linux-kernel - [RFC PATCH v2 3/3] Add Device Tree Bindings for mikroBUS port

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Message-Id: <20200818124815.11029-4-vaishnav@beagleboard.org>
Date:   Tue, 18 Aug 2020 18:18:15 +0530
From:   Vaishnav M A <vaishnav@...gleboard.org>
To:     greybus-dev@...ts.linaro.org, linux-kernel@...r.kernel.org,
        gregkh@...uxfoundation.org, arnd@...db.de, johan@...nel.org,
        elder@...nel.org
Cc:     Vaishnav M A <vaishnav@...gleboard.org>, robh@...nel.org,
        mchehab+huawei@...nel.org, davem@...emloft.net,
        jkridner@...gleboard.org, drew@...gleboard.org,
        robertcnelson@...gleboard.org, rajkovic@...roe.com,
        chrisfriedt@...il.com, zoran.stojsavljevic@...il.com
Subject: [RFC PATCH v2 3/3] Add Device Tree Bindings for mikroBUS port

This patch adds device tree bindings for the mikroBUS port,
device tree overlays for the mikrobus Port on the BeagleBoard.org
PocketBeagle is available here :
github.com/beagleboard/bb.org-overlays/blob/master/src/arm/PB-MIKROBUS-0.dts

Signed-off-by: Vaishnav M A <vaishnav@...gleboard.org>
---
 .../bindings/misc/linux,mikrobus.txt          | 81 +++++++++++++++++++
 1 file changed, 81 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/misc/linux,mikrobus.txt

diff --git a/Documentation/devicetree/bindings/misc/linux,mikrobus.txt b/Documentation/devicetree/bindings/misc/linux,mikrobus.txt
new file mode 100644
index 000000000000..99f75caf5f35
--- /dev/null
+++ b/Documentation/devicetree/bindings/misc/linux,mikrobus.txt
@@ -0,0 +1,81 @@
+mikroBUS add-on board socket
+
+Required properties:
+- compatible: Must be "linux,mikrobus"
+- i2c-adapter:  phandle to the i2c adapter attached to the mikrobus socket.
+- spi-master: spi bus number of the spi-master attached to the mikrobus socket.
+- spi-cs: spi chip-select numbers corresponding to the chip-selects
+	  on the mikrobus socket(0 -> chip select corresponding to CS pin
+	  1 -> chip select corresponding to RST pin).
+- serdev-controller:  phandle to the uart port attached to the mikrobus socket.
+- pwms: phandle to the pwm-controller corresponding to the mikroBUS PWM pin.
+- mikrobus-gpios: gpios array corresponding to GPIOs on the mikroBUS port,
+		  for targets not supporting the AN pin on the mikroBUS port as
+		  GPIO, the length of the gpios array can be 11, otherwise it
+		  should be 12.
+- pinctrl-names: pinctrl state names to support additional pin usage/deviations
+		 from mikroBUS socket standard usage, must be "default",
+		 "pwm_default", "pwm_gpio", "uart_default", "uart_gpio",
+		 "i2c_default", "i2c_gpio", "spi_default", "spi_gpio", these
+		 pinctrl names should have corresponding pinctrl-N entries which
+		 corresponds to the pinmux state for the pingroup, for example,
+		 i2c_default corresponds to the state where the I2C pin group
+		 (SCL,SDA) are configured in I2C mode and i2c_gpio mode corresponds
+		 to the pinmux state where these pins are configured as GPIO.
+- pinctrl-N : pinctrl-(0-8) corresponds to the pinctrl states for the states described
+	      above.
+
+Example:
+	mikrobus-0 {
+		compatible = "linux,mikrobus";
+		status = "okay";
+		pinctrl-names = "default", "pwm_default", "pwm_gpio",
+				"uart_default", "uart_gpio", "i2c_default",
+				"i2c_gpio", "spi_default", "spi_gpio";
+		pinctrl-0 = <
+			&P2_03_gpio_input_pin
+			&P1_04_gpio_pin
+			&P1_02_gpio_pin
+		>;
+		pinctrl-1 = <&P2_01_pwm_pin>;
+		pinctrl-2 = <&P2_01_gpio_pin>;
+		pinctrl-3 = <
+			&P2_05_uart_pin
+			&P2_07_uart_pin
+		>;
+		pinctrl-4 = <
+			&P2_05_gpio_pin
+			&P2_07_gpio_pin
+		>;
+		pinctrl-5 = <
+			&P2_09_i2c_pin
+			&P2_11_i2c_pin
+		>;
+		pinctrl-6 = <
+			&P2_09_gpio_pin
+			&P2_11_gpio_pin
+		>;
+		pinctrl-7 = <
+			&P1_12_spi_pin
+			&P1_10_spi_pin
+			&P1_08_spi_sclk_pin
+			&P1_06_spi_cs_pin
+		>;
+		pinctrl-8 = <
+			&P1_12_gpio_pin
+			&P1_10_gpio_pin
+			&P1_08_gpio_pin
+			&P1_06_gpio_pin
+		>;
+		i2c-adapter = <&i2c1>;
+		spi-master = <0>;
+		spi-cs = <0 1>;
+		serdev-controller = <&uart4>;
+		pwms = <&ehrpwm1 0 500000 0>;
+		mikrobus-gpios = <&gpio1 18 0> , <&gpio0 23 0>,
+					<&gpio0 30 0> , <&gpio0 31 0>,
+					<&gpio0 15 0> , <&gpio0 14 0>,
+					<&gpio0 4 0> , <&gpio0 3 0>,
+					<&gpio0 2 0> , <&gpio0 5 0>,
+					<&gpio2 25 0>  , <&gpio2 3 0>;
+	};
\ No newline at end of file
-- 
2.25.1