diff options
| author | Qing Xu <qingx@marvell.com> | 2013-02-04 19:40:45 +0400 |
|---|---|---|
| committer | Samuel Ortiz <sameo@linux.intel.com> | 2013-02-14 03:23:01 +0400 |
| commit | 47ec340cb8e232671e7c4a4689ff32c3bdf329da (patch) | |
| tree | 1eae1199083af89a5519bddba4dc1fc04319dcf8 /drivers/video/backlight/max8925_bl.c | |
| parent | 678e8cb50647a7580b8122937e8e6e50d949267d (diff) | |
| download | linux-47ec340cb8e232671e7c4a4689ff32c3bdf329da.tar.xz | |
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>
Diffstat (limited to 'drivers/video/backlight/max8925_bl.c')
| -rw-r--r-- | 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 2c9bce050aa9..5ca11b066b7e 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: |