This patch series adds a variant of regulator_get() which allows regulator consumers to tell the core that the supply they are requesting may genuinely be absent in the system. The goal is to help address some of the problems with handling errors in regulator_get() in drivers that are newly converted to the regulator API by allowing the core to provide stub regulators for supplies that aren't hooked up without disrupting the operation of drivers like MMC drivers which may genuinely not have some of their supplies hooked up.
Currently the code simply introduces a new API call with exactly the same implementation as regulator_get() so there should be zero impact from the series other than a slightly larger kernel.
Right now all the MMC users are converted over as-is, though it does look like drivers such as sdhci really ought to be insisting on having a regulator for VMMC in the same way that the MMC core helper does (and indeed in that case it looks like it ought to be converted over to the core code).
If this series is OK I'd like to merge it via the regulator tree so that the functionality to make use of the optional regulators can be built out on top of it.
Mark Brown (5): regulator: core: Provide hints to the core about optional supplies mmc: core: Indicate that vmmcq may be absent mmc: sdhci: Indicate that regulators may be absent mmc: dw_mmc: Indicate that regulators may be absent mmc: pxamci: Indicate that regulators may be absent
drivers/mmc/core/core.c | 2 +- drivers/mmc/host/dw_mmc.c | 2 +- drivers/mmc/host/pxamci.c | 2 +- drivers/mmc/host/sdhci.c | 4 +-- drivers/regulator/core.c | 59 ++++++++++++++++++++++++++++++++++++++ include/linux/regulator/consumer.h | 18 +++++++++++- 6 files changed, 81 insertions(+), 6 deletions(-)