Re: [greybus-dev] [RFC PATCH v2 3/3] Add Device Tree Bindings for mikroBUS port

Hi Vaishnav,

Thank you for the patch.

On Tue, Aug 18, 2020 at 06:18:15PM +0530, Vaishnav M A wrote:

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@beagleboard.org

.../bindings/misc/linux,mikrobus.txt | 81 +++++++++++++++++++

Would you mind converting this binding document to YAML ? For new bindings we're trying to enforce usage of YAML, to avoid increasing the conversion backlog.

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>;
  

• };

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