[linux-sunxi] [PATCH v2 08/13] drm: sun4i: Add support for enabling DDC I2C bus to dw_hdmi glue

[megous via linux-sunxi]

From: Ondrej Jirman <meg...@megous.com>

Orange Pi 3 board requires enabling DDC I2C bus via some GPIO connected
transistors, before it can be used. Model this as a power supply for DDC
(via regulator framework).

Signed-off-by: Ondrej Jirman <meg...@megous.com>
---
 drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c | 17 ++++++++++++++++-
 drivers/gpu/drm/sun4i/sun8i_dw_hdmi.h |  1 +
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c 
b/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c
index dc47720c99ba..a1518525fa2f 100644
--- a/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c
+++ b/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c
@@ -146,16 +146,28 @@ static int sun8i_dw_hdmi_bind(struct device *dev, struct 
device *master,
                return PTR_ERR(hdmi->regulator);
        }
 
+       hdmi->ddc_regulator = devm_regulator_get(dev, "ddc");
+       if (IS_ERR(hdmi->ddc_regulator)) {
+               dev_err(dev, "Couldn't get ddc regulator\n");
+               return PTR_ERR(hdmi->ddc_regulator);
+       }
+
        ret = regulator_enable(hdmi->regulator);
        if (ret) {
                dev_err(dev, "Failed to enable regulator\n");
                return ret;
        }
 
+       ret = regulator_enable(hdmi->ddc_regulator);
+       if (ret) {
+               dev_err(dev, "Failed to enable ddc regulator\n");
+               goto err_disable_regulator;
+       }
+
        ret = reset_control_deassert(hdmi->rst_ctrl);
        if (ret) {
                dev_err(dev, "Could not deassert ctrl reset control\n");
-               goto err_disable_regulator;
+               goto err_disable_ddc_regulator;
        }
 
        ret = clk_prepare_enable(hdmi->clk_tmds);
@@ -208,6 +220,8 @@ static int sun8i_dw_hdmi_bind(struct device *dev, struct 
device *master,
        clk_disable_unprepare(hdmi->clk_tmds);
 err_assert_ctrl_reset:
        reset_control_assert(hdmi->rst_ctrl);
+err_disable_ddc_regulator:
+       regulator_disable(hdmi->ddc_regulator);
 err_disable_regulator:
        regulator_disable(hdmi->regulator);
 
@@ -223,6 +237,7 @@ static void sun8i_dw_hdmi_unbind(struct device *dev, struct 
device *master,
        sun8i_hdmi_phy_remove(hdmi);
        clk_disable_unprepare(hdmi->clk_tmds);
        reset_control_assert(hdmi->rst_ctrl);
+       regulator_disable(hdmi->ddc_regulator);
        regulator_disable(hdmi->regulator);
 }
 
diff --git a/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.h 
b/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.h
index 720c5aa8adc1..6e93d55560b6 100644
--- a/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.h
+++ b/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.h
@@ -188,6 +188,7 @@ struct sun8i_dw_hdmi {
        struct sun8i_hdmi_phy           *phy;
        struct dw_hdmi_plat_data        plat_data;
        struct regulator                *regulator;
+       struct regulator                *ddc_regulator;
        const struct sun8i_dw_hdmi_quirks *quirks;
        struct reset_control            *rst_ctrl;
 };
-- 
2.21.0

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