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Subject[PATCH v3 16/25] drm/sun4i: sun6i_mipi_dsi: Add support for VCC-DSI voltage regulator
Date
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 <jagan@amarulasolutions.com>
Tested-by: Jagan Teki <jagan@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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