ARM: dts: stm32: Add alternate pinmux for LTDC pins on stm32mp15

Add new mux option for LTDC pins, this is used on AV96 board.
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Alexandre Torgue <alexandre.torgue@st.com>
Cc: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com>
Cc: Patrice Chotard <patrice.chotard@st.com>
Cc: Patrick Delaunay <patrick.delaunay@st.com>
Cc: linux-stm32@st-md-mailman.stormreply.com
To: linux-arm-kernel@lists.infradead.org
Signed-off-by: Alexandre Torgue <alexandre.torgue@st.com>

arch/arm/boot/dts/stm32mp15-pinctrl.dtsi

@@ -662,6 +662,80 @@ pins1 {
 		};
 	};
 
+	ltdc_pins_d: ltdc-3 {
+		pins1 {
+			pinmux = <STM32_PINMUX('G',  7, AF14)>; /* LCD_CLK */
+			bias-disable;
+			drive-push-pull;
+			slew-rate = <3>;
+		};
+		pins2 {
+			pinmux = <STM32_PINMUX('I', 10, AF14)>, /* LCD_HSYNC */
+				 <STM32_PINMUX('I',  9, AF14)>, /* LCD_VSYNC */
+				 <STM32_PINMUX('E', 13, AF14)>, /* LCD_DE */
+				 <STM32_PINMUX('G', 13, AF14)>, /* LCD_R0 */
+				 <STM32_PINMUX('H',  3, AF14)>, /* LCD_R1 */
+				 <STM32_PINMUX('H',  8, AF14)>, /* LCD_R2 */
+				 <STM32_PINMUX('H',  9, AF14)>, /* LCD_R3 */
+				 <STM32_PINMUX('A',  5, AF14)>, /* LCD_R4 */
+				 <STM32_PINMUX('H', 11, AF14)>, /* LCD_R5 */
+				 <STM32_PINMUX('H', 12, AF14)>, /* LCD_R6 */
+				 <STM32_PINMUX('E', 15, AF14)>, /* LCD_R7 */
+				 <STM32_PINMUX('E',  5, AF14)>, /* LCD_G0 */
+				 <STM32_PINMUX('B',  0, AF14)>, /* LCD_G1 */
+				 <STM32_PINMUX('H', 13, AF14)>, /* LCD_G2 */
+				 <STM32_PINMUX('E', 11, AF14)>, /* LCD_G3 */
+				 <STM32_PINMUX('H', 15, AF14)>, /* LCD_G4 */
+				 <STM32_PINMUX('H',  4,  AF9)>, /* LCD_G5 */
+				 <STM32_PINMUX('I', 11,  AF9)>, /* LCD_G6 */
+				 <STM32_PINMUX('G',  8, AF14)>, /* LCD_G7 */
+				 <STM32_PINMUX('D',  9, AF14)>, /* LCD_B0 */
+				 <STM32_PINMUX('G', 12, AF14)>, /* LCD_B1 */
+				 <STM32_PINMUX('G', 10, AF14)>, /* LCD_B2 */
+				 <STM32_PINMUX('D', 10, AF14)>, /* LCD_B3 */
+				 <STM32_PINMUX('E', 12, AF14)>, /* LCD_B4 */
+				 <STM32_PINMUX('A',  3, AF14)>, /* LCD_B5 */
+				 <STM32_PINMUX('B',  8, AF14)>, /* LCD_B6 */
+				 <STM32_PINMUX('I',  7, AF14)>; /* LCD_B7 */
+			bias-disable;
+			drive-push-pull;
+			slew-rate = <2>;
+		};
+	};
+
+	ltdc_sleep_pins_d: ltdc-sleep-3 {
+		pins {
+			pinmux = <STM32_PINMUX('G',  7, ANALOG)>, /* LCD_CLK */
+				 <STM32_PINMUX('I', 10, ANALOG)>, /* LCD_HSYNC */
+				 <STM32_PINMUX('I',  9, ANALOG)>, /* LCD_VSYNC */
+				 <STM32_PINMUX('E', 13, ANALOG)>, /* LCD_DE */
+				 <STM32_PINMUX('G', 13, ANALOG)>, /* LCD_R0 */
+				 <STM32_PINMUX('H',  3, ANALOG)>, /* LCD_R1 */
+				 <STM32_PINMUX('H',  8, ANALOG)>, /* LCD_R2 */
+				 <STM32_PINMUX('H',  9, ANALOG)>, /* LCD_R3 */
+				 <STM32_PINMUX('A',  5, ANALOG)>, /* LCD_R4 */
+				 <STM32_PINMUX('H', 11, ANALOG)>, /* LCD_R5 */
+				 <STM32_PINMUX('H', 12, ANALOG)>, /* LCD_R6 */
+				 <STM32_PINMUX('E', 15, ANALOG)>, /* LCD_R7 */
+				 <STM32_PINMUX('E',  5, ANALOG)>, /* LCD_G0 */
+				 <STM32_PINMUX('B',  0, ANALOG)>, /* LCD_G1 */
+				 <STM32_PINMUX('H', 13, ANALOG)>, /* LCD_G2 */
+				 <STM32_PINMUX('E', 11, ANALOG)>, /* LCD_G3 */
+				 <STM32_PINMUX('H', 15, ANALOG)>, /* LCD_G4 */
+				 <STM32_PINMUX('H',  4, ANALOG)>, /* LCD_G5 */
+				 <STM32_PINMUX('I', 11, ANALOG)>, /* LCD_G6 */
+				 <STM32_PINMUX('G',  8, ANALOG)>, /* LCD_G7 */
+				 <STM32_PINMUX('D',  9, ANALOG)>, /* LCD_B0 */
+				 <STM32_PINMUX('G', 12, ANALOG)>, /* LCD_B1 */
+				 <STM32_PINMUX('G', 10, ANALOG)>, /* LCD_B2 */
+				 <STM32_PINMUX('D', 10, ANALOG)>, /* LCD_B3 */
+				 <STM32_PINMUX('E', 12, ANALOG)>, /* LCD_B4 */
+				 <STM32_PINMUX('A',  3, ANALOG)>, /* LCD_B5 */
+				 <STM32_PINMUX('B',  8, ANALOG)>, /* LCD_B6 */
+				 <STM32_PINMUX('I',  7, ANALOG)>; /* LCD_B7 */
+		};
+	};
+
 	m_can1_pins_a: m-can1-0 {
 		pins1 {
 			pinmux = <STM32_PINMUX('H', 13, AF9)>; /* CAN1_TX */