linux-kernel - Re: [PATCH v2 1/7] drm/vc4: Add devicetree bindings for VC4.

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Message-ID: <20150826094438.GB2032@skynet.be>
Date:	Wed, 26 Aug 2015 11:44:39 +0200
From:	Luc Verhaegen <libv@...net.be>
To:	Eric Anholt <eric@...olt.net>
Cc:	dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
	Stephen Warren <swarren@...dotorg.org>,
	Lee Jones <lee@...nel.org>, linux-kernel@...r.kernel.org,
	linux-rpi-kernel@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 1/7] drm/vc4: Add devicetree bindings for VC4.

On Tue, Aug 18, 2015 at 02:54:02PM -0700, Eric Anholt wrote:
> VC4 is the GPU (display and 3D) subsystem present on the 2835 and some
> other Broadcom SoCs.
> ...
> +Broadcom VC4 GPU
> +
> +The VC4 device present on the Raspberry Pi includes a display system
> +with HDMI output and the HVS scaler for compositing display planes.

Is this a direct hw driver implementation, banging registers, or is this 
talking to the os/firmware/binary blob running on the videocore dsp?

Luc Verhaegen.
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