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    Subject[PATCH 6/7] mfd: max8925: support dt for backlight
    Date
    From: Qing Xu <qingx@marvell.com>

    Signed-off-by: Qing Xu <qingx@marvell.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..7de02ed 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, "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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