[PATCH] drm/imx: imx-tve: Make the 'dac' regulator optional

[Fabio Estevam]

From: Fabio Estevam <fabio.estevam at nxp.com>

Commit deb65870b5d9d ("drm/imx: imx-tve: check the value returned by
regulator_set_voltage()") exposes the following probe issue:

63ff0000.tve supply dac not found, using dummy regulator
imx-drm display-subsystem: failed to bind 63ff0000.tve (ops imx_tve_ops): -22

When the 'dac' regulator is not passed in the device tree,
devm_regulator_get() will return NULL and when regulator_set_voltage()
is called it returns an error.

Fix the issue by making the 'dac' regulator optional.

Fixes: deb65870b5d9d ("drm/imx: imx-tve: check the value returned by regulator_set_voltage()")
Cc: <stable at vger.kernel.org> # 4.8+
Signed-off-by: Fabio Estevam <fabio.estevam at nxp.com>
---
 drivers/gpu/drm/imx/imx-tve.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/imx/imx-tve.c b/drivers/gpu/drm/imx/imx-tve.c
index 3b602ee..cec0e12 100644
--- a/drivers/gpu/drm/imx/imx-tve.c
+++ b/drivers/gpu/drm/imx/imx-tve.c
@@ -619,7 +619,7 @@ static int imx_tve_bind(struct device *dev, struct device *master, void *data)
 		return ret;
 	}
 
-	tve->dac_reg = devm_regulator_get(dev, "dac");
+	tve->dac_reg = devm_regulator_get_optional(dev, "dac");
 	if (!IS_ERR(tve->dac_reg)) {
 		ret = regulator_set_voltage(tve->dac_reg, 2750000, 2750000);
 		if (ret)
-- 
2.7.4