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

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Date:	Mon, 24 Aug 2015 08:56:14 -0500
From:	Rob Herring <robherring2@...il.com>
To:	Eric Anholt <eric@...olt.net>
Cc:	dri-devel <dri-devel@...ts.freedesktop.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Stephen Warren <swarren@...dotorg.org>,
	Lee Jones <lee@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-rpi-kernel@...ts.infradead.org,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 1/7] drm/vc4: Add devicetree bindings for VC4.

On Wed, Aug 12, 2015 at 7:56 PM, Eric Anholt <eric@...olt.net> wrote:
> Signed-off-by: Eric Anholt <eric@...olt.net>
> ---
>  .../devicetree/bindings/gpu/brcm,bcm-vc4.txt       | 83 ++++++++++++++++++++++
>  1 file changed, 83 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/gpu/brcm,bcm-vc4.txt
>
> diff --git a/Documentation/devicetree/bindings/gpu/brcm,bcm-vc4.txt b/Documentation/devicetree/bindings/gpu/brcm,bcm-vc4.txt
> new file mode 100644
> index 0000000..2b13e61
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/gpu/brcm,bcm-vc4.txt
> @@ -0,0 +1,83 @@
> +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.
> +
> +Required properties for VC4:
> +- compatible:  Should be "brcm,vc4"
> +- crtcs:       List of references to pixelvalve scanout engines
> +- hvss:                List of references to HVS video scalers
> +- encoders:    List of references to output encoders (HDMI, SDTV)

Creating these links is what the OF graph binding is for. Please use
it. Plus this is a DRMism in the binding.

> +
> +Required properties for Pixel Valve:
> +- compatible:  Should be "brcm,vc4-pixelvalve"

There's only one version of IP and all chips have the same bugs? You
should have chip names in the compatible strings.

> +- reg:         Physical base address and length of the PV's registers
> +- interrupts:  The interrupt number
> +                 See bindings/interrupt-controller/brcm,bcm2835-armctrl-ic.txt
> +
> +Required properties for HVS:
> +- compatible:  Should be "brcm,vc4-hvs"
> +- reg:         Physical base address and length of the HVS's registers
> +- interrupts:  The interrupt number
> +                 See bindings/interrupt-controller/brcm,bcm2835-armctrl-ic.txt
> +
> +Required properties for HDMI
> +- compatible:  Should be "brcm,vc4-hdmi"
> +- reg:         Physical base address and length of the two register ranges
> +                 ("HDMI" and "HD")
> +- interrupts:  The interrupt numbers
> +                 See bindings/interrupt-controller/brcm,bcm2835-armctrl-ic.txt
> +- ddc:         phandle of the I2C controller used for DDC EDID probing
> +- crtc:                phandle to the pixelvalve CRTC the HDMI encoder is attached to

Same comment about OF graph.

> +
> +Optional properties for HDMI:
> +- hpd-gpio:    The GPIO pin for HDMI hotplug detect (if it doesn't appear
> +                 as an interrupt/status bit in the HDMI controller
> +                 itself).  See bindings/pinctrl/brcm,bcm2835-gpio.txt

Use the hdmi-connector binding. This doesn't belong here. The clue is
your comment in parenthesis.

Rob
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