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Date: Fri, 20 Dec 2019 11:14:29 +0900
From: Chanwoo Choi <cw00.choi@...sung.com>
To: Leonard Crestez <leonard.crestez@....com>,
"krzk@...nel.org" <krzk@...nel.org>
Cc: "robh+dt@...nel.org" <robh+dt@...nel.org>,
"heiko@...ech.de" <heiko@...ech.de>,
"lukasz.luba@....com" <lukasz.luba@....com>,
"mark.rutland@....com" <mark.rutland@....com>,
"a.swigon@...sung.com" <a.swigon@...sung.com>,
"m.szyprowski@...sung.com" <m.szyprowski@...sung.com>,
"kgene@...nel.org" <kgene@...nel.org>,
"myungjoo.ham@...sung.com" <myungjoo.ham@...sung.com>,
"kyungmin.park@...sung.com" <kyungmin.park@...sung.com>,
"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
"linux-samsung-soc@...r.kernel.org"
<linux-samsung-soc@...r.kernel.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-rockchip@...ts.infradead.org"
<linux-rockchip@...ts.infradead.org>
Subject: Re: [PATCH v2 02/11] PM / devfreq: Remove
devfreq_get_devfreq_by_phandle function
On 12/20/19 10:40 AM, Leonard Crestez wrote:
> On 2019-12-20 2:54 AM, Chanwoo Choi wrote:
>> On 12/20/19 9:46 AM, Leonard Crestez wrote:
>>> On 20.12.2019 02:18, Chanwoo Choi wrote:
>>>> Previously, devfreq core support 'devfreq' property in order to get
>>>> the devfreq device by phandle. But, 'devfreq' property name is not proper
>>>> on devicetree binding because this name doesn't mean the any h/w attribute.
>>>>
>>>> The devfreq core hand over the right to decide the property name
>>>> for getting the devfreq device on devicetree. Each devfreq driver
>>>> will decide the property name on devicetree binding and then get
>>>> the devfreq device by using devfreq_get_devfreq_by_node().
>>>>
>>>> Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>
>>>> ---
>>>> drivers/devfreq/devfreq.c | 35 -----------------------------------
>>>> drivers/devfreq/exynos-bus.c | 12 +++++++++++-
>>>> include/linux/devfreq.h | 8 --------
>>>> 3 files changed, 11 insertions(+), 44 deletions(-)
>>>>
>>>> diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
>>>> index cb8ca81c8973..c3d3c7c802a0 100644
>>>> --- a/drivers/devfreq/devfreq.c
>>>> +++ b/drivers/devfreq/devfreq.c
>>>> @@ -991,48 +991,13 @@ struct devfreq *devfreq_get_devfreq_by_node(struct device_node *node)
>>>>
>>>> return ERR_PTR(-ENODEV);
>>>> }
>>>> -
>>>> -/*
>>>> - * devfreq_get_devfreq_by_phandle - Get the devfreq device from devicetree
>>>> - * @dev - instance to the given device
>>>> - * @index - index into list of devfreq
>>>> - *
>>>> - * return the instance of devfreq device
>>>> - */
>>>> -struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev, int index)
>>>> -{
>>>> - struct device_node *node;
>>>> - struct devfreq *devfreq;
>>>> -
>>>> - if (!dev)
>>>> - return ERR_PTR(-EINVAL);
>>>> -
>>>> - if (!dev->of_node)
>>>> - return ERR_PTR(-EINVAL);
>>>> -
>>>> - node = of_parse_phandle(dev->of_node, "devfreq", index);
>>>> - if (!node)
>>>> - return ERR_PTR(-ENODEV);
>>>> -
>>>> - devfreq = devfreq_get_devfreq_by_node(node);
>>>> - of_node_put(node);
>>>> -
>>>> - return devfreq;
>>>> -}
>>>> -
>>>> #else
>>>> struct devfreq *devfreq_get_devfreq_by_node(struct device_node *node)
>>>> {
>>>> return ERR_PTR(-ENODEV);
>>>> }
>>>> -
>>>> -struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev, int index)
>>>> -{
>>>> - return ERR_PTR(-ENODEV);
>>>> -}
>>>> #endif /* CONFIG_OF */
>>>> EXPORT_SYMBOL_GPL(devfreq_get_devfreq_by_node);
>>>> -EXPORT_SYMBOL_GPL(devfreq_get_devfreq_by_phandle);
>>>>
>>>> /**
>>>> * devm_devfreq_remove_device() - Resource-managed devfreq_remove_device()
>>>> diff --git a/drivers/devfreq/exynos-bus.c b/drivers/devfreq/exynos-bus.c
>>>> index 7f5917d59072..1bc4e3c81115 100644
>>>> --- a/drivers/devfreq/exynos-bus.c
>>>> +++ b/drivers/devfreq/exynos-bus.c
>>>> @@ -86,6 +86,16 @@ static int exynos_bus_get_event(struct exynos_bus *bus,
>>>> return ret;
>>>> }
>>>>
>>>> +static struct devfreq *exynos_bus_get_parent_devfreq(struct device_node *np)
>>>> +{
>>>> + struct device_node *node = of_parse_phandle(np, "devfreq", 0);
>>>> +
>>>> + if (!node)
>>>> + return ERR_PTR(-ENODEV);
>>>> +
>>>> + return devfreq_get_devfreq_by_node(node);
>>>
>>> You need to call of_node_put(node) here and in several other places.
