ram: k3-ddrss: Enable vtt regulator if present
Attempt to get and enable a vtt regulator if one is provided from the
dts. If we do not find one, continue as not all platforms have this.
Signed-off-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
Signed-off-by: Dave Gerlach <d-gerlach@ti.com>
diff --git a/drivers/ram/k3-ddrss/k3-ddrss.c b/drivers/ram/k3-ddrss/k3-ddrss.c
index 8d9e7d2..cb8edcb 100644
--- a/drivers/ram/k3-ddrss/k3-ddrss.c
+++ b/drivers/ram/k3-ddrss/k3-ddrss.c
@@ -15,6 +15,7 @@
#include <asm/io.h>
#include <power-domain.h>
#include <wait_bit.h>
+#include <power/regulator.h>
#include "lpddr4_obj_if.h"
#include "lpddr4_if.h"
@@ -40,6 +41,7 @@
u32 ddr_freq1;
u32 ddr_freq2;
u32 ddr_fhs_cnt;
+ struct udevice *vtt_supply;
};
static lpddr4_obj *driverdt;
@@ -215,6 +217,18 @@
return ret;
}
+ ret = device_get_supply_regulator(ddrss->dev, "vtt-supply",
+ &ddrss->vtt_supply);
+ if (ret) {
+ dev_dbg(ddrss->dev, "vtt-supply not found.\n");
+ } else {
+ ret = regulator_set_value(ddrss->vtt_supply, 3300000);
+ if (ret)
+ return ret;
+ dev_dbg(ddrss->dev, "VTT regulator enabled, volt = %d\n",
+ regulator_get_value(ddrss->vtt_supply));
+ }
+
return 0;
}