ram: stm32mp1: the property st, phy-cal becomes optional

This parameter "st,phy-cal" becomes optional and when it is
absent the built-in PHY calibration is done.

It is the case in the helper dtsi file "stm32mp15-ddr.dtsi"
except if DDR_PHY_CAL_SKIP is defined.

This patch also impact the ddr interactive mode
- the registers of the param 'phy.cal' are initialized to 0 when
  "st,phy-cal" is not present in device tree (default behavior when
  DDR_PHY_CAL_SKIP is not activated)
- the info 'cal' field can be use to change the calibration behavior
  - cal=1 => use param phy.cal to initialize the PHY, built-in training
             is skipped
  - cal=0 => param phy.cal is absent, built-in training is used (default)

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Acked-by: Patrice Chotard <patrice.chotard@st.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/arch/arm/dts/stm32mp15-ddr.dtsi b/arch/arm/dts/stm32mp15-ddr.dtsi
index 38f29bb789..8b20b5e173 100644
--- a/arch/arm/dts/stm32mp15-ddr.dtsi
+++ b/arch/arm/dts/stm32mp15-ddr.dtsi
@@ -133,6 +133,7 @@
 				DDR_MR3
 			>;
 
+#ifdef DDR_PHY_CAL_SKIP
 			st,phy-cal = <
 				DDR_DX0DLLCR
 				DDR_DX0DQTR
@@ -148,6 +149,8 @@
 				DDR_DX3DQSTR
 			>;
 
+#endif
+
 			status = "okay";
 		};
 	};