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drm/bridge: dumb-vga-dac: Support a VDD regulator supply

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Some dumb VGA DACs are active components which require external power.
Add support for specifying a regulator as its power supply.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Archit Taneja <architt@codeaurora.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20161116154232.872-2-wens@csie.org
This commit is contained in:
Chen-Yu Tsai 2016-11-16 23:42:31 +08:00 committed by Archit Taneja
parent 5620f47dfa
commit af948a25ec
2 changed files with 35 additions and 0 deletions
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2
Documentation/devicetree/bindings/display/bridge/dumb-vga-dac.txt
View file

@ -16,6 +16,8 @@ graph bindings specified in Documentation/devicetree/bindings/graph.txt.
- Video port 0 for RGB input
- Video port 1 for VGA output
Optional properties:
- vdd-supply: Power supply for DAC
Example
-------

33
drivers/gpu/drm/bridge/dumb-vga-dac.c
View file

@ -12,6 +12,7 @@
#include <linux/module.h>
#include <linux/of_graph.h>
#include <linux/regulator/consumer.h>
#include <drm/drmP.h>
#include <drm/drm_atomic_helper.h>
@ -23,6 +24,7 @@ struct dumb_vga {
struct drm_connector connector;
struct i2c_adapter *ddc;
struct regulator *vdd;
};
static inline struct dumb_vga *
@ -124,8 +126,30 @@ static int dumb_vga_attach(struct drm_bridge *bridge)
return 0;
}
static void dumb_vga_enable(struct drm_bridge *bridge)
{
struct dumb_vga *vga = drm_bridge_to_dumb_vga(bridge);
int ret = 0;
if (vga->vdd)
ret = regulator_enable(vga->vdd);
if (ret)
DRM_ERROR("Failed to enable vdd regulator: %d\n", ret);
}
static void dumb_vga_disable(struct drm_bridge *bridge)
{
struct dumb_vga *vga = drm_bridge_to_dumb_vga(bridge);
if (vga->vdd)
regulator_disable(vga->vdd);
}
static const struct drm_bridge_funcs dumb_vga_bridge_funcs = {
.attach = dumb_vga_attach,
.enable = dumb_vga_enable,
.disable = dumb_vga_disable,
};
static struct i2c_adapter *dumb_vga_retrieve_ddc(struct device *dev)
@ -169,6 +193,15 @@ static int dumb_vga_probe(struct platform_device *pdev)
return -ENOMEM;
platform_set_drvdata(pdev, vga);
vga->vdd = devm_regulator_get_optional(&pdev->dev, "vdd");
if (IS_ERR(vga->vdd)) {
ret = PTR_ERR(vga->vdd);
if (ret == -EPROBE_DEFER)
return -EPROBE_DEFER;
vga->vdd = NULL;
dev_dbg(&pdev->dev, "No vdd regulator found: %d\n", ret);
}
vga->ddc = dumb_vga_retrieve_ddc(&pdev->dev);
if (IS_ERR(vga->ddc)) {
if (PTR_ERR(vga->ddc) == -ENODEV) {