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drm/panel: otm8009a: Add support for the optional power-supply 

Add support for the optional power-supply.

Note: A "dummy regulator" is returned by devm_regulator_get()
if the optional regulator is not present in the device tree,
simplifying the source code when enabling/disabling the regulator.

Signed-off-by: Philippe Cornu <philippe.cornu@st.com>
Reviewed-by: Yannick Fertré <yannick.fertre@st.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180205094532.23547-3-philippe.cornu@st.com
This commit is contained in:
Philippe CORNU 2018-02-05 10:45:32 +01:00 committed by Thierry Reding
parent 683ad26121
commit ded8d7fe8d
1 changed files with 17 additions and 0 deletions
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17
drivers/gpu/drm/panel/panel-orisetech-otm8009a.c
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@ -11,6 +11,7 @@
#include <drm/drm_panel.h>
#include <linux/backlight.h>
#include <linux/gpio/consumer.h>
#include <linux/regulator/consumer.h>
#include <video/mipi_display.h>
#define DRV_NAME "orisetech_otm8009a"
@ -62,6 +63,7 @@ struct otm8009a {
struct drm_panel panel;
struct backlight_device *bl_dev;
struct gpio_desc *reset_gpio;
struct regulator *supply;
bool prepared;
bool enabled;
};
@ -279,6 +281,8 @@ static int otm8009a_unprepare(struct drm_panel *panel)
msleep(20);
}
regulator_disable(ctx->supply);
ctx->prepared = false;
return 0;
@ -292,6 +296,12 @@ static int otm8009a_prepare(struct drm_panel *panel)
if (ctx->prepared)
return 0;
ret = regulator_enable(ctx->supply);
if (ret < 0) {
DRM_ERROR("failed to enable supply: %d\n", ret);
return ret;
}
if (ctx->reset_gpio) {
gpiod_set_value_cansleep(ctx->reset_gpio, 0);
gpiod_set_value_cansleep(ctx->reset_gpio, 1);
@ -414,6 +424,13 @@ static int otm8009a_probe(struct mipi_dsi_device *dsi)
return PTR_ERR(ctx->reset_gpio);
}
ctx->supply = devm_regulator_get(dev, "power");
if (IS_ERR(ctx->supply)) {
ret = PTR_ERR(ctx->supply);
dev_err(dev, "failed to request regulator: %d\n", ret);
return ret;
}
mipi_dsi_set_drvdata(dsi, ctx);
ctx->dev = dev;