linux-kernel - [PATCH 3/4] dt-bindings: regulator: bd71847: add property for omitting ON/OFF control

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Message-ID: <51022c60412297ad9b22501452d60ba2dce38d2e.1599029334.git.matti.vaittinen@fi.rohmeurope.com>
Date:   Thu, 3 Sep 2020 21:38:48 +0300
From:   Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
To:     mazziesaccount@...il.com
Cc:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Matti Vaittinen <matti.vaittinen@...rohmeurope.com>,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-power@...rohmeurope.com
Subject: [PATCH 3/4] dt-bindings: regulator: bd71847: add property for
 omitting ON/OFF control

The BD718(37/47/50) regulator enable states can be controlled either by SW
or by PMIC internal state machine.

On some systems mixture of SW and HW state machine controlled regulators is
needed.

Specifically, some SoCs signal SUSPEND state change to PMIC via
STBY_REQ line. Now there are setups that expect certain regulators then to
be disabled (by PMIC state machine) while other regulators should stay
enabled (regardless of HW state => SW control required).

Add a new device-tree property "rohm,no-regulator-enable-control" which can
be used to leave regulator(s) under HW state machine control.

Signed-off-by: Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
---
 .../bindings/regulator/rohm,bd71847-regulator.yaml    | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/Documentation/devicetree/bindings/regulator/rohm,bd71847-regulator.yaml b/Documentation/devicetree/bindings/regulator/rohm,bd71847-regulator.yaml
index 07256a4b50b9..eeac32cd15d6 100644
--- a/Documentation/devicetree/bindings/regulator/rohm,bd71847-regulator.yaml
+++ b/Documentation/devicetree/bindings/regulator/rohm,bd71847-regulator.yaml
@@ -88,6 +88,17 @@ patternProperties:
         # ----------------------------------------------------------------
         # rest | not supported   | not supported    | not supported
 
+      # BD718(47/50) power outputs can either be controlled by the PMIC internal
+      # hardware state machine or by software. If you need regulators to be
+      # turned ON/OFF for example based on PMIC_STBY_REQ line (which toggles
+      # PMIC HW state machine) - then you should set this property.
+      # Tradeoff is that then SW can't control the ON/OFF state for this
+      # regulator (other than invoking a PMIC state change).
+      rohm,no-regulator-enable-control:
+        description: |
+          Enable/Disable control of this regulator must be left to the
+          PMIC hardware state machine.
+        type: boolean
     required:
       - regulator-name
 
-- 
2.21.0


-- 
Matti Vaittinen, Linux device drivers
ROHM Semiconductors, Finland SWDC
Kiviharjunlenkki 1E
90220 OULU
FINLAND

~~~ "I don't think so," said Rene Descartes. Just then he vanished ~~~
Simon says - in Latin please.
~~~ "non cogito me" dixit Rene Descarte, deinde evanescavit ~~~
Thanks to Simon Glass for the translation =]