linux-kernel - Re: [PATCH v1 3/3] ARM64 LPC: update binding doc

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Date:	Wed, 30 Dec 2015 10:06:54 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Rongrong Zou <zourongrong@...il.com>
Cc:	catalin.marinas@....com, will.deacon@....com,
	benh@...nel.crashing.org, lijianhua@...wei.com,
	lixiancai@...wei.com, linuxarm@...wei.com,
	linux-kernel@...r.kernel.org, minyard@....org,
	gregkh@...uxfoundation.org
Subject: Re: [PATCH v1 3/3] ARM64 LPC: update binding doc

On Tuesday 29 December 2015 21:33:52 Rongrong Zou wrote:
> Signed-off-by: Rongrong Zou <zourongrong@...il.com>
> ---
>  .../devicetree/bindings/arm64/low-pin-count.txt      | 20 ++++++++++++++++++++
>  1 file changed, 20 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/arm64/low-pin-count.txt
> 
> diff --git a/Documentation/devicetree/bindings/arm64/low-pin-count.txt b/Documentation/devicetree/bindings/arm64/low-pin-count.txt
> new file mode 100644
> index 0000000..215f2c4
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/arm64/low-pin-count.txt
> @@ -0,0 +1,20 @@
> +Low Pin Count bus driver
> +
> +Usually LPC controller is part of PCI host bridge, so the legacy ISA
> +port locate on LPC bus can be accessed directly. But some SoC have
> +independent LPC controller, and we can access the legacy port by specifying
> +LPC address cycle. Thus, LPC driver is introduced.
> +
> +Required properties:
> +- compatible: "low-pin-count"
> +- reg: specifies low pin count address range
> +
> +
> +Example:
> +
> +        lpc_0: lpc@...b0000 {
> +		#address-cells = <1>;
> +		#size-cells = <1>;
> +                compatible = "low-pin-count";
> +                reg = <0x0 0xa01b0000 0x0 0x10000>;
> +        };

One more thought: please try to stick as closely as possible to the existing
ISA binding that is documented at

http://www.firmware.org/1275/bindings/isa/isa0_4d.ps

In particular, this should cover the possibility of describing both memory
and I/O spaces in child devices.

	Arnd
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