From 506c2ba6c7064692a11bf18b0a9ed935a6055ffc Mon Sep 17 00:00:00 2001
From: Clyde Stubbs <2366188+clydebarrow@users.noreply.github.com>
Date: Wed, 4 Oct 2023 12:10:26 +1100
Subject: [PATCH] ST7789v - Allow predefined backlight pin to be disabled.
 (#5476)

* Allow predefined backlight pin to be disabled.

* Add test

* Update esphome/components/st7789v/display.py
---
 esphome/components/st7789v/display.py | 7 +++++--
 tests/test1.yaml                      | 2 +-
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/esphome/components/st7789v/display.py b/esphome/components/st7789v/display.py
index ad152bf356..a4c08974c6 100644
--- a/esphome/components/st7789v/display.py
+++ b/esphome/components/st7789v/display.py
@@ -138,7 +138,10 @@ CONFIG_SCHEMA = cv.All(
             cv.Required(CONF_MODEL): cv.one_of(*MODELS.keys(), upper=True, space="_"),
             cv.Optional(CONF_RESET_PIN): pins.gpio_output_pin_schema,
             cv.Optional(CONF_DC_PIN): pins.gpio_output_pin_schema,
-            cv.Optional(CONF_BACKLIGHT_PIN): pins.gpio_output_pin_schema,
+            cv.Optional(CONF_BACKLIGHT_PIN): cv.Any(
+                cv.boolean,
+                pins.gpio_output_pin_schema,
+            ),
             cv.Optional(CONF_POWER_SUPPLY): cv.use_id(power_supply.PowerSupply),
             cv.Optional(CONF_EIGHTBITCOLOR, default=False): cv.boolean,
             cv.Optional(CONF_HEIGHT): cv.int_,
@@ -174,7 +177,7 @@ async def to_code(config):
     reset = await cg.gpio_pin_expression(config[CONF_RESET_PIN])
     cg.add(var.set_reset_pin(reset))
 
-    if CONF_BACKLIGHT_PIN in config:
+    if CONF_BACKLIGHT_PIN in config and config[CONF_BACKLIGHT_PIN]:
         bl = await cg.gpio_pin_expression(config[CONF_BACKLIGHT_PIN])
         cg.add(var.set_backlight_pin(bl))
 
diff --git a/tests/test1.yaml b/tests/test1.yaml
index 11ce86c5f3..ea69343dbf 100644
--- a/tests/test1.yaml
+++ b/tests/test1.yaml
@@ -2948,7 +2948,7 @@ display:
     cs_pin: GPIO5
     dc_pin: GPIO16
     reset_pin: GPIO23
-    backlight_pin: GPIO4
+    backlight_pin: no
     lambda: |-
       it.rectangle(0, 0, it.get_width(), it.get_height());
   - platform: st7920