Re: [PATCH 2/9] PM / devfreq: Remove devfreq_get_devfreq_by_phandle function

Leonard Crestez
2019-12-17T14:33:59Z

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@samsung.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?

> +
> 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;
>