506 switch (config->chan_nr) { 507 case 8: 508 case 4: 509 /* 510 * Platform is not capable of providing clocks for 511 * multi channel audio 512 */ 513 if (kmb_i2s->master) 514 return -EINVAL; 515 516 write_val = ((config->chan_nr / 2) << TDM_CHANNEL_CONFIG_BIT) | 517 (config->data_width << DATA_WIDTH_CONFIG_BIT) | 518 !MASTER_MODE | TDM_OPERATION; ^^^^^^^^^^^^ MASTER_MODE is BIT(13). It's unclear what this is supposed to be. My best guess is that the ! should just be deleted.
This ! is intentional because it is meant to be Slave mode. Would a better approach be to create another #define for slave mode?
In my opinion, it's better to just leave it out. ORing with zero causes a different static checker warning on my unreleased checks... Is it 0 << 13? I feel like ORing with zero just makes things more confusing.
It is 0<<13, in the event it was previously configured to Master I would need to unset the bit
You are assigning the result to write_val, so there's no memory of what was configured before?