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Date: Tue, 17 Oct 2017 11:06:16 +0200 From: Maxime Ripard <maxime.ripard@...e-electrons.com> To: Daniel Vetter <daniel.vetter@...el.com>, David Airlie <airlied@...ux.ie>, Chen-Yu Tsai <wens@...e.org>, Maxime Ripard <maxime.ripard@...e-electrons.com> Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, Mark Rutland <mark.rutland@....com>, Rob Herring <robh+dt@...nel.org>, linux-arm-kernel@...ts.infradead.org, linux-clk@...r.kernel.org, plaes@...es.org, icenowy@...c.io, Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>, Quentin Schulz <quentin.schulz@...e-electrons.com>, Mylene Josserand <mylene.josserand@...e-electrons.com> Subject: [PATCH 09/23] drm/panel: lvds: Add support for the power-supply property A significant number of panels need to power up a regulator in order to operate properly. Add support for the power-supply property to enable and disable such a regulator whenever needed. Signed-off-by: Maxime Ripard <maxime.ripard@...e-electrons.com> --- drivers/gpu/drm/panel/panel-lvds.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/drivers/gpu/drm/panel/panel-lvds.c b/drivers/gpu/drm/panel/panel-lvds.c index e2d57c01200b..57e38a9e7ab4 100644 --- a/drivers/gpu/drm/panel/panel-lvds.c +++ b/drivers/gpu/drm/panel/panel-lvds.c @@ -17,6 +17,7 @@ #include <linux/module.h> #include <linux/of_platform.h> #include <linux/platform_device.h> +#include <linux/regulator/consumer.h> #include <linux/slab.h> #include <drm/drmP.h> @@ -39,6 +40,7 @@ struct panel_lvds { bool data_mirror; struct backlight_device *backlight; + struct regulator *supply; struct gpio_desc *enable_gpio; struct gpio_desc *reset_gpio; @@ -69,6 +71,9 @@ static int panel_lvds_unprepare(struct drm_panel *panel) if (lvds->enable_gpio) gpiod_set_value_cansleep(lvds->enable_gpio, 0); + if (lvds->supply) + regulator_disable(lvds->supply); + return 0; } @@ -76,6 +81,17 @@ static int panel_lvds_prepare(struct drm_panel *panel) { struct panel_lvds *lvds = to_panel_lvds(panel); + if (lvds->supply) { + int err; + + err = regulator_enable(lvds->supply); + if (err < 0) { + dev_err(lvds->dev, "failed to enable supply: %d\n", + err); + return err; + } + } + if (lvds->enable_gpio) gpiod_set_value_cansleep(lvds->enable_gpio, 1); @@ -196,6 +212,13 @@ static int panel_lvds_probe(struct platform_device *pdev) if (ret < 0) return ret; + lvds->supply = devm_regulator_get_optional(lvds->dev, "power"); + if (IS_ERR(lvds->supply)) { + ret = PTR_ERR(lvds->supply); + dev_err(lvds->dev, "failed to request regulator: %d\n", ret); + return ret; + } + /* Get GPIOs and backlight controller. */ lvds->enable_gpio = devm_gpiod_get_optional(lvds->dev, "enable", GPIOD_OUT_LOW); -- git-series 0.9.1
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