[PATCH 3/6] misc: k3_avs: Add k3_check_opp function

[Aniket Limaye]

From: Reid Tonking <reidt at ti.com>

Useful when trying to check if an opp efuse is burned in or not.

k3_avs driver checks opp_ids when probing and overwrites the voltage
values in vd_data for the respective board. This can be called to check
that data and returns 0 if valid.

Signed-off-by: Reid Tonking <reidt at ti.com>
Signed-off-by: Aniket Limaye <a-limaye at ti.com>
---
 drivers/misc/k3_avs.c | 25 +++++++++++++++++++++++++
 include/k3-avs.h      |  1 +
 2 files changed, 26 insertions(+)

diff --git a/drivers/misc/k3_avs.c b/drivers/misc/k3_avs.c
index 9d950d034a5..90cd9dfe7f9 100644
--- a/drivers/misc/k3_avs.c
+++ b/drivers/misc/k3_avs.c
@@ -192,6 +192,31 @@ static int match_opp(struct vd_data *vd, u32 freq)
 	return -EINVAL;
 }
 
+/**
+ * k3_check_opp: Check for presence of opp efuse
+ * @opp_id: opp id to check if voltage is present
+ *
+ * Checks to see if an opp has voltage. k3_avs probe will populate
+ * votlage data if efuse is present. Returns 0 if data is valid.
+ */
+int k3_check_opp(struct udevice *dev, int vdd_id, int opp_id)
+{
+	struct k3_avs_privdata *priv = dev_get_priv(dev);
+	struct vd_data *vd;
+	int volt;
+
+	vd = get_vd(priv, vdd_id);
+	if (!vd)
+		return -EINVAL;
+
+	volt = vd->opps[opp_id].volt;
+	if (volt)
+		return 0;
+
+	printf("No efuse found for opp_%d\n", opp_id);
+	return -EINVAL;
+}
+
 /**
  * k3_avs_notify_freq: Notify clock rate change towards AVS subsystem
  * @dev_id: Device ID for the clock to be changed
diff --git a/include/k3-avs.h b/include/k3-avs.h
index f6f1031c9cc..41a1da36356 100644
--- a/include/k3-avs.h
+++ b/include/k3-avs.h
@@ -27,5 +27,6 @@
 
 int k3_avs_set_opp(struct udevice *dev, int vdd_id, int opp_id);
 int k3_avs_notify_freq(int dev_id, int clk_id, u32 freq);
+int k3_check_opp(struct udevice *dev, int vdd_id, int opp_id);
 
 #endif
-- 
2.34.1