linux-kernel - Re: [PATCH v4 1/9] phy: add phy_get_bus_width()/phy_set_bus

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Date:	Thu, 12 Dec 2013 11:27:15 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Matt Porter <mporter@...aro.org>
Cc:	Felipe Balbi <balbi@...com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Kishon Vijay Abraham I <kishon@...com>,
	Rob Herring <rob.herring@...xeda.com>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Kumar Gala <galak@...eaurora.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Christian Daudt <bcm@...thebug.org>,
	Paul Zimmerman <paulz@...opsys.com>,
	Devicetree List <devicetree@...r.kernel.org>,
	Kamil Debski <k.debski@...sung.com>,
	Linaro Patches <patches@...aro.org>,
	Tomasz Figa <t.figa@...sung.com>,
	Linux USB List <linux-usb@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Linux ARM Kernel List <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v4 1/9] phy: add
	phy_get_bus_width()/phy_set_bus_width() calls

On Thu, Dec 12, 2013 at 06:18:29AM -0500, Matt Porter wrote:
>  /**
> + * struct phy_attrs - represents phy attributes
> + * @bus_width: Data path width implemented by PHY
> + */
> +struct phy_attrs {
> +	u32			bus_width;

Why u32?

>  int phy_power_off(struct phy *phy);
> +static inline u32 phy_get_bus_width(struct phy *phy)
> +{
> +	return phy->attrs.bus_width;
...
>  
> +static inline u32 phy_get_bus_width(struct phy *phy)
> +{
> +	return -ENOSYS;

Why u32, especially as you're returning a negative number here.

If the bus width is a small integer (I'm assuming you don't have up to
2^30 bus signals) then what's wrong with it being an 'int' ?
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