On 2016年07月14日 18:11, Mark Brown wrote:
On Thu, Jul 14, 2016 at 09:15:44AM +0800, qiaozhou wrote:
Hi Mark,
Please don't take things off-list unless there is a really strong reason
to do so. Sending things to the list ensures that everyone gets a
chance to read and comment on things.
Add linux-spi@xxxxxxxxxxxxxxx. I missed it. It's indeed helpful.Thanks
for the tips.
I've a question about the two functions, of_find_spi_device/master_by_node.
Can they be moved out of CONFIG_OF_DYNAMIC so that some spi device driver
can use them without CONFIG_OF_DYNAMIC defined? Some vendor provides both
SPI and I2C interfaces, and the I2C driver has of_find_i2c_xx_by_node
function without OF_DYNAMIC limitation. I made a patch for SPI driver, and
don't know whether it's appropriate. Could you help to give some comments?
Why not just use a phandle to connect the two devices?
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 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.
Thanks a lot for the suggestions.
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