SPI Driver Implementation

[Sebastian Huber]

On 10/02/2021 08:37, Jan.Sommer at dlr.de wrote:
>> Assuming they need to be developed, I looked at the RTEMS 6 BSP and
>> Driver Guide that specifies the use of the "SPI bus framework". However, I
>> have looked at some of the Arm BSPs included with RTEMS and they all seem
>> to use the libi2c library that is part of the cpukit. It claims to support both I2C
>> and SPI.
>>
> I think the preferred way is to use the libi2c API for i2c devices only and use the Linux spidev API for SPI devices.
> In the docs are a few drivers which already implement the spidev API (https://docs.rtems.org/branches/master/bsp-howto/spi.html).
> For the cadence-SPI driver I used the general layout of the NXP i.MX SPI driver linked there and implemented it according to the data sheet from Xilinx.

The libi2c is a legacy interface. New I2C drivers should use:

https://docs.rtems.org/branches/master/bsp-howto/i2c.html

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