On Tue, Jul 05, 2016 at 09:52:13AM +0800, Garlic Tseng wrote:
On Mon, 2016-07-04 at 16:44 +0200, Mark Brown wrote:
We really shouldn't be writing the registers or other internal data of the device. Instead we should be getting the driver for the relevant hardware component to do it. If we just write to registers that makes the interoperation with the real driver for the device more fragile than it should be, people might update the main driver without noticing the external driver.
The AUDIO_TOP_CON4 is a reg of the ASoC hw module. All the registers which are set in the btmrg operator belong to ASoC hardware. The reg writing you mention above is to power up the MRG interface in the ASoC module.
The problem is that this is the machine driver, not a driver for the chip that's being controlled.