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

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Date:   Fri, 25 Nov 2022 18:44:18 +0100
From:   Otto Pflüger <affenull2345@...il.com>
To:     Noralf Trønnes <noralf@...nnes.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Sam Ravnborg <sam@...nborg.org>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 2/4] drm/tiny: Read separate I/O regulator from DT

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@...il.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