dt-bindings: mfd: bd9571mwv: Document DDR Backup Mode properties

Document the new optional properties related to DDR Backup Mode and
toggle/momentary power switches.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Rob Herring <robh@kernel.org>
Acked-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/Documentation/devicetree/bindings/mfd/bd9571mwv.txt b/Documentation/devicetree/bindings/mfd/bd9571mwv.txt
index 9ab216a851d5619becdf70da0b5a2c14f73026e2..25d1f697eb25c67d9a42dbd7a50dbb3d0af88aaf 100644 (file)
--- a/Documentation/devicetree/bindings/mfd/bd9571mwv.txt
+++ b/Documentation/devicetree/bindings/mfd/bd9571mwv.txt
@@ -25,6 +25,25 @@ Required properties:
                            Each child node is defined using the standard
                            binding for regulators.
 
+Optional properties:
+  - rohm,ddr-backup-power : Value to use for DDR-Backup Power (default 0).
+                           This is a bitmask that specifies which DDR power
+                           rails need to be kept powered when backup mode is
+                           entered, for system suspend:
+                             - bit 0: DDR0
+                             - bit 1: DDR1
+                             - bit 2: DDR0C
+                             - bit 3: DDR1C
+                           These bits match the KEEPON_DDR* bits in the
+                           documentation for the "BKUP Mode Cnt" register.
+  - rohm,rstbmode-level: The RSTB signal is configured for level mode, to
+                        accommodate a toggle power switch (the RSTBMODE pin is
+                        strapped low).
+  - rohm,rstbmode-pulse: The RSTB signal is configured for pulse mode, to
+                        accommodate a momentary power switch (the RSTBMODE pin
+                        is strapped high).
+                        The two properties above are mutually exclusive.
+
 Example:
 
        pmic: pmic@30 {
@@ -36,6 +55,8 @@ Example:
                #interrupt-cells = <2>;
                gpio-controller;
                #gpio-cells = <2>;
+               rohm,ddr-backup-power = <0xf>;
+               rohm,rstbmode-pulse;
 
                regulators {
                        dvfs: dvfs {