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    Subject[PATCH v3 4/4] regulator: map consumer regulator based on device tree
    Date
    Device nodes in DT can associate themselves with one or more
    regulators/supply by providing a list of phandles (to regulator nodes)
    and corresponding supply names.

    For Example:
    devicenode: node@0x0 {
    ...
    ...
    vmmc-supply = <&regulator1>;
    vpll-supply = <&regulator2>;
    };

    The driver would then do a regulator_get(dev, "vmmc"); to get
    regulator1 and do a regulator_get(dev, "vpll"); to get
    regulator2.

    of_get_regulator() extracts the regulator node for a given
    device, based on the supply name.

    Use it to 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.

    Also, since the regulator dt nodes can use the same binding to
    associate with a parent regulator/supply, allow the drivers to
    specify a supply_name, which can then be used to lookup dt
    to find the parent phandle.

    Signed-off-by: Rajendra Nayak <rnayak@ti.com>
    Acked-by: Grant Likely <grant.likely@secretlab.ca>
    ---
    drivers/regulator/core.c | 79 ++++++++++++++++++++++++++++++++------
    include/linux/regulator/driver.h | 2 +
    2 files changed, 69 insertions(+), 12 deletions(-)

    diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
    index 6edaaf0..36fc0b0 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>
    @@ -131,6 +133,33 @@ static struct regulator *get_device_regulator(struct device *dev)
    return NULL;
    }

    +/**
    + * of_get_regulator - get a regulator device node based on supply name
    + * @dev: Device pointer for the consumer (of regulator) device
    + * @supply: regulator supply name
    + *
    + * Extract the regulator device node corresponding to the supply name.
    + * retruns the device node corresponding to the regulator if found, else
    + * returns NULL.
    + */
    +static struct device_node *of_get_regulator(struct device *dev, const char *supply)
    +{
    + struct device_node *regnode = NULL;
    + char prop_name[32]; /* 32 is max size of property name */
    +
    + dev_dbg(dev, "Looking up %s-supply from device tree\n", supply);
    +
    + snprintf(prop_name, 32, "%s-supply", supply);
    + regnode = of_parse_phandle(dev->of_node, prop_name, 0);
    +
    + if (!regnode) {
    + dev_warn(dev, "%s property in node %s references invalid phandle",
    + prop_name, dev->of_node->full_name);
    + return NULL;
    + }
    + return regnode;
    +}
    +
    /* Platform voltage constraint check */
    static int regulator_check_voltage(struct regulator_dev *rdev,
    int *min_uV, int *max_uV)
    @@ -1147,6 +1176,30 @@ static int _regulator_get_enable_time(struct regulator_dev *rdev)
    return rdev->desc->ops->enable_time(rdev);
    }

    +static struct regulator_dev *regulator_dev_lookup(struct device *dev,
    + const char *supply)
    +{
    + struct regulator_dev *r;
    + struct device_node *node;
    +
    + /* first do a dt based lookup */
    + if (dev && dev->of_node) {
    + node = of_get_regulator(dev, supply);
    + if (node)
    + list_for_each_entry(r, &regulator_list, list)
    + if (r->dev.parent &&
    + node == r->dev.of_node)
    + return r;
    + }
    +
    + /* if not found, try doing it non-dt way */
    + list_for_each_entry(r, &regulator_list, list)
    + if (strcmp(rdev_get_name(r), supply) == 0)
    + return r;
    +
    + return NULL;
    +}
    +
    /* Internal regulator request function */
    static struct regulator *_regulator_get(struct device *dev, const char *id,
    int exclusive)
    @@ -1167,6 +1220,10 @@ static struct regulator *_regulator_get(struct device *dev, const char *id,

    mutex_lock(&regulator_list_mutex);

    + rdev = regulator_dev_lookup(dev, id);
    + if (rdev)
    + goto found;
    +
    list_for_each_entry(map, &regulator_map_list, list) {
    /* If the mapping has a device set up it must match */
    if (map->dev_name &&
    @@ -2579,6 +2636,7 @@ struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc,
    static atomic_t regulator_no = ATOMIC_INIT(0);
    struct regulator_dev *rdev;
    int ret, i;
    + const char *supply;

    if (regulator_desc == NULL)
    return ERR_PTR(-EINVAL);
    @@ -2654,21 +2712,18 @@ struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc,
    if (ret < 0)
    goto scrub;

    - if (init_data->supply_regulator) {
    + if (init_data->supply_regulator)
    + supply = init_data->supply_regulator;
    + else if (regulator_desc->supply_name)
    + supply = regulator_desc->supply_name;
    +
    + if (supply) {
    struct regulator_dev *r;
    - int found = 0;

    - list_for_each_entry(r, &regulator_list, list) {
    - if (strcmp(rdev_get_name(r),
    - init_data->supply_regulator) == 0) {
    - found = 1;
    - break;
    - }
    - }
    + r = regulator_dev_lookup(dev, supply);

    - if (!found) {
    - dev_err(dev, "Failed to find supply %s\n",
    - init_data->supply_regulator);
    + if (!r) {
    + dev_err(dev, "Failed to find supply %s\n", supply);
    ret = -ENODEV;
    goto scrub;
    }
    diff --git a/include/linux/regulator/driver.h b/include/linux/regulator/driver.h
    index 461eb90..87a121c 100644
    --- a/include/linux/regulator/driver.h
    +++ b/include/linux/regulator/driver.h
    @@ -153,6 +153,7 @@ enum regulator_type {
    * this type.
    *
    * @name: Identifying name for the regulator.
    + * @supply_name: Identifying the regulator supply
    * @id: Numerical identifier for the regulator.
    * @n_voltages: Number of selectors available for ops.list_voltage().
    * @ops: Regulator operations table.
    @@ -162,6 +163,7 @@ enum regulator_type {
    */
    struct regulator_desc {
    const char *name;
    + const char *supply_name;
    int id;
    unsigned n_voltages;
    struct regulator_ops *ops;
    --
    1.7.1


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