open-nandra

David Lewin ask me on theFriendly arm forum to check driver and setup for SPI on mini2440 board.

SPI master driver is prepared so just add some platform data and board info for sca3000 and it must work .

If you would like to connect some SPI device on your mini2440 board you need to:

1. update mach-mini2440.c file in arch/arm/mach-s3c2440/ following:

Add s3c2410_spi_info structure with filled entries
(we use standars SPI pins for spi.0 on CON4):

static struct s3c2410_spi_info mini2440_spi0_pdata = {
         .pin_cs = S3C2410_GPG(2),
         .num_cs = 1,
         .bus_num = 0,
         .gpio_setup = &s3c24xx_spi_gpiocfg_bus0_gpe11_12_13,
};

2. add platform data for device:

static struct spi_board_info mini2440_spi_devs[] __initdata = {
         {       /* sca3000 accel */
                 .modalias       = "sca3000_d01",
                 .chip_select    = 0,
                 .max_speed_hz   = 1 * 1000 * 1000,
                 .bus_num        = 0,
         }
};

3. Add &s3c_device_spi0 line to array of structures mini2440_devices[].

4. In function mini2440_init add lines:

s3c_device_spi0.dev.platform_data = &mini2440_spi0_pdata;

spi_register_board_info(mini2440_spi_devs,
                                 ARRAY_SIZE(mini2440_spi_devs));

You have now prepared kernel code for working with SPI accelerometer.
Just enable all drivers you need (SPI, SCA3000, …) and recompile kernel.

If this is little bit hard to understand you can download a ::patch:: for it.

4 Responses to “Friendly arm 2440 and sca3000 accelerometer”