[MinnowBoard] low-speed-spidev driver with chip select high logic is not able to load using insmod

[Bhoomil Chavda]

Hi,

I didn't find any kind of material related to low-speed-spidev.c driver over Google.

I have one question.


I wanna make my Minnowboard MAX SPI CS pin as active high to support one of my sensor.

For the ultimate solution I use SPI_CS_HIGH from the user space test application.

But on the logic analyzer I didn't see any kind of signal level change.


Now If we look at driver side the low-speed-spidev have user defined macros in the source code.

I was just change the two things and here is the diff for the same.


--------------------------------------------------------------------------------------------------------------------------------------

@@ -25,12 +25,12 @@
         #error SPI_SPIDEV is required.
 #endif

 /* Change these values to what your board uses. */
 #define LOW_SPEED_SPIDEV_SPI_BUS 0
-#define LOW_SPEED_SPIDEV_SPI_CS 0
-#define LOW_SPEED_SPIDEV_MAX_CLK_HZ 1000000
+#define LOW_SPEED_SPIDEV_SPI_CS 1
+#define LOW_SPEED_SPIDEV_MAX_CLK_HZ 10000000

 static struct spi_board_info cal_spi_board_info __initdata = {
  .modalias = "spidev",
  .bus_num = LOW_SPEED_SPIDEV_SPI_BUS,
  .chip_select = LOW_SPEED_SPIDEV_SPI_CS,

--------------------------------------------------------------------------------------------------------------------------------------

By doing this changes , I'm able to  build module but insertion is fail

insmod: ERROR: could not insert module low-speed-spidev.ko: No such device

How to make CS pin as active high in case of Minnowboard MAX. Rightnow I think that should I put NOT gate to invert the logic.

Please help me out here.
Thanks in advance.


Regards,

Bhoomil C.

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