? recommended way to implement gain control

[Philippe De Muyter <phdm@xxxxxxx>]

Hi,

I see there's an ongoing discussion about implementing gain control for
imx208.  I have a similar problem (in the sense that the documentation
of V4L2_CID_GAIN does not answer my question).  The IMX264 has only
one gain control, ranging from 0 to 480, but the unit is 'tenth of dB'.
How can I make that clear for a V4L2 client ?

Best regards

Philippe