[PATCH] drm: support gpu aliases defined in DT data

[Maxime Ripard]

On Thu, Jan 17, 2019 at 01:19:18PM +0200, Tomi Valkeinen wrote:
> The DRM device minor numbers are allocated according to the registration
> order. This causes confusion in cases where the registration order can
> change, or when, say, a modesetting capable device is preferred to be
> card0, and a rendering device is preferred to be card1.
> 
> This patch adds similar functionality that is used in some other
> subsystems, where device minor numbers can be defined in DT bindings'
> aliases node.
> 
> For example, this sets the DRM device minor number to 1 for the 'dss'
> device.
> 
> aliases {
> 	gpu1 = &dss;
> };
> 
> The logic on how to pick the minor number is:
> 
> - if there's a DT gpu alias for the device, use that
> - else, if there are any gpu aliases, pick a minor number that is higher
>   than any of the aliases.
> - else, use the full range of possible numbers
> 
> Signed-off-by: Tomi Valkeinen <tomi.valkeinen at ti.com>

I guess we'd need a binding document for this? IIRC, Rob was against
introducing new aliases. Rob?

Maxime

-- 
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
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