video: backlight: lm3533: add more flexibility with device tree

Configure LM3533 based on preliminary device tree configuration.

Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>

diff --git a/drivers/video/lm3533_backlight.c b/drivers/video/lm3533_backlight.c
index 6b51fa0..a1a7397 100644 (file)
--- a/drivers/video/lm3533_backlight.c
+++ b/drivers/video/lm3533_backlight.c
@@ -7,6 +7,7 @@
 
 #include <backlight.h>
 #include <dm.h>
+#include <dm/ofnode.h>
 #include <i2c.h>
 #include <log.h>
 #include <linux/delay.h>
@@ -24,9 +25,23 @@
 #define LM3533_OVP_FREQUENCY_PWM_POLARITY              0x2C
 #define LM3533_BRIGHTNESS_REGISTER_A                   0x40
 
+#define LM3533_BOOST_OVP_16V                           16000000UL
+#define LM3533_BOOST_FREQ_500KHZ                       500000UL
+
 struct lm3533_backlight_priv {
        struct gpio_desc enable_gpio;
        u32 def_bl_lvl;
+
+       /* Core */
+       u32 boost_ovp;
+       u32 boost_freq;
+
+       /* Backlight */
+       u32 reg;
+       u16 max_current;                /* 5000 - 29800 uA (800 uA step) */
+       u8 pwm;                         /* 0 - 0x3f */
+       bool linear;
+       bool hvled;
 };
 
 static int lm3533_backlight_enable(struct udevice *dev)
@@ -92,14 +107,12 @@ static int lm3533_backlight_set_brightness(struct udevice *dev, int percent)
        return 0;
 }
 
-static int lm3533_backlight_probe(struct udevice *dev)
+static int lm3533_backlight_of_to_plat(struct udevice *dev)
 {
        struct lm3533_backlight_priv *priv = dev_get_priv(dev);
+       ofnode child;
        int ret;
 
-       if (device_get_uclass_id(dev->parent) != UCLASS_I2C)
-               return -EPROTONOSUPPORT;
-
        ret = gpio_request_by_name(dev, "enable-gpios", 0,
                                   &priv->enable_gpio, GPIOD_IS_OUT);
        if (ret) {
@@ -107,8 +120,47 @@ static int lm3533_backlight_probe(struct udevice *dev)
                return ret;
        }
 
-       priv->def_bl_lvl = dev_read_u32_default(dev, "default-brightness-level",
-                                               LM3533_BL_MAX_BRIGHTNESS);
+       priv->boost_ovp = dev_read_u32_default(dev, "ti,boost-ovp-microvolt",
+                                              LM3533_BOOST_OVP_16V);
+
+       /* boost_ovp is defined in microvolts, convert to enum value */
+       priv->boost_ovp = priv->boost_ovp / (8 * 1000 * 1000) - 2;
+
+       priv->boost_freq = dev_read_u32_default(dev, "ti,boost-freq-hz",
+                                               LM3533_BOOST_FREQ_500KHZ);
+
+       /* boost_freq is defined in Hz, convert to enum value */
+       priv->boost_freq = priv->boost_freq / (500 * 1000) - 1;
+
+       /* Backlight is one of children but has no dedicated driver */
+       ofnode_for_each_subnode(child, dev_ofnode(dev)) {
+               if (ofnode_device_is_compatible(child, "ti,lm3533-backlight")) {
+                       const char *node_name = ofnode_get_name(child);
+
+                       if (!strcmp(&node_name[10], "1"))
+                               priv->reg = 1;
+                       else
+                               priv->reg = 0;
+
+                       priv->max_current = ofnode_read_u32_default(child, "ti,max-current-microamp",
+                                                                   5000);
+                       priv->pwm = ofnode_read_u32_default(child, "ti,pwm-config-mask", 0);
+
+                       priv->def_bl_lvl = ofnode_read_u32_default(child, "default-brightness",
+                                                                  LM3533_BL_MAX_BRIGHTNESS);
+
+                       priv->linear = ofnode_read_bool(child, "ti,linear-mapping-mode");
+                       priv->hvled = ofnode_read_bool(child, "ti,hardware-controlled");
+               }
+       }
+
+       return 0;
+}
+
+static int lm3533_backlight_probe(struct udevice *dev)
+{
+       if (device_get_uclass_id(dev->parent) != UCLASS_I2C)
+               return -EPROTONOSUPPORT;
 
        return 0;
 }
@@ -127,6 +179,7 @@ U_BOOT_DRIVER(lm3533_backlight) = {
        .name           = "lm3533_backlight",
        .id             = UCLASS_PANEL_BACKLIGHT,
        .of_match       = lm3533_backlight_ids,
+       .of_to_plat     = lm3533_backlight_of_to_plat,
        .probe          = lm3533_backlight_probe,
        .ops            = &lm3533_backlight_ops,
        .priv_auto      = sizeof(struct lm3533_backlight_priv),