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Date: Wed, 18 Dec 2019 11:59:31 +0900
From: Chanwoo Choi <cw00.choi@...sung.com>
To: Leonard Crestez <leonard.crestez@....com>,
"krzk@...nel.org" <krzk@...nel.org>,
"robh+dt@...nel.org" <robh+dt@...nel.org>
Cc: "mark.rutland@....com" <mark.rutland@....com>,
"heiko@...ech.de" <heiko@...ech.de>,
"lukasz.luba@....com" <lukasz.luba@....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 2/9] PM / devfreq: Remove devfreq_get_devfreq_by_phandle
function
On 12/17/19 11:33 PM, Leonard Crestez wrote:
> On 17.12.2019 07:51, 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 | 14 ++++++++++++--
>> include/linux/devfreq.h | 8 --------
>> 3 files changed, 12 insertions(+), 45 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..9aac2db956d5 100644
>> --- a/drivers/devfreq/exynos-bus.c
>> +++ b/drivers/devfreq/exynos-bus.c
>> @@ -146,6 +146,16 @@ static int exynos_bus_get_dev_status(struct device *dev,
>> return ret;
>> }
>>
>> +static struct devfreq *get_parent_devfreq_by_node(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);
>> +}
>
> The _by_node suffix here is confusing because it actually fetches a
> property of the node unlike devfreq_get_devfreq_by_node. Maybe call this
> get_parent_devfreq_from_node?
>
> Since it's a static function it could just be called get_parent_devfreq?
OK.
>
>> +
>> static void exynos_bus_exit(struct device *dev)
>> {
>> struct exynos_bus *bus = dev_get_drvdata(dev);
>> @@ -353,8 +363,8 @@ 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);
>> - if (IS_ERR(parent_devfreq))
>> + parent_devfreq = get_parent_devfreq_by_node(dev->of_node);
>> + if (IS_ERR(parent_devfreq)) {
>> return -EPROBE_DEFER;
>>
>> passive_data = devm_kzalloc(dev, sizeof(*passive_data), GFP_KERNEL);
>> diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h
>> index e3633ae43349..3ed96426302e 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 @@ struct devfreq *devfreq_get_devfreq_by_node(struct device_node *node)
>> 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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