linux-kernel - Re: [PATCH v4 1/5] mfd: omap-usb-host: Update DT clock binding information

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Message-ID: <20140108095652.GD6701@e106331-lin.cambridge.arm.com>
Date:	Wed, 8 Jan 2014 09:56:52 +0000
From:	Mark Rutland <mark.rutland@....com>
To:	Roger Quadros <rogerq@...com>
Cc:	"bcousson@...libre.com" <bcousson@...libre.com>,
	"tony@...mide.com" <tony@...mide.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	"arnd@...db.de" <arnd@...db.de>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"balbi@...com" <balbi@...com>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	Lee Jones <lee.jones@...aro.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v4 1/5] mfd: omap-usb-host: Update DT clock binding
 information

On Wed, Jan 08, 2014 at 06:15:38AM +0000, Roger Quadros wrote:
> The omap-usb-host driver expects the 60MHz functional clock
> of the USB host module to be named as "init_60m_fclk".
> Add this information in the DT binding document.
> 
> CC: Lee Jones <lee.jones@...aro.org>
> CC: Samuel Ortiz <sameo@...ux.intel.com>
> Signed-off-by: Roger Quadros <rogerq@...com>
> ---
>  Documentation/devicetree/bindings/mfd/omap-usb-host.txt | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/mfd/omap-usb-host.txt b/Documentation/devicetree/bindings/mfd/omap-usb-host.txt
> index b381fa6..5635202 100644
> --- a/Documentation/devicetree/bindings/mfd/omap-usb-host.txt
> +++ b/Documentation/devicetree/bindings/mfd/omap-usb-host.txt
> @@ -32,6 +32,10 @@ Optional properties:
>  - single-ulpi-bypass: Must be present if the controller contains a single
>    ULPI bypass control bit. e.g. OMAP3 silicon <= ES2.1
>  
> +- clocks: phandle to 60MHz functional clock to the USB Host module.
> +
> +- clock-names: must be "init_60m_fclk"
> +

Nit: clocks aren't just phandles, there's a clock-specifier too.

Also, it would be nicer if clocks was defined in terms of clock-names,
as it makes the relationship between clocks and clock-names clear, and
makes it easier to extend the list in future. Something like:

- clocks: a list of phandles + clock-specifiers, one for each entry in
  clock-names

- clock-names: should include:
  * "init_60m_fclk" - the 60MHz functional clock to the USB host module.

Thanks,
Mark.
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