linux-kernel - Re: [PATCH v3 1/9] phy: add phy_get_bus_width()/phy_set_bus

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Date:	Tue, 26 Nov 2013 15:46:26 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	Matt Porter <matt.porter@...aro.org>, Felipe Balbi <balbi@...com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	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>
CC:	Tomasz Figa <t.figa@...sung.com>,
	Kamil Debski <k.debski@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Linux USB List <linux-usb@...r.kernel.org>,
	Linux ARM Kernel List <linux-arm-kernel@...ts.infradead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Devicetree List <devicetree@...r.kernel.org>,
	Linaro Patches <patches@...aro.org>
Subject: Re: [PATCH v3 1/9] phy: add phy_get_bus_width()/phy_set_bus_width()
 calls

Hi,

On Monday 25 November 2013 11:45 PM, Matt Porter wrote:
> This adds a pair of APIs that allows the generic PHY subsystem to
> provide information on the PHY bus width. The PHY provider driver may
> use phy_set_bus_width() to set the bus width that the PHY supports.
> The controller driver may then use phy_get_bus_width() to fetch the
> PHY bus width in order to properly configure the controller.
> 
> Signed-off-by: Matt Porter <matt.porter@...aro.org>
> ---
>  include/linux/phy/phy.h | 20 ++++++++++++++++++++
>  1 file changed, 20 insertions(+)
> 
> diff --git a/include/linux/phy/phy.h b/include/linux/phy/phy.h
> index 6d72269..6ca6c61 100644
> --- a/include/linux/phy/phy.h
> +++ b/include/linux/phy/phy.h
> @@ -46,6 +46,7 @@ struct phy_ops {
>   * @mutex: mutex to protect phy_ops
>   * @init_count: used to protect when the PHY is used by multiple consumers
>   * @power_count: used to protect when the PHY is used by multiple consumers
> + * @bus_width: used to specify data width of the PHY bus
>   */
>  struct phy {
>  	struct device		dev;
> @@ -55,6 +56,7 @@ struct phy {
>  	struct mutex		mutex;
>  	int			init_count;
>  	int			power_count;
> +	int			bus_width;

the bus_width can be part of the attrs struct which you initially proposed.
Soon there will be requests for other attributes being added (e.g., speed).
>  };
>  
>  /**
> @@ -127,6 +129,14 @@ int phy_init(struct phy *phy);
>  int phy_exit(struct phy *phy);
>  int phy_power_on(struct phy *phy);
>  int phy_power_off(struct phy *phy);
> +static inline int phy_get_bus_width(struct phy *phy)
> +{
> +	return phy->bus_width;
> +}
> +static inline void phy_set_bus_width(struct phy *phy, int bus_width)

u32 bus_width?
> +{
> +	phy->bus_width = bus_width;
> +}
>  struct phy *phy_get(struct device *dev, const char *string);
>  struct phy *devm_phy_get(struct device *dev, const char *string);
>  void phy_put(struct phy *phy);
> @@ -199,6 +209,16 @@ static inline int phy_power_off(struct phy *phy)
>  	return -ENOSYS;
>  }
>  
> +static inline int phy_get_bus_width(struct phy *phy)
> +{
> +	return -ENOSYS;
> +}
> +
> +static inline void phy_set_bus_width(struct phy *phy, bus_width)

er.. has this been compile tested?

Thanks
Kishon
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