leds: leds-lp5569: Better handle enabling clock internal setting

Better handle enabling clock internal setting. In further testing it was
notice that internal clock config MUST be set before clock output config
or the LED CHIP might stop working.

This wasn't documented and was actually found on devices that have 2
chip chained where one chip provide clock for the other.

Signed-off-by: Christian Marangi <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Lee Jones <[email protected]>

Author: Ansuel

drivers/leds/leds-lp5569.c

@@ -180,20 +180,25 @@ static int lp5569_post_init_device(struct lp55xx_chip *chip)
 
 	val = LP5569_DEFAULT_CONFIG;
 	val |= FIELD_PREP(LP5569_CP_MODE_MASK, chip->pdata->charge_pump_mode);
+	ret = lp55xx_write(chip, LP5569_REG_MISC, val);
+	if (ret)
+		return ret;
 
 	if (chip->pdata->clock_mode == LP55XX_CLOCK_INT) {
+		/* Internal clock MUST be configured before CLK output */
+		ret = lp55xx_update_bits(chip, LP5569_REG_MISC,
+					 LP5569_INTERNAL_CLK,
+					 LP5569_INTERNAL_CLK);
+		if (ret)
+			return ret;
+
 		ret = lp55xx_update_bits(chip, LP5569_REG_IO_CONTROL,
 					 LP5569_CLK_OUTPUT,
 					 LP5569_CLK_OUTPUT);
 		if (ret)
 			return ret;
-
-		val |= LP5569_INTERNAL_CLK;
 	}
 
-	ret = lp55xx_write(chip, LP5569_REG_MISC, val);
-	if (ret)
-		return ret;
 
 	return lp5569_init_program_engine(chip);
 }