> The device lm90 can be controlled by the vdd rail.
> Adding the power control support to power on/off the vdd rail.
> And make sure that power is enabled before accessing the device.
>
> Signed-off-by: Wei Ni <w...@nvidia.com>
> ---
> drivers/hwmon/lm90.c | 52
> ++++++++++++++++++++++++++++++++++++++++++++++++++
[...]
> + if (!data->lm90_reg) {
> + data->lm90_reg = regulator_get(&client->dev, "vdd");
> + if (IS_ERR_OR_NULL(data->lm90_reg)) {
> + if (PTR_ERR(data->lm90_reg) == -ENODEV)
> + dev_info(&client->dev,
> + "No regulator found for vdd. Assuming
> vdd is always powered.");
> + else
> + dev_warn(&client->dev,
> + "Error [%ld] in getting the regulator
> handle for vdd.\n",
> + PTR_ERR(data->lm90_reg));
> + data->lm90_reg = NULL;
> + mutex_unlock(&data->update_lock);
> + return -ENODEV;
> + }
> + }
> + if (is_enable) {
> + ret = regulator_enable(data->lm90_reg);
> + msleep(POWER_ON_DELAY);
Can this delay be handled directly from regulator?
[...]
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