On Dienstag, 25. November 2008, ngc@drvlabo.jp wrote:
Now I'm porting WM8728 driver with i.MX27ADS, based on Freescale's BSP kernel(2.6.22) and refering to ALSA SoC git repository.
I'm connecting the WM8728 to the SSI2 controller via SSI-3 signal set. Then, my ADS board has altered: i.MX27 WM8728
SSI3_CLK BCLKIN SSI3_FS LRCIN SSI3_TXDAT DIN TOUT/SSI2_MCLK MCLK
Of course, I added some codes to configure GPIO pins as appropriate into board specific sources.
Then, I'm trying to play sounds via WM8728 and have not hear any sounds yet. I checked SSI-3 signal set with an oscilloscope, no clock signal appears on SSI3_CLK. I tried the various SSI setting, I2S normal, I2S master, asychronous/synchronous, normal mode/network mode, ... But, I can't see clock signal, yet.
I want to know an example setting to act i.MX' SSI as I2S clock master.
Maybe the SPI-DAM-PIN mapping could help you:
SSI1_* pin group is port 4 at the DAM unit SSI2_* pin group is port 5 at the DAM unit SSI3_* pin group is port 6 at the DAM unit SSI4_* pin group is port 3 at the DAM unit
I didn't find this info in the datasheet yet.
Regards, Juergen