Re: [PATCH 9/9] regulator: map consumer regulator based on device tree

[Grant Likely <grant.likely-s3s/WqlpOiPyB63q8FvJNQ@public.gmane.org>]

On Tue, Sep 27, 2011 at 03:42:52PM +0530, Rajendra Nayak wrote:
> Look up the regulator for a given consumer from device tree, during
> a regulator_get(). If not found fallback and lookup through
> the regulator_map_list instead.
> 
> Devices can associate with one or more regulators by providing a
> list of phandles and supply names.
> 
> For Example:
>         devicenode: node@0x0 {
>                 ...
>                 ...
>                 vmmc-supply = <&regulator1>;
>                 vpll-supply = <&regulator2>;
>         };
> 
> When a device driver calls a regulator_get, specifying the
> supply name, the phandle and eventually the regulator node
> is extracted from the device node.
> 
> Signed-off-by: Rajendra Nayak <rnayak-l0cyMroinI0@public.gmane.org>
> ---
>  drivers/regulator/core.c         |   14 ++++++++++++++
>  include/linux/regulator/driver.h |    3 +++
>  2 files changed, 17 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
> index d8e6a42..47b851c 100644
> --- a/drivers/regulator/core.c
> +++ b/drivers/regulator/core.c
> @@ -25,9 +25,11 @@
>  #include <linux/mutex.h>
>  #include <linux/suspend.h>
>  #include <linux/delay.h>
> +#include <linux/of.h>
>  #include <linux/regulator/consumer.h>
>  #include <linux/regulator/driver.h>
>  #include <linux/regulator/machine.h>
> +#include <linux/regulator/of_regulator.h>
>  
>  #define CREATE_TRACE_POINTS
>  #include <trace/events/regulator.h>
> @@ -1155,6 +1157,7 @@ static struct regulator *_regulator_get(struct device *dev, const char *id,
>  	struct regulator_map *map;
>  	struct regulator *regulator = ERR_PTR(-ENODEV);
>  	const char *devname = NULL;
> +	struct device_node *node;
>  	int ret;
>  
>  	if (id == NULL) {
> @@ -1167,6 +1170,15 @@ static struct regulator *_regulator_get(struct device *dev, const char *id,
>  
>  	mutex_lock(&regulator_list_mutex);
>  
> +	if (dev->of_node) {
> +		node = of_get_regulator(dev, id);
> +		if (!node)
> +			goto retry; /* fallback and chk regulator_map_list */
> +		list_for_each_entry(rdev, &regulator_list, list)
> +			if (node == rdev->node)
> +				goto found;
> +	}
> +retry:
>  	list_for_each_entry(map, &regulator_map_list, list) {
>  		/* If the mapping has a device set up it must match */
>  		if (map->dev_name &&
> @@ -2619,6 +2631,8 @@ struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc,
>  	rdev->reg_data = driver_data;
>  	rdev->owner = regulator_desc->owner;
>  	rdev->desc = regulator_desc;
> +	if (dev && dev->of_node)
> +		rdev->node = dev->of_node;
>  	INIT_LIST_HEAD(&rdev->consumer_list);
>  	INIT_LIST_HEAD(&rdev->list);
>  	BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
> diff --git a/include/linux/regulator/driver.h b/include/linux/regulator/driver.h
> index 1a80bc7..4aebbf5 100644
> --- a/include/linux/regulator/driver.h
> +++ b/include/linux/regulator/driver.h
> @@ -196,6 +196,9 @@ struct regulator_dev {
>  	struct mutex mutex; /* consumer lock */
>  	struct module *owner;
>  	struct device dev;
> +#ifdef CONFIG_OF
> +	struct device_node *node;
> +#endif

There is already an of_node pointer in regulator_dev->dev.of_node.
Why does another need to be added here?

g.