ram: k3-ddrss: Add support for number of controllers under MSMC

In K3 multi-DDR systems, the MSMC is responsible for the interleave
mechanism across all the DDR controllers. Add support for MSMC to obtain
the number of controllers it's responsible for using the DT.

Reviewed-by: Udit Kumar <[email protected]>
Signed-off-by: Neha Malcom Francis <[email protected]>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/ram/k3-ddrss/k3-ddrss.c b/drivers/ram/k3-ddrss/k3-ddrss.c
index 61d4f3d7aa4..075e664ff1a 100644
--- a/drivers/ram/k3-ddrss/k3-ddrss.c
+++ b/drivers/ram/k3-ddrss/k3-ddrss.c
@@ -134,6 +134,7 @@ struct k3_msmc {
 	enum ecc_enable enable;
 	enum emif_config config;
 	enum emif_active active;
+	u32 num_ddr_controllers;
 };
 
 struct k3_ddrss_desc {
@@ -1013,6 +1014,13 @@ static int k3_msmc_probe(struct udevice *dev)
 		return -EINVAL;
 	}
 
+	ret = device_get_child_count(dev);
+	if (ret <= 0) {
+		dev_err(dev, "no child ddr nodes present");
+		return -EINVAL;
+	}
+	msmc->num_ddr_controllers = ret;
+
 	return 0;
 }