[PATCH 2/4] drm/tiny: Read separate I/O regulator from DT

["Otto Pflüger" <affenull2345@gmail.com>]

Some platforms have a separate vddi supply for the panel I/O interface
(as defined by the MIPI DBI specification), so one power-supply is not
enough. Introduce a new "io-supply" property to set the vddi regulator.

After getting the regulator specified the device tree, use the new
io_regulator property of the DBI device so that the drm_mipi_dbi driver
can enable it.

Signed-off-by: Otto Pflüger <affenull2345@gmail.com>
---
  drivers/gpu/drm/tiny/panel-mipi-dbi.c | 5 +++++
  1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/tiny/panel-mipi-dbi.c 
b/drivers/gpu/drm/tiny/panel-mipi-dbi.c
index 03a7d569cd56..b09d2a47a409 100644
--- a/drivers/gpu/drm/tiny/panel-mipi-dbi.c
+++ b/drivers/gpu/drm/tiny/panel-mipi-dbi.c
@@ -297,6 +297,11 @@ static int panel_mipi_dbi_spi_probe(struct 
spi_device *spi)
  		return dev_err_probe(dev, PTR_ERR(dbidev->regulator),
  				     "Failed to get regulator 'power'\n");

+	dbidev->io_regulator = devm_regulator_get(dev, "io");
+	if (IS_ERR(dbidev->io_regulator))
+		return dev_err_probe(dev, PTR_ERR(dbidev->io_regulator),
+				     "Failed to get regulator 'io'\n");
+
  	dbidev->backlight = devm_of_find_backlight(dev);
  	if (IS_ERR(dbidev->backlight))
  		return dev_err_probe(dev, PTR_ERR(dbidev->backlight), "Failed to get 
backlight\n");
-- 
2.30.2