Date: Wed, 11 Nov 2015 12:48:50 -0600
From: Rob Herring <robh@kernel.org>
To: Liviu Dudau <Liviu.Dudau@arm.com>
Cc: David Airlie <airlied@linux.ie>, Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will.deacon@arm.com>, Sudeep Holla <sudeep.holla@arm.com>,
        Jon Medhurst <tixy@linaro.org>, Mark Rutland <mark.rutland@arm.com>,
        Ian Campbell <ijc+devicetree@hellion.org.uk>,
        Kumar Gala <galak@codeaurora.org>, Pawel Moll <pawel.moll@arm.com>,
        Arnd Bergmann <arnd@arndb.de>, Olof Johansson <olof@lixom.net>,
        Punit Agrawal <punit.agrawal@arm.com>,
        DRI devel <dri-devel@lists.freedesktop.org>,
        devicetree <devicetree@vger.kernel.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        LAKML <linux-arm-kernel@lists.infradead.org>,
        LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v2 1/4] drm: arm: Add DT bindings documentation for HDLCD
 driver.
Message-ID: <20151111184849.GA9172@rob-hp-laptop>
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On Wed, Nov 11, 2015 at 04:06:47PM +0000, Liviu Dudau wrote:
> Cc: Rob Herring <robh+dt@kernel.org>
> Cc: Pawel Moll <pawel.moll@arm.com>
> Cc: Mark Rutland <mark.rutland@arm.com>
> Cc: Ian Campbell <ijc+devicetree@hellion.org.uk>
> Cc: Kumar Gala <galak@codeaurora.org>
> 
> Signed-off-by: Liviu Dudau <Liviu.Dudau@arm.com>

Looks pretty good, but a few comments.

> ---
>  .../devicetree/bindings/drm/arm/arm,hdlcd.txt      | 74 ++++++++++++++++++++++
>  1 file changed, 74 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/drm/arm/arm,hdlcd.txt
> 
> diff --git a/Documentation/devicetree/bindings/drm/arm/arm,hdlcd.txt b/Documentation/devicetree/bindings/drm/arm/arm,hdlcd.txt
> new file mode 100644
> index 0000000..b57f1b9
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/drm/arm/arm,hdlcd.txt
> @@ -0,0 +1,74 @@
> +ARM HDLCD
> +
> +This is a display controller found on several development platforms produced
> +by ARM Ltd and in more modern of its' Fast Models. The HDLCD is an RGB
> +streamer that reads the data from a framebuffer and sends it to a single
> +digital encoder (DVI or HDMI).
> +
> +Required properties:
> +  - compatible: "arm,hdlcd"

Kind of generic. Something more specific please.

> +  - reg: Physical base address and length of the controller's registers.
> +    If a second pair of address and length values is present this specifies
> +    the presence of a DMA coherent memory area that the HDLCD can use as
> +    framebuffer instead of normal CMA memory.

This is on-chip RAM or nornal system RAM? We already have bindings for 
both.

> +  - interrupts: One interrupt used by the display controller to notify the
> +    interrupt controller when any of the interrupt sources programmed in
> +    the interrupt mask register have activated.
> +  - clocks: A list of phandle + clock-specifier pairs, one for each
> +    entry in 'clock-names'.
> +  - clock-names: A list of clock names. For HDLD it should contain:
> +      - "pxlclk" for the clock feeding the output PLL of the controller.
> +  - port: The HDLCD connection to an encoder chip. The connection is modelled
> +    using the OF graph bindings specified in Documentation/devicetree/bindings/graph.txt.
--
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