From 26988efe11b1dc44853035122927ced25578f302 Mon Sep 17 00:00:00 2001 From: Javier Martinez Canillas Date: Tue, 29 Jul 2014 18:28:56 +0200 Subject: [PATCH] regulator: core: Allow to get voltage count and list from parent Load switches are modeled as regulators but they just provide the voltage of their parent input supply. So, the drivers for these switches usually neither provide a .list_voltage handler not set a .n_voltages count. But there is code in the kernel that assumes that all regulators should be able to provide this information (e.g: cpufreq and mmc subsystems). If the voltage count and list are not available for a regulator and it has a parent input supply, then use the parent values. Signed-off-by: Javier Martinez Canillas Signed-off-by: Mark Brown --- drivers/regulator/core.c | 23 +++++++++++++++++------ 1 file changed, 17 insertions(+), 6 deletions(-) diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c index 57fe446fabce..5299456d07ee 100644 --- a/drivers/regulator/core.c +++ b/drivers/regulator/core.c @@ -2182,7 +2182,13 @@ int regulator_count_voltages(struct regulator *regulator) { struct regulator_dev *rdev = regulator->rdev; - return rdev->desc->n_voltages ? : -EINVAL; + if (rdev->desc->n_voltages) + return rdev->desc->n_voltages; + + if (!rdev->supply) + return -EINVAL; + + return regulator_count_voltages(rdev->supply); } EXPORT_SYMBOL_GPL(regulator_count_voltages); @@ -2205,12 +2211,17 @@ int regulator_list_voltage(struct regulator *regulator, unsigned selector) if (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1 && !selector) return rdev->desc->fixed_uV; - if (!ops->list_voltage || selector >= rdev->desc->n_voltages) + if (ops->list_voltage) { + if (selector >= rdev->desc->n_voltages) + return -EINVAL; + mutex_lock(&rdev->mutex); + ret = ops->list_voltage(rdev, selector); + mutex_unlock(&rdev->mutex); + } else if (rdev->supply) { + ret = regulator_list_voltage(rdev->supply, selector); + } else { return -EINVAL; - - mutex_lock(&rdev->mutex); - ret = ops->list_voltage(rdev, selector); - mutex_unlock(&rdev->mutex); + } if (ret > 0) { if (ret < rdev->constraints->min_uV)