I am working on a board that is derived from a Pocket Beagle.
It has two max81355 SPI Thermocouples on SPI0.
The first uses spi0_cs0 as a chip select.
spi0_cs1 is used for mmc.cd so that can not be used for the second.
The hardware designer used spio_d1(MOSI) set as a GPIO for the 2nd chip
select.
I have no clue how to set the device tree entry for that.
This is what I have - which I do not think can work.
fragment@1 {
target = <&am33xx_pinmux>;
__overlay__ {
pb_spi0_pins: pinmux_pb_spi0_pins {
pinctrl-single,pins = <
/* SPI0_SCLK STATUS:WORKS ??? */
AM33XX_IOPAD(0x0950, PIN_OUTPUT_PULLUP | INPUT_EN | MUX_MODE0 ) /* A13
P1.08 SPI0_SCLK 0x150 GPIO2 GPIO0_2 SCLK */
/* SPI0_DO STATUS:WORKS ??? */
AM33XX_IOPAD(0x0954, PIN_OUTPUT_PULLUP | INPUT_EN | MUX_MODE0 ) /* B13
P1.10 SPI0_D0 0x154 GPIO3 GPIO0_3 MISO */
/* SPI0_D1 STATUS:UNKNOWN */
AM33XX_IOPAD(0x0958, PIN_OUTPUT_PULLUP | INPUT_EN | MUX_MODE7 ) /* B14
P1.12 SPI0_D1 0x158 GPIO4 GPIO0_4 TC1 */
/* SPI0_CS0 STATUS:WORKS ??? */
AM33XX_IOPAD(0x095c, PIN_OUTPUT_PULLUP | INPUT_EN | MUX_MODE0 ) /* A14
P1.06 SPI0_CS 0x15c GPIO5 GPIO0_5 TC0 */
>;
};
};
};
fragment@2 {
target = <&spi0>;
__overlay__ {
#address-cells = <1>;
#size-cells = <0>;
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&pb_spi0_pins>;
ti,pio-mode; /* disable dma when used as an overlay, dma gets stuck at 160
bits... */
channel@0 {
#address-cells = <1>;
#size-cells = <0>;
compatible = "spidev";
reg = <0>;
spi-max-frequency = <4300000>;
spi-cpha;
};
channel@1 {
#address-cells = <1>;
#size-cells = <0>;
compatible = "spidev";
reg = <1>;
spi-max-frequency = <4300000>;
};
};
};
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