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Commit 47ec340c authored by Qing Xu's avatar Qing Xu Committed by Samuel Ortiz
Browse files

mfd: max8925: Support dt for backlight 



Add device tree support in max8925 backlight.

Signed-off-by: default avatarQing Xu <qingx@marvell.com>
Signed-off-by: default avatarHaojian Zhuang <haojian.zhuang@gmail.com>
Signed-off-by: default avatarSamuel Ortiz <sameo@linux.intel.com>
parent 678e8cb5

drivers/video/backlight/max8925_bl.c

+30 −1
Original line number Diff line number Diff line
@@ -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: