[PATCH 7/8] adc: rockchip-saradc: Use vdd-microvolts prop as fallback

[Jonas Karlman]

Change to use vdd-microvolts prop value as voltage reference when the
supply regulator is missing or when DM_REGULATOR=n is used.

Signed-off-by: Jonas Karlman <jonas at kwiboo.se>
---
 drivers/adc/rockchip-saradc.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/adc/rockchip-saradc.c b/drivers/adc/rockchip-saradc.c
index f6832ab30731..7cf9735f60d0 100644
--- a/drivers/adc/rockchip-saradc.c
+++ b/drivers/adc/rockchip-saradc.c
@@ -241,7 +241,7 @@ int rockchip_saradc_probe(struct udevice *dev)
 {
 	struct adc_uclass_plat *uc_pdata = dev_get_uclass_plat(dev);
 	struct rockchip_saradc_priv *priv = dev_get_priv(dev);
-	struct udevice *vref;
+	struct udevice *vref = NULL;
 	struct clk clk;
 	int vref_uv;
 	int ret;
@@ -259,7 +259,7 @@ int rockchip_saradc_probe(struct udevice *dev)
 	priv->active_channel = -1;
 
 	ret = device_get_supply_regulator(dev, "vref-supply", &vref);
-	if (ret) {
+	if (ret && uc_pdata->vdd_microvolts <= 0) {
 		printf("can't get vref-supply: %d\n", ret);
 		return ret;
 	}
@@ -267,7 +267,10 @@ int rockchip_saradc_probe(struct udevice *dev)
 	if (priv->reset)
 		rockchip_saradc_reset_controller(priv->reset);
 
-	vref_uv = regulator_get_value(vref);
+	if (vref)
+		vref_uv = regulator_get_value(vref);
+	else
+		vref_uv = uc_pdata->vdd_microvolts;
 	if (vref_uv < 0) {
 		printf("can't get vref-supply value: %d\n", vref_uv);
 		return vref_uv;
-- 
2.46.2