linux-kernel - Re: [PATCH v4 2/5] mfd: dt: ranges, #address-cells and #size-cells as optional properties

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Date:   Wed, 4 Jan 2017 11:36:08 +0000
From:   Lee Jones <lee.jones@...aro.org>
To:     Andrew Jeffery <andrew@...id.au>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Corey Minyard <minyard@....org>,
        Cédric Le Goater <clg@...d.org>,
        Joel Stanley <joel@....id.au>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 2/5] mfd: dt: ranges, #address-cells and #size-cells
 as optional properties

On Tue, 20 Dec 2016, Andrew Jeffery wrote:

> Whilst describing a device and not a bus, simple-mfd is modelled on
> simple-bus where child nodes are iterated and registered as platform
> devices. Some complex devices, e.g. the Aspeed LPC controller, can
> benefit from address space mapping such that child nodes can use the
> regs property to describe their resource offsets within the
> multi-function device.
> 
> Signed-off-by: Andrew Jeffery <andrew@...id.au>
> Acked-by: Rob Herring <robh@...nel.org>
> ---
>  Documentation/devicetree/bindings/mfd/mfd.txt | 10 ++++++++++
>  1 file changed, 10 insertions(+)

Applied, thanks.

> diff --git a/Documentation/devicetree/bindings/mfd/mfd.txt b/Documentation/devicetree/bindings/mfd/mfd.txt
> index f1fceeda12f1..bcb6abb9d413 100644
> --- a/Documentation/devicetree/bindings/mfd/mfd.txt
> +++ b/Documentation/devicetree/bindings/mfd/mfd.txt
> @@ -25,6 +25,16 @@ Optional properties:
>    be used. In the latter case the child devices will be determined by the
>    operating system.
>  
> +- ranges: Describes the address mapping relationship to the parent. Should set
> +  the child's base address to 0, the physical address within parent's address
> +  space, and the length of the address map.
> +
> +- #address-cells: Specifies the number of cells used to represent physical base
> +  addresses. Must be present if ranges is used.
> +
> +- #size-cells: Specifies the number of cells used to represent the size of an
> +  address. Must be present if ranges is used.
> +
>  Example:
>  
>  foo@...0 {

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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