8 Aug
2016
8 Aug
'16
5:27 a.m.
Hi
On 8/5/2016 8:08 PM, Mark Brown wrote:
On Mon, Jul 04, 2016 at 11:34:19AM +0800, John Hsu wrote:
On 7/1/2016 6:04 PM, Mark Brown wrote:
No, you don't - this is entirely normal for 7x9 regmaps, I've never seen such a device that supported readback. Look at devices like wm8731 for examples.
Sometimes, we need to know the codec information and need read it from hardware, not cache. I'm afraid that it can't be done in this case.
What does the read actually look like on this device?
The data read from codec by the IIC bus is as the following. 0 0 0 0 0 0 0 D8 ACK D7 D6 D5 D4 D3 D2 D1 D0 The bottom 9 bits are the real register value. The nau8810_reg_read in driver is made by the formate.