From 7e4cf8308d74d9aa7d9666c88fcf815aecc18775 Mon Sep 17 00:00:00 2001
From: TOKITA Hiroshi <tokita.hiroshi@gmail.com>
Date: Wed, 13 Apr 2022 09:42:50 +0900
Subject: [PATCH] drivers: display: st7735r: added inversion-on property

Add 'inversion-on' property to st7735r.
Issue INVON(21h) command on initializing if inversion-on was enabled.
As a result of this command, the display color is inverted.
Otherwise, INVOFF(20h) will be issued.

Signed-off-by: TOKITA Hiroshi <tokita.hiroshi@gmail.com>
---
 drivers/display/display_st7735r.c          | 8 +++++++-
 dts/bindings/display/sitronix,st7735r.yaml | 6 ++++++
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/display/display_st7735r.c b/drivers/display/display_st7735r.c
index 3309b183f16..f9466a7c3f0 100644
--- a/drivers/display/display_st7735r.c
+++ b/drivers/display/display_st7735r.c
@@ -50,6 +50,7 @@ struct st7735r_config {
 	uint8_t frmctr3[6];
 	uint8_t gamctrp1[16];
 	uint8_t gamctrn1[16];
+	bool inversion_on;
 };
 
 struct st7735r_data {
@@ -377,7 +378,11 @@ static int st7735r_lcd_init(const struct device *dev)
 		return ret;
 	}
 
-	ret = st7735r_transmit(dev, ST7735R_CMD_INV_OFF, NULL, 0);
+	if (config->inversion_on) {
+		ret = st7735r_transmit(dev, ST7735R_CMD_INV_ON, NULL, 0);
+	} else {
+		ret = st7735r_transmit(dev, ST7735R_CMD_INV_OFF, NULL, 0);
+	}
 	if (ret < 0) {
 		return ret;
 	}
@@ -545,6 +550,7 @@ static const struct display_driver_api st7735r_api = {
 		.frmctr3 = DT_INST_PROP(inst, frmctr3),				\
 		.gamctrp1 = DT_INST_PROP(inst, gamctrp1),			\
 		.gamctrn1 = DT_INST_PROP(inst, gamctrn1),			\
+		.inversion_on = DT_INST_PROP(inst, inversion_on),		\
 	};									\
 										\
 	static struct st7735r_data st7735r_data_ ## inst = {			\
diff --git a/dts/bindings/display/sitronix,st7735r.yaml b/dts/bindings/display/sitronix,st7735r.yaml
index d2f0faf22a3..96cf4f2c67f 100644
--- a/dts/bindings/display/sitronix,st7735r.yaml
+++ b/dts/bindings/display/sitronix,st7735r.yaml
@@ -117,3 +117,9 @@ properties:
       description: |
         Display Inversion Control
         Set dot inversion or line inversion for each normal/idle/partial mode.
+
+    inversion-on:
+      type: boolean
+      description: |
+        Enable Display Inversion
+        Make a drawing with the inverted color of the frame memory.