linux-kernel - Re: [PATCH v5 3/7] phy: Add set

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Date:	Mon, 4 Jul 2016 18:22:10 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	David Lechner <david@...hnology.com>, <nsekhar@...com>,
	Bin Liu <b-liu@...com>
CC:	<khilman@...nel.org>, 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>,
	Alan Stern <stern@...land.harvard.edu>,
	Lee Jones <lee.jones@...aro.org>, <petr@...ix.com>,
	<sergei.shtylyov@...entembedded.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-usb@...r.kernel.org>
Subject: Re: [PATCH v5 3/7] phy: Add set_mode callback

Hi Bin,

On Monday 27 June 2016 06:17 PM, Kishon Vijay Abraham I wrote:
> Hi,
> 
> On Tuesday 10 May 2016 05:09 AM, David Lechner wrote:
>> The initial use for this is for PHYs that have a mode related to USB OTG.
>> There are several SoCs (e.g. TI OMAP and DA8xx) that have a mode setting
>> in the USB PHY to override OTG VBUS and ID signals.
>>
>> Of course, the enum can be expaned in the future to include modes for
>> other types of PHYs as well.
>>
>> Suggested-by: Kishon Vijay Abraham I <kishon@...com>
>> Signed-off-by: David Lechner <david@...hnology.com>
> 
> I've created a immutable branch for this patch and it can be found here.
> git://git.kernel.org/pub/scm/linux/kernel/git/kishon/linux-phy.git
> tags/phy-set-mode

There was a build error in the above tag with allyesconfig. So I have created a
new tag which includes the fix patch in addition to this patch.

new tag:
tags/phy-set-mode-v2

In the patches you sent to Greg [1], I didn't see this series included. However
if you are planning to send another pull request for the next merge window,
request you to use the new tag.

Thanks
Kishon

[1] -> http://www.spinics.net/lists/linux-usb/msg142788.html
> 
> I've merged this tag to my -next.
> 
> Thanks
> Kishon
> 
>> ---
>>  drivers/phy/phy-core.c  | 15 +++++++++++++++
>>  include/linux/phy/phy.h | 17 +++++++++++++++++
>>  2 files changed, 32 insertions(+)
>>
>> diff --git a/drivers/phy/phy-core.c b/drivers/phy/phy-core.c
>> index e7e574d..fe0344c 100644
>> --- a/drivers/phy/phy-core.c
>> +++ b/drivers/phy/phy-core.c
>> @@ -342,6 +342,21 @@ int phy_power_off(struct phy *phy)
>>  }
>>  EXPORT_SYMBOL_GPL(phy_power_off);
>>  
>> +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);
>> +
>>  /**
>>   * _of_phy_get() - lookup and obtain a reference to a phy by phandle
>>   * @np: device_node for which to get the phy
>> diff --git a/include/linux/phy/phy.h b/include/linux/phy/phy.h
>> index 8cf05e3..4248ade 100644
>> --- a/include/linux/phy/phy.h
>> +++ b/include/linux/phy/phy.h
>> @@ -22,12 +22,20 @@
>>  
>>  struct phy;
>>  
>> +enum phy_mode {
>> +	PHY_MODE_INVALID,
>> +	PHY_MODE_USB_HOST,
>> +	PHY_MODE_USB_DEVICE,
>> +	PHY_MODE_USB_OTG,
>> +};
>> +
>>  /**
>>   * struct phy_ops - set of function pointers for performing phy operations
>>   * @init: operation to be performed for initializing phy
>>   * @exit: operation to be performed while exiting
>>   * @power_on: powering on the phy
>>   * @power_off: powering off the phy
>> + * @set_mode: set the mode of the phy
>>   * @owner: the module owner containing the ops
>>   */
>>  struct phy_ops {
>> @@ -35,6 +43,7 @@ struct phy_ops {
>>  	int	(*exit)(struct phy *phy);
>>  	int	(*power_on)(struct phy *phy);
>>  	int	(*power_off)(struct phy *phy);
>> +	int	(*set_mode)(struct phy *phy, enum phy_mode mode);
>>  	struct module *owner;
>>  };
>>  
>> @@ -119,6 +128,7 @@ 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);
>> +int phy_set_mode(struct phy *phy, enum phy_mode mode);
>>  static inline int phy_get_bus_width(struct phy *phy)
>>  {
>>  	return phy->attrs.bus_width;
>> @@ -224,6 +234,13 @@ static inline int phy_power_off(struct phy *phy)
>>  	return -ENOSYS;
>>  }
>>  
>> +static inline int phy_set_mode(struct phy *phy, enum phy_mode mode)
>> +{
>> +	if (!phy)
>> +		return 0;
>> +	return -ENOSYS;
>> +}
>> +
>>  static inline int phy_get_bus_width(struct phy *phy)
>>  {
>>  	return -ENOSYS;
>>