Hello
I am trying to configure two mcp2515 CAN controllers and bind them to the mcp251x kernel driver.
I managed to get the first one working using Chip Select 0
I saw that cs-gpio can be used to use a GPIO pin as an extra CHIP select
Is it possible to directly map de second CHIP SELECT using a GPIO on the following device tree overlay ?
/dts-v1/;
/plugin/;
/ {
compatible = "rockchip,rockpi","rockchip,rk3399";
/* enable spi-dev for spi1 */
fragment@0 {
target = <&spi1>;
__overlay__ {
status = "okay";
};
};
/* the interrupt pin of the can-controller */
/* Hat uses physical pin 22 (GPIO4_D5) which translate to gpio 157 */
fragment@1 {
target = <&pinctrl>;
__overlay__ {
can1_pins: can1_pins {
rockchip,pins = <4 157 0 &pcfg_output_low>;
};
};
};
/* the clock/oscillator of the can-controller */
fragment@2 {
target-path = "/";
__overlay__ {
/* external oscillator of mcp2515 on SPI1 */
can1_osc: can1_osc {
compatible = "fixed-clock";
#clock-cells = <0>;
clock-frequency = <16000000>;
clock-output-names = "can1_osc";
};
};
};
/* the spi config of the can-controller itself binding everything together */
fragment@3 {
target = <&spi1>;
__overlay__ {
#address-cells = <1>;
#size-cells = <0>;
can1: mcp2515@1 {
reg = <1>;
compatible = "microchip,mcp2515";
pinctrl-names = "default";
#pinctrl-0 = <&can1_pins>;
spi-max-frequency = <10000000>;
interrupt-parent = <&gpio4>;
interrupts = <22 8>;
clocks = <&can1_osc>;
};
};
};
__overrides__ {
oscillator = <&can1_osc>,"clock-frequency:0";
spimaxfrequency = <&can1>,"spi-max-frequency:0";
interrupt = <&can1_pins>,"rockchip,pins:0",<&can1>,"interrupts:0";
};
};
Thanks in advance
