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drm/tilcdc: panel: Fix backlight devicetree support

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The current backlight support is broken; the driver expects a backlight-class
in the panel devicetree node. Fix this by implementing it properly, getting
an optional backlight from a phandle.

This shouldn't cause any backward-compatibility DT issue because the current
implementation doesn't work and is not even documented.

Tested-by: Darren Etheridge <detheridge@ti.com>
Tested-by: Johannes Pointner <johannes.pointner@br-automation.com>
Signed-off-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Ezequiel Garcia 2014-09-02 09:51:20 -03:00 committed by Dave Airlie
parent 971645d1fd
commit 18c44db8ca
2 changed files with 23 additions and 5 deletions
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5
Documentation/devicetree/bindings/drm/tilcdc/panel.txt
View File

@ -18,6 +18,9 @@ Required properties:
Documentation/devicetree/bindings/video/display-timing.txt for display
timing binding details.
Optional properties:
- backlight: phandle of the backlight device attached to the panel
Recommended properties:
- pinctrl-names, pinctrl-0: the pincontrol settings to configure
muxing properly for pins that connect to TFP410 device
@ -29,6 +32,8 @@ Example:
compatible = "ti,tilcdc,panel";
pinctrl-names = "default";
pinctrl-0 = <&bone_lcd3_cape_lcd_pins>;
backlight = <&backlight>;
panel-info {
ac-bias = <255>;
ac-bias-intrpt = <0>;

23
drivers/gpu/drm/tilcdc/tilcdc_panel.c
View File

@ -342,7 +342,7 @@ static struct tilcdc_panel_info *of_get_panel_info(struct device_node *np)
static int panel_probe(struct platform_device *pdev)
{
struct device_node *node = pdev->dev.of_node;
struct device_node *bl_node, *node = pdev->dev.of_node;
struct panel_module *panel_mod;
struct tilcdc_module *mod;
struct pinctrl *pinctrl;
@ -358,6 +358,17 @@ static int panel_probe(struct platform_device *pdev)
if (!panel_mod)
return -ENOMEM;
bl_node = of_parse_phandle(node, "backlight", 0);
if (bl_node) {
panel_mod->backlight = of_find_backlight_by_node(bl_node);
of_node_put(bl_node);
if (!panel_mod->backlight)
return -EPROBE_DEFER;
dev_info(&pdev->dev, "found backlight\n");
}
mod = &panel_mod->base;
pdev->dev.platform_data = mod;
@ -381,10 +392,6 @@ static int panel_probe(struct platform_device *pdev)
mod->preferred_bpp = panel_mod->info->bpp;
panel_mod->backlight = of_find_backlight_by_node(node);
if (panel_mod->backlight)
dev_info(&pdev->dev, "found backlight\n");
return 0;
fail_timings:
@ -392,6 +399,8 @@ fail_timings:
fail_free:
tilcdc_module_cleanup(mod);
if (panel_mod->backlight)
put_device(&panel_mod->backlight->dev);
return ret;
}
@ -399,6 +408,10 @@ static int panel_remove(struct platform_device *pdev)
{
struct tilcdc_module *mod = dev_get_platdata(&pdev->dev);
struct panel_module *panel_mod = to_panel_module(mod);
struct backlight_device *backlight = panel_mod->backlight;
if (backlight)
put_device(&backlight->dev);
display_timings_release(panel_mod->timings);