On Wed, Oct 25, 2017 at 2:31 AM, Maciej Purski <m.purski@xxxxxxxxxxx> wrote: > > > On 10/24/2017 08:58 PM, Rob Herring wrote: >> >> On Wed, Oct 18, 2017 at 02:47:00PM +0200, Maciej Purski wrote: >>> >>> Some regulators require keeping their voltage spread below defined >>> max_spread. >>> >>> Add properties to provide information on regulators' coupling. >>> >>> Signed-off-by: Maciej Purski <m.purski@xxxxxxxxxxx> >>> --- >>> Documentation/devicetree/bindings/regulator/regulator.txt | 4 ++++ >>> 1 file changed, 4 insertions(+) >>> >>> diff --git a/Documentation/devicetree/bindings/regulator/regulator.txt >>> b/Documentation/devicetree/bindings/regulator/regulator.txt >>> index 378f6dc..6769565 100644 >>> --- a/Documentation/devicetree/bindings/regulator/regulator.txt >>> +++ b/Documentation/devicetree/bindings/regulator/regulator.txt >>> @@ -60,6 +60,10 @@ Optional properties: >>> 0: Disable active discharge. >>> 1: Enable active discharge. >>> Absence of this property will leave configuration to default. >>> +- regulator-coupled-with: Phandle to regulators with which the regulator >>> + should be coupled. Allow up to 9 phandles. >> >> >> 9? Sounds like a driver detail and pretty arbitrary. >> > It's just a constant number that I defined as MAX_COUPLED, because in fact > there isn't any use-case yet for even more than two regulators so > MAX_COUPLED equal to 9 is a really high number. If you find it cleaner, I > can make this value variable. Just drop the statement. The OS simply needs to support however many there are for the h/w it supports. > >> Is this linkage 2-way meaning 2 coupled regulators both have links to >> the other one? If so, then what happens when you have a high number? If >> not, how does one decide which regulator has this property? > > > Yes, it is 2-way. When you have a high number, then each regulator should > have phandles to every other. So, if you have 3 regulators coupled, then > each one should have 2 phandles. Please add this to the description. That doesn't really seem ideal if you have a lot, but I somewhat doubt we'll see more than 2-3. Rob -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
