linux-kernel - Re: [PATCH 2/2] Documentation: bindings: add description of phy for sdhci-of-arasan

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Date:	Sun, 13 Sep 2015 19:47:02 -0700
From:	Sören Brinkmann <soren.brinkmann@...inx.com>
To:	Shawn Lin <shawn.lin@...k-chips.com>
CC:	Michal Simek <michal.simek@...inx.com>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	<linux-mmc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-rockchip@...ts.infradead.org>, <devicetree@...r.kernel.org>
Subject: Re: [PATCH 2/2] Documentation: bindings: add description of phy for
 sdhci-of-arasan

Hi Shawn,

On Fri, 2015-09-11 at 04:55PM +0800, Shawn Lin wrote:
> This patch adds phys and phy-names for sdhci-of-arasan as optional
> properties, and details the example as well.
> 
> Signed-off-by: Shawn Lin <shawn.lin@...k-chips.com>
> ---
> 
>  Documentation/devicetree/bindings/mmc/arasan,sdhci.txt | 10 ++++++++--
>  1 file changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt b/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
> index da541c3..0264d5f 100644
> --- a/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
> +++ b/Documentation/devicetree/bindings/mmc/arasan,sdhci.txt
> @@ -1,11 +1,12 @@
>  Device Tree Bindings for the Arasan SDHCI Controller
>  
> -  The bindings follow the mmc[1], clock[2] and interrupt[3] bindings. Only
> -  deviations are documented here.
> +  The bindings follow the mmc[1], clock[2], interrupt[3] and phy[4] bindings.
> +  Only deviations are documented here.
>  
>    [1] Documentation/devicetree/bindings/mmc/mmc.txt
>    [2] Documentation/devicetree/bindings/clock/clock-bindings.txt
>    [3] Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
> +  [4] Documentation/devicetree/bindings/phy/phy-bindings.txt
>  
>  Required Properties:
>    - compatible: Compatibility string. Must be 'arasan,sdhci-8.9a' or
> @@ -16,6 +17,9 @@ Required Properties:
>    - interrupts: Interrupt specifier
>    - interrupt-parent: Phandle for the interrupt controller that services
>  		      interrupts for this device.
> +Optional Properties:
> +  - phys: From PHY bindings: Phandle for the Generic PHY for arasan.
> +  - phy-names:  MUST be "phy_arasan".

This might be a dumb question, but, is the external phy actually
optional? Or is it mandatory for certain implementations of the IP.
In the latter case, it should probably be a mandatory property depending
on the compatible string matching an implementation that requires an
external phy (accordingly, the implementation might have to treat it
that way too).

	Sören
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