linux-kernel - Re: [PATCH v2 06/11] phy: da8xx-usb: new driver for DA8XX SoC USB PHY

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Date:	Thu, 14 Apr 2016 18:02:15 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	David Lechner <david@...hnology.com>
CC:	Petr Kulhavy <petr@...ix.com>, Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	Sekhar Nori <nsekhar@...com>,
	Kevin Hilman <khilman@...nel.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Bin Liu <b-liu@...com>,
	Andreas Färber <afaerber@...e.de>,
	Tony Lindgren <tony@...mide.com>,
	Robert Jarzmik <robert.jarzmik@...e.fr>,
	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-usb@...r.kernel.org>
Subject: Re: [PATCH v2 06/11] phy: da8xx-usb: new driver for DA8XX SoC USB PHY

Hi,

On Thursday 14 April 2016 02:21 AM, David Lechner wrote:
> On 04/01/2016 08:16 AM, Kishon Vijay Abraham I wrote:
> 
>>> +EXPORT_SYMBOL_GPL(da8xx_usb20_phy_set_mode);
>>
>> Don't prefer export symbols from PHY driver. That'll create unnecessary
>> dependencies between the controller and the PHY.
>>
>> I think it'll be better to create a new attribute and use it?
>>
> 
> Just having an attribute that keeps track of state does not work. I need a
> callback to poke registers. Would this be acceptable instead?
> 
> -----8<------
> diff --git a/drivers/phy/phy-core.c b/drivers/phy/phy-core.c
> index e7e574d..a13c7e4 100644
> --- a/drivers/phy/phy-core.c
> +++ b/drivers/phy/phy-core.c
> @@ -342,6 +342,36 @@ int phy_power_off(struct phy *phy)
>  }
>  EXPORT_SYMBOL_GPL(phy_power_off);
> 
> +int phy_get_mode(struct phy *phy, enum phy_mode *mode)
> +{
> +       int ret;
> +
> +       if (!phy || !phy->ops->get_mode)
> +               return 0;
> +
> +       mutex_lock(&phy->mutex);
> +       ret = phy->ops->get_mode(phy, mode);
> +       mutex_unlock(&phy->mutex);
> +
> +       return ret;
> +}
> +EXPORT_SYMBOL_GPL(phy_get_mode);

'ops' for get_mode doesn't make much sense.
> +
> +int phy_set_mode(struct phy *phy, enum phy_mode mode)
> +{
> +       int ret;
> +
> +       if (!phy || !phy->ops->set_mode)
> +               return 0;
> +
> +       mutex_lock(&phy->mutex);
> +       ret = phy->ops->set_mode(phy, mode);
> +       mutex_unlock(&phy->mutex);
> +
> +       return ret;
> +}
> +EXPORT_SYMBOL_GPL(phy_set_mode);

this should be fine.

Thanks
Kishon