[PATCH 1/3] drm/bridge: ti-sn65dsi83: Add vcc supply regulator support

[Alexander Stein]

VCC needs to be enabled before releasing the enable GPIO.

Signed-off-by: Alexander Stein <alexander.st...@ew.tq-group.com>
---
 drivers/gpu/drm/bridge/ti-sn65dsi83.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi83.c 
b/drivers/gpu/drm/bridge/ti-sn65dsi83.c
index a32f70bc68ea..5fab0fabcd15 100644
--- a/drivers/gpu/drm/bridge/ti-sn65dsi83.c
+++ b/drivers/gpu/drm/bridge/ti-sn65dsi83.c
@@ -33,6 +33,7 @@
 #include <linux/of_device.h>
 #include <linux/of_graph.h>
 #include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
 
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_bridge.h>
@@ -143,6 +144,7 @@ struct sn65dsi83 {
        struct mipi_dsi_device          *dsi;
        struct drm_bridge               *panel_bridge;
        struct gpio_desc                *enable_gpio;
+       struct regulator                *vcc;
        int                             dsi_lanes;
        bool                            lvds_dual_link;
        bool                            lvds_dual_link_even_odd_swap;
@@ -647,6 +649,12 @@ static int sn65dsi83_parse_dt(struct sn65dsi83 *ctx, enum 
sn65dsi83_model model)
 
        ctx->panel_bridge = panel_bridge;
 
+       ctx->vcc = devm_regulator_get(dev, "vcc");
+       if (IS_ERR(ctx->vcc))
+               return dev_err_probe(dev, PTR_ERR(ctx->vcc),
+                                    "Failed to get supply 'vcc': %pe\n",
+                                    ERR_PTR(ret));
+
        return 0;
 }
 
@@ -690,7 +698,11 @@ static int sn65dsi83_probe(struct i2c_client *client,
        ctx->bridge.of_node = dev->of_node;
        drm_bridge_add(&ctx->bridge);
 
-       return 0;
+       ret = regulator_enable(ctx->vcc);
+       if (ret)
+               dev_err(dev, "Failed to enable vcc\n");
+
+       return ret;
 }
 
 static int sn65dsi83_remove(struct i2c_client *client)
@@ -701,6 +713,7 @@ static int sn65dsi83_remove(struct i2c_client *client)
        mipi_dsi_device_unregister(ctx->dsi);
        drm_bridge_remove(&ctx->bridge);
        of_node_put(ctx->host_node);
+       regulator_disable(ctx->vcc);
 
        return 0;
 }
-- 
2.25.1