spi-config

spi board configuration without having to recompile the kernel, modified for ODROID C1

Compiling

make KDIR=${KERNELSRC} install

Usage:

loading the module:

modprobe spi-config devices=<devicedev1>,<devicedev2>,...,<devicedev16>

and a <devicedev> is defined as a list of : separated key=value pairs

possible keys are:

• modalias = the driver to assign/use (required)
• irq = the irq to assign (optional, default none)
• speed = the maximum speed of the spi bus (optinal, default 2MHz)
• bus = the bus number (required)
• cs = the chip select (required)
• mode = the SPI mode (optional, default mode 0)
• irqgpio = the GPIO pin of the irq (optional, default none)
• irqsource = the irq source (0-7) (optional, default none)
• irqfilter = the irq filter. 0 = no filtering, 1..7 mean 111ns * 3 * x of filtering (optional, default 7)
• irqtype = the irq type. 0: High, 1: Low, 2: Rising, 3: Falling (optional, default 3)
• pd = platform data length to allocate
• pdx- = sets the hex values at byte-offset of the platform data (hex string - 2 chars per byte!!!)
• pdp- = sets a pointer to platform_data+ at byte-offset of the platform data
• pds64- = sets the s64-value at byte-offset of the platform data
• pdu64- = sets the u64-value at byte-offset of the platform data
• pds32- = sets the s32-value at byte-offset of the platform data
• pdu32- = sets the u32-value at byte-offset of the platform data
• pds16- = sets the u16-value at byte-offset of the platform data
• pdu16- = sets the s16-value at byte-offset of the platform data
• pds8- = sets the u8-value at byte-offset of the platform data
• pdu8- = sets the u8-value at byte-offset of the platform data
• force_release = forces a release of a spi device if it has NOT been configured by this module this action taints the kernel!!! Also this is defined without a =.

and can typically get prefixed with 0x for hex and 0 for octal.

So the following:

modprobe spi-config devices=\
bus=0:cs=0:modalias=mcp2515:speed=10000000:irqgpio=GPIOX_6:irqsource=0:irqfilter=0:irqtype=1:pd=20:pdu32-0=16000000:pdu32-4=0x20

will configure:

• on SPI0.0 a mcp251x device with max_speed of 10MHz with IRQ on GPIOX_6 with irq=96, no filter and interrupt on LOW and platform data that reflects: 16MHz crystal and Interrupt flags with IRQF_DISABLED