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Sat, 10 Oct 2020 11:08:48 +0200 (CEST) Subject: Re: [PATCH v2 3/7] dt-bindings: display: mxsfb: Add a bus-width endpoint property To: Laurent Pinchart References: <20201007012438.27970-1-laurent.pinchart@ideasonboard.com> <20201007012438.27970-4-laurent.pinchart@ideasonboard.com> <7b8df7af-5ca8-708b-4975-2fdf4280116f@denx.de> <20201009235843.GR25040@pendragon.ideasonboard.com> From: Marek Vasut Message-ID: <9c7615d6-0f69-5f67-0795-b86ecea2eea8@denx.de> Date: Sat, 10 Oct 2020 10:47:05 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.12.0 MIME-Version: 1.0 In-Reply-To: <20201009235843.GR25040@pendragon.ideasonboard.com> Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201010_050855_557206_CAC209A9 X-CRM114-Status: GOOD ( 20.15 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, =?UTF-8?Q?Guido_G=c3=bcnther?= , Stefan Agner , Rob Herring , dri-devel@lists.freedesktop.org, Pengutronix Kernel Team , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 10/10/20 1:58 AM, Laurent Pinchart wrote: > Hi Marek, Hi, > 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). I think that's exactly what the interface-pix-fmt was trying to solve for the IPUv3, there you could have e.g. both RGB666 and LVDS666 , which were different. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel