On Sat, Oct 29, 2016 at 07:06:10PM +0800, Chen-Yu Tsai wrote: > 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@xxxxxxxx> > --- > .../bindings/display/bridge/dumb-vga-dac.txt | 2 ++ For the binding, Acked-by: Rob Herring <robh@xxxxxxxxxx> One code comment below... > drivers/gpu/drm/bridge/dumb-vga-dac.c | 35 ++++++++++++++++++++++ > 2 files changed, 37 insertions(+) > > diff --git a/Documentation/devicetree/bindings/display/bridge/dumb-vga-dac.txt b/Documentation/devicetree/bindings/display/bridge/dumb-vga-dac.txt > index 003bc246a270..164cbb15f04c 100644 > --- a/Documentation/devicetree/bindings/display/bridge/dumb-vga-dac.txt > +++ b/Documentation/devicetree/bindings/display/bridge/dumb-vga-dac.txt > @@ -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 > ------- > diff --git a/drivers/gpu/drm/bridge/dumb-vga-dac.c b/drivers/gpu/drm/bridge/dumb-vga-dac.c > index afec232185a7..59781e031220 100644 > --- a/drivers/gpu/drm/bridge/dumb-vga-dac.c > +++ b/drivers/gpu/drm/bridge/dumb-vga-dac.c > @@ -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 +126,33 @@ 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; > + > + if (!IS_ERR(vga->vdd)) { if (IS_ERR()) return; ...will save some intentation. > + ret = regulator_enable(vga->vdd); > + > + if (ret) { > + DRM_ERROR("Failed to enable vdd regulator: %d\n", ret); > + return; > + } > + } > +} > + > +static void dumb_vga_disable(struct drm_bridge *bridge) > +{ > + struct dumb_vga *vga = drm_bridge_to_dumb_vga(bridge); > + > + if (!IS_ERR(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 +196,14 @@ 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; > + 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) { > -- > 2.9.3 > -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html