[PATCH v3 16/25] drm/sun4i: sun6i_mipi_dsi: Add support for VCC-DSI voltage regulator

[Jagan Teki]

Some boards have VCC-DSI pin connected to voltage regulator which may
not be turned on by default.

Add support for such boards by adding voltage regulator handling code to
MIPI DSI driver.

Signed-off-by: Jagan Teki <ja...@amarulasolutions.com>
Tested-by: Jagan Teki <ja...@amarulasolutions.com>
---
Changes for v3:
- new patch
Changes for v2:
- none

 drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 14 ++++++++++++++
 drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h |  3 +++
 2 files changed, 17 insertions(+)

diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c 
b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
index 42bd7506abaf..bc57343592e0 100644
--- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
+++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
@@ -949,6 +949,12 @@ static int sun6i_dsi_bind(struct device *dev, struct 
device *master,
 
        dsi->drv = drv;
 
+       ret = regulator_enable(dsi->regulator);
+       if (ret) {
+               dev_err(dev, "Failed to enable regulator\n");
+               return ret;
+       }
+
        drm_encoder_helper_add(&dsi->encoder,
                               &sun6i_dsi_enc_helper_funcs);
        ret = drm_encoder_init(drm,
@@ -980,6 +986,7 @@ static int sun6i_dsi_bind(struct device *dev, struct device 
*master,
 
 err_cleanup_connector:
        drm_encoder_cleanup(&dsi->encoder);
+       regulator_disable(dsi->regulator);
        return ret;
 }
 
@@ -989,6 +996,7 @@ static void sun6i_dsi_unbind(struct device *dev, struct 
device *master,
        struct sun6i_dsi *dsi = dev_get_drvdata(dev);
 
        drm_panel_detach(dsi->panel);
+       regulator_disable(dsi->regulator);
 }
 
 static const struct component_ops sun6i_dsi_ops = {
@@ -1022,6 +1030,12 @@ static int sun6i_dsi_probe(struct platform_device *pdev)
                return PTR_ERR(base);
        }
 
+       dsi->regulator = devm_regulator_get(dev, "vcc-dsi");
+       if (IS_ERR(dsi->regulator)) {
+               dev_err(dev, "Couldn't get regulator\n");
+               return PTR_ERR(dsi->regulator);
+       }
+
        dsi->regs = devm_regmap_init_mmio_clk(dev, "bus", base,
                                              &sun6i_dsi_regmap_config);
        if (IS_ERR(dsi->regs)) {
diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h 
b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h
index 597b62227019..0df60f84bab3 100644
--- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h
+++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h
@@ -13,6 +13,8 @@
 #include <drm/drm_encoder.h>
 #include <drm/drm_mipi_dsi.h>
 
+#include <linux/regulator/consumer.h>
+
 struct sun6i_dphy {
        struct clk              *bus_clk;
        struct clk              *mod_clk;
@@ -32,6 +34,7 @@ struct sun6i_dsi {
        struct clk              *bus_clk;
        struct clk              *mod_clk;
        struct regmap           *regs;
+       struct regulator        *regulator;
        struct reset_control    *reset;
        struct sun6i_dphy       *dphy;
 
-- 
2.18.0.321.gffc6fa0e3

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