Re: [RFC PATCH v2 1/3] regulator: bindings: Add properties for coupled regulators
From: Maciej Purski
Date: Wed Oct 25 2017 - 03:31:56 EST
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.
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.
+- regulator-coupled-max-spread: Max spread between voltages of coupled regulators
+ in microvolts.
Deprecated properties:
- regulator-compatible: If a regulator chip contains multiple
--
2.7.4