[PATCH 0/3] drm/panel: simple: Add mode support to devicetree

Eric Anholt eric at anholt.net
Wed Feb 7 01:16:22 PST 2018

Sean Paul <seanpaul at chromium.org> writes:

> Hey all,
> Here's a set which allows us to add an "override" mode to the simple
> panel dt node. The override mode can be used for devices for which the
> typical display timing is not sufficient, yet the overriding mode should
> not be applied across the entire platform. 
> An example of this (and the motivation) is the Chromebook Plus (kevin).
> If the sharp panel on this laptop is run at the mode advertised in the
> datasheet (and what is currently in mainline), it creates interference
> with the touch digitizer. To fix this, we need to run the pixel clock at
> a slightly higher rate (which we can do by increasing the back porches).
> This "fix" should not be used on other rockchip devices using this panel
> since they might not encounter the same interference.
> If an override mode is present, it will be checked against the panel's
> display_timing range. When validated, it will be exposed as the
> preferred mode along with the 'typical' modes generated from the panel's
> display_timing.
> This set is based on Linus' master to pick up the edp support in
> rk3399-gru-kevin.dts.

Couldn't you just add a different compatible string for the panel
driver, and use that to have a different mode exposed from the panel?
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