[PATCH v3 6/9] ram: k3-ddrss: Add support for number of controllers under MSMC

[Neha Malcom Francis]

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 <u-kumar1 at ti.com>
Signed-off-by: Neha Malcom Francis <n-francis at ti.com>
---
Changes since v2:
- s/num_ddr/num_ddr_controllers

 drivers/ram/k3-ddrss/k3-ddrss.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/ram/k3-ddrss/k3-ddrss.c b/drivers/ram/k3-ddrss/k3-ddrss.c
index 5f48dda4468..856aa96e50f 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;
 }
 
-- 
2.34.1