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Date: Fri, 20 Dec 2019 00:46:55 +0000
From: Leonard Crestez <leonard.crestez@....com>
To: Chanwoo Choi <cw00.choi@...sung.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 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.
Maybe the _by_phandle API could be kept and just take the property name
instead of always using "devfreq"?
> +}
> +
> /*
> * 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;
>
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