>>>
>>> The old devfreq_get_devfreq_by_phandle API handled this internally but
>>> devfreq_get_devfreq_by_node doesn't.
>>
>> Thanks. I'll fix it.
>>
>>>
>>> Maybe the _by_phandle API could be kept and just take the property name
>>> instead of always using "devfreq"?
>>
>> Do you mean like below?
>> devfreq_get_devfreq_by_phandle(struct device *dev, int index)
>> -> devfreq_get_devfreq_by_phandle(struct device *dev, char *property_name, int index)
>>
>> In case of devfreq-event.c,
>> struct devfreq_event_dev *devfreq_event_get_edev_by_phandle(
>> struct device *dev,
>> char property_name,
>> int index)
>> int devfreq_event_get_edev_count(struct device *dev, char *property_name)
>
> Yes. These helpers would avoid the need for explicit of_node_put.
OK. Instead of removing devfreq_event_get_edev_by_phandle,
change the function property of devfreq_event_get_edev_by_phandle on v3.
After getting the review for dt-binding patch, I'll send v3 patches.
>
>>
>>>
>>>> +}
>>>> +
>>>> /*
>>>> * devfreq function for both simple-ondemand and passive governor
>>>> */
>>>> @@ -353,7 +363,7 @@ static int exynos_bus_profile_init_passive(struct exynos_bus *bus,
>>>> profile->exit = exynos_bus_passive_exit;
>>>>
>>>> /* Get the instance of parent devfreq device */
>>>> - parent_devfreq = devfreq_get_devfreq_by_phandle(dev, 0);
>>>> + parent_devfreq = exynos_bus_get_parent_devfreq(dev->of_node);
>>>> if (IS_ERR(parent_devfreq))
>>>> return -EPROBE_DEFER;
>>>>
>>>> diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h
>>>> index 1dccc47acbce..a4351698fb64 100644
>>>> --- a/include/linux/devfreq.h
>>>> +++ b/include/linux/devfreq.h
>>>> @@ -254,8 +254,6 @@ extern void devm_devfreq_unregister_notifier(struct device *dev,
>>>> struct notifier_block *nb,
>>>> unsigned int list);
>>>> extern struct devfreq *devfreq_get_devfreq_by_node(struct device_node *node);
>>>> -extern struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev,
>>>> - int index);
>>>>
>>>> #if IS_ENABLED(CONFIG_DEVFREQ_GOV_SIMPLE_ONDEMAND)
>>>> /**
>>>> @@ -413,12 +411,6 @@ static inline struct devfreq *devfreq_get_devfreq_by_node(struct device_node *no
>>>> return ERR_PTR(-ENODEV);
>>>> }
>>>>
>>>> -static inline struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev,
>>>> - int index)
>>>> -{
>>>> - return ERR_PTR(-ENODEV);
>>>> -}
>>>> -
>>>> static inline int devfreq_update_stats(struct devfreq *df)
>>>> {
>>>> return -EINVAL;
>
>
>
--
Best Regards,
Chanwoo Choi
Samsung Electronics
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