Add information on setting up Touch Display 2 on Compute Modules #4072
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6by9
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Apr 16, 2025
documentation/asciidoc/computers/compute-module/cmio-display.adoc
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documentation/asciidoc/computers/compute-module/cmio-display.adoc
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lurch
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Apr 16, 2025
lurch
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lurch
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Apr 16, 2025
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I have pushed changes requested. |
lurch
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Apr 22, 2025
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| === Installation on Compute Module based devices. | ||
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| All Raspberry Pi SBCs auto-detect the official touch display's as the circuitry connecting it to the DSI connector is fixed, and this autodetection ensures the correct Device Tree entries are passed to the kernel. However, Compute Modules are intended for industrial applications where the integrator can use any and all GPIOs and interfaces for whatever purposes they require. Autodetection is therefore not feasible, and hence is disabled on Compute Module devices. This means that the Device Tree fragments required to set up the display need to be loaded via some other mechanism, which can be either with a dtoverlay entry in config.txt as described above, via a custom base DT file, or if present, a HAT EEPROM. |
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"touch display's" -> "Touch Displays" ? (capitalisation is optional, removal of greengrocer's apostrophe isn't 😜 )
I wonder if "... is fixed, and this ..." would be better as "... is fixed; this ..." ?
lurch
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Apr 22, 2025
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| Creating a custom base Device tree file is beyond the scope of this documenation, however, it is simple to add an appropriate device tree entry via `config.txt` | ||
| Creating a custom base Device tree file is beyond the scope of this documentation, however, it is simple to add an appropriate device tree entry via `config.txt`. See this xref:../../computers/compute-module/cmio-display.adoc#Attaching-the-Touch-Display-2-LCD-panel[page] for connection details. |
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"connection details" -> "configuration details" ?
lurch
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Apr 22, 2025
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| All Raspberry Pi SBCs auto-detect the official touch display's as the circuitry connecting it to the DSI connector is fixed, and this autodetection ensures the correct Device Tree entries are passed to the kernel. However, Compute Modules are intended for industrial applications where the integrator can use any and all GPIOs and interfaces for whatever purposes they require. Autodetection is therefore not feasible, and hence is disabled on Compute Module devices. This means that the Device Tree fragments required to set up the display need to be loaded via some other mechanism, which can be either with a dtoverlay entry in config.txt, via a custom base DT file, or if present, a HAT EEPROM. | ||
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| Creating a custom base Device tree file is beyond the scope of this documentation, however, it is simple to add an appropriate device tree entry via `config.txt`. See this xref:../../computers/compute-module/cmio-display.adoc#Attaching-the-Touch-Display-2-LCD-panel[page] for connection details. |
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The xref URL here needs to be ../computers/compute-module.adoc#attaching-the-touch-display-2-lcd-panel
lurch
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Apr 22, 2025
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| == Attaching the Touch Display 2 LCD panel | ||
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| Touch Display 2 is a 720x1280 7" LCD display designed specifically for Raspberry Pi devices (see https://www.raspberrypi.com/products/touch-display-2/). It connects in much the same way as the original touch display, but the software setup on Compute Modules is slightly different as it uses a different display driver. See xref:../../accessories/touch-display-2/about.adoc[Touch Display 2] for connection details. |
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The xref URL here needs to be ../accessories/touch-display-2.adoc
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There was missing information on the dt runes needed to get TD2 up and running on CM devices.