Hi David,
I am writing a AC97 ASoC driver for the MPC5121e SoC from Freescale. This SoC has almost the same PSC (Programmable Serial Controllers) as the MPC5200B, for which there already is an AC97 driver: sound/soc/fsl/mpc5200-ac97.c, so I'd like to extend that one to also support the MPC5121e.
Yes, this seems feasible. It has been done like this for the uart-driver, sadly not for the spi-driver :(
So obviously, it is supposed that the DMA driver somehow gets probed before the PSC driver, but I can't see where this is enforced. AFAIK, the order is fairly random, so it could be the other way
Check arch/powerpc/sysdev/bestcomm/bestcomm.c at the end:
/* If we're not a module, we must make sure everything is setup before */ /* anyone tries to use us ... that's why we use subsys_initcall instead */ /* of module_init. */ subsys_initcall(mpc52xx_bcom_init);
while the mpc5121-driver has simply module_init() here. subsys_initcall() is also often used for I2C host drivers to ensure client drivers can access them early.
1.- I can't test it on a MPC5200B, so therefor I need help.
I can do tests.
Regards,
Wolfram