UART map / multiple uart connections

UART map / multiple uart connections

[Kumar Gala]

Wondering if your aware of any examples of how to describe a modem with multiple UART connections.  Normally we have the “modem” as a child of the UART node.  So that would work for one connection, but not sure how we’d describe a second UART connection.  Some kinda of “uart-map”?

- k

Re: UART map / multiple uart connections

[Rob Herring]

On Thu, Jul 7, 2022 at 11:56 AM Kumar Gala <galak.kernel-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
> Wondering if your aware of any examples of how to describe a modem with multiple UART connections.  Normally we have the “modem” as a child of the UART node.  So that would work for one connection, but not sure how we’d describe a second UART connection.  Some kinda of “uart-map”?

I haven't seen that come up. The closest thing I can think of is USB3
hubs which also have a USB2 connection. Those show up as 2 nodes under
their respective controller with a phandle link to each other. Is
there a primary vs. secondary connection?

Rob

Re: UART map / multiple uart connections

[Kumar Gala]

> On Jul 12, 2022, at 9:33 AM, Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org> wrote:
> 
> On Thu, Jul 7, 2022 at 11:56 AM Kumar Gala <galak.kernel-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>> 
>> Wondering if your aware of any examples of how to describe a modem with multiple UART connections.  Normally we have the “modem” as a child of the UART node.  So that would work for one connection, but not sure how we’d describe a second UART connection.  Some kinda of “uart-map”?
> 
> I haven't seen that come up. The closest thing I can think of is USB3
> hubs which also have a USB2 connection. Those show up as 2 nodes under
> their respective controller with a phandle link to each other. Is
> there a primary vs. secondary connection?
> 
> Rob

Do you have a pointer to the USB example?

I think on of the uart’s could be considered the main connection point.  But not sure it maters.  I’m guessing we need a few standard properties to represent phandles to devices on buses that would normally have the nodes as children.

So i2c, spi, uart, etc.. 

- k

Re: UART map / multiple uart connections

[Kumar Gala]

> On Jul 14, 2022, at 10:58 AM, Kumar Gala <galak-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org> wrote:
> 
> 
> 
>> On Jul 12, 2022, at 9:33 AM, Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org> wrote:
>> 
>> On Thu, Jul 7, 2022 at 11:56 AM Kumar Gala <galak.kernel-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>>> 
>>> Wondering if your aware of any examples of how to describe a modem with multiple UART connections.  Normally we have the “modem” as a child of the UART node.  So that would work for one connection, but not sure how we’d describe a second UART connection.  Some kinda of “uart-map”?
>> 
>> I haven't seen that come up. The closest thing I can think of is USB3
>> hubs which also have a USB2 connection. Those show up as 2 nodes under
>> their respective controller with a phandle link to each other. Is
>> there a primary vs. secondary connection?
>> 
>> Rob
> 
> Do you have a pointer to the USB example?
> 
> I think on of the uart’s could be considered the main connection point.  But not sure it maters.  I’m guessing we need a few standard properties to represent phandles to devices on buses that would normally have the nodes as children.
> 
> So i2c, spi, uart, etc.. 
> 
> - k

Rob, any follow up on this?

- k