dt-bindings: memory: tegra20-emc: Document opp-supported-hw property

Document opp-supported-hw property, which is not strictly necessary to
have on Tegra20, but it's very convenient to have because all other SoC
core devices will use hardware versioning, and thus, it's good to maintain
the consistency.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/20201203192439.16177-2-digetx@gmail.com
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>

diff --git a/Documentation/devicetree/bindings/memory-controllers/nvidia,tegra20-emc.txt b/Documentation/devicetree/bindings/memory-controllers/nvidia,tegra20-emc.txt
index 67ac8d1297da6fb8ddebccac6ae8a5364582fc6d..cc443fcf4bec86c2495389703733e9882547b9b9 100644 (file)
--- a/Documentation/devicetree/bindings/memory-controllers/nvidia,tegra20-emc.txt
+++ b/Documentation/devicetree/bindings/memory-controllers/nvidia,tegra20-emc.txt
@@ -16,6 +16,12 @@ Properties:
 - #interconnect-cells : Should be 0.
 - operating-points-v2: See ../bindings/opp/opp.txt for details.
 
+For each opp entry in 'operating-points-v2' table:
+- opp-supported-hw: One bitfield indicating SoC process ID mask
+
+       A bitwise AND is performed against this value and if any bit
+       matches, the OPP gets enabled.
+
 Optional properties:
 - core-supply: Phandle of voltage regulator of the SoC "core" power domain.