linux-kernel - Re: [PATCH 02/10] dt: add img,axd.txt device tree binding document

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Date:	Mon, 24 Aug 2015 14:26:33 +0100
From:	Mark Rutland <mark.rutland@....com>
To:	Qais Yousef <qais.yousef@...tec.com>
Cc:	"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <Pawel.Moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 02/10] dt: add img,axd.txt device tree binding document

On Mon, Aug 24, 2015 at 01:39:11PM +0100, Qais Yousef wrote:
> Signed-off-by: Qais Yousef <qais.yousef@...tec.com>
> Cc: Rob Herring <robh+dt@...nel.org>
> Cc: Pawel Moll <pawel.moll@....com>
> Cc: Mark Rutland <mark.rutland@....com>
> Cc: Ian Campbell <ijc+devicetree@...lion.org.uk>
> Cc: Kumar Gala <galak@...eaurora.org>
> Cc: devicetree@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> ---
>  .../devicetree/bindings/sound/img,axd.txt          | 34 ++++++++++++++++++++++
>  1 file changed, 34 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/sound/img,axd.txt
> 
> diff --git a/Documentation/devicetree/bindings/sound/img,axd.txt b/Documentation/devicetree/bindings/sound/img,axd.txt
> new file mode 100644
> index 000000000000..6a8764a79d01
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/sound/img,axd.txt
> @@ -0,0 +1,34 @@
> +* AXD Audio Processing IP Binding *
> +
> +Required properties:
> +- compatible: "img,axd"

This sounds awfully generic. Is there not a more complete name?

> +- clocks: phandle for the clock that drives AXD.
> +- interrupts: the GIC interrupt where AXD is connected
> +- gic-irq: it takes two non-zero values, the first one is the host hwirq and
> +           the second one is AXD's. Host's hwirq should match the value in
> +           interrupts.

I don't understand what this gic-irq property is for; and it generally
doesn't look right.

Could you please describe what this is and why you thing it is
necessary?

> +
> +Optional properties:
> +- vpe: VPE number on which AXD should start. Must be provided if AXD is
> +       running as a single VPE along Linux on the same core.
> +       It can't be VPE0.
> +       The VPE will be offlined before AXD is loaded.

Likewise could you please elaborate on this is?

What is a VPE number? What does it mean to start at that number?

> +- inbuf-size: size of shared input buffers area. By default it's 0x7800 bytes.
> +- outbuf-size: size of shared output buffers area. By default it's 0x3c000 bytes.

Is this something the kernel dynamically allocates? Why does this need
to be in the DT?

Thanks,
Mark.

> +
> +
> +Example:
> +
> +	axdclk: axdclk@...M {
> +		#clock-cells = <0>;
> +		compatible = "fixed-clock";
> +		clock-frequency = <400000000>;
> +	};
> +
> +	axd {
> +		compatible = "img,axd";
> +		clocks = <&axdclk>;
> +		interrupts = <36 IRQ_TYPE_EDGE_RISING>;
> +		gic-irq = <36 37>;
> +		vpe = <1>;
> +	};
> -- 
> 2.1.0
> 
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