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mfd: max8925: Support dt for backlight 

Add device tree support in max8925 backlight.

Signed-off-by: Qing Xu <qingx@marvell.com>
Signed-off-by: Haojian Zhuang <haojian.zhuang@gmail.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Qing Xu 2013-02-04 23:40:45 +08:00 committed by Samuel Ortiz
parent 678e8cb506
commit 47ec340cb8
1 changed files with 30 additions and 1 deletions
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31
drivers/video/backlight/max8925_bl.c
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@ -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: