Merge tag 'backlight-for-linus-4.4' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/backlight

Pull backlight updates from Lee Jones:
"New Device Support
- None

New Functionality:
- None

Core Frameworks:
- Reject legacy PWM request for device defined in DT

Fix-ups:
- Remove unnecessary MODULE_ALIAS(); adp8860_bl, adp8870_bl
- Simplify code: pm8941-wled
- Supply default-brightness logic; pm8941-wled

Bug Fixes:
- Clean up OF node; 88pm860x_bl
- Ensure struct is zeroed; lp855x_bl"

* tag 'backlight-for-linus-4.4' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/backlight:
backlight: pm8941-wled: Add default-brightness property
backlight: pm8941-wled: Fix ptr_ret.cocci warnings
backlight: pwm: Reject legacy PWM request for device defined in DT
backlight: 88pm860x_bl: Add missing of_node_put
backlight: adp8870: Remove unnecessary MODULE_ALIAS()
backlight: adp8860: Remove unnecessary MODULE_ALIAS()
backlight: lp855x: Make sure props struct is zeroed

Documentation/devicetree/bindings/video/backlight/pm8941-wled.txt

···
 - reg: slave address
 
 Optional properties:
+- default-brightness: brightness value on boot, value from: 0-4095
+	default: 2048
 - label: The name of the backlight device
 - qcom,cs-out: bool; enable current sink output
 - qcom,cabc: bool; enable content adaptive backlight control

drivers/video/backlight/88pm860x_bl.c

···
 			data->iset = PM8606_WLED_CURRENT(iset);
 			of_property_read_u32(np, "marvell,88pm860x-pwm",
 					     &data->pwm);
+			of_node_put(np);
 			break;
 		}
 	}

drivers/video/backlight/adp8860_bl.c

···
 MODULE_LICENSE("GPL v2");
 MODULE_AUTHOR("Michael Hennerich <[e-mail]>");
 MODULE_DESCRIPTION("ADP8860 Backlight driver");
-MODULE_ALIAS("i2c:adp8860-backlight");

drivers/video/backlight/adp8870_bl.c

···
 MODULE_LICENSE("GPL v2");
 MODULE_AUTHOR("Michael Hennerich <[e-mail]>");
 MODULE_DESCRIPTION("ADP8870 Backlight driver");
-MODULE_ALIAS("i2c:adp8870-backlight");

drivers/video/backlight/lp855x_bl.c

···
 	struct lp855x_platform_data *pdata = lp->pdata;
 	const char *name = pdata->name ? : DEFAULT_BL_NAME;
 
+	memset(&props, 0, sizeof(props));
 	props.type = BACKLIGHT_PLATFORM;
 	props.max_brightness = MAX_BRIGHTNESS;
 

drivers/video/backlight/pm8941-wled.c

···
 #include <linux/of_device.h>
 #include <linux/regmap.h>
 
+/* From DT binding */
+#define PM8941_WLED_DEFAULT_BRIGHTNESS		2048
+
 #define PM8941_WLED_REG_VAL_BASE		0x40
 #define  PM8941_WLED_REG_VAL_MAX		0xFFF
 
···
 	struct backlight_device *bl;
 	struct pm8941_wled *wled;
 	struct regmap *regmap;
+	u32 val;
 	int rc;
 
 	regmap = dev_get_regmap(pdev->dev.parent, NULL);
···
 	if (rc)
 		return rc;
 
+	val = PM8941_WLED_DEFAULT_BRIGHTNESS;
+	of_property_read_u32(pdev->dev.of_node, "default-brightness", &val);
+
 	memset(&props, 0, sizeof(struct backlight_properties));
 	props.type = BACKLIGHT_RAW;
+	props.brightness = val;
 	props.max_brightness = PM8941_WLED_REG_VAL_MAX;
 	bl = devm_backlight_device_register(&pdev->dev, wled->name,
 					    &pdev->dev, wled,
 					    &pm8941_wled_ops, &props);
-	if (IS_ERR(bl))
-		return PTR_ERR(bl);
-
-	return 0;
+	return PTR_ERR_OR_ZERO(bl);
 };
 
 static const struct of_device_id pm8941_wled_match_table[] = {

drivers/video/backlight/pwm_bl.c

···
 	}
 
 	pb->pwm = devm_pwm_get(&pdev->dev, NULL);
-	if (IS_ERR(pb->pwm)) {
-		ret = PTR_ERR(pb->pwm);
-		if (ret == -EPROBE_DEFER)
-			goto err_alloc;
-
+	if (IS_ERR(pb->pwm) && PTR_ERR(pb->pwm) != -EPROBE_DEFER
+	    && !pdev->dev.of_node) {
 		dev_err(&pdev->dev, "unable to request PWM, trying legacy API\n");
 		pb->legacy = true;
 		pb->pwm = pwm_request(data->pwm_id, "pwm-backlight");
-		if (IS_ERR(pb->pwm)) {
-			dev_err(&pdev->dev, "unable to request legacy PWM\n");
-			ret = PTR_ERR(pb->pwm);
-			goto err_alloc;
-		}
+	}
+
+	if (IS_ERR(pb->pwm)) {
+		ret = PTR_ERR(pb->pwm);
+		if (ret != -EPROBE_DEFER)
+			dev_err(&pdev->dev, "unable to request PWM\n");
+		goto err_alloc;
 	}
 
 	dev_dbg(&pdev->dev, "got pwm for backlight\n");