[PATCH v11 5/7] drm/sun4i: sun6i_mipi_dsi: Add VCC-DSI regulator support

[Jagan Teki]

Allwinner MIPI DSI controllers are supplied with SoC
DSI power rails via VCC-DSI pin.

Add support for this supply pin by adding voltage
regulator handling code to MIPI DSI driver.

Tested-by: Merlijn Wajer <merl...@wizzup.org>
Signed-off-by: Jagan Teki <ja...@amarulasolutions.com>
---
 drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 14 ++++++++++++++
 drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h |  2 ++
 2 files changed, 16 insertions(+)

diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c 
b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
index 446dc56cc44b..fe9a3667f3a1 100644
--- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
+++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
@@ -1110,6 +1110,12 @@ 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 VCC-DSI supply\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)) {
@@ -1183,6 +1189,13 @@ static int sun6i_dsi_remove(struct platform_device *pdev)
 static int __maybe_unused sun6i_dsi_runtime_resume(struct device *dev)
 {
        struct sun6i_dsi *dsi = dev_get_drvdata(dev);
+       int err;
+
+       err = regulator_enable(dsi->regulator);
+       if (err) {
+               dev_err(dsi->dev, "failed to enable VCC-DSI supply: %d\n", err);
+               return err;
+       }
 
        reset_control_deassert(dsi->reset);
        clk_prepare_enable(dsi->mod_clk);
@@ -1215,6 +1228,7 @@ static int __maybe_unused 
sun6i_dsi_runtime_suspend(struct device *dev)
 
        clk_disable_unprepare(dsi->mod_clk);
        reset_control_assert(dsi->reset);
+       regulator_disable(dsi->regulator);
 
        return 0;
 }
diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h 
b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h
index 5c3ad5be0690..a01d44e9e461 100644
--- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h
+++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h
@@ -12,6 +12,7 @@
 #include <drm/drm_connector.h>
 #include <drm/drm_encoder.h>
 #include <drm/drm_mipi_dsi.h>
+#include <linux/regulator/consumer.h>
 
 #define SUN6I_DSI_TCON_DIV     4
 
@@ -23,6 +24,7 @@ struct sun6i_dsi {
        struct clk              *bus_clk;
        struct clk              *mod_clk;
        struct regmap           *regs;
+       struct regulator        *regulator;
        struct reset_control    *reset;
        struct phy              *dphy;
 
-- 
2.18.0.321.gffc6fa0e3

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