Add Stinger96 and IoT Box board support

From: Manivannan Sadhasivam <[email protected]>

These pinctrl definitions will be used by Stinger96/IoTBox boards from Shiratech.

Signed-off-by Manivannan Sadhasivam <[email protected]>

---
  arch/arm/boot/dts/stm32mp15-pinctrl.dtsi | 64 ++++++++++++++++++++++++
  1 file changed, 64 insertions(+)

arch/arm/boot/dts/stm32mp15-pinctrl.dtsi +64 -0

index aeddcaadb829..858c83038e5a 100644
@@ -1519,6 +1519,30 @@
  		};
  	};
 
+	usart2_pins_b: usart2-1 {
+		pins1 {
+			pinmux = <STM32_PINMUX('F', 5, AF7)>, /* USART2_TX */
+				 <STM32_PINMUX('A', 1, AF7)>; /* USART2_RTS */
+			bias-disable;
+			drive-push-pull;
+			slew-rate = <0>;
+		};
+		pins2 {
+			pinmux = <STM32_PINMUX('F', 4, AF7)>, /* USART2_RX */
+				 <STM32_PINMUX('E', 15, AF7)>; /* USART2_CTS_NSS */
+			bias-disable;
+		};
+	};
+
+	usart2_sleep_pins_b: usart2-sleep-1 {
+		pins {
+			pinmux = <STM32_PINMUX('F', 5, ANALOG)>, /* USART2_TX */
+				 <STM32_PINMUX('A', 1, ANALOG)>, /* USART2_RTS */
+				 <STM32_PINMUX('F', 4, ANALOG)>, /* USART2_RX */
+				 <STM32_PINMUX('E', 15, ANALOG)>; /* USART2_CTS_NSS */
+		};
+	};
+
  	usart3_pins_a: usart3-0 {
  		pins1 {
  			pinmux = <STM32_PINMUX('B', 10, AF7)>; /* USART3_TX */

@@ -1558,6 +1582,19 @@
  		};
  	};
 
+	uart4_pins_c: uart4-2 {
+		pins1 {
+			pinmux = <STM32_PINMUX('G', 11, AF6)>; /* UART4_TX */
+			bias-disable;
+			drive-push-pull;
+			slew-rate = <0>;
+		};
+		pins2 {
+			pinmux = <STM32_PINMUX('B', 2, AF8)>; /* UART4_RX */
+			bias-disable;
+		};
+	};
+
  	uart7_pins_a: uart7-0 {
  		pins1 {
  			pinmux = <STM32_PINMUX('E', 8, AF7)>; /* UART4_TX */

@@ -1573,6 +1610,19 @@
  		};
  	};
 
+	uart7_pins_b: uart7-1 {
+		pins1 {
+			pinmux = <STM32_PINMUX('F', 7, AF7)>; /* UART7_TX */
+			bias-disable;
+			drive-push-pull;
+			slew-rate = <0>;
+		};
+		pins2 {
+			pinmux = <STM32_PINMUX('F', 6, AF7)>; /* UART7_RX */
+			bias-disable;
+		};
+	};
+
  	uart8_pins_a: uart8-0 {
  		pins1 {
  			pinmux = <STM32_PINMUX('E', 1, AF8)>; /* UART8_TX */

@@ -1647,4 +1697,18 @@
  			bias-disable;
  		};
  	};
+
+	spi4_pins_a: spi4-0 {
+		pins {
+			pinmux = <STM32_PINMUX('E', 12, AF5)>, /* SPI4_SCK */
+				 <STM32_PINMUX('E', 6, AF5)>;  /* SPI4_MOSI */
+			bias-disable;
+			drive-push-pull;
+			slew-rate = <1>;
+		};
+		pins2 {
+			pinmux = <STM32_PINMUX('E', 13, AF5)>; /* SPI4_MISO */
+			bias-disable;
+		};
+	};
  };

From: Manivannan Sadhasivam <[email protected]>

IoT Box is an IoT gateway device based on Stinger96 board powered by STM32MP1 SoC, designed and manufactured by Shiratech Solutions. This device makes use of Stinger96 board by having it as a base board with one additional mezzanine on top.

