Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx> writes: > Hi Archit, > > On Friday 19 May 2017 14:24:36 Archit Taneja wrote: >> On 05/18/2017 08:25 PM, Laurent Pinchart wrote: >> > On Thursday 18 May 2017 13:56:19 Archit Taneja wrote: >> >> On 05/17/2017 12:16 AM, Eric Anholt wrote: >> > >> > [snip] >> > >> >>> In terms of physical connections: >> >>> [15-pin "DSI" connector on 2835] >> >>> | I2C | DSI >> >>> / \ SPI | >> >>> [TS] [Atmel]------[TC358762] >> >>> \ | >> >>> \PWM | >> >>> \ | DPI >> >>> >> >>> [some backlight]------[some unknown panel] >> >>> >> >>> The binding I'm trying to create is to expose what's necessary for a >> >>> driver that talks I2C to the Atmel, which then controls the PWM and does >> >>> the command sequence over SPI to the Toshiba that sets up its end of the >> >>> DSI link. >> >> >> >> The bridge (Atmel + TC358762 combination) here looks like it's primarily >> >> an i2c device (i.e, the control bus is i2c). Therefore, the drm-bridge >> >> driver here should be an i2c driver instead of a mipi_dsi_driver. >> > >> > Glad to see we agree, that's what I've proposed in a separate answer :-) >> > I'd go one step further though, there should be no DRM bridge, just a DRM >> > panel. >> >> If the PCB containing the controller chips and the panel are part of a >> single casing, and the set up won't work with another panel, then yeah, I >> agree. If the bridge chips are on a separate adapter board, and there is a >> possibility to connect other panels, then maybe a separate DRM bridge and a >> DRM panel might be a safer bet. > > I thought it was a single black box, but upon closer inspection there's a > separate PCB with the Microcontroller and TC358762. > > Eric, do you know if it's possible to exchange the panel for another one (and > not just an model with identical features from another vendor, but another > panel with a different mode for instance) without reprogramming the > microcontroller, or is the bridge board tied to the panel model ? Not without finding some other panel with equivalent non-standard connectors / doing your own soldering, at a minimum. And we don't know what kind of programming the microcontroller does, since it's a black box.
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