On 2016年07月15日 18:58, Mark Brown wrote:
On Fri, Jul 15, 2016 at 10:03:26AM +0800, qiaozhou wrote:
My case is like this: I got a ARM mali-video driver, which may have several
ports/endpoints, which needs I2C/SPI interface to do some initiation. In the
video driver, it uses device node conf to find matching ports, and calls
This sounds like a fairly standard setup, most external HDMI encoders
are I2C and SPI controlled, which already works fine as far as I'm aware.
functions, such as of_find_video_tx_by_node -> of_find_i2c_device_by_node.
Now the hardware changes from i2c to spi, so I wonder whether
of_find_spi_device_by_node can be used freely. Otherwise I may need to
modify the mali-video driver, and as it's provided to us and may get updated
from time to time, my change may be conflicted with future versions.
Also I didn't quite understand the way to "use a phandle to connect the two
devices", is there any code/driver which I can take as a reference? I'll
study it.
Off the top of my head something like the TDA998x or ADV7511 should be
worth looking at here - it just sounds like the the Mali driver may just
not be using the frameworks well, you should probably encourage people
to get it upstreamed.
Got it. I'll check it. Thanks a lot for the suggestions.
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