Following are the features exposed by this device in addition to the Stinger96 board:

* WiFi/BT
* CCS811 VOC sensor
* 2x Digital microphones IM69D130
* 12x WS2812B LEDs

Following peripherals are tested and known to work:

* WiFi/BT
* CCS811

More information about this device can be found in Shiratech website:
https://www.shiratech-solutions.com/products/iot-box/

Signed-off-by Manivannan Sadhasivam <[email protected]>

---
  arch/arm/boot/dts/Makefile                |  1 +
  arch/arm/boot/dts/stm32mp157a-iot-box.dts | 92 +++++++++++++++++++++++
  2 files changed, 93 insertions(+)

create mode 100644 arch/arm/boot/dts/stm32mp157a-iot-box.dts

arch/arm/boot/dts/Makefile +1 -0

index 966b81dfffd6..455ec6eb6303 100644
@@ -1030,6 +1030,7 @@ dtb-$(CONFIG_ARCH_STM32) += \
  	stm32h743i-disco.dtb \
  	stm32mp157a-avenger96.dtb \
  	stm32mp157a-dk1.dtb \
+	stm32mp157a-iot-box.dtb \
  	stm32mp157a-stinger96.dtb \
  	stm32mp157c-dhcom-pdk2.dtb \
  	stm32mp157c-dk2.dtb \

arch/arm/boot/dts/stm32mp157a-iot-box.dts new file +24 -0

new file mode 100644
index 000000000000..fa1c006ce531
@@ -0,0 +1,92 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright (C) 2020 Manivannan Sadhasivam
+ */
+
+/dts-v1/;
+#include "stm32mp157a-stinger96.dtsi"
+
+/ {
+	model = "Shiratech STM32MP157A IoT Box";
+	compatible = "shiratech,stm32mp157a-iot-box", "st,stm32mp157";
+
+	wlan_pwr: regulator-wlan {
+		compatible = "regulator-fixed";
+
+		regulator-name = "wl-reg";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+
+		gpios = <&gpiog 3 GPIO_ACTIVE_HIGH>;
+		enable-active-high;
+	};
+};
+

arch/arm/boot/dts/stm32mp157a-iot-box.dts new file +48 -0

+	/*
+	 * Note: The SDMMC2 pins lack external pullups on data lines. Hence,
+	 * we need to enable it in the SoC.
+	 */
+	sdmmc2_b4_pins_pull: sdmmc2-b4-pull {
+		pins1 {
+			pinmux = <STM32_PINMUX('B', 14, AF9)>, /* SDMMC2_D0 */
+				 <STM32_PINMUX('B', 15, AF9)>, /* SDMMC2_D1 */
+				 <STM32_PINMUX('B', 3, AF9)>, /* SDMMC2_D2 */
+				 <STM32_PINMUX('B', 4, AF9)>, /* SDMMC2_D3 */
+				 <STM32_PINMUX('G', 6, AF10)>; /* SDMMC2_CMD */
+			slew-rate = <1>;
+			bias-pull-up;
+		};
+		pins2 {
+			pinmux = <STM32_PINMUX('E', 3, AF9)>; /* SDMMC2_CK */
+			slew-rate = <2>;
+			drive-push-pull;
+			bias-disable;
+		};
+	};
+};
+
+/* WiFi */
+&sdmmc2 {
+	pinctrl-names = "default", "opendrain", "sleep";
+	pinctrl-0 = <&sdmmc2_b4_pins_pull>;
+	pinctrl-1 = <&sdmmc2_b4_od_pins_b>;
+	pinctrl-2 = <&sdmmc2_b4_sleep_pins_a>;
+	broken-cd;
+	non-removable;
+	st,neg-edge;
+	bus-width = <1>;
+	vmmc-supply = <&wlan_pwr>;
+	status = "okay";
+
+	#address-cells = <1>;
+	#size-cells = <0>;
+	brcmf: bcrmf@1 {
+		reg = <1>;
+		compatible = "brcm,bcm4329-fmac";
+	};
+};
+
+/* Bluetooth */
+&uart4 {
+	/* Note: HW flow control is broken, hence using custom CTS/RTS gpios */
+	/delete-property/st,hw-flow-ctrl;