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authorMark Brown <broonie@opensource.wolfsonmicro.com>2012-04-19 13:19:07 +0100
committerMark Brown <broonie@opensource.wolfsonmicro.com>2012-04-20 10:12:38 +0100
commit6492bc1b1a9cb21d28cde3c70d090c7648c8b0ed (patch)
tree864ac01b80bbc6e57cbd86e0938b20112d68fe4a /Documentation
parent854ccbaee7e48734936690a3fd4817c57e98aaad (diff)
downloadlinux-6492bc1b1a9cb21d28cde3c70d090c7648c8b0ed.tar.gz
regulator: core: Optimise enable/disable path for always on regulators
If a regulator is always on for any reason then cache that when the consumer is created and use it to optimise away the need to take locks or recurse up the supply tree when consumers do enable or disable calls. The scheduling of asynchronous work for bulk enables is also skipped. We don't actually check if the device physically supports control on the basis that constraints allowing status changes on physically always on regulators are nonsensical anyway. This is a very common pattern in hardware - it's normal to have some power supplies that have either no software control or are critical to system function - so many systems should be able to benefit. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Acked-by: Liam Girdwood <lrg@ti.com>
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