astra/am3352-sbc
A 4-layer AM3352 single-board computer with 128‑MiB DDR3, PMIC power regulation, USB‑C 5‑V PD input, dual USB host ports, HDMI output with ESD protection, microSD/UART/JTAG interfaces, addressable RGB indicators, and a PWM-driven buzzer.
- Version
- 0.1.19
- License
- unset
- Stars
- 0
design/PINMUX.md
# Board pinmux integration requirements
USB1_OCn uses U1.V17 (GPMC_A11), mux mode 7, GPIO1_27 input on the 3.3 V VDDSHV3 bank. Its existing 10 kΩ pull-up and TPS2052B active-low fault output are retained. Software must monitor GPIO1_27; the previous GPIO1_20 mapping is superseded.
RGB serial data uses U1.B17 (SPI0_D0), mux mode 0, on VDDSHV6. Configure SPI0 with `ti,pindir-d0-out-d1-in` so D0 is its output; D1/B16 is unused. The Linux McSPI binding explicitly supports this direction swap. No external SPI clock, chip-select, or receive data is connected to the LEDs. This documents hardware integration requirements; a complete bootable board device tree and LED driver are not supplied or validated here.
Sources: TI AM3352 SPRS717L Tables 4-2 and 4-53; https://github.com/torvalds/linux/blob/master/Documentation/devicetree/bindings/spi/omap-spi.yaml
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