Especially, make clear what the return value means.
Signed-off-by: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
---
drivers/mmc/core/core.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index c287d297710aa4..7859bb617a2f60 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -1595,6 +1595,16 @@ EXPORT_SYMBOL_GPL(mmc_regulator_set_vqmmc);
#endif /* CONFIG_REGULATOR */
+/**
+ * mmc_regulator_get_supply - try to get VMMC and VQMMC regulators for a host
+ * @mmc: the host to regulate
+ *
+ * Returns 0 or errno. errno should be handled, it is either a critical error
+ * or -EPROBE_DEFER. 0 means no critical error but it does not mean all
+ * regulators have been found because they all are optional. If you require
+ * certain regulators, you need to check separately in your driver if they got
+ * populated after calling this function.
+ */
int mmc_regulator_get_supply(struct mmc_host *mmc)
{
struct device *dev = mmc_dev(mmc);
--
2.11.0
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