Re: [RFC PATCH 3/4] extcon: add possibility to get extcon device by of node

Chanwoo Choi
2017-10-18T06:59:19Z

Hi,

On 2017년 09월 28일 22:07, Andrzej Hajda wrote:
> Since extcon property is not allowed in DT, extcon subsystem requires
> another way to get extcon device. Lets try the simplest approach - get
> edev by of_node.
>
> Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
> ---
> drivers/extcon/extcon.c | 44 ++++++++++++++++++++++++++++++++++----------
> include/linux/extcon.h | 6 ++++++
> 2 files changed, 40 insertions(+), 10 deletions(-)

Looks good to me. Just I added the minor comment.
Acked-by: Chanwoo Choi <cw00.choi@samsung.com>

>
> diff --git a/drivers/extcon/extcon.c b/drivers/extcon/extcon.c
> index cb38c2747684..fdb8c1d767c1 100644
> --- a/drivers/extcon/extcon.c
> +++ b/drivers/extcon/extcon.c
> @@ -1336,6 +1336,28 @@ void extcon_dev_unregister(struct extcon_dev *edev)
> EXPORT_SYMBOL_GPL(extcon_dev_unregister);
>
> #ifdef CONFIG_OF
> +
> +/*
> + * extcon_get_edev_by_of_node - Get the extcon device from devicetree.
> + * @node : OF node identyfying edev
> + *
> + * Return the pointer of extcon device if success or ERR_PTR(err) if fail.
> + */
> +struct extcon_dev *extcon_get_edev_by_of_node(struct device_node *node)
> +{
> + struct extcon_dev *edev;
> +
> + mutex_lock(&extcon_dev_list_lock);
> + list_for_each_entry(edev, &extcon_dev_list, entry)
> + if (edev->dev.parent && edev->dev.parent->of_node == node)
> + goto end;
> + edev = ERR_PTR(-EPROBE_DEFER);
> +end:

The extcon.c already use the 'out' statement for goto.
I'd like you to use 'out' instead of 'end'.

> + mutex_unlock(&extcon_dev_list_lock);
> +
> + return edev;
> +}
> +
> /*
> * extcon_get_edev_by_phandle - Get the extcon device from devicetree.
> * @dev : the instance to the given device
> @@ -1363,25 +1385,27 @@ struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index)
> return ERR_PTR(-ENODEV);
> }
>
> - mutex_lock(&extcon_dev_list_lock);
> - list_for_each_entry(edev, &extcon_dev_list, entry) {
> - if (edev->dev.parent && edev->dev.parent->of_node == node) {
> - mutex_unlock(&extcon_dev_list_lock);
> - of_node_put(node);
> - return edev;
> - }
> - }
> - mutex_unlock(&extcon_dev_list_lock);
> + edev = extcon_get_edev_by_of_node(node);
> of_node_put(node);
>
> - return ERR_PTR(-EPROBE_DEFER);
> + return edev;
> }
> +
> #else
> +
> +struct extcon_dev *extcon_get_edev_by_of_node(struct device_node *node)
> +{
> + return ERR_PTR(-ENOSYS);
> +}
> +
> struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index)
> {
> return ERR_PTR(-ENOSYS);
> }
> +
> #endif /* CONFIG_OF */
> +
> +EXPORT_SYMBOL_GPL(extcon_get_edev_by_of_node);
> EXPORT_SYMBOL_GPL(extcon_get_edev_by_phandle);
>
> /**
> diff --git a/include/linux/extcon.h b/include/linux/extcon.h
> index 744d60ca80c3..2f88e7491672 100644
> --- a/include/linux/extcon.h
> +++ b/include/linux/extcon.h
> @@ -261,6 +261,7 @@ extern void devm_extcon_unregister_notifier_all(struct device *dev,
> * Following APIs get the extcon_dev from devicetree or by through extcon name.
> */
> extern struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name);
> +extern struct extcon_dev *extcon_get_edev_by_of_node(struct device_node *node);
> extern struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev,
> int index);
>
> @@ -382,6 +383,11 @@ static inline struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name)
> return ERR_PTR(-ENODEV);
> }
>
> +static inline struct extcon_dev *extcon_get_edev_by_of_node(struct device_node *node)
> +{
> + return ERR_PTR(-ENODEV);
> +}
> +
> static inline struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev,
> int index)
> {
>

--
Best Regards,
Chanwoo Choi
Samsung Electronics