linux-kernel - [PATCH v2 6/7] mfd: max8925: support dt for backlight

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Date:	Wed, 28 Nov 2012 10:06:45 +0800
From:	Qing Xu <qingx@...vell.com>
To:	qingx@...vell.com, sameo@...ux.intel.com,
	grant.likely@...retlab.ca, rob.herring@...xeda.com,
	rpurdie@...ys.net, FlorianSchandinat@....de,
	haojian.zhuang@...il.com, cxie4@...vell.com,
	linux-kernel@...r.kernel.org, devicetree-discuss@...ts.ozlabs.org
Subject: [PATCH v2 6/7] mfd: max8925: support dt for backlight

From: Qing Xu <qingx@...vell.com>

Signed-off-by: Qing Xu <qingx@...vell.com>
---
 drivers/video/backlight/max8925_bl.c |   31 ++++++++++++++++++++++++++++++-
 1 files changed, 30 insertions(+), 1 deletions(-)

diff --git a/drivers/video/backlight/max8925_bl.c b/drivers/video/backlight/max8925_bl.c
index f72ba54..1682d00 100644
--- a/drivers/video/backlight/max8925_bl.c
+++ b/drivers/video/backlight/max8925_bl.c
@@ -101,6 +101,29 @@ static const struct backlight_ops max8925_backlight_ops = {
 	.get_brightness	= max8925_backlight_get_brightness,
 };
 
+#ifdef CONFIG_OF
+static int max8925_backlight_dt_init(struct platform_device *pdev,
+			      struct max8925_backlight_pdata *pdata)
+{
+	struct device_node *nproot = pdev->dev.parent->of_node, *np;
+	int dual_string;
+
+	if (!nproot)
+		return -ENODEV;
+	np = of_find_node_by_name(nproot, "backlight");
+	if (!np) {
+		dev_err(&pdev->dev, "failed to find backlight node\n");
+		return -ENODEV;
+	}
+
+	of_property_read_u32(np, "max8925-dual-string", &dual_string);
+	pdata->dual_string = dual_string;
+	return 0;
+}
+#else
+#define max8925_backlight_dt_init(x, y)	(-1)
+#endif
+
 static int __devinit max8925_backlight_probe(struct platform_device *pdev)
 {
 	struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
@@ -150,6 +173,13 @@ static int __devinit max8925_backlight_probe(struct platform_device *pdev)
 	platform_set_drvdata(pdev, bl);
 
 	value = 0;
+	if (pdev->dev.parent->of_node && !pdata) {
+		pdata = devm_kzalloc(&pdev->dev,
+				     sizeof(struct max8925_backlight_pdata),
+				     GFP_KERNEL);
+		max8925_backlight_dt_init(pdev, pdata);
+	}
+
 	if (pdata) {
 		if (pdata->lxw_scl)
 			value |= (1 << 7);
@@ -161,7 +191,6 @@ static int __devinit max8925_backlight_probe(struct platform_device *pdev)
 	ret = max8925_set_bits(chip->i2c, data->reg_mode_cntl, 0xfe, value);
 	if (ret < 0)
 		goto out_brt;
-
 	backlight_update_status(bl);
 	return 0;
 out_brt:
-- 
1.7.0.4

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