linux-kernel - Re: [PATCH 1/3 v3] drm/vc4: Turn the V3D clock on at runtime.

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Date:   Fri, 28 Apr 2017 13:29:13 -0500
From:   Rob Herring <robh@...nel.org>
To:     Eric Anholt <eric@...olt.net>
Cc:     dri-devel@...ts.freedesktop.org,
        Mark Rutland <mark.rutland@....com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3 v3] drm/vc4: Turn the V3D clock on at runtime.

On Mon, Apr 24, 2017 at 01:12:09PM -0700, Eric Anholt wrote:
> For the Raspberry Pi's bindings, the power domain also implicitly
> turns on the clock and deasserts reset, but for the new Cygnus port we
> start representing the clock in the devicetree.
> 
> v2: Document the clock-names property, check for -ENOENT for no clock
>     in DT.
> v3: Drop NULL checks around clk calls which embed NULL checks.
> 
> Signed-off-by: Eric Anholt <eric@...olt.net>
> ---
>  .../devicetree/bindings/display/brcm,bcm-vc4.txt   |  4 +++
>  drivers/gpu/drm/vc4/vc4_drv.h                      |  1 +
>  drivers/gpu/drm/vc4/vc4_v3d.c                      | 31 +++++++++++++++++++++-
>  3 files changed, 35 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/display/brcm,bcm-vc4.txt b/Documentation/devicetree/bindings/display/brcm,bcm-vc4.txt
> index ca02d3e4db91..2318266f6481 100644
> --- a/Documentation/devicetree/bindings/display/brcm,bcm-vc4.txt
> +++ b/Documentation/devicetree/bindings/display/brcm,bcm-vc4.txt
> @@ -59,6 +59,10 @@ Required properties for V3D:
>  - interrupts:	The interrupt number
>  		  See bindings/interrupt-controller/brcm,bcm2835-armctrl-ic.txt
>  
> +Optional properties for V3D:
> +- clocks:	The clock the unit runs on
> +- clock-names:	Must be "v3d_clk"

clock-names is pointless for a single clock. 

> +
>  Required properties for DSI:
>  - compatible:	Should be "brcm,bcm2835-dsi0" or "brcm,bcm2835-dsi1"
>  - reg:		Physical base address and length of the DSI block's registers