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-rw-r--r--doc/device-tree-bindings/memory-controllers/st,stm32mp1-ddr.txt2
1 files changed, 2 insertions, 0 deletions
diff --git a/doc/device-tree-bindings/memory-controllers/st,stm32mp1-ddr.txt b/doc/device-tree-bindings/memory-controllers/st,stm32mp1-ddr.txt
index ee708ce92c7..ac6a7df4327 100644
--- a/doc/device-tree-bindings/memory-controllers/st,stm32mp1-ddr.txt
+++ b/doc/device-tree-bindings/memory-controllers/st,stm32mp1-ddr.txt
@@ -129,6 +129,8 @@ phyc attributes:
MR3
- st,phy-cal : phy cal depending of calibration or tuning of DDR
+ This parameter is optional; when it is absent the built-in PHY
+ calibration is done.
for STM32MP15x: 12 values are requested in this order
DX0DLLCR
DX0DQTR