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Date: Mon, 4 Aug 2014 18:33:04 -0000
From: ygardi@...eaurora.org
To: "Kishon Vijay Abraham I" <kishon@...com>
Cc: "Yaniv Gardi" <ygardi@...eaurora.org>, linux-arm-msm@...r.kernel,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
noag@...eaurora.org, subhashj@...eaurora.org
Subject: Re: [PATCH v1] phy: extend APIs of the generic phy framework
> Hi,
>
> On Thursday 31 July 2014 06:07 PM, Yaniv Gardi wrote:
>> This change adds a few more APIs to the phy_ops structure:
>> advertise_quirks - API for setting the phy quirks
>
> What are these phy quirks? An explanation on what you are are planning to
> do
> with these quirks might help.
A phy HW might have a specific behavior that should be exposed to the phy
SW structure by calling this callback. This is the reason behind this
callback. does it make more sense now ?
>> suspend - API for the implementation of phy suspend sequence
>> resume - API for the implementation of phy resume sequence
>
> Why not use the existing pm_runtime's suspend/resume callbacks?
>
Like we observed in our case, often there are need to be extra operations
in the suspend/resume sequence. those specific operations include turning
off/on specific clocks, disabling/enabling regulators etc. the specific
implementation must give enough flexibility to add whatever needed to be
done in suspend/resume sequences.
>>
>> Change-Id: I44dd77f2603d20acb02ccb0cc0d20ade884f97c2
> Remove this..
>
>> Signed-off-by: Yaniv Gardi <ygardi@...eaurora.org>
>> ---
>> Documentation/phy.txt | 6 ++---
>> drivers/phy/phy-core.c | 58
>> +++++++++++++++++++++++++++++++++++++++++++++++++
>> include/linux/phy/phy.h | 33 ++++++++++++++++++++++++++++
>> 3 files changed, 94 insertions(+), 3 deletions(-)
>>
>> diff --git a/Documentation/phy.txt b/Documentation/phy.txt
>> index c6594af..f0dc28e 100644
>> --- a/Documentation/phy.txt
>> +++ b/Documentation/phy.txt
>> @@ -63,9 +63,9 @@ struct phy *devm_phy_create(struct device *dev, struct
>> device_node *node,
>> The PHY drivers can use one of the above 2 APIs to create the PHY by
>> passing
>> the device pointer, phy ops and init_data.
>> phy_ops is a set of function pointers for performing PHY operations
>> such as
>> -init, exit, power_on and power_off. *init_data* is mandatory to get a
>> reference
>> -to the PHY in the case of non-dt boot. See section *Board File
>> Initialization*
>> -on how init_data should be used.
>> +init, exit, power_on and power_off, , suspend, resume and
>> advertise_quirks.
>> +*init_data* is mandatory to get a reference to the PHY in the case of
>> non-dt
>> +boot. See section *Board File Initialization* on how init_data should
>> be used.
>>
>> Inorder to dereference the private data (in phy_ops), the phy provider
>> driver
>> can use phy_set_drvdata() after creating the PHY and use
>> phy_get_drvdata() in
>> diff --git a/drivers/phy/phy-core.c b/drivers/phy/phy-core.c
>> index ff5eec5..77abaab 100644
>> --- a/drivers/phy/phy-core.c
>> +++ b/drivers/phy/phy-core.c
>> @@ -293,6 +293,64 @@ int phy_power_off(struct phy *phy)
>> }
>> EXPORT_SYMBOL_GPL(phy_power_off);
>>
>> +int phy_suspend(struct phy *phy)
>> +{
>> + int ret = 0;
>> +
>> + if (!phy->ops->suspend)
>> + return -ENOTSUPP;
>> +
>> + mutex_lock(&phy->mutex);
>> +
>> + if (--phy->resume_count == 0) {
>> + ret = phy->ops->suspend(phy);
>> + if (ret) {
>> + dev_err(&phy->dev, "phy suspend failed --> %d\n", ret);
>> + /* reverting the resume_count since suspend failed */
>> + phy->resume_count++;
>> + goto out;
>> + }
>> + }
>> +out:
>> + mutex_unlock(&phy->mutex);
>> + return ret;
>> +}
>> +EXPORT_SYMBOL(phy_suspend);
>> +
>> +int phy_resume(struct phy *phy)
>> +{
>> + int ret = 0;
>> +
>> + if (!phy->ops->resume)
>> + return -ENOTSUPP;
>> +
>> + mutex_lock(&phy->mutex);
>> +
>> + if (phy->resume_count++ == 0) {
>> + ret = phy->ops->resume(phy);
>> + if (ret) {
>> + dev_err(&phy->dev, "phy resume failed --> %d\n", ret);
>> + /* reverting the resume_count since resume failed */
>> + phy->resume_count--;
>> + goto out;
>> + }
>> + }
>> +out:
>> + mutex_unlock(&phy->mutex);
>> + return ret;
>> +}
>> +EXPORT_SYMBOL(phy_resume);
>> +
>> +void phy_advertise_quirks(struct phy *phy)
>> +{
>> + if (phy->ops->advertise_quirks) {
>> + mutex_lock(&phy->mutex);
>> + phy->ops->advertise_quirks(phy);
>> + mutex_unlock(&phy->mutex);
>> + }
>> +}
>> +EXPORT_SYMBOL(phy_advertise_quirks);
>> +
>> /**
>> * _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 8cb6f81..5b96d65 100644
>> --- a/include/linux/phy/phy.h
>> +++ b/include/linux/phy/phy.h
>> @@ -28,6 +28,14 @@ struct phy;
>> * @exit: operation to be performed while exiting
>> * @power_on: powering on the phy
>> * @power_off: powering off the phy
>> + * @advertise_quirks: setting specific phy quirks. this api is for an
>> + internal use of the device driver, and its
>> + purpose is to exteriorize the driver's phy quirks
>> + according to phy version (or other parameters),
>> + so further behaviour of the driver's phy is based
>> + on those quirks.
>
> Can you be more specific on what you do with this? This looks more like a
> candidate for flags than callback to me?
>
> Thanks
> Kishon
>
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