drivers: display: ili9340: move VCOM parameters to DT

Move VCOM control 1/2 register values to DT.

Signed-off-by: Gerard Marull-Paretas <gerard@teslabs.com>

boards/arc/hsdk/hsdk.dtsi

@@ -53,6 +53,8 @@
 		spi-max-frequency = <12000000>;
 		label = "DISPLAY";
 		pwctrl1 = [1b 00];
+		vmctrl1 = [3f 3c];
+		vmctrl2 = [b7];
 		pgamctrl = [0f 2a 28 08 0e 08 54 a9 43 0a 0f 00 00 00 00];
 		ngamctrl = [00 15 17 07 11 06 2b 56 3c 05 10 0f 3f 3f 0f];
 	};

boards/shields/adafruit_2_8_tft_touch_v2/adafruit_2_8_tft_touch_v2.overlay

@@ -20,6 +20,8 @@
 		pixel-format = <ILI9340_PIXEL_FORMAT_RGB888>;
 		rotation = <90>;
 		pwctrl1 = [23 00];
+		vmctrl1 = [3e 28];
+		vmctrl2 = [86];
 		pgamctrl = [0f 31 2b 0c 0e 08 4e f1 37 07 10 03 0e 09 00];
 		ngamctrl = [00 0e 14 03 11 07 31 c1 48 08 0f 0c 31 36 0f];
 	};

boards/shields/buydisplay_2_8_tft_touch_arduino/buydisplay_2_8_tft_touch_arduino.overlay

@@ -20,6 +20,8 @@
 		pixel-format = <ILI9340_PIXEL_FORMAT_RGB565>;
 		rotation = <0>;
 		pwctrl1 = [23 00];
+		vmctrl1 = [3e 28];
+		vmctrl2 = [86];
 		pgamctrl = [0f 31 2b 0c 0e 08 4e f1 37 07 10 03 0e 09 00];
 		ngamctrl = [00 0e 14 03 11 07 31 c1 48 08 0f 0c 31 36 0f];
 	};

drivers/display/display_ili9340.c

@@ -39,6 +39,8 @@ struct ili9340_config {
 	uint8_t gamset[ILI9340_GAMSET_LEN];
 	uint8_t pwctrl1[ILI9340_PWCTRL1_LEN];
 	uint8_t pwctrl2[ILI9340_PWCTRL2_LEN];
+	uint8_t vmctrl1[ILI9340_VMCTRL1_LEN];
+	uint8_t vmctrl2[ILI9340_VMCTRL2_LEN];
 	uint8_t pgamctrl[ILI9340_PGAMCTRL_LEN];
 	uint8_t ngamctrl[ILI9340_NGAMCTRL_LEN];
 };
@@ -390,6 +392,22 @@ static int ili9340_configure(const struct device *dev)
 		return r;
 	}
 
+	LOG_HEXDUMP_DBG(config->vmctrl1, ILI9340_VMCTRL1_LEN, "VMCTRL1");
+	memcpy(tx_data, config->vmctrl1, ILI9340_VMCTRL1_LEN);
+	r = ili9340_transmit(dev, ILI9340_CMD_VCOM_CTRL_1, tx_data,
+			     ILI9340_VMCTRL1_LEN);
+	if (r < 0) {
+		return r;
+	}
+
+	LOG_HEXDUMP_DBG(config->vmctrl2, ILI9340_VMCTRL2_LEN, "VMCTRL2");
+	memcpy(tx_data, config->vmctrl2, ILI9340_VMCTRL2_LEN);
+	r = ili9340_transmit(dev, ILI9340_CMD_VCOM_CTRL_2, tx_data,
+			     ILI9340_VMCTRL2_LEN);
+	if (r < 0) {
+		return r;
+	}
+
 	LOG_HEXDUMP_DBG(config->pgamctrl, ILI9340_PGAMCTRL_LEN, "PGAMCTRL");
 	memcpy(tx_data, config->pgamctrl, ILI9340_PGAMCTRL_LEN);
 	r = ili9340_transmit(dev, ILI9340_CMD_POSITIVE_GAMMA_CORRECTION,
@@ -527,6 +545,8 @@ static const struct display_driver_api ili9340_api = {
 		.gamset = DT_INST_PROP(index, gamset),                         \
 		.pwctrl1 = DT_INST_PROP(index, pwctrl1),                       \
 		.pwctrl2 = DT_INST_PROP(index, pwctrl2),                       \
+		.vmctrl1 = DT_INST_PROP(index, vmctrl1),                       \
+		.vmctrl2 = DT_INST_PROP(index, vmctrl2),                       \
 		.pgamctrl = DT_INST_PROP(index, pgamctrl),                     \
 		.ngamctrl = DT_INST_PROP(index, ngamctrl),                     \
 	};                                                                     \

drivers/display/display_ili9340.h

@@ -42,6 +42,8 @@
 #define ILI9340_GAMSET_LEN 1U
 #define ILI9340_PWCTRL1_LEN 2U
 #define ILI9340_PWCTRL2_LEN 1U
+#define ILI9340_VMCTRL1_LEN 2U
+#define ILI9340_VMCTRL2_LEN 1U
 #define ILI9340_PGAMCTRL_LEN 15U
 #define ILI9340_NGAMCTRL_LEN 15U
 

drivers/display/display_ili9340_adafruit_1480.c

@@ -11,19 +11,6 @@ int ili9340_lcd_init(const struct device *dev)
 	int r;
 	uint8_t tx_data[15];
 
-	tx_data[0] = 0x3e;
-	tx_data[1] = 0x28;
-	r = ili9340_transmit(dev, ILI9340_CMD_VCOM_CTRL_1, tx_data, 2);
-	if (r < 0) {
-		return r;
-	}
-
-	tx_data[0] = 0x86;
-	r = ili9340_transmit(dev, ILI9340_CMD_VCOM_CTRL_2, tx_data, 1);
-	if (r < 0) {
-		return r;
-	}
-
 	tx_data[0] = 0x00;
 	tx_data[1] = 0x18;
 	r = ili9340_transmit(dev, ILI9340_CMD_FRAME_CTRL_NORMAL_MODE, tx_data, 2);

drivers/display/display_ili9340_seeed_tftv2.c

@@ -82,23 +82,6 @@ int ili9340_lcd_init(const struct device *dev)
 		return r;
 	}
 
-	/* VCM control */
-	cmd = ILI9340_CMD_VCOM_CTRL_1;
-	data[0] = 0x3FU;
-	data[1] = 0x3CU;
-	r = ili9340_transmit(dev, cmd, data, 2);
-	if (r < 0) {
-		return r;
-	}
-
-	/* VCM control2 */
-	cmd = ILI9340_CMD_VCOM_CTRL_2;
-	data[0] = 0xB7U;
-	r = ili9340_transmit(dev, cmd, data, 1);
-	if (r < 0) {
-		return r;
-	}
-
 	/* Frame Rate */
 	cmd = ILI9340_CMD_FRAME_CTRL_NORMAL_MODE;
 	data[0] = 0x00U;

dts/bindings/display/ilitek,ili9340.yaml

@@ -66,6 +66,18 @@ properties:
       description:
         Power control 2 (PWCTRL2) register values.
 
+    vmctrl1:
+      type: uint8-array
+      default: [0x31, 0x3c]
+      description:
+        VCOM control 1 (VMCTRL1) register values.
+
+    vmctrl2:
+      type: uint8-array
+      default: [0xc0]
+      description:
+        VCOM control 2 (VMCTRL2) register values.
+
     pgamctrl:
       type: uint8-array
       default: [