From: Bjorn Andersson <[email protected]> Implement support for initialization of the lm3533 backlight from Device Tree.
Acked-by: Jingoo Han <[email protected]> Acked-by: Pavel Machek <[email protected]> Signed-off-by: Bjorn Andersson <[email protected]> Signed-off-by: Bjorn Andersson <[email protected]> --- Note that this patch can be merged independently of the other patches in the series, pending approval of the DT binding. Changes since v4: - Acks from Pavel and Jingoo Changes since v3: - Moved backlight DT parsing from mfd driver - Gave driver its own compatible drivers/video/backlight/lm3533_bl.c | 98 +++++++++++++++++++++++++++++++++++-- 1 file changed, 95 insertions(+), 3 deletions(-) diff --git a/drivers/video/backlight/lm3533_bl.c b/drivers/video/backlight/lm3533_bl.c index 0e2337f367b6..2f132199e604 100644 --- a/drivers/video/backlight/lm3533_bl.c +++ b/drivers/video/backlight/lm3533_bl.c @@ -22,6 +22,7 @@ #define LM3533_HVCTRLBANK_COUNT 2 +#define LM3533_BL_DEFAULT_BRIGHTNESS 200 #define LM3533_BL_MAX_BRIGHTNESS 255 #define LM3533_REG_CTRLBANK_AB_BCONF 0x1a @@ -269,6 +270,86 @@ static int lm3533_bl_setup(struct lm3533_bl *bl, return lm3533_ctrlbank_set_pwm(&bl->cb, pdata->pwm); } +static int lm3533_of_parse_pwm_zones(struct device_node *node) +{ + const char *propname = "ti,pwm-zones"; + u32 zones[5]; + int count; + int ret; + int i; + + count = of_property_count_u32_elems(node, propname); + if (count == -EINVAL) + return 0; + if (count <= 0) + return count; + if (count >= ARRAY_SIZE(zones)) + return -EINVAL; + + ret = of_property_read_u32_array(node, propname, zones, count); + if (ret < 0) + return ret; + + /* Enable pwm input, and enable the selected zones */ + ret = BIT(0); + for (i = 0; i < count; i++) + ret |= BIT(zones[i] + 1); + + return ret; +} + +static struct lm3533_bl_platform_data *lm3533_bl_of_parse(struct device *dev, + int *id) +{ + struct lm3533_bl_platform_data *bl_pdata; + struct device_node *node = dev->of_node; + int ret; + u32 reg; + u32 val; + + bl_pdata = devm_kzalloc(dev, sizeof(*bl_pdata), GFP_KERNEL); + if (!bl_pdata) + return NULL; + + ret = of_property_read_u32(node, "reg", ®); + if (ret < 0) { + dev_err(dev, "invalid reg property\n"); + return NULL; + } + *id = reg; + + ret = of_property_read_string(node, "label", + (const char **)&bl_pdata->name); + if (ret < 0) { + dev_err(dev, "unable to parse label\n"); + return NULL; + } + + ret = of_property_read_u32(node, "led-max-microamp", &val); + if (ret < 0) { + dev_err(dev, "unable to parse led-max-microamp\n"); + return NULL; + } + bl_pdata->max_current = val; + + val = LM3533_BL_DEFAULT_BRIGHTNESS; + ret = of_property_read_u32(node, "default-brightness", &val); + if (ret < 0 && ret != -EINVAL) { + dev_err(dev, "unable to parse default-brightness\n"); + return NULL; + } + bl_pdata->default_brightness = val; + + ret = lm3533_of_parse_pwm_zones(node); + if (ret < 0) { + dev_err(dev, "failed to parse ti,pwm-zones\n"); + return NULL; + } + bl_pdata->pwm = ret; + + return bl_pdata; +} + static int lm3533_bl_probe(struct platform_device *pdev) { struct lm3533 *lm3533; @@ -277,6 +358,7 @@ static int lm3533_bl_probe(struct platform_device *pdev) struct backlight_device *bd; struct backlight_properties props; int ret; + int id; dev_dbg(&pdev->dev, "%s\n", __func__); @@ -284,14 +366,17 @@ static int lm3533_bl_probe(struct platform_device *pdev) if (!lm3533) return -EINVAL; + id = pdev->id; pdata = dev_get_platdata(&pdev->dev); + if (!pdata) + pdata = lm3533_bl_of_parse(&pdev->dev, &id); if (!pdata) { dev_err(&pdev->dev, "no platform data\n"); return -EINVAL; } - if (pdev->id < 0 || pdev->id >= LM3533_HVCTRLBANK_COUNT) { - dev_err(&pdev->dev, "illegal backlight id %d\n", pdev->id); + if (id < 0 || id >= LM3533_HVCTRLBANK_COUNT) { + dev_err(&pdev->dev, "illegal backlight id %d\n", id); return -EINVAL; } @@ -300,7 +385,7 @@ static int lm3533_bl_probe(struct platform_device *pdev) return -ENOMEM; bl->lm3533 = lm3533; - bl->id = pdev->id; + bl->id = id; bl->cb.lm3533 = lm3533; bl->cb.id = lm3533_bl_get_ctrlbank_id(bl); @@ -394,10 +479,17 @@ static void lm3533_bl_shutdown(struct platform_device *pdev) lm3533_ctrlbank_disable(&bl->cb); } +static const struct of_device_id lm3533_bl_of_match[] = { + { .compatible = "ti,lm3533-backlight", }, + { }, +}; +MODULE_DEVICE_TABLE(of, lm3533_bl_of_match); + static struct platform_driver lm3533_bl_driver = { .driver = { .name = "lm3533-backlight", .pm = &lm3533_bl_pm_ops, + .of_match_table = lm3533_bl_of_match, }, .probe = lm3533_bl_probe, .remove = lm3533_bl_remove, -- 2.11.0
