengutronix.de>,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v2 3/7] dt-bindings: display: mxsfb: Add a bus-width endpoint property
Date: Sat, 10 Oct 2020 02:58:43 +0300 [thread overview]
Message-ID: <20201009235843.GR25040@pendragon.ideasonboard.com> (raw)
In-Reply-To: <7b8df7af-5ca8-708b-4975-2fdf4280116f@denx.de>
Hi Marek,
On Wed, Oct 07, 2020 at 10:40:26AM +0200, Marek Vasut wrote:
> On 10/7/20 3:24 AM, Laurent Pinchart wrote:
>
> [...]
>
> > + bus-width:
> > + enum: [16, 18, 24]
> > + description: |
> > + The output bus width. This value overrides the configuration
> > + derived from the connected device (encoder or panel). It should
> > + only be specified when PCB routing of the data signals require a
> > + different bus width on the LCDIF and the connected device. For
> > + instance, when a 18-bit RGB panel has its R[5:0], G[5:0] and
> > + B[5:0] signals connected to LCD_DATA[7:2], LCD_DATA[15:10] and
> > + LCD_DATA[23:18] instead of LCD_DATA[5:0], LCD_DATA[11:6] and
> > + LCD_DATA[17:12], bus-width should be set to 24.
>
> The iMX6 IPUv3 uses interface-pix-fmt which is a bit more flexible, but
> I'm not sure whether it's the right way to go about this, see:
> Documentation/devicetree/bindings/display/imx/fsl-imx-drm.txt
I think specifying the bus with is better. It's a standard property, but
more than that, a given bus width can carry different formats. For
instance, a 24-bus could carry RGB666 data (with dithering for the
LSBs).
--
Regards,
Laurent Pinchart
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next prev parent reply other threads:[~2020-10-09 23:59 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-07 1:24 [PATCH v2 0/7] drm: mxsfb: Allow overriding bus width Laurent Pinchart
2020-10-07 1:24 ` [PATCH v2 1/7] dt-bindings: display: mxsfb: Convert binding to YAML Laurent Pinchart
2020-10-07 8:32 ` Marek Vasut
2020-10-07 8:43 ` Lucas Stach
2020-10-07 8:55 ` Marek Vasut
2020-10-07 13:33 ` Laurent Pinchart
2020-10-07 14:20 ` Marek Vasut
2020-10-07 16:00 ` Rob Herring
2020-10-07 16:02 ` Rob Herring
2020-10-09 23:52 ` Laurent Pinchart
2021-01-15 7:59 ` Martin Kepplinger
2021-01-15 22:25 ` Laurent Pinchart
2021-01-16 6:41 ` Martin Kepplinger
2020-10-07 1:24 ` [PATCH v2 2/7] dt-bindings: display: mxsfb: Add and fix compatible strings Laurent Pinchart
2020-10-07 8:35 ` Marek Vasut
2020-10-07 16:01 ` Rob Herring
2020-10-07 1:24 ` [PATCH v2 3/7] dt-bindings: display: mxsfb: Add a bus-width endpoint property Laurent Pinchart
2020-10-07 8:40 ` Marek Vasut
2020-10-09 23:58 ` Laurent Pinchart [this message]
2020-10-10 8:47 ` Marek Vasut
2020-10-13 2:06 ` Laurent Pinchart
2020-10-13 11:03 ` Marek Vasut
2020-10-07 16:03 ` Rob Herring
2020-10-07 1:24 ` [PATCH v2 4/7] ARM: dts: imx: Fix LCDIF compatible strings Laurent Pinchart
2020-10-07 1:24 ` [PATCH v2 5/7] arm64: dts: imx8mq: " Laurent Pinchart
2020-10-07 1:24 ` [PATCH v2 6/7] ARM: dts: imx: Remove unneeded LCDIF disp_axi clock Laurent Pinchart
2020-10-07 1:24 ` [PATCH v2 7/7] drm: mxsfb: Add support for the bus-width DT property Laurent Pinchart
2020-10-10 0:01 ` [PATCH v2 8/7] dt-bindings: display: mxsfb: Add compatible for i.MX8MM Laurent Pinchart
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