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Subject[PATCH 4/6] mfd: max8925: support dt for backlight
Date
From: Qing Xu <qingx@marvell.com>

Add device tree support in max8925 backlight.

Signed-off-by: Qing Xu <qingx@marvell.com>
Signed-off-by: Haojian Zhuang <haojian.zhuang@gmail.com>
---
drivers/video/backlight/max8925_bl.c | 31 ++++++++++++++++++++++++++++++-
1 file changed, 30 insertions(+), 1 deletion(-)

diff --git a/drivers/video/backlight/max8925_bl.c b/drivers/video/backlight/max8925_bl.c
index 2c9bce0..5ca11b0 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, "maxim,max8925-dual-string", &dual_string);
+ pdata->dual_string = dual_string;
+ return 0;
+}
+#else
+#define max8925_backlight_dt_init(x, y) (-1)
+#endif
+
static int max8925_backlight_probe(struct platform_device *pdev)
{
struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
@@ -147,6 +170,13 @@ static int 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);
@@ -158,7 +188,6 @@ static int 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:
--
1.7.10.4


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