linux-kernel - Re: [PATCH RESEND v2 1/2] phy: core: Add an exported of_phy

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Date:	Fri, 13 Dec 2013 20:15:09 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	Kamil Debski <k.debski@...sung.com>,
	<linux-kernel@...r.kernel.org>,
	<linux-samsung-soc@...r.kernel.org>, <linux-usb@...r.kernel.org>,
	<devicetree@...r.kernel.org>
CC:	<t.figa@...sung.com>, <m.szyprowski@...sung.com>,
	<gautam.vivek@...sung.com>, <matt.porter@...aro.org>
Subject: Re: [PATCH RESEND v2 1/2] phy: core: Add an exported of_phy_get function

Hi,

On Friday 13 December 2013 07:32 PM, Kamil Debski wrote:
> Previously the of_phy_get function took a struct device * and
> was declared static. It was impossible to call it from
> another driver and thus it was impossible to get phy defined
> for a given node. The old function was renamed to _of_phy_get
> and was left for internal use. of_phy_get function was added
> and it was exported. The function enables to get a phy for
> a given device tree node.
> 
> Signed-off-by: Kamil Debski <k.debski@...sung.com>
> ---
> It seems that my git send-email is playing up and sent the previous emails
> without from. This is a resend. Sorry for any confusion.
> ---
>  drivers/phy/phy-core.c  |   41 ++++++++++++++++++++++++++++++++---------
>  include/linux/phy/phy.h |    1 +
>  2 files changed, 33 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/phy/phy-core.c b/drivers/phy/phy-core.c
> index 03cf8fb..f0dbd42 100644
> --- a/drivers/phy/phy-core.c
> +++ b/drivers/phy/phy-core.c
> @@ -240,8 +240,8 @@ out:
>  EXPORT_SYMBOL_GPL(phy_power_off);
>  
>  /**
> - * of_phy_get() - lookup and obtain a reference to a phy by phandle
> - * @dev: device that requests this phy
> + * _of_phy_get() - lookup and obtain a reference to a phy by phandle
> + * @np: device_node for which to get the phy
>   * @index: the index of the phy
>   *
>   * Returns the phy associated with the given phandle value,
> @@ -250,20 +250,17 @@ EXPORT_SYMBOL_GPL(phy_power_off);
>   * not yet loaded. This function uses of_xlate call back function provided
>   * while registering the phy_provider to find the phy instance.
>   */
> -static struct phy *of_phy_get(struct device *dev, int index)
> +static struct phy *_of_phy_get(struct device_node *np, int index)
>  {
>  	int ret;
>  	struct phy_provider *phy_provider;
>  	struct phy *phy = NULL;
>  	struct of_phandle_args args;
>  
> -	ret = of_parse_phandle_with_args(dev->of_node, "phys", "#phy-cells",
> +	ret = of_parse_phandle_with_args(np, "phys", "#phy-cells",
>  		index, &args);
> -	if (ret) {
> -		dev_dbg(dev, "failed to get phy in %s node\n",
> -			dev->of_node->full_name);
> +	if (ret)
>  		return ERR_PTR(-ENODEV);
> -	}
>  
>  	mutex_lock(&phy_provider_mutex);
>  	phy_provider = of_phy_provider_lookup(args.np);
> @@ -283,6 +280,32 @@ err0:
>  }
>  
>  /**
> + * of_phy_get() - lookup and obtain a reference to a phy using a device_node.
> + * @np: device_node for which to get the phy
> + * @index: the index of the phy

Would be better if the user can get the PHY by string instead of index.
> + *
> + * Returns the phy driver, after getting a refcount to it; or
> + * -ENODEV if there is no such phy.  The caller is responsible for
> + * calling phy_put() to release that count.
> + */
> +struct phy *of_phy_get(struct device_node *np, int index)
> +{
> +	struct phy *phy = NULL;
> +
> +	phy = _of_phy_get(np, index);
> +	if (IS_ERR(phy))
dev_err here?

Thanks
Kishon
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