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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 Hi Kenneth, > -----Original Message----- > From: Kenneth Sloat > Sent: Thursday, August 20, 2020 2:18 PM > To: Hyun Kwon ; linux-arm-kernel@lists.infradead.org > Cc: Michal Simek ; dri-devel@lists.freedesktop.org; linux- > kernel@vger.kernel.org; laurent.pinchart@ideasonboard.com; > devicetree@vger.kernel.org; linux-kernel@vger.kernel.org; > mark.rutland@arm.com > Subject: dt-bindings: display: xlnx: mixer: Inconsistent pixel format terminology > in dt docs > > Hello, > > The Xilinx Video mixer IP uses the DRM fourcc string as a device tree binding in > order to describe the format for a specific DRM layer/plane. Currently, in the > device tree doc in > "Documentation/devicetree/bindings/dma/xilinx/xilinx_frmbuf.txt" there is a list > called "VIDEO FORMATS" with a table containing "Mixer IP Format" and > associated "Driver supported Format String" (fourcc). In general, this table is not > helpful, because "Mixer IP Format" does not match the Xilinx IP datasheet > terminology for formats but rather some other commonly used nomenclature. > This is also inconsistent from other Xilinx dts binding docs which specify the > actual correct IP name and at times list other format nomenclature where > helpful (i.e. xilinx_frmbuf.txt) > > My suggestion is to remove the current "Mixer IP Format" strings in the doc and > replace them with the actual IP names in the datasheet (which also match those > used in Xilinx's Vivado FPGA tool). Otherwise, the programmer must cross > reference other dts documentation or the code in order to figure these out. I am > happy to provide a patch for this but wanted to throw out the suggestion first. I agree. The bindings should be in sync with datasheet and not rely on software definitions. Since the driver is only in Xilinx vendor tree, please send directly to git@xilinx.com. Thanks! -hyun > > Thanks > > Sincerely, > Ken Sloat _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel