[PATCH v4 2/3] drm/rockchip: implement dw_hdmi supplies for the Rockchip implementation

[heiko@sntech.de (Heiko Stübner)]

The Rockchip implementation of the IP exposes the supplies outside and
expects them to be supplied by a pmic. So implement regulator handling
for them.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Acked-by: Philipp Zabel <p.zabel@pengutronix.de>
---
changes since v3:
- split generic dt-bindings and rockchip implementation
- add Ack from Philipp Zabel
changes since v2:
- rename supplies to the names found in the hdmi IP databook
changes since v1:
- follow suggestion from Russell King to keep regulator handling local
  to the rockchip implementation for the time being and only generalize
  when a real second implementation needs regulator handling

 drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c | 32 ++++++++++++++++++++++++++++-
 1 file changed, 31 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c b/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
index 80d6fc8..9c003fa 100644
--- a/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
+++ b/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
@@ -11,6 +11,7 @@
 #include <linux/platform_device.h>
 #include <linux/mfd/syscon.h>
 #include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
 #include <drm/drm_of.h>
 #include <drm/drmP.h>
 #include <drm/drm_crtc_helper.h>
@@ -28,6 +29,9 @@ struct rockchip_hdmi {
 	struct device *dev;
 	struct regmap *regmap;
 	struct drm_encoder encoder;
+	struct regulator_bulk_data supplies[2];
+	int nsupplies;
+	bool supplies_enabled;
 };
 
 #define to_rockchip_hdmi(x)	container_of(x, struct rockchip_hdmi, x)
@@ -179,6 +183,12 @@ static struct drm_encoder_funcs dw_hdmi_rockchip_encoder_funcs = {
 
 static void dw_hdmi_rockchip_encoder_disable(struct drm_encoder *encoder)
 {
+	struct rockchip_hdmi *hdmi = to_rockchip_hdmi(encoder);
+
+	if (hdmi->nsupplies > 0 && hdmi->supplies_enabled) {
+		regulator_bulk_disable(hdmi->nsupplies, hdmi->supplies);
+		hdmi->supplies_enabled = false;
+	}
 }
 
 static bool
@@ -199,7 +209,16 @@ static void dw_hdmi_rockchip_encoder_commit(struct drm_encoder *encoder)
 {
 	struct rockchip_hdmi *hdmi = to_rockchip_hdmi(encoder);
 	u32 val;
-	int mux;
+	int mux, ret;
+
+	if (hdmi->nsupplies > 0 && !hdmi->supplies_enabled) {
+		ret = regulator_bulk_enable(hdmi->nsupplies, hdmi->supplies);
+		if (ret) {
+			dev_err(hdmi->dev, "could not enable hdmi analog supplies\n");
+			return;
+		}
+		hdmi->supplies_enabled = true;
+	}
 
 	mux = rockchip_drm_encoder_get_mux_id(hdmi->dev->of_node, encoder);
 	if (mux)
@@ -275,6 +294,17 @@ static int dw_hdmi_rockchip_bind(struct device *dev, struct device *master,
 	if (!iores)
 		return -ENXIO;
 
+	hdmi->supplies[0].supply = "vp";
+	hdmi->supplies[1].supply = "vph";
+	hdmi->nsupplies = 2;
+
+	ret = devm_regulator_bulk_get(hdmi->dev,
+				      hdmi->nsupplies, hdmi->supplies);
+	if (ret == -EPROBE_DEFER)
+		return ret;
+	if (ret)
+		hdmi->nsupplies = 0;
+
 	platform_set_drvdata(pdev, hdmi);
 
 	encoder->possible_crtcs = drm_of_find_possible_crtcs(drm, dev->of_node);
-- 
2.1